/*
 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javafx.scene.control;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.WeakHashMap;

import com.sun.javafx.logging.PlatformLogger.Level;
import com.sun.javafx.scene.control.Logging;
import com.sun.javafx.scene.control.Properties;
import com.sun.javafx.scene.control.SelectedCellsMap;
import com.sun.javafx.scene.control.SelectedItemsReadOnlyObservableList;
import com.sun.javafx.scene.control.behavior.TableCellBehavior;
import com.sun.javafx.scene.control.behavior.TableCellBehaviorBase;
import javafx.beans.*;
import javafx.beans.Observable;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.beans.property.Property;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.ReadOnlyObjectWrapper;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.MapChangeListener;
import javafx.collections.ObservableList;
import javafx.collections.WeakListChangeListener;
import javafx.collections.transformation.SortedList;
import javafx.css.CssMetaData;
import javafx.css.PseudoClass;
import javafx.css.Styleable;
import javafx.css.StyleableDoubleProperty;
import javafx.css.StyleableProperty;
import javafx.event.EventHandler;
import javafx.event.EventType;
import javafx.scene.AccessibleAttribute;
import javafx.scene.AccessibleRole;
import javafx.scene.Node;
import javafx.scene.layout.Region;
import javafx.util.Callback;

import com.sun.javafx.collections.MappingChange;
import com.sun.javafx.collections.NonIterableChange;
import javafx.css.converter.SizeConverter;
import com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList;
import com.sun.javafx.scene.control.TableColumnComparatorBase.TableColumnComparator;
import javafx.scene.control.skin.TableViewSkin;

The TableView control is designed to visualize an unlimited number of rows of data, broken out into columns. A TableView is therefore very similar to the ListView control, with the addition of support for columns. For an example on how to create a TableView, refer to the 'Creating a TableView' control section below. 
The TableView control has a number of features, including:

Powerful TableColumn API: 

  
Support for cell factories to easily customize cell contents in both rendering and editing states. 
Specification of minWidth/ prefWidth/ maxWidth, and also fixed width columns. 
Width resizing by the user at runtime.
  
Column reordering by the user at runtime.
  
Built-in support for column nesting 
Different resizing policies to dictate what happens when the user resizes columns. 
Support for multiple column sorting by clicking the column header (hold down Shift keyboard key whilst clicking on a header to sort by multiple columns). 
Note that TableView is intended to be used to visualize data - it is not intended to be used for laying out your user interface. If you want to lay your user interface out in a grid-like fashion, consider the GridPane layout instead.
Creating a TableView
 Creating a TableView is a multi-step process, and also depends on the underlying data model needing to be represented. For this example we'll use an ObservableList<Person>, as it is the simplest way of showing data in a TableView. The Person class will consist of a first name and last name properties. That is: 

public class Person {
    private StringProperty firstName;
    public void setFirstName(String value) { firstNameProperty().set(value); }
    public String getFirstName() { return firstNameProperty().get(); }
    public StringProperty firstNameProperty() {
        if (firstName == null) firstName = new SimpleStringProperty(this, "firstName");
        return firstName;
    }
    private StringProperty lastName;
    public void setLastName(String value) { lastNameProperty().set(value); }
    public String getLastName() { return lastNameProperty().get(); }
    public StringProperty lastNameProperty() {
        if (lastName == null) lastName = new SimpleStringProperty(this, "lastName");
        return lastName;
    }
 }
Firstly, a TableView instance needs to be defined, as such:

TableView<Person> table = new TableView<>();
With the basic table defined, we next focus on the data model. As mentioned, for this example, we'll be using an ObservableList<Person>. We can immediately set such a list directly in to the TableView, as such: 

ObservableList<Person> teamMembers = getTeamMembers();
table.setItems(teamMembers);
With the items set as such, TableView will automatically update whenever
the teamMembers list changes. If the items list is available
before the TableView is instantiated, it is possible to pass it directly into
the constructor.
At this point we now have a TableView hooked up to observe the
teamMembers observableList. The missing ingredient now is the means of splitting out the data contained within the model and representing it in one or more TableColumn instances. To create a two-column TableView to show the firstName and lastName properties, we extend the last code sample as follows: 

ObservableList<Person> teamMembers = ...;
table.setItems(teamMembers);
TableColumn<Person,String> firstNameCol = new TableColumn<>("First Name");
firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
TableColumn<Person,String> lastNameCol = new TableColumn<>("Last Name");
lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
table.getColumns().setAll(firstNameCol, lastNameCol);
With the code shown above we have fully defined the minimum properties
required to create a TableView instance. Running this code (assuming the
people ObservableList is appropriately created) will result in a TableView being
shown with two columns for firstName and lastName. Any other properties of the
Person class will not be shown, as no TableColumns are defined.
TableView support for classes that don't contain properties
The code shown above is the shortest possible code for creating a TableView when the domain objects are designed with JavaFX properties in mind (additionally, PropertyValueFactory supports normal JavaBean properties too, although there is a caveat to this, so refer to the class documentation for more information). When this is not the case, it is necessary to provide a custom cell value factory. More information about cell value factories can be found in the TableColumn API documentation, but briefly, here is how a TableColumn could be specified: 

firstNameCol.setCellValueFactory(new Callback<CellDataFeatures<Person, String>, ObservableValue<String>>() {
    public ObservableValue<String> call(CellDataFeatures<Person, String> p) {
        // p.getValue() returns the Person instance for a particular TableView row
        return p.getValue().firstNameProperty();
    }
 });
// or with a lambda expression:
firstNameCol.setCellValueFactory(p -> p.getValue().firstNameProperty());

TableView Selection / Focus APIs
To track selection and focus, it is necessary to become familiar with the SelectionModel and FocusModel classes. A TableView has at most one instance of each of these classes, available from selectionModel and focusModel properties respectively. Whilst it is possible to use this API to set a new selection model, in most circumstances this is not necessary - the default selection and focus models should work in most circumstances. 
The default SelectionModel used when instantiating a TableView is an implementation of the MultipleSelectionModel abstract class. However, as noted in the API documentation for the selectionMode property, the default value is SelectionMode.SINGLE. To enable multiple selection in a default TableView instance, it is therefore necessary to do the following: 

tableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
Customizing TableView Visuals
The visuals of the TableView can be entirely customized by replacing the default row factory. A row factory is used to generate TableRow instances, which are used to represent an entire row in the TableView. 
In many cases, this is not what is desired however, as it is more commonly the case that cells be customized on a per-column basis, not a per-row basis. It is therefore important to note that a TableRow is not a TableCell. A TableRow is simply a container for zero or more TableCell, and in most circumstances it is more likely that you'll want to create custom TableCells, rather than TableRows. The primary use case for creating custom TableRow instances would most probably be to introduce some form of column spanning support. 
You can create custom TableCell instances per column by assigning the appropriate function to the TableColumn cell factory property. 
See the Cell class documentation for a more complete description of how to write custom Cells. 
Sorting
Prior to JavaFX 8.0, the TableView control would treat the items list as the view model, meaning that any changes to the list would be immediately reflected visually. TableView would also modify the order of this list directly when a user initiated a sort. This meant that (again, prior to JavaFX 8.0) it was not possible to have the TableView return to an unsorted state (after iterating through ascending and descending orders).
Starting with JavaFX 8.0 (and the introduction of SortedList), it is now possible to have the collection return to the unsorted state when there are no columns as part of the TableView sort order. To do this, you must create a SortedList instance, and bind its comparator property to the TableView comparator property, list so:

// create a SortedList based on the provided ObservableList
SortedList sortedList = new SortedList(FXCollections.observableArrayList(2, 1, 3));
// create a TableView with the sorted list set as the items it will show
final TableView<Integer> tableView = new TableView<>(sortedList);
// bind the sortedList comparator to the TableView comparator
sortedList.comparatorProperty().bind(tableView.comparatorProperty());
// Don't forget to define columns!

Editing
This control supports inline editing of values, and this section attempts to
give an overview of the available APIs and how you should use them.
Firstly, cell editing most commonly requires a different user interface than when a cell is not being edited. This is the responsibility of the Cell implementation being used. For TableView, it is highly recommended that editing be per-TableColumn, rather than per row, as more often than not you want users to edit each column value differently, and this approach allows for editors specific to each column. It is your choice whether the cell is permanently in an editing state (e.g. this is common for CheckBox cells), or to switch to a different UI when editing begins (e.g. when a double-click is received on a cell).
To know when editing has been requested on a cell, simply override the Cell.startEdit() method, and update the cell text and graphic properties as appropriate (e.g. set the text to null and set the graphic to be a TextField). Additionally, you should also override Cell.cancelEdit() to reset the UI back to its original visual state when the editing concludes. In both cases it is important that you also ensure that you call the super method to have the cell perform all duties it must do to enter or exit its editing mode.
Once your cell is in an editing state, the next thing you are most probably interested in is how to commit or cancel the editing that is taking place. This is your responsibility as the cell factory provider. Your cell implementation will know when the editing is over, based on the user input (e.g. when the user presses the Enter or ESC keys on their keyboard). When this happens, it is your responsibility to call Cell.commitEdit(Object) or Cell.cancelEdit(), as appropriate.
When you call Cell.commitEdit(Object) an event is fired to the TableView, which you can observe by adding an EventHandler via TableColumn.setOnEditCommit(EventHandler). Similarly, you can also observe edit events for edit start and edit cancel.
By default the TableColumn edit commit handler is non-null, with a default handler that attempts to overwrite the property value for the item in the currently-being-edited row. It is able to do this as the Cell.commitEdit(Object) method is passed in the new value, and this is passed along to the edit commit handler via the CellEditEvent that is fired. It is simply a matter of calling CellEditEvent.getNewValue() to retrieve this value. 
It is very important to note that if you call TableColumn.setOnEditCommit(EventHandler) with your own EventHandler, then you will be removing the default handler. Unless you then handle the writeback to the property (or the relevant data source), nothing will happen. You can work around this by using the TableColumnBase.addEventHandler(EventType, EventHandler) method to add a TableColumn.editCommitEvent() EventType with your desired EventHandler as the second argument. Using this method, you will not replace the default implementation, but you will be notified when an edit commit has occurred.
Hopefully this summary answers some of the commonly asked questions.
Fortunately, JavaFX ships with a number of pre-built cell factories that
handle all the editing requirements on your behalf. You can find these
pre-built cell factories in the javafx.scene.control.cell package.
Type parameters:
<S> – The type of the objects contained within the TableView items list.
See Also:
TableColumn
TablePosition
Since:
JavaFX 2.0/**
 * The TableView control is designed to visualize an unlimited number of rows
 * of data, broken out into columns. A TableView is therefore very similar to the
 * {@link ListView} control, with the addition of support for columns. For an
 * example on how to create a TableView, refer to the 'Creating a TableView'
 * control section below.
 *
 * <p>The TableView control has a number of features, including:
 * <ul>
 * <li>Powerful {@link TableColumn} API:
 *   <ul>
 *   <li>Support for {@link TableColumn#cellFactoryProperty() cell factories} to
 *      easily customize {@link Cell cell} contents in both rendering and editing
 *      states.
 *   <li>Specification of {@link TableColumn#minWidthProperty() minWidth}/
 *      {@link TableColumn#prefWidthProperty() prefWidth}/
 *      {@link TableColumn#maxWidthProperty() maxWidth},
 *      and also {@link TableColumn#resizableProperty() fixed width columns}.
 *   <li>Width resizing by the user at runtime.
 *   <li>Column reordering by the user at runtime.
 *   <li>Built-in support for {@link TableColumn#getColumns() column nesting}
 *   </ul>
 * <li>Different {@link #columnResizePolicyProperty() resizing policies} to
 *      dictate what happens when the user resizes columns.
 * <li>Support for {@link #getSortOrder() multiple column sorting} by clicking
 *      the column header (hold down Shift keyboard key whilst clicking on a
 *      header to sort by multiple columns).
 * </ul>
 *
 * <p>Note that TableView is intended to be used to visualize data - it is not
 * intended to be used for laying out your user interface. If you want to lay
 * your user interface out in a grid-like fashion, consider the
 * {@link javafx.scene.layout.GridPane} layout instead.</p>
 *
 * <h2>Creating a TableView</h2>
 *
 * <p>
 * Creating a TableView is a multi-step process, and also depends on the
 * underlying data model needing to be represented. For this example we'll use
 * an {@literal ObservableList<Person>}, as it is the simplest way of showing data in a
 * TableView. The {@code Person} class will consist of a first
 * name and last name properties. That is:
 *
 * <pre>
 * {@code
 * public class Person {
 *     private StringProperty firstName;
 *     public void setFirstName(String value) { firstNameProperty().set(value); }
 *     public String getFirstName() { return firstNameProperty().get(); }
 *     public StringProperty firstNameProperty() {
 *         if (firstName == null) firstName = new SimpleStringProperty(this, "firstName");
 *         return firstName;
 *     }
 *
 *     private StringProperty lastName;
 *     public void setLastName(String value) { lastNameProperty().set(value); }
 *     public String getLastName() { return lastNameProperty().get(); }
 *     public StringProperty lastNameProperty() {
 *         if (lastName == null) lastName = new SimpleStringProperty(this, "lastName");
 *         return lastName;
 *     }
 * }}</pre>
 *
 * <p>Firstly, a TableView instance needs to be defined, as such:
 *
 * <pre>
 * {@code
 * TableView<Person> table = new TableView<>();}</pre>
 *
 * <p>With the basic table defined, we next focus on the data model. As mentioned,
 * for this example, we'll be using an {@literal ObservableList<Person>}. We can immediately
 * set such a list directly in to the TableView, as such:
 *
 * <pre>
 * {@code
 * ObservableList<Person> teamMembers = getTeamMembers();
 * table.setItems(teamMembers);}</pre>
 *
 * <p>With the items set as such, TableView will automatically update whenever
 * the <code>teamMembers</code> list changes. If the items list is available
 * before the TableView is instantiated, it is possible to pass it directly into
 * the constructor.
 *
 * <p>At this point we now have a TableView hooked up to observe the
 * <code>teamMembers</code> observableList. The missing ingredient
 * now is the means of splitting out the data contained within the model and
 * representing it in one or more {@link TableColumn TableColumn} instances. To
 * create a two-column TableView to show the firstName and lastName properties,
 * we extend the last code sample as follows:
 *
 * <pre>
 * {@code
 * ObservableList<Person> teamMembers = ...;
 * table.setItems(teamMembers);
 *
 * TableColumn<Person,String> firstNameCol = new TableColumn<>("First Name");
 * firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
 * TableColumn<Person,String> lastNameCol = new TableColumn<>("Last Name");
 * lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
 *
 * table.getColumns().setAll(firstNameCol, lastNameCol);}</pre>
 *
 * <p>With the code shown above we have fully defined the minimum properties
 * required to create a TableView instance. Running this code (assuming the
 * people ObservableList is appropriately created) will result in a TableView being
 * shown with two columns for firstName and lastName. Any other properties of the
 * Person class will not be shown, as no TableColumns are defined.
 *
 * <h3>TableView support for classes that don't contain properties</h3>
 *
 * <p>The code shown above is the shortest possible code for creating a TableView
 * when the domain objects are designed with JavaFX properties in mind
 * (additionally, {@link javafx.scene.control.cell.PropertyValueFactory} supports
 * normal JavaBean properties too, although there is a caveat to this, so refer
 * to the class documentation for more information). When this is not the case,
 * it is necessary to provide a custom cell value factory. More information
 * about cell value factories can be found in the {@link TableColumn} API
 * documentation, but briefly, here is how a TableColumn could be specified:
 *
 * <pre>
 * {@code
 * firstNameCol.setCellValueFactory(new Callback<CellDataFeatures<Person, String>, ObservableValue<String>>() {
 *     public ObservableValue<String> call(CellDataFeatures<Person, String> p) {
 *         // p.getValue() returns the Person instance for a particular TableView row
 *         return p.getValue().firstNameProperty();
 *     }
 * });
 *
 * // or with a lambda expression:
 * firstNameCol.setCellValueFactory(p -> p.getValue().firstNameProperty());
 * }</pre>
 *
 * <h3>TableView Selection / Focus APIs</h3>
 * <p>To track selection and focus, it is necessary to become familiar with the
 * {@link SelectionModel} and {@link FocusModel} classes. A TableView has at most
 * one instance of each of these classes, available from
 * {@link #selectionModelProperty() selectionModel} and
 * {@link #focusModelProperty() focusModel} properties respectively.
 * Whilst it is possible to use this API to set a new selection model, in
 * most circumstances this is not necessary - the default selection and focus
 * models should work in most circumstances.
 *
 * <p>The default {@link SelectionModel} used when instantiating a TableView is
 * an implementation of the {@link MultipleSelectionModel} abstract class.
 * However, as noted in the API documentation for
 * the {@link MultipleSelectionModel#selectionModeProperty() selectionMode}
 * property, the default value is {@link SelectionMode#SINGLE}. To enable
 * multiple selection in a default TableView instance, it is therefore necessary
 * to do the following:
 *
 * <pre>
 * {@code
 * tableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);}</pre>
 *
 * <h3>Customizing TableView Visuals</h3>
 * <p>The visuals of the TableView can be entirely customized by replacing the
 * default {@link #rowFactoryProperty() row factory}. A row factory is used to
 * generate {@link TableRow} instances, which are used to represent an entire
 * row in the TableView.
 *
 * <p>In many cases, this is not what is desired however, as it is more commonly
 * the case that cells be customized on a per-column basis, not a per-row basis.
 * It is therefore important to note that a {@link TableRow} is not a
 * {@link TableCell}. A  {@link TableRow} is simply a container for zero or more
 * {@link TableCell}, and in most circumstances it is more likely that you'll
 * want to create custom TableCells, rather than TableRows. The primary use case
 * for creating custom TableRow instances would most probably be to introduce
 * some form of column spanning support.
 *
 * <p>You can create custom {@link TableCell} instances per column by assigning
 * the appropriate function to the TableColumn
 * {@link TableColumn#cellFactoryProperty() cell factory} property.
 *
 * <p>See the {@link Cell} class documentation for a more complete
 * description of how to write custom Cells.
 *
 * <h3>Sorting</h3>
 * <p>Prior to JavaFX 8.0, the TableView control would treat the
 * {@link #getItems() items} list as the view model, meaning that any changes to
 * the list would be immediately reflected visually. TableView would also modify
 * the order of this list directly when a user initiated a sort. This meant that
 * (again, prior to JavaFX 8.0) it was not possible to have the TableView return
 * to an unsorted state (after iterating through ascending and descending
 * orders).</p>
 *
 * <p>Starting with JavaFX 8.0 (and the introduction of {@link SortedList}), it
 * is now possible to have the collection return to the unsorted state when
 * there are no columns as part of the TableView
 * {@link #getSortOrder() sort order}. To do this, you must create a SortedList
 * instance, and bind its
 * {@link javafx.collections.transformation.SortedList#comparatorProperty() comparator}
 * property to the TableView {@link #comparatorProperty() comparator} property,
 * list so:</p>
 *
 * <pre>
 * {@code
 * // create a SortedList based on the provided ObservableList
 * SortedList sortedList = new SortedList(FXCollections.observableArrayList(2, 1, 3));
 *
 * // create a TableView with the sorted list set as the items it will show
 * final TableView<Integer> tableView = new TableView<>(sortedList);
 *
 * // bind the sortedList comparator to the TableView comparator
 * sortedList.comparatorProperty().bind(tableView.comparatorProperty());
 *
 * // Don't forget to define columns!
 * }</pre>
 *
 * <h3>Editing</h3>
 * <p>This control supports inline editing of values, and this section attempts to
 * give an overview of the available APIs and how you should use them.</p>
 *
 * <p>Firstly, cell editing most commonly requires a different user interface
 * than when a cell is not being edited. This is the responsibility of the
 * {@link Cell} implementation being used. For TableView, it is highly
 * recommended that editing be
 * {@link javafx.scene.control.TableColumn#cellFactoryProperty() per-TableColumn},
 * rather than {@link #rowFactoryProperty() per row}, as more often than not
 * you want users to edit each column value differently, and this approach allows
 * for editors specific to each column. It is your choice whether the cell is
 * permanently in an editing state (e.g. this is common for {@link CheckBox} cells),
 * or to switch to a different UI when editing begins (e.g. when a double-click
 * is received on a cell).</p>
 *
 * <p>To know when editing has been requested on a cell,
 * simply override the {@link javafx.scene.control.Cell#startEdit()} method, and
 * update the cell {@link javafx.scene.control.Cell#textProperty() text} and
 * {@link javafx.scene.control.Cell#graphicProperty() graphic} properties as
 * appropriate (e.g. set the text to null and set the graphic to be a
 * {@link TextField}). Additionally, you should also override
 * {@link Cell#cancelEdit()} to reset the UI back to its original visual state
 * when the editing concludes. In both cases it is important that you also
 * ensure that you call the super method to have the cell perform all duties it
 * must do to enter or exit its editing mode.</p>
 *
 * <p>Once your cell is in an editing state, the next thing you are most probably
 * interested in is how to commit or cancel the editing that is taking place. This is your
 * responsibility as the cell factory provider. Your cell implementation will know
 * when the editing is over, based on the user input (e.g. when the user presses
 * the Enter or ESC keys on their keyboard). When this happens, it is your
 * responsibility to call {@link Cell#commitEdit(Object)} or
 * {@link Cell#cancelEdit()}, as appropriate.</p>
 *
 * <p>When you call {@link Cell#commitEdit(Object)} an event is fired to the
 * TableView, which you can observe by adding an {@link EventHandler} via
 * {@link TableColumn#setOnEditCommit(javafx.event.EventHandler)}. Similarly,
 * you can also observe edit events for
 * {@link TableColumn#setOnEditStart(javafx.event.EventHandler) edit start}
 * and {@link TableColumn#setOnEditCancel(javafx.event.EventHandler) edit cancel}.</p>
 *
 * <p>By default the TableColumn edit commit handler is non-null, with a default
 * handler that attempts to overwrite the property value for the
 * item in the currently-being-edited row. It is able to do this as the
 * {@link Cell#commitEdit(Object)} method is passed in the new value, and this
 * is passed along to the edit commit handler via the
 * {@link javafx.scene.control.TableColumn.CellEditEvent CellEditEvent} that is
 * fired. It is simply a matter of calling
 * {@link javafx.scene.control.TableColumn.CellEditEvent#getNewValue()} to
 * retrieve this value.
 *
 * <p>It is very important to note that if you call
 * {@link TableColumn#setOnEditCommit(javafx.event.EventHandler)} with your own
 * {@link EventHandler}, then you will be removing the default handler. Unless
 * you then handle the writeback to the property (or the relevant data source),
 * nothing will happen. You can work around this by using the
 * {@link TableColumn#addEventHandler(javafx.event.EventType, javafx.event.EventHandler)}
 * method to add a {@link TableColumn#editCommitEvent()} {@link EventType} with
 * your desired {@link EventHandler} as the second argument. Using this method,
 * you will not replace the default implementation, but you will be notified when
 * an edit commit has occurred.</p>
 *
 * <p>Hopefully this summary answers some of the commonly asked questions.
 * Fortunately, JavaFX ships with a number of pre-built cell factories that
 * handle all the editing requirements on your behalf. You can find these
 * pre-built cell factories in the javafx.scene.control.cell package.</p>
 *
 * @see TableColumn
 * @see TablePosition
 * @param <S> The type of the objects contained within the TableView items list.
 * @since JavaFX 2.0
 */
@DefaultProperty("items")
public class TableView<S> extends Control {

    
                                                                        *
Static properties and methods                                           *
                                                                        *
/***************************************************************************
     *                                                                         *
     * Static properties and methods                                           *
     *                                                                         *
     **************************************************************************/

    // strings used to communicate via the TableView properties map between
    // the control and the skin. Because they are private here, the strings
    // are also duplicated in the TableViewSkin class - so any changes to these
    // strings must also be duplicated there
    static final String SET_CONTENT_WIDTH = "TableView.contentWidth";

    
Very simple resize policy that just resizes the specified column by the
provided delta and shifts all other columns (to the right of the given column)
further to the right (when the delta is positive) or to the left (when the
delta is negative).
It also handles the case where we have nested columns by sharing the new space,
or subtracting the removed space, evenly between all immediate children columns.
Of course, the immediate children may themselves be nested, and they would
then use this policy on their children.
/**
     * <p>Very simple resize policy that just resizes the specified column by the
     * provided delta and shifts all other columns (to the right of the given column)
     * further to the right (when the delta is positive) or to the left (when the
     * delta is negative).
     *
     * <p>It also handles the case where we have nested columns by sharing the new space,
     * or subtracting the removed space, evenly between all immediate children columns.
     * Of course, the immediate children may themselves be nested, and they would
     * then use this policy on their children.
     */
    public static final Callback<ResizeFeatures, Boolean> UNCONSTRAINED_RESIZE_POLICY = new Callback<ResizeFeatures, Boolean>() {
        @Override public String toString() {
            return "unconstrained-resize";
        }

        @Override public Boolean call(ResizeFeatures prop) {
            double result = TableUtil.resize(prop.getColumn(), prop.getDelta());
            return Double.compare(result, 0.0) == 0;
        }
    };

    
Simple policy that ensures the width of all visible leaf columns in
this table sum up to equal the width of the table itself.
When the user resizes a column width with this policy, the table automatically
adjusts the width of the right hand side columns. When the user increases a
column width, the table decreases the width of the rightmost column until it
reaches its minimum width. Then it decreases the width of the second
rightmost column until it reaches minimum width and so on. When all right
hand side columns reach minimum size, the user cannot increase the size of
resized column any more.
/**
     * <p>Simple policy that ensures the width of all visible leaf columns in
     * this table sum up to equal the width of the table itself.
     *
     * <p>When the user resizes a column width with this policy, the table automatically
     * adjusts the width of the right hand side columns. When the user increases a
     * column width, the table decreases the width of the rightmost column until it
     * reaches its minimum width. Then it decreases the width of the second
     * rightmost column until it reaches minimum width and so on. When all right
     * hand side columns reach minimum size, the user cannot increase the size of
     * resized column any more.
     */
    public static final Callback<ResizeFeatures, Boolean> CONSTRAINED_RESIZE_POLICY = new Callback<ResizeFeatures, Boolean>() {

        private boolean isFirstRun = true;

        @Override public String toString() {
            return "constrained-resize";
        }

        @Override public Boolean call(ResizeFeatures prop) {
            TableView<?> table = prop.getTable();
            List<? extends TableColumnBase<?,?>> visibleLeafColumns = table.getVisibleLeafColumns();
            Boolean result = TableUtil.constrainedResize(prop,
                                               isFirstRun,
                                               table.contentWidth,
                                               visibleLeafColumns);
            isFirstRun = ! isFirstRun ? false : ! result;
            return result;
        }
    };

    
The default sort policy that this TableView will use if no other policy is specified. The sort policy is a simple Callback that accepts a TableView as the sole argument and expects a Boolean response representing whether the sort succeeded or not. A Boolean response of true represents success, and a response of false (or null) will be considered to represent failure. 
Since:
JavaFX 8.0/**
     * The default {@link #sortPolicyProperty() sort policy} that this TableView
     * will use if no other policy is specified. The sort policy is a simple
     * {@link Callback} that accepts a TableView as the sole argument and expects
     * a Boolean response representing whether the sort succeeded or not. A Boolean
     * response of true represents success, and a response of false (or null) will
     * be considered to represent failure.
     * @since JavaFX 8.0
     */
    public static final Callback<TableView, Boolean> DEFAULT_SORT_POLICY = new Callback<TableView, Boolean>() {
        @Override public Boolean call(TableView table) {
            try {
                ObservableList<?> itemsList = table.getItems();
                if (itemsList instanceof SortedList) {
                    // it is the responsibility of the SortedList to bind to the
                    // comparator provided by the TableView. However, we don't
                    // want to fail the sort (which would put the UI in an
                    // inconsistent state), so we return true here, but only if
                    // the SortedList has its comparator bound to the TableView
                    // comparator property.
                    SortedList sortedList = (SortedList) itemsList;
                    boolean comparatorsBound = sortedList.comparatorProperty().
                            isEqualTo(table.comparatorProperty()).get();

                    if (! comparatorsBound) {
                        // this isn't a good situation to be in, so lets log it
                        // out in case the developer is unaware
                        if (Logging.getControlsLogger().isLoggable(Level.INFO)) {
                            String s = "TableView items list is a SortedList, but the SortedList " +
                                    "comparator should be bound to the TableView comparator for " +
                                    "sorting to be enabled (e.g. " +
                                    "sortedList.comparatorProperty().bind(tableView.comparatorProperty());).";
                            Logging.getControlsLogger().info(s);
                        }
                    }
                    return comparatorsBound;
                } else {
                    if (itemsList == null || itemsList.isEmpty()) {
                        // sorting is not supported on null or empty lists
                        return true;
                    }

                    Comparator comparator = table.getComparator();
                    if (comparator == null) {
                        return true;
                    }

                    // otherwise we attempt to do a manual sort, and if successful
                    // we return true
                    FXCollections.sort(itemsList, comparator);
                    return true;
                }
            } catch (UnsupportedOperationException e) {
                // TODO might need to support other exception types including:
                // ClassCastException - if the class of the specified element prevents it from being added to this list
                // NullPointerException - if the specified element is null and this list does not permit null elements
                // IllegalArgumentException - if some property of this element prevents it from being added to this list

                // If we are here the list does not support sorting, so we gracefully
                // fail the sort request and ensure the UI is put back to its previous
                // state. This is handled in the code that calls the sort policy.

                return false;
            }
        }
    };



    /***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/

    
Creates a default TableView control with no content.
Refer to the TableView class documentation for details on the default state of other properties. /**
     * Creates a default TableView control with no content.
     *
     * <p>Refer to the {@link TableView} class documentation for details on the
     * default state of other properties.
     */
    public TableView() {
        this(FXCollections.<S>observableArrayList());
    }

    
Creates a TableView with the content provided in the items ObservableList.
This also sets up an observer such that any changes to the items list
will be immediately reflected in the TableView itself.
Refer to the TableView class documentation for details on the default state of other properties. 
Params:
items – The items to insert into the TableView, and the list to watch
         for changes (to automatically show in the TableView)./**
     * Creates a TableView with the content provided in the items ObservableList.
     * This also sets up an observer such that any changes to the items list
     * will be immediately reflected in the TableView itself.
     *
     * <p>Refer to the {@link TableView} class documentation for details on the
     * default state of other properties.
     *
     * @param items The items to insert into the TableView, and the list to watch
     *          for changes (to automatically show in the TableView).
     */
    public TableView(ObservableList<S> items) {
        getStyleClass().setAll(DEFAULT_STYLE_CLASS);
        setAccessibleRole(AccessibleRole.TABLE_VIEW);

        // we quite happily accept items to be null here
        setItems(items);

        // install default selection and focus models
        // it's unlikely this will be changed by many users.
        setSelectionModel(new TableViewArrayListSelectionModel<S>(this));
        setFocusModel(new TableViewFocusModel<S>(this));

        // we watch the columns list, such that when it changes we can update
        // the leaf columns and visible leaf columns lists (which are read-only).
        getColumns().addListener(weakColumnsObserver);

        // watch for changes to the sort order list - and when it changes run
        // the sort method.
        getSortOrder().addListener((ListChangeListener<TableColumn<S, ?>>) c -> {
            doSort(TableUtil.SortEventType.SORT_ORDER_CHANGE, c);
        });

        // We're watching for changes to the content width such
        // that the resize policy can be run if necessary. This comes from
        // TreeViewSkin.
        getProperties().addListener(new MapChangeListener<Object, Object>() {
            @Override
            public void onChanged(Change<? extends Object, ? extends Object> c) {
                if (c.wasAdded() && SET_CONTENT_WIDTH.equals(c.getKey())) {
                    if (c.getValueAdded() instanceof Number) {
                        setContentWidth((Double) c.getValueAdded());
                    }
                    getProperties().remove(SET_CONTENT_WIDTH);
                }
            }
        });

        isInited = true;
    }



    
                                                                        *
Instance Variables                                                      *
                                                                        *
/***************************************************************************
     *                                                                         *
     * Instance Variables                                                      *
     *                                                                         *
     **************************************************************************/

    // this is the only publicly writable list for columns. This represents the
    // columns as they are given initially by the developer.
    private final ObservableList<TableColumn<S,?>> columns = FXCollections.observableArrayList();

    // Finally, as convenience, we also have an observable list that contains
    // only the leaf columns that are currently visible.
    private final ObservableList<TableColumn<S,?>> visibleLeafColumns = FXCollections.observableArrayList();
    private final ObservableList<TableColumn<S,?>> unmodifiableVisibleLeafColumns = FXCollections.unmodifiableObservableList(visibleLeafColumns);


    // Allows for multiple column sorting based on the order of the TableColumns
    // in this observableArrayList. Each TableColumn is responsible for whether it is
    // sorted using ascending or descending order.
    private ObservableList<TableColumn<S,?>> sortOrder = FXCollections.observableArrayList();

    // width of VirtualFlow minus the vbar width
    private double contentWidth;

    // Used to minimise the amount of work performed prior to the table being
    // completely initialised. In particular it reduces the amount of column
    // resize operations that occur, which slightly improves startup time.
    private boolean isInited = false;



    
                                                                        *
Callbacks and Events                                                    *
                                                                        *
/***************************************************************************
     *                                                                         *
     * Callbacks and Events                                                    *
     *                                                                         *
     **************************************************************************/

    private final ListChangeListener<TableColumn<S,?>> columnsObserver = new ListChangeListener<TableColumn<S,?>>() {
        @Override public void onChanged(Change<? extends TableColumn<S,?>> c) {
            final List<TableColumn<S,?>> columns = getColumns();

            // Fix for RT-39822 - don't allow the same column to be installed twice
            while (c.next()) {
                if (c.wasAdded()) {
                    List<TableColumn<S,?>> duplicates = new ArrayList<>();
                    for (TableColumn<S,?> addedColumn : c.getAddedSubList()) {
                        if (addedColumn == null) continue;

                        int count = 0;
                        for (TableColumn<S,?> column : columns) {
                            if (addedColumn == column) {
                                count++;
                            }
                        }

                        if (count > 1) {
                            duplicates.add(addedColumn);
                        }
                    }

                    if (!duplicates.isEmpty()) {
                        String titleList = "";
                        for (TableColumn<S,?> dupe : duplicates) {
                            titleList += "'" + dupe.getText() + "', ";
                        }
                        throw new IllegalStateException("Duplicate TableColumns detected in TableView columns list with titles " + titleList);
                    }
                }
            }
            c.reset();

            // Fix for RT-15194: Need to remove removed columns from the
            // sortOrder list.
            List<TableColumn<S,?>> toRemove = new ArrayList<>();
            while (c.next()) {
                final List<? extends TableColumn<S, ?>> removed = c.getRemoved();
                final List<? extends TableColumn<S, ?>> added = c.getAddedSubList();

                if (c.wasRemoved()) {
                    toRemove.addAll(removed);
                    for (TableColumn<S,?> tc : removed) {
                        tc.setTableView(null);
                    }
                }

                if (c.wasAdded()) {
                    toRemove.removeAll(added);
                    for (TableColumn<S,?> tc : added) {
                        tc.setTableView(TableView.this);
                    }
                }

                // set up listeners
                TableUtil.removeColumnsListener(removed, weakColumnsObserver);
                TableUtil.addColumnsListener(added, weakColumnsObserver);

                TableUtil.removeTableColumnListener(c.getRemoved(),
                        weakColumnVisibleObserver,
                        weakColumnSortableObserver,
                        weakColumnSortTypeObserver,
                        weakColumnComparatorObserver);
                TableUtil.addTableColumnListener(c.getAddedSubList(),
                        weakColumnVisibleObserver,
                        weakColumnSortableObserver,
                        weakColumnSortTypeObserver,
                        weakColumnComparatorObserver);
            }

            // We don't maintain a bind for leafColumns, we simply call this update
            // function behind the scenes in the appropriate places.
            updateVisibleLeafColumns();

            sortOrder.removeAll(toRemove);

            // Fix for RT-38892.
            final TableViewFocusModel<S> fm = getFocusModel();
            final TableViewSelectionModel<S> sm = getSelectionModel();
            c.reset();

            // we need to collect together all removed and all added columns, because
            // the code below works on the actually removed columns. If we perform
            // the code within this while loop, we'll be deselecting columns that
            // should be deselected (because they have just moved place, for example).
            List<TableColumn<S,?>> removed = new ArrayList<>();
            List<TableColumn<S,?>> added = new ArrayList<>();
            while (c.next()) {
                if (c.wasRemoved()) {
                    removed.addAll(c.getRemoved());
                }
                if (c.wasAdded()) {
                    added.addAll(c.getAddedSubList());
                }
            }
            removed.removeAll(added);

            // Fix for focus - we simply move focus to a cell to the left
            // of the focused cell if the focused cell was located within
            // a column that has been removed.
            if (fm != null) {
                TablePosition<S, ?> focusedCell = fm.getFocusedCell();
                boolean match = false;
                for (TableColumn<S, ?> tc : removed) {
                    match = focusedCell != null && focusedCell.getTableColumn() == tc;
                    if (match) {
                        break;
                    }
                }

                if (match) {
                    int matchingColumnIndex = lastKnownColumnIndex.getOrDefault(focusedCell.getTableColumn(), 0);
                    int newFocusColumnIndex =
                            matchingColumnIndex == 0 ? 0 :
                            Math.min(getVisibleLeafColumns().size() - 1, matchingColumnIndex - 1);
                    fm.focus(focusedCell.getRow(), getVisibleLeafColumn(newFocusColumnIndex));
                }
            }

            // Fix for selection - we remove selection from all cells that
            // were within the removed column.
            if (sm != null) {
                List<TablePosition> selectedCells = new ArrayList<>(sm.getSelectedCells());
                for (TablePosition selectedCell : selectedCells) {
                    boolean match = false;
                    for (TableColumn<S, ?> tc : removed) {
                        match = selectedCell != null && selectedCell.getTableColumn() == tc;
                        if (match) break;
                    }

                    if (match) {
                        // we can't just use the selectedCell.getTableColumn(), as that
                        // column no longer exists and therefore its index is not correct.
                        int matchingColumnIndex = lastKnownColumnIndex.getOrDefault(selectedCell.getTableColumn(), -1);
                        if (matchingColumnIndex == -1) continue;

                        if (sm instanceof TableViewArrayListSelectionModel) {
                            // Also, because the table column no longer exists in the columns
                            // list at this point, we can't just call:
                            // sm.clearSelection(selectedCell.getRow(), selectedCell.getTableColumn());
                            // as the tableColumn would map to an index of -1, which means that
                            // selection will not be cleared. Instead, we have to create
                            // a new TablePosition with a fixed column index and use that.
                            TablePosition<S,?> fixedTablePosition =
                                    new TablePosition<>(TableView.this,
                                            selectedCell.getRow(),
                                            selectedCell.getTableColumn());
                            fixedTablePosition.fixedColumnIndex = matchingColumnIndex;

                            ((TableViewArrayListSelectionModel)sm).clearSelection(fixedTablePosition);
                        } else {
                            sm.clearSelection(selectedCell.getRow(), selectedCell.getTableColumn());
                        }
                    }
                }
            }


            // update the lastKnownColumnIndex map
            lastKnownColumnIndex.clear();
            for (TableColumn<S,?> tc : getColumns()) {
                int index = getVisibleLeafIndex(tc);
                if (index > -1) {
                    lastKnownColumnIndex.put(tc, index);
                }
            }
        }
    };

    private final WeakHashMap<TableColumn<S,?>, Integer> lastKnownColumnIndex = new WeakHashMap<>();

    private final InvalidationListener columnVisibleObserver = valueModel -> {
        updateVisibleLeafColumns();
    };

    private final InvalidationListener columnSortableObserver = valueModel -> {
        Object col = ((Property<?>)valueModel).getBean();
        if (! getSortOrder().contains(col)) return;
        doSort(TableUtil.SortEventType.COLUMN_SORTABLE_CHANGE, col);
    };

    private final InvalidationListener columnSortTypeObserver = valueModel -> {
        Object col = ((Property<?>)valueModel).getBean();
        if (! getSortOrder().contains(col)) return;
        doSort(TableUtil.SortEventType.COLUMN_SORT_TYPE_CHANGE, col);
    };

    private final InvalidationListener columnComparatorObserver = valueModel -> {
        Object col = ((Property<?>)valueModel).getBean();
        if (! getSortOrder().contains(col)) return;
        doSort(TableUtil.SortEventType.COLUMN_COMPARATOR_CHANGE, col);
    };

    /* proxy pseudo-class state change from selectionModel's cellSelectionEnabledProperty */
    private final InvalidationListener cellSelectionModelInvalidationListener = o -> {
        final boolean isCellSelection = ((BooleanProperty)o).get();
        pseudoClassStateChanged(PSEUDO_CLASS_CELL_SELECTION,  isCellSelection);
        pseudoClassStateChanged(PSEUDO_CLASS_ROW_SELECTION,  !isCellSelection);
    };


    private final WeakInvalidationListener weakColumnVisibleObserver =
            new WeakInvalidationListener(columnVisibleObserver);

    private final WeakInvalidationListener weakColumnSortableObserver =
            new WeakInvalidationListener(columnSortableObserver);

    private final WeakInvalidationListener weakColumnSortTypeObserver =
            new WeakInvalidationListener(columnSortTypeObserver);

    private final WeakInvalidationListener weakColumnComparatorObserver =
            new WeakInvalidationListener(columnComparatorObserver);

    private final WeakListChangeListener<TableColumn<S,?>> weakColumnsObserver =
            new WeakListChangeListener<TableColumn<S,?>>(columnsObserver);

    private final WeakInvalidationListener weakCellSelectionModelInvalidationListener =
            new WeakInvalidationListener(cellSelectionModelInvalidationListener);



    /***************************************************************************
     *                                                                         *
     * Properties                                                              *
     *                                                                         *
     **************************************************************************/


    // --- Items
    
The underlying data model for the TableView. Note that it has a generic
type that must match the type of the TableView itself.
Returns:
the items property/**
     * The underlying data model for the TableView. Note that it has a generic
     * type that must match the type of the TableView itself.
     * @return the items property
     */
    public final ObjectProperty<ObservableList<S>> itemsProperty() { return items; }
    private ObjectProperty<ObservableList<S>> items =
        new SimpleObjectProperty<ObservableList<S>>(this, "items") {
            WeakReference<ObservableList<S>> oldItemsRef;

            @Override protected void invalidated() {
                final ObservableList<S> oldItems = oldItemsRef == null ? null : oldItemsRef.get();
                final ObservableList<S> newItems = getItems();

                // Fix for RT-36425
                if (newItems != null && newItems == oldItems) {
                    return;
                }

                // Fix for RT-35763
                if (! (newItems instanceof SortedList)) {
                    getSortOrder().clear();
                }

                oldItemsRef = new WeakReference<>(newItems);
            }
        };
    public final void setItems(ObservableList<S> value) { itemsProperty().set(value); }
    public final ObservableList<S> getItems() {return items.get(); }


    // --- Table menu button visible
    private BooleanProperty tableMenuButtonVisible;
    
This controls whether a menu button is available when the user clicks
in a designated space within the TableView, within which is a radio menu
item for each TableColumn in this table. This menu allows for the user to
show and hide all TableColumns easily.
Returns:
the tableMenuButtonVisible property/**
     * This controls whether a menu button is available when the user clicks
     * in a designated space within the TableView, within which is a radio menu
     * item for each TableColumn in this table. This menu allows for the user to
     * show and hide all TableColumns easily.
     * @return the tableMenuButtonVisible property
     */
    public final BooleanProperty tableMenuButtonVisibleProperty() {
        if (tableMenuButtonVisible == null) {
            tableMenuButtonVisible = new SimpleBooleanProperty(this, "tableMenuButtonVisible");
        }
        return tableMenuButtonVisible;
    }
    public final void setTableMenuButtonVisible (boolean value) {
        tableMenuButtonVisibleProperty().set(value);
    }
    public final boolean isTableMenuButtonVisible() {
        return tableMenuButtonVisible == null ? false : tableMenuButtonVisible.get();
    }


    // --- Column Resize Policy
    private ObjectProperty<Callback<ResizeFeatures, Boolean>> columnResizePolicy;
    public final void setColumnResizePolicy(Callback<ResizeFeatures, Boolean> callback) {
        columnResizePolicyProperty().set(callback);
    }
    public final Callback<ResizeFeatures, Boolean> getColumnResizePolicy() {
        return columnResizePolicy == null ? UNCONSTRAINED_RESIZE_POLICY : columnResizePolicy.get();
    }

    
This is the function called when the user completes a column-resize operation. The two most common policies are available as static functions in the TableView class: TableView<S>.UNCONSTRAINED_RESIZE_POLICY and TableView<S>.CONSTRAINED_RESIZE_POLICY. 
Returns:
columnResizePolicy property/**
     * This is the function called when the user completes a column-resize
     * operation. The two most common policies are available as static functions
     * in the TableView class: {@link #UNCONSTRAINED_RESIZE_POLICY} and
     * {@link #CONSTRAINED_RESIZE_POLICY}.
     * @return columnResizePolicy property
     */
    public final ObjectProperty<Callback<ResizeFeatures, Boolean>> columnResizePolicyProperty() {
        if (columnResizePolicy == null) {
            columnResizePolicy = new SimpleObjectProperty<Callback<ResizeFeatures, Boolean>>(this, "columnResizePolicy", UNCONSTRAINED_RESIZE_POLICY) {
                private Callback<ResizeFeatures, Boolean> oldPolicy;

                @Override protected void invalidated() {
                    if (isInited) {
                        get().call(new ResizeFeatures(TableView.this, null, 0.0));

                        if (oldPolicy != null) {
                            PseudoClass state = PseudoClass.getPseudoClass(oldPolicy.toString());
                            pseudoClassStateChanged(state, false);
                        }
                        if (get() != null) {
                            PseudoClass state = PseudoClass.getPseudoClass(get().toString());
                            pseudoClassStateChanged(state, true);
                        }
                        oldPolicy = get();
                    }
                }
            };
        }
        return columnResizePolicy;
    }


    // --- Row Factory
    private ObjectProperty<Callback<TableView<S>, TableRow<S>>> rowFactory;

    
A function which produces a TableRow. The system is responsible for
reusing TableRows. Return from this function a TableRow which
might be usable for representing a single row in a TableView.

Note that a TableRow is not a TableCell. A TableRow is
simply a container for a TableCell, and in most circumstances it is more
likely that you'll want to create custom TableCells, rather than
TableRows. The primary use case for creating custom TableRow
instances would most probably be to introduce some form of column
spanning support.

You can create custom TableCell instances per column by assigning the
appropriate function to the cellFactory property in the TableColumn class.
Returns:
rowFactory property/**
     * A function which produces a TableRow. The system is responsible for
     * reusing TableRows. Return from this function a TableRow which
     * might be usable for representing a single row in a TableView.
     * <p>
     * Note that a TableRow is <b>not</b> a TableCell. A TableRow is
     * simply a container for a TableCell, and in most circumstances it is more
     * likely that you'll want to create custom TableCells, rather than
     * TableRows. The primary use case for creating custom TableRow
     * instances would most probably be to introduce some form of column
     * spanning support.
     * <p>
     * You can create custom TableCell instances per column by assigning the
     * appropriate function to the cellFactory property in the TableColumn class.
     * @return rowFactory property
     */
    public final ObjectProperty<Callback<TableView<S>, TableRow<S>>> rowFactoryProperty() {
        if (rowFactory == null) {
            rowFactory = new SimpleObjectProperty<Callback<TableView<S>, TableRow<S>>>(this, "rowFactory");
        }
        return rowFactory;
    }
    public final void setRowFactory(Callback<TableView<S>, TableRow<S>> value) {
        rowFactoryProperty().set(value);
    }
    public final Callback<TableView<S>, TableRow<S>> getRowFactory() {
        return rowFactory == null ? null : rowFactory.get();
    }


    // --- Placeholder Node
    private ObjectProperty<Node> placeholder;
    
This Node is shown to the user when the table has no content to show.
This may be the case because the table model has no data in the first
place, that a filter has been applied to the table model, resulting
in there being nothing to show the user, or that there are no currently
visible columns.
Returns:
placeholder property/**
     * This Node is shown to the user when the table has no content to show.
     * This may be the case because the table model has no data in the first
     * place, that a filter has been applied to the table model, resulting
     * in there being nothing to show the user, or that there are no currently
     * visible columns.
     * @return placeholder property
     */
    public final ObjectProperty<Node> placeholderProperty() {
        if (placeholder == null) {
            placeholder = new SimpleObjectProperty<Node>(this, "placeholder");
        }
        return placeholder;
    }
    public final void setPlaceholder(Node value) {
        placeholderProperty().set(value);
    }
    public final Node getPlaceholder() {
        return placeholder == null ? null : placeholder.get();
    }


    // --- Selection Model
    private ObjectProperty<TableViewSelectionModel<S>> selectionModel
            = new SimpleObjectProperty<TableViewSelectionModel<S>>(this, "selectionModel") {

        TableViewSelectionModel<S> oldValue = null;

        @Override protected void invalidated() {

            if (oldValue != null) {
                oldValue.cellSelectionEnabledProperty().removeListener(weakCellSelectionModelInvalidationListener);

                if (oldValue instanceof TableViewArrayListSelectionModel) {
                    ((TableViewArrayListSelectionModel)oldValue).dispose();
                }
            }

            oldValue = get();

            if (oldValue != null) {
                oldValue.cellSelectionEnabledProperty().addListener(weakCellSelectionModelInvalidationListener);
                // fake an invalidation to ensure updated pseudo-class state
                weakCellSelectionModelInvalidationListener.invalidated(oldValue.cellSelectionEnabledProperty());
            }
        }
    };

    
The SelectionModel provides the API through which it is possible
to select single or multiple items within a TableView, as  well as inspect
which items have been selected by the user. Note that it has a generic
type that must match the type of the TableView itself.
Returns:
selectionModel property/**
     * The SelectionModel provides the API through which it is possible
     * to select single or multiple items within a TableView, as  well as inspect
     * which items have been selected by the user. Note that it has a generic
     * type that must match the type of the TableView itself.
     * @return selectionModel property
     */
    public final ObjectProperty<TableViewSelectionModel<S>> selectionModelProperty() {
        return selectionModel;
    }
    public final void setSelectionModel(TableViewSelectionModel<S> value) {
        selectionModelProperty().set(value);
    }

    public final TableViewSelectionModel<S> getSelectionModel() {
        return selectionModel.get();
    }


    // --- Focus Model
    private ObjectProperty<TableViewFocusModel<S>> focusModel;
    public final void setFocusModel(TableViewFocusModel<S> value) {
        focusModelProperty().set(value);
    }
    public final TableViewFocusModel<S> getFocusModel() {
        return focusModel == null ? null : focusModel.get();
    }
    
Represents the currently-installed TableViewFocusModel for this TableView. Under almost all circumstances leaving this as the default focus model will suffice. 
Returns:
focusModel property/**
     * Represents the currently-installed {@link TableViewFocusModel} for this
     * TableView. Under almost all circumstances leaving this as the default
     * focus model will suffice.
     * @return focusModel property
     */
    public final ObjectProperty<TableViewFocusModel<S>> focusModelProperty() {
        if (focusModel == null) {
            focusModel = new SimpleObjectProperty<TableViewFocusModel<S>>(this, "focusModel");
        }
        return focusModel;
    }


//    // --- Span Model
//    private ObjectProperty<SpanModel<S>> spanModel
//            = new SimpleObjectProperty<SpanModel<S>>(this, "spanModel") {
//
//        @Override protected void invalidated() {
//            ObservableList<String> styleClass = getStyleClass();
//            if (getSpanModel() == null) {
//                styleClass.remove(CELL_SPAN_TABLE_VIEW_STYLE_CLASS);
//            } else if (! styleClass.contains(CELL_SPAN_TABLE_VIEW_STYLE_CLASS)) {
//                styleClass.add(CELL_SPAN_TABLE_VIEW_STYLE_CLASS);
//            }
//        }
//    };
//
//    public final ObjectProperty<SpanModel<S>> spanModelProperty() {
//        return spanModel;
//    }
//    public final void setSpanModel(SpanModel<S> value) {
//        spanModelProperty().set(value);
//    }
//
//    public final SpanModel<S> getSpanModel() {
//        return spanModel.get();
//    }

    // --- Editable
    private BooleanProperty editable;
    public final void setEditable(boolean value) {
        editableProperty().set(value);
    }
    public final boolean isEditable() {
        return editable == null ? false : editable.get();
    }
    
Specifies whether this TableView is editable - only if the TableView, the
TableColumn (if applicable) and the TableCells within it are both
editable will a TableCell be able to go into their editing state.
Returns:
the editable property/**
     * Specifies whether this TableView is editable - only if the TableView, the
     * TableColumn (if applicable) and the TableCells within it are both
     * editable will a TableCell be able to go into their editing state.
     * @return the editable property
     */
    public final BooleanProperty editableProperty() {
        if (editable == null) {
            editable = new SimpleBooleanProperty(this, "editable", false);
        }
        return editable;
    }


    // --- Fixed cell size
    private DoubleProperty fixedCellSize;

    
Sets the new fixed cell size for this control. Any value greater than
zero will enable fixed cell size mode, whereas a zero or negative value
(or Region.USE_COMPUTED_SIZE) will be used to disabled fixed cell size
mode.
Params:
value – The new fixed cell size value, or a value less than or equal
             to zero (or Region.USE_COMPUTED_SIZE) to disable.
Since:
JavaFX 8.0/**
     * Sets the new fixed cell size for this control. Any value greater than
     * zero will enable fixed cell size mode, whereas a zero or negative value
     * (or Region.USE_COMPUTED_SIZE) will be used to disabled fixed cell size
     * mode.
     *
     * @param value The new fixed cell size value, or a value less than or equal
     *              to zero (or Region.USE_COMPUTED_SIZE) to disable.
     * @since JavaFX 8.0
     */
    public final void setFixedCellSize(double value) {
        fixedCellSizeProperty().set(value);
    }

    
Returns the fixed cell size value. A value less than or equal to zero is
used to represent that fixed cell size mode is disabled, and a value
greater than zero represents the size of all cells in this control.
Returns:
A double representing the fixed cell size of this control, or a
     value less than or equal to zero if fixed cell size mode is disabled.
Since:
JavaFX 8.0/**
     * Returns the fixed cell size value. A value less than or equal to zero is
     * used to represent that fixed cell size mode is disabled, and a value
     * greater than zero represents the size of all cells in this control.
     *
     * @return A double representing the fixed cell size of this control, or a
     *      value less than or equal to zero if fixed cell size mode is disabled.
     * @since JavaFX 8.0
     */
    public final double getFixedCellSize() {
        return fixedCellSize == null ? Region.USE_COMPUTED_SIZE : fixedCellSize.get();
    }
    
Specifies whether this control has cells that are a fixed height (of the
specified value). If this value is less than or equal to zero,
then all cells are individually sized and positioned. This is a slow
operation. Therefore, when performance matters and developers are not
dependent on variable cell sizes it is a good idea to set the fixed cell
size value. Generally cells are around 24px, so setting a fixed cell size
of 24 is likely to result in very little difference in visuals, but a
improvement to performance.
To set this property via CSS, use the -fx-fixed-cell-size property.
This should not be confused with the -fx-cell-size property. The difference
between these two CSS properties is that -fx-cell-size will size all
cells to the specified size, but it will not enforce that this is the
only size (thus allowing for variable cell sizes, and preventing the
performance gains from being possible). Therefore, when performance matters
use -fx-fixed-cell-size, instead of -fx-cell-size. If both properties are
specified in CSS, -fx-fixed-cell-size takes precedence.
Returns:
fixedCellSize property
Since:
JavaFX 8.0/**
     * Specifies whether this control has cells that are a fixed height (of the
     * specified value). If this value is less than or equal to zero,
     * then all cells are individually sized and positioned. This is a slow
     * operation. Therefore, when performance matters and developers are not
     * dependent on variable cell sizes it is a good idea to set the fixed cell
     * size value. Generally cells are around 24px, so setting a fixed cell size
     * of 24 is likely to result in very little difference in visuals, but a
     * improvement to performance.
     *
     * <p>To set this property via CSS, use the -fx-fixed-cell-size property.
     * This should not be confused with the -fx-cell-size property. The difference
     * between these two CSS properties is that -fx-cell-size will size all
     * cells to the specified size, but it will not enforce that this is the
     * only size (thus allowing for variable cell sizes, and preventing the
     * performance gains from being possible). Therefore, when performance matters
     * use -fx-fixed-cell-size, instead of -fx-cell-size. If both properties are
     * specified in CSS, -fx-fixed-cell-size takes precedence.</p>
     *
     * @return fixedCellSize property
     * @since JavaFX 8.0
     */
    public final DoubleProperty fixedCellSizeProperty() {
        if (fixedCellSize == null) {
            fixedCellSize = new StyleableDoubleProperty(Region.USE_COMPUTED_SIZE) {
                @Override public CssMetaData<TableView<?>,Number> getCssMetaData() {
                    return StyleableProperties.FIXED_CELL_SIZE;
                }

                @Override public Object getBean() {
                    return TableView.this;
                }

                @Override public String getName() {
                    return "fixedCellSize";
                }
            };
        }
        return fixedCellSize;
    }


    // --- Editing Cell
    private ReadOnlyObjectWrapper<TablePosition<S,?>> editingCell;
    private void setEditingCell(TablePosition<S,?> value) {
        editingCellPropertyImpl().set(value);
    }
    public final TablePosition<S,?> getEditingCell() {
        return editingCell == null ? null : editingCell.get();
    }

    
Represents the current cell being edited, or null if
there is no cell being edited.
Returns:
the editingCell property/**
     * Represents the current cell being edited, or null if
     * there is no cell being edited.
     * @return the editingCell property
     */
    public final ReadOnlyObjectProperty<TablePosition<S,?>> editingCellProperty() {
        return editingCellPropertyImpl().getReadOnlyProperty();
    }

    private ReadOnlyObjectWrapper<TablePosition<S,?>> editingCellPropertyImpl() {
        if (editingCell == null) {
            editingCell = new ReadOnlyObjectWrapper<TablePosition<S,?>>(this, "editingCell");
        }
        return editingCell;
    }


    // --- Comparator (built via sortOrder list, so read-only)
    
The comparator property is a read-only property that is representative of the current state of the sort order list. The sort order list contains the columns that have been added to it either programmatically or via a user clicking on the headers themselves. 
Since:
JavaFX 8.0/**
     * The comparator property is a read-only property that is representative of the
     * current state of the {@link #getSortOrder() sort order} list. The sort
     * order list contains the columns that have been added to it either programmatically
     * or via a user clicking on the headers themselves.
     * @since JavaFX 8.0
     */
    private ReadOnlyObjectWrapper<Comparator<S>> comparator;
    private void setComparator(Comparator<S> value) {
        comparatorPropertyImpl().set(value);
    }
    public final Comparator<S> getComparator() {
        return comparator == null ? null : comparator.get();
    }
    public final ReadOnlyObjectProperty<Comparator<S>> comparatorProperty() {
        return comparatorPropertyImpl().getReadOnlyProperty();
    }
    private ReadOnlyObjectWrapper<Comparator<S>> comparatorPropertyImpl() {
        if (comparator == null) {
            comparator = new ReadOnlyObjectWrapper<Comparator<S>>(this, "comparator");
        }
        return comparator;
    }


    // --- sortPolicy
    
The sort policy specifies how sorting in this TableView should be performed. For example, a basic sort policy may just call FXCollections.sort(tableView.getItems()), whereas a more advanced sort policy may call to a database to perform the necessary sorting on the server-side. 
TableView ships with a default
sort policy that does precisely as mentioned above: it simply attempts to sort the items list in-place. 
It is recommended that rather than override the sort method that a different sort policy be provided instead. 
Since:
JavaFX 8.0/**
     * The sort policy specifies how sorting in this TableView should be performed.
     * For example, a basic sort policy may just call
     * {@code FXCollections.sort(tableView.getItems())}, whereas a more advanced
     * sort policy may call to a database to perform the necessary sorting on the
     * server-side.
     *
     * <p>TableView ships with a {@link TableView#DEFAULT_SORT_POLICY default
     * sort policy} that does precisely as mentioned above: it simply attempts
     * to sort the items list in-place.
     *
     * <p>It is recommended that rather than override the {@link TableView#sort() sort}
     * method that a different sort policy be provided instead.
     * @since JavaFX 8.0
     */
    private ObjectProperty<Callback<TableView<S>, Boolean>> sortPolicy;
    public final void setSortPolicy(Callback<TableView<S>, Boolean> callback) {
        sortPolicyProperty().set(callback);
    }
    @SuppressWarnings("unchecked")
    public final Callback<TableView<S>, Boolean> getSortPolicy() {
        return sortPolicy == null ?
                (Callback<TableView<S>, Boolean>)(Object) DEFAULT_SORT_POLICY :
                sortPolicy.get();
    }
    @SuppressWarnings("unchecked")
    public final ObjectProperty<Callback<TableView<S>, Boolean>> sortPolicyProperty() {
        if (sortPolicy == null) {
            sortPolicy = new SimpleObjectProperty<Callback<TableView<S>, Boolean>>(
                    this, "sortPolicy", (Callback<TableView<S>, Boolean>)(Object) DEFAULT_SORT_POLICY) {
                @Override protected void invalidated() {
                    sort();
                }
            };
        }
        return sortPolicy;
    }


    // onSort
    
Called when there's a request to sort the control.
Since:
JavaFX 8.0/**
     * Called when there's a request to sort the control.
     * @since JavaFX 8.0
     */
    private ObjectProperty<EventHandler<SortEvent<TableView<S>>>> onSort;

    public void setOnSort(EventHandler<SortEvent<TableView<S>>> value) {
        onSortProperty().set(value);
    }

    public EventHandler<SortEvent<TableView<S>>> getOnSort() {
        if( onSort != null ) {
            return onSort.get();
        }
        return null;
    }

    public ObjectProperty<EventHandler<SortEvent<TableView<S>>>> onSortProperty() {
        if( onSort == null ) {
            onSort = new ObjectPropertyBase<EventHandler<SortEvent<TableView<S>>>>() {
                @Override protected void invalidated() {
                    EventType<SortEvent<TableView<S>>> eventType = SortEvent.sortEvent();
                    EventHandler<SortEvent<TableView<S>>> eventHandler = get();
                    setEventHandler(eventType, eventHandler);
                }

                @Override public Object getBean() {
                    return TableView.this;
                }

                @Override public String getName() {
                    return "onSort";
                }
            };
        }
        return onSort;
    }


    /***************************************************************************
     *                                                                         *
     * Public API                                                              *
     *                                                                         *
     **************************************************************************/
    
The TableColumns that are part of this TableView. As the user reorders
the TableView columns, this list will be updated to reflect the current
visual ordering.
Note: to display any data in a TableView, there must be at least one
TableColumn in this ObservableList.
Returns:
the columns/**
     * The TableColumns that are part of this TableView. As the user reorders
     * the TableView columns, this list will be updated to reflect the current
     * visual ordering.
     *
     * <p>Note: to display any data in a TableView, there must be at least one
     * TableColumn in this ObservableList.</p>
     * @return the columns
     */
    public final ObservableList<TableColumn<S,?>> getColumns() {
        return columns;
    }

    
The sortOrder list defines the order in which TableColumn instances are sorted. An empty sortOrder list means that no sorting is being applied on the TableView. If the sortOrder list has one TableColumn within it, the TableView will be sorted using the sortType and comparator properties of this TableColumn (assuming TableColumn.sortable is true). If the sortOrder list contains multiple TableColumn instances, then the TableView is firstly sorted based on the properties of the first TableColumn. If two elements are considered equal, then the second TableColumn in the list is used to determine ordering. This repeats until the results from all TableColumn comparators are considered, if necessary. 
Returns:
An ObservableList containing zero or more TableColumn instances./**
     * The sortOrder list defines the order in which {@link TableColumn} instances
     * are sorted. An empty sortOrder list means that no sorting is being applied
     * on the TableView. If the sortOrder list has one TableColumn within it,
     * the TableView will be sorted using the
     * {@link TableColumn#sortTypeProperty() sortType} and
     * {@link TableColumn#comparatorProperty() comparator} properties of this
     * TableColumn (assuming
     * {@link TableColumn#sortableProperty() TableColumn.sortable} is true).
     * If the sortOrder list contains multiple TableColumn instances, then
     * the TableView is firstly sorted based on the properties of the first
     * TableColumn. If two elements are considered equal, then the second
     * TableColumn in the list is used to determine ordering. This repeats until
     * the results from all TableColumn comparators are considered, if necessary.
     *
     * @return An ObservableList containing zero or more TableColumn instances.
     */
    public final ObservableList<TableColumn<S,?>> getSortOrder() {
        return sortOrder;
    }

    
Scrolls the TableView so that the given index is visible within the viewport.
Params:
index – The index of an item that should be visible to the user./**
     * Scrolls the TableView so that the given index is visible within the viewport.
     * @param index The index of an item that should be visible to the user.
     */
    public void scrollTo(int index) {
       ControlUtils.scrollToIndex(this, index);
    }

    
Scrolls the TableView so that the given object is visible within the viewport.
Params:
object – The object that should be visible to the user.
Since:
JavaFX 8.0/**
     * Scrolls the TableView so that the given object is visible within the viewport.
     * @param object The object that should be visible to the user.
     * @since JavaFX 8.0
     */
    public void scrollTo(S object) {
        if( getItems() != null ) {
            int idx = getItems().indexOf(object);
            if( idx >= 0 ) {
                ControlUtils.scrollToIndex(this, idx);
            }
        }
    }

    
Called when there's a request to scroll an index into view using scrollTo(int) or scrollTo(Object) 
Since:
JavaFX 8.0/**
     * Called when there's a request to scroll an index into view using {@link #scrollTo(int)}
     * or {@link #scrollTo(Object)}
     * @since JavaFX 8.0
     */
    private ObjectProperty<EventHandler<ScrollToEvent<Integer>>> onScrollTo;

    public void setOnScrollTo(EventHandler<ScrollToEvent<Integer>> value) {
        onScrollToProperty().set(value);
    }

    public EventHandler<ScrollToEvent<Integer>> getOnScrollTo() {
        if( onScrollTo != null ) {
            return onScrollTo.get();
        }
        return null;
    }

    public ObjectProperty<EventHandler<ScrollToEvent<Integer>>> onScrollToProperty() {
        if( onScrollTo == null ) {
            onScrollTo = new ObjectPropertyBase<EventHandler<ScrollToEvent<Integer>>>() {
                @Override
                protected void invalidated() {
                    setEventHandler(ScrollToEvent.scrollToTopIndex(), get());
                }
                @Override
                public Object getBean() {
                    return TableView.this;
                }

                @Override
                public String getName() {
                    return "onScrollTo";
                }
            };
        }
        return onScrollTo;
    }

    
Scrolls the TableView so that the given column is visible within the viewport.
Params:
column – The column that should be visible to the user.
Since:
JavaFX 8.0/**
     * Scrolls the TableView so that the given column is visible within the viewport.
     * @param column The column that should be visible to the user.
     * @since JavaFX 8.0
     */
    public void scrollToColumn(TableColumn<S, ?> column) {
        ControlUtils.scrollToColumn(this, column);
    }

    
Scrolls the TableView so that the given index is visible within the viewport.
Params:
columnIndex – The index of a column that should be visible to the user.
Since:
JavaFX 8.0/**
     * Scrolls the TableView so that the given index is visible within the viewport.
     * @param columnIndex The index of a column that should be visible to the user.
     * @since JavaFX 8.0
     */
    public void scrollToColumnIndex(int columnIndex) {
        if( getColumns() != null ) {
            ControlUtils.scrollToColumn(this, getColumns().get(columnIndex));
        }
    }

    
Called when there's a request to scroll a column into view using scrollToColumn(TableColumn) or scrollToColumnIndex(int) 
Since:
JavaFX 8.0/**
     * Called when there's a request to scroll a column into view using {@link #scrollToColumn(TableColumn)}
     * or {@link #scrollToColumnIndex(int)}
     * @since JavaFX 8.0
     */
    private ObjectProperty<EventHandler<ScrollToEvent<TableColumn<S, ?>>>> onScrollToColumn;

    public void setOnScrollToColumn(EventHandler<ScrollToEvent<TableColumn<S, ?>>> value) {
        onScrollToColumnProperty().set(value);
    }

    public EventHandler<ScrollToEvent<TableColumn<S, ?>>> getOnScrollToColumn() {
        if( onScrollToColumn != null ) {
            return onScrollToColumn.get();
        }
        return null;
    }

    public ObjectProperty<EventHandler<ScrollToEvent<TableColumn<S, ?>>>> onScrollToColumnProperty() {
        if( onScrollToColumn == null ) {
            onScrollToColumn = new ObjectPropertyBase<EventHandler<ScrollToEvent<TableColumn<S, ?>>>>() {
                @Override protected void invalidated() {
                    EventType<ScrollToEvent<TableColumn<S, ?>>> type = ScrollToEvent.scrollToColumn();
                    setEventHandler(type, get());
                }

                @Override public Object getBean() {
                    return TableView.this;
                }

                @Override public String getName() {
                    return "onScrollToColumn";
                }
            };
        }
        return onScrollToColumn;
    }

    
Applies the currently installed resize policy against the given column,
resizing it based on the delta value provided.
Params:
column – the column
delta – the delta
Returns:
true if column resize is allowed/**
     * Applies the currently installed resize policy against the given column,
     * resizing it based on the delta value provided.
     * @param column the column
     * @param delta the delta
     * @return true if column resize is allowed
     */
    public boolean resizeColumn(TableColumn<S,?> column, double delta) {
        if (column == null || Double.compare(delta, 0.0) == 0) return false;

        boolean allowed = getColumnResizePolicy().call(new ResizeFeatures<S>(TableView.this, column, delta));
        if (!allowed) return false;

        return true;
    }

    
Causes the cell at the given row/column view indexes to switch into
its editing state, if it is not already in it, and assuming that the
TableView and column are also editable.
Note: This method will cancel editing if the given row
value is less than zero and the given column is null.
Params:
row – the row
column – the column/**
     * Causes the cell at the given row/column view indexes to switch into
     * its editing state, if it is not already in it, and assuming that the
     * TableView and column are also editable.
     *
     * <p><strong>Note:</strong> This method will cancel editing if the given row
     * value is less than zero and the given column is null.</p>
     * @param row the row
     * @param column the column
     */
    public void edit(int row, TableColumn<S,?> column) {
        if (!isEditable() || (column != null && ! column.isEditable())) {
            return;
        }

        if (row < 0 && column == null) {
            setEditingCell(null);
        } else {
            setEditingCell(new TablePosition<>(this, row, column));
        }
    }

    
Returns an unmodifiable list containing the currently visible leaf columns.
Returns:
an unmodifiable list containing the currently visible leaf columns/**
     * Returns an unmodifiable list containing the currently visible leaf columns.
     * @return an unmodifiable list containing the currently visible leaf columns
     */
    public ObservableList<TableColumn<S,?>> getVisibleLeafColumns() {
        return unmodifiableVisibleLeafColumns;
    }

    
Returns the position of the given column, relative to all other
visible leaf columns.
Params:
column – the column
Returns:
the position of the given column, relative to all other
visible leaf columns/**
     * Returns the position of the given column, relative to all other
     * visible leaf columns.
     * @param column the column
     * @return the position of the given column, relative to all other
     * visible leaf columns
     */
    public int getVisibleLeafIndex(TableColumn<S,?> column) {
        return visibleLeafColumns.indexOf(column);
    }

    
Returns the TableColumn in the given column index, relative to all other
visible leaf columns.
Params:
column – the column
Returns:
the TableColumn in the given column index, relative to all other
visible leaf columns/**
     * Returns the TableColumn in the given column index, relative to all other
     * visible leaf columns.
     * @param column the column
     * @return the TableColumn in the given column index, relative to all other
     * visible leaf columns
     */
    public TableColumn<S,?> getVisibleLeafColumn(int column) {
        if (column < 0 || column >= visibleLeafColumns.size()) return null;
        return visibleLeafColumns.get(column);
    }

    
{@inheritDoc} /** {@inheritDoc} */
    @Override protected Skin<?> createDefaultSkin() {
        return new TableViewSkin<S>(this);
    }

    
The sort method forces the TableView to re-run its sorting algorithm. More often than not it is not necessary to call this method directly, as it is automatically called when the sort order, sort policy, or the state of the TableColumn sort type properties change. In other words, this method should only be called directly when something external changes and a sort is required. 
Since:
JavaFX 8.0/**
     * The sort method forces the TableView to re-run its sorting algorithm. More
     * often than not it is not necessary to call this method directly, as it is
     * automatically called when the {@link #getSortOrder() sort order},
     * {@link #sortPolicyProperty() sort policy}, or the state of the
     * TableColumn {@link TableColumn#sortTypeProperty() sort type} properties
     * change. In other words, this method should only be called directly when
     * something external changes and a sort is required.
     * @since JavaFX 8.0
     */
    public void sort() {
        final ObservableList<? extends TableColumnBase<S,?>> sortOrder = getSortOrder();

        // update the Comparator property
        final Comparator<S> oldComparator = getComparator();
        setComparator(sortOrder.isEmpty() ? null : new TableColumnComparator(sortOrder));

        // fire the onSort event and check if it is consumed, if
        // so, don't run the sort
        SortEvent<TableView<S>> sortEvent = new SortEvent<>(TableView.this, TableView.this);
        fireEvent(sortEvent);
        if (sortEvent.isConsumed()) {
            // if the sort is consumed we could back out the last action (the code
            // is commented out right below), but we don't as we take it as a
            // sign that the developer has decided to handle the event themselves.

            // sortLock = true;
            // TableUtil.handleSortFailure(sortOrder, lastSortEventType, lastSortEventSupportInfo);
            // sortLock = false;
            return;
        }

        final List<TablePosition> prevState = new ArrayList<>(getSelectionModel().getSelectedCells());
        final int itemCount = prevState.size();

        // we set makeAtomic to true here, so that we don't fire intermediate
        // sort events - instead we send a single permutation event at the end
        // of this method.
        getSelectionModel().startAtomic();

        // get the sort policy and run it
        Callback<TableView<S>, Boolean> sortPolicy = getSortPolicy();
        if (sortPolicy == null) return;
        Boolean success = sortPolicy.call(this);

        getSelectionModel().stopAtomic();

        if (success == null || ! success) {
            // the sort was a failure. Need to backout if possible
            sortLock = true;
            TableUtil.handleSortFailure(sortOrder, lastSortEventType, lastSortEventSupportInfo);
            setComparator(oldComparator);
            sortLock = false;
        } else {
            // sorting was a success, now we possibly fire an event on the
            // selection model that the items list has 'permutated' to a new ordering

            // FIXME we should support alternative selection model implementations!
            if (getSelectionModel() instanceof TableViewArrayListSelectionModel) {
                final TableViewArrayListSelectionModel<S> sm = (TableViewArrayListSelectionModel<S>) getSelectionModel();
                final ObservableList<TablePosition<S,?>> newState = (ObservableList<TablePosition<S,?>>)(Object)sm.getSelectedCells();

                List<TablePosition<S, ?>> removed = new ArrayList<>();
                for (int i = 0; i < itemCount; i++) {
                    TablePosition<S, ?> prevItem = prevState.get(i);
                    if (!newState.contains(prevItem)) {
                        removed.add(prevItem);
                    }
                }

                if (!removed.isEmpty()) {
                    // the sort operation effectively permutates the selectedCells list,
                    // but we cannot fire a permutation event as we are talking about
                    // TablePosition's changing (which may reside in the same list
                    // position before and after the sort). Therefore, we need to fire
                    // a single add/remove event to cover the added and removed positions.
                    ListChangeListener.Change<TablePosition<S, ?>> c = new NonIterableChange.GenericAddRemoveChange<>(0, itemCount, removed, newState);
                    sm.fireCustomSelectedCellsListChangeEvent(c);
                }
            }
        }
    }

    
Calling refresh() forces the TableView control to recreate and repopulate the cells necessary to populate the visual bounds of the control. In other words, this forces the TableView to update what it is showing to the user. This is useful in cases where the underlying data source has changed in a way that is not observed by the TableView itself. 
Since:
JavaFX 8u60/**
     * Calling {@code refresh()} forces the TableView control to recreate and
     * repopulate the cells necessary to populate the visual bounds of the control.
     * In other words, this forces the TableView to update what it is showing to
     * the user. This is useful in cases where the underlying data source has
     * changed in a way that is not observed by the TableView itself.
     *
     * @since JavaFX 8u60
     */
    public void refresh() {
        getProperties().put(Properties.RECREATE, Boolean.TRUE);
    }



    
                                                                        *
Private Implementation                                                  *
                                                                        *
/***************************************************************************
     *                                                                         *
     * Private Implementation                                                  *
     *                                                                         *
     **************************************************************************/

    private boolean sortLock = false;
    private TableUtil.SortEventType lastSortEventType = null;
    private Object[] lastSortEventSupportInfo = null;

    private void doSort(final TableUtil.SortEventType sortEventType, final Object... supportInfo) {
        if (sortLock) {
            return;
        }

        this.lastSortEventType = sortEventType;
        this.lastSortEventSupportInfo = supportInfo;
        sort();
        this.lastSortEventType = null;
        this.lastSortEventSupportInfo = null;
    }


    // --- Content width
    private void setContentWidth(double contentWidth) {
        this.contentWidth = contentWidth;
        if (isInited) {
            // sometimes the current column resize policy will have to modify the
            // column width of all columns in the table if the table width changes,
            // so we short-circuit the resize function and just go straight there
            // with a null TableColumn, which indicates to the resize policy function
            // that it shouldn't actually do anything specific to one column.
            getColumnResizePolicy().call(new ResizeFeatures<S>(TableView.this, null, 0.0));
        }
    }

    
Recomputes the currently visible leaf columns in this TableView.
/**
     * Recomputes the currently visible leaf columns in this TableView.
     */
    private void updateVisibleLeafColumns() {
        // update visible leaf columns list
        List<TableColumn<S,?>> cols = new ArrayList<TableColumn<S,?>>();
        buildVisibleLeafColumns(getColumns(), cols);
        visibleLeafColumns.setAll(cols);

        // sometimes the current column resize policy will have to modify the
        // column width of all columns in the table if the table width changes,
        // so we short-circuit the resize function and just go straight there
        // with a null TableColumn, which indicates to the resize policy function
        // that it shouldn't actually do anything specific to one column.
        getColumnResizePolicy().call(new ResizeFeatures<S>(TableView.this, null, 0.0));
    }

    private void buildVisibleLeafColumns(List<TableColumn<S,?>> cols, List<TableColumn<S,?>> vlc) {
        for (TableColumn<S,?> c : cols) {
            if (c == null) continue;

            boolean hasChildren = ! c.getColumns().isEmpty();

            if (hasChildren) {
                buildVisibleLeafColumns(c.getColumns(), vlc);
            } else if (c.isVisible()) {
                vlc.add(c);
            }
        }
    }



    
                                                                        *
Stylesheet Handling                                                     *
                                                                        *
/***************************************************************************
     *                                                                         *
     * Stylesheet Handling                                                     *
     *                                                                         *
     **************************************************************************/

    private static final String DEFAULT_STYLE_CLASS = "table-view";

    private static final PseudoClass PSEUDO_CLASS_CELL_SELECTION =
            PseudoClass.getPseudoClass("cell-selection");
    private static final PseudoClass PSEUDO_CLASS_ROW_SELECTION =
            PseudoClass.getPseudoClass("row-selection");

    private static class StyleableProperties {
        private static final CssMetaData<TableView<?>,Number> FIXED_CELL_SIZE =
                new CssMetaData<TableView<?>,Number>("-fx-fixed-cell-size",
                                                    SizeConverter.getInstance(),
                                                    Region.USE_COMPUTED_SIZE) {

                    @Override public Double getInitialValue(TableView<?> node) {
                        return node.getFixedCellSize();
                    }

                    @Override public boolean isSettable(TableView<?> n) {
                        return n.fixedCellSize == null || !n.fixedCellSize.isBound();
                    }

                    @Override public StyleableProperty<Number> getStyleableProperty(TableView<?> n) {
                        return (StyleableProperty<Number>) n.fixedCellSizeProperty();
                    }
                };

        private static final List<CssMetaData<? extends Styleable, ?>> STYLEABLES;
        static {
            final List<CssMetaData<? extends Styleable, ?>> styleables =
                    new ArrayList<CssMetaData<? extends Styleable, ?>>(Control.getClassCssMetaData());
            styleables.add(FIXED_CELL_SIZE);
            STYLEABLES = Collections.unmodifiableList(styleables);
        }
    }

    
Returns:
The CssMetaData associated with this class, which may include the
CssMetaData of its superclasses.
Since:
JavaFX 8.0/**
     * @return The CssMetaData associated with this class, which may include the
     * CssMetaData of its superclasses.
     * @since JavaFX 8.0
     */
    public static List<CssMetaData<? extends Styleable, ?>> getClassCssMetaData() {
        return StyleableProperties.STYLEABLES;
    }

    
{@inheritDoc}
Since:
JavaFX 8.0/**
     * {@inheritDoc}
     * @since JavaFX 8.0
     */
    @Override
    public List<CssMetaData<? extends Styleable, ?>> getControlCssMetaData() {
        return getClassCssMetaData();
    }



    /***************************************************************************
     *                                                                         *
     * Accessibility handling                                                  *
     *                                                                         *
     **************************************************************************/

    
{@inheritDoc} /** {@inheritDoc} */
    @Override
    public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
        switch (attribute) {
            case COLUMN_COUNT: return getVisibleLeafColumns().size();
            case ROW_COUNT: return getItems().size();
            case SELECTED_ITEMS: {
                // TableViewSkin returns TableRows back to TableView.
                // TableRowSkin returns TableCells back to TableRow.
                @SuppressWarnings("unchecked")
                ObservableList<TableRow<S>> rows = (ObservableList<TableRow<S>>)super.queryAccessibleAttribute(attribute, parameters);
                List<Node> selection = new ArrayList<>();
                for (TableRow<S> row : rows) {
                    @SuppressWarnings("unchecked")
                    ObservableList<Node> cells = (ObservableList<Node>)row.queryAccessibleAttribute(attribute, parameters);
                    if (cells != null) selection.addAll(cells);
                }
                return FXCollections.observableArrayList(selection);
            }
            case FOCUS_ITEM: {
                Node row = (Node)super.queryAccessibleAttribute(attribute, parameters);
                if (row == null) return null;
                Node cell = (Node)row.queryAccessibleAttribute(attribute, parameters);
                /* cell equals to null means the row is a placeholder node */
                return cell != null ?  cell : row;
            }
            case CELL_AT_ROW_COLUMN: {
                @SuppressWarnings("unchecked")
                TableRow<S> row = (TableRow<S>)super.queryAccessibleAttribute(attribute, parameters);
                return row != null ? row.queryAccessibleAttribute(attribute, parameters) : null;
            }
            case MULTIPLE_SELECTION: {
                MultipleSelectionModel<S> sm = getSelectionModel();
                return sm != null && sm.getSelectionMode() == SelectionMode.MULTIPLE;
            }
            default: return super.queryAccessibleAttribute(attribute, parameters);
        }
    }


    /***************************************************************************
     *                                                                         *
     * Support Interfaces                                                      *
     *                                                                         *
     **************************************************************************/

     
An immutable wrapper class for use in the TableView column resize functionality. 
Since:
JavaFX 2.0/**
      * An immutable wrapper class for use in the TableView
     * {@link TableView#columnResizePolicyProperty() column resize} functionality.
      * @since JavaFX 2.0
      */
     public static class ResizeFeatures<S> extends ResizeFeaturesBase<S> {
        private TableView<S> table;

        
Creates an instance of this class, with the provided TableView,
TableColumn and delta values being set and stored in this immutable
instance.
Params:
table – The TableView upon which the resize operation is occurring.
column – The column upon which the resize is occurring, or null
     if this ResizeFeatures instance is being created as a result of a
     TableView resize operation.
delta – The amount of horizontal space added or removed in the
     resize operation./**
         * Creates an instance of this class, with the provided TableView,
         * TableColumn and delta values being set and stored in this immutable
         * instance.
         *
         * @param table The TableView upon which the resize operation is occurring.
         * @param column The column upon which the resize is occurring, or null
         *      if this ResizeFeatures instance is being created as a result of a
         *      TableView resize operation.
         * @param delta The amount of horizontal space added or removed in the
         *      resize operation.
         */
        public ResizeFeatures(TableView<S> table, TableColumn<S,?> column, Double delta) {
            super(column, delta);
            this.table = table;
        }

        
Returns the column upon which the resize is occurring, or null
if this ResizeFeatures instance was created as a result of a
TableView resize operation.
/**
         * Returns the column upon which the resize is occurring, or null
         * if this ResizeFeatures instance was created as a result of a
         * TableView resize operation.
         */
        @Override public TableColumn<S,?> getColumn() {
            return (TableColumn<S,?>) super.getColumn();
        }

        
Returns the TableView upon which the resize operation is occurring.
Returns:
the TableView/**
         * Returns the TableView upon which the resize operation is occurring.
         * @return the TableView
         */
        public TableView<S> getTable() {
            return table;
        }
    }



    /***************************************************************************
     *                                                                         *
     * Support Classes                                                         *
     *                                                                         *
     **************************************************************************/


    
A simple extension of the SelectionModel abstract class to allow for special support for TableView controls. 
Since:
JavaFX 2.0/**
     * A simple extension of the {@link SelectionModel} abstract class to
     * allow for special support for TableView controls.
     * @since JavaFX 2.0
     */
    public static abstract class TableViewSelectionModel<S> extends TableSelectionModel<S> {

        
                                                                    *
Private fields                                                      *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Private fields                                                      *
         *                                                                     *
         **********************************************************************/

        private final TableView<S> tableView;

        boolean blockFocusCall = false;



        /***********************************************************************
         *                                                                     *
         * Constructors                                                        *
         *                                                                     *
         **********************************************************************/

        
Builds a default TableViewSelectionModel instance with the provided
TableView.
Params:
tableView – The TableView upon which this selection model should
     operate.
Throws:
NullPointerException – TableView can not be null./**
         * Builds a default TableViewSelectionModel instance with the provided
         * TableView.
         * @param tableView The TableView upon which this selection model should
         *      operate.
         * @throws NullPointerException TableView can not be null.
         */
        public TableViewSelectionModel(final TableView<S> tableView) {
            if (tableView == null) {
                throw new NullPointerException("TableView can not be null");
            }

            this.tableView = tableView;
        }



        /***********************************************************************
         *                                                                     *
         * Abstract API                                                        *
         *                                                                     *
         **********************************************************************/

        
A read-only ObservableList representing the currently selected cells
in this TableView. Rather than directly modify this list, please
use the other methods provided in the TableViewSelectionModel.
Returns:
a read-only ObservableList representing the currently
selected cells in this TableView/**
         * A read-only ObservableList representing the currently selected cells
         * in this TableView. Rather than directly modify this list, please
         * use the other methods provided in the TableViewSelectionModel.
         * @return a read-only ObservableList representing the currently
         * selected cells in this TableView
         */
        public abstract ObservableList<TablePosition> getSelectedCells();


        /***********************************************************************
         *                                                                     *
         * Generic (type erasure) bridging                                     *
         *                                                                     *
         **********************************************************************/

        // --- isSelected
        
{@inheritDoc} /** {@inheritDoc} */
        @Override public boolean isSelected(int row, TableColumnBase<S, ?> column) {
            return isSelected(row, (TableColumn<S,?>)column);
        }

        
Convenience function which tests whether the given row and column index
is currently selected in this table instance.
Params:
row – the row
column – the column
Returns:
true if row and column index is currently selected/**
         * Convenience function which tests whether the given row and column index
         * is currently selected in this table instance.
         * @param row the row
         * @param column the column
         * @return true if row and column index is currently selected
         */
        public abstract boolean isSelected(int row, TableColumn<S, ?> column);


        // --- select
        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void select(int row, TableColumnBase<S, ?> column) {
            select(row, (TableColumn<S,?>)column);
        }

        
Selects the cell at the given row/column intersection.
Params:
row – the row
column – the column/**
         * Selects the cell at the given row/column intersection.
         * @param row the row
         * @param column the column
         */
        public abstract void select(int row, TableColumn<S, ?> column);


        // --- clearAndSelect
        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void clearAndSelect(int row, TableColumnBase<S,?> column) {
            clearAndSelect(row, (TableColumn<S,?>) column);
        }

        
Clears all selection, and then selects the cell at the given row/column
intersection.
Params:
row – the row
column – the column/**
         * Clears all selection, and then selects the cell at the given row/column
         * intersection.
         * @param row the row
         * @param column the column
         */
        public abstract void clearAndSelect(int row, TableColumn<S,?> column);


        // --- clearSelection
        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void clearSelection(int row, TableColumnBase<S,?> column) {
            clearSelection(row, (TableColumn<S,?>) column);
        }

        
Removes selection from the specified row/column position (in view indexes).
If this particular cell (or row if the column value is -1) is not selected,
nothing happens.
Params:
row – the row
column – the column/**
         * Removes selection from the specified row/column position (in view indexes).
         * If this particular cell (or row if the column value is -1) is not selected,
         * nothing happens.
         * @param row the row
         * @param column the column
         */
        public abstract void clearSelection(int row, TableColumn<S, ?> column);

        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void selectRange(int minRow, TableColumnBase<S,?> minColumn,
                                          int maxRow, TableColumnBase<S,?> maxColumn) {
            final int minColumnIndex = tableView.getVisibleLeafIndex((TableColumn<S,?>)minColumn);
            final int maxColumnIndex = tableView.getVisibleLeafIndex((TableColumn<S,?>)maxColumn);
            for (int _row = minRow; _row <= maxRow; _row++) {
                for (int _col = minColumnIndex; _col <= maxColumnIndex; _col++) {
                    select(_row, tableView.getVisibleLeafColumn(_col));
                }
            }
        }



        /***********************************************************************
         *                                                                     *
         * Public API                                                          *
         *                                                                     *
         **********************************************************************/

        
Returns the TableView instance that this selection model is installed in.
Returns:
the TableView/**
         * Returns the TableView instance that this selection model is installed in.
         * @return the TableView
         */
        public TableView<S> getTableView() {
            return tableView;
        }

        
Convenience method that returns getTableView().getItems().
Returns:
The items list of the current TableView./**
         * Convenience method that returns getTableView().getItems().
         * @return The items list of the current TableView.
         */
        protected List<S> getTableModel()  {
            return tableView.getItems();
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override protected S getModelItem(int index) {
            if (index < 0 || index >= getItemCount()) return null;
            return tableView.getItems().get(index);
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override protected int getItemCount() {
            return getTableModel().size();
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void focus(int row) {
            focus(row, null);
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override public int getFocusedIndex() {
            return getFocusedCell().getRow();
        }



        
                                                                    *
Private implementation                                              *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Private implementation                                              *
         *                                                                     *
         **********************************************************************/

        void focus(int row, TableColumn<S,?> column) {
            focus(new TablePosition<>(getTableView(), row, column));
            getTableView().notifyAccessibleAttributeChanged(AccessibleAttribute.FOCUS_ITEM);
        }

        void focus(TablePosition<S,?> pos) {
            if (blockFocusCall) return;
            if (getTableView().getFocusModel() == null) return;

            getTableView().getFocusModel().focus(pos.getRow(), pos.getTableColumn());
        }

        TablePosition<S,?> getFocusedCell() {
            if (getTableView().getFocusModel() == null) {
                return new TablePosition<>(getTableView(), -1, null);
            }
            return getTableView().getFocusModel().getFocusedCell();
        }
    }



    
A primitive selection model implementation, using a List to store all
selected indices.
/**
     * A primitive selection model implementation, using a List<Integer> to store all
     * selected indices.
     */
    // package for testing
    static class TableViewArrayListSelectionModel<S> extends TableViewSelectionModel<S> {

        private int itemCount = 0;

        private final MappingChange.Map<TablePosition<S,?>,Integer> cellToIndicesMap = f -> f.getRow();

        
                                                                    *
Constructors                                                        *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Constructors                                                        *
         *                                                                     *
         **********************************************************************/

        public TableViewArrayListSelectionModel(final TableView<S> tableView) {
            super(tableView);
            this.tableView = tableView;

            this.itemsPropertyListener = new InvalidationListener() {
                private WeakReference<ObservableList<S>> weakItemsRef = new WeakReference<>(tableView.getItems());

                @Override public void invalidated(Observable observable) {
                    ObservableList<S> oldItems = weakItemsRef.get();
                    weakItemsRef = new WeakReference<>(tableView.getItems());
                    updateItemsObserver(oldItems, tableView.getItems());

                    ((SelectedItemsReadOnlyObservableList)getSelectedItems()).setItemsList(tableView.getItems());
                }
            };
            this.tableView.itemsProperty().addListener(itemsPropertyListener);

            selectedCellsMap = new SelectedCellsMap<TablePosition<S,?>>(this::fireCustomSelectedCellsListChangeEvent) {
                @Override public boolean isCellSelectionEnabled() {
                    return TableViewArrayListSelectionModel.this.isCellSelectionEnabled();
                }
            };

            selectedCellsSeq = new ReadOnlyUnbackedObservableList<TablePosition<S,?>>() {
                @Override public TablePosition<S,?> get(int i) {
                    return selectedCellsMap.get(i);
                }

                @Override public int size() {
                    return selectedCellsMap.size();
                }
            };
//            selectedCellsSeq.addListener((ListChangeListener<? super TablePosition<S,?>>) c -> {
//                ControlUtils.updateSelectedIndices(this, c);
//            });


            /*
             * The following listener is used in conjunction with
             * SelectionModel.select(T obj) to allow for a developer to select
             * an item that is not actually in the data model. When this occurs,
             * we actively try to find an index that matches this object, going
             * so far as to actually watch for all changes to the items list,
             * rechecking each time.
             */

            // watching for changes to the items list content
            ObservableList<S> items = getTableView().getItems();
            if (items != null) {
                ((SelectedItemsReadOnlyObservableList)getSelectedItems()).setItemsList(items);
                items.addListener(weakItemsContentListener);
            }


            updateItemCount();

            updateDefaultSelection();

            cellSelectionEnabledProperty().addListener(o -> {
                updateDefaultSelection();
                TableCellBehaviorBase.setAnchor(tableView, getFocusedCell(), true);
            });
        }

        private void dispose() {
            this.tableView.itemsProperty().removeListener(itemsPropertyListener);

            ObservableList<S> items = getTableView().getItems();
            if (items != null) {
                items.removeListener(weakItemsContentListener);
            }
        }

        private final TableView<S> tableView;

        final InvalidationListener itemsPropertyListener;

        final ListChangeListener<S> itemsContentListener = c -> {
            updateItemCount();

            List<S> items1 = getTableModel();
            boolean doSelectionUpdate = true;

            while (c.next()) {
                if (c.wasReplaced() || c.getAddedSize() == getItemCount()) {
                    this.selectedItemChange = c;
                    updateDefaultSelection();
                    this.selectedItemChange = null;
                    return;
                }

                final S selectedItem = getSelectedItem();
                final int selectedIndex = getSelectedIndex();

                if (items1 == null || items1.isEmpty()) {
                    clearSelection();
                } else if (getSelectedIndex() == -1 && getSelectedItem() != null) {
                    int newIndex = items1.indexOf(getSelectedItem());
                    if (newIndex != -1) {
                        setSelectedIndex(newIndex);
                        doSelectionUpdate = false;
                    }
                } else if (c.wasRemoved() &&
                        c.getRemovedSize() == 1 &&
                        ! c.wasAdded() &&
                        selectedItem != null &&
                        selectedItem.equals(c.getRemoved().get(0))) {
                    // Bug fix for RT-28637
                    if (getSelectedIndex() < getItemCount()) {
                        final int previousRow = selectedIndex == 0 ? 0 : selectedIndex - 1;
                        S newSelectedItem = getModelItem(previousRow);
                        if (! selectedItem.equals(newSelectedItem)) {
                            clearAndSelect(previousRow);
                        }
                    }
                }
            }

            if (doSelectionUpdate) {
                updateSelection(c);
            }
        };

        final WeakListChangeListener<S> weakItemsContentListener
                = new WeakListChangeListener<>(itemsContentListener);



        
                                                                    *
Observable properties (and getters/setters)                         *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Observable properties (and getters/setters)                         *
         *                                                                     *
         **********************************************************************/

        // the only 'proper' internal data structure, selectedItems and selectedIndices
        // are both 'read-only and unbacked'.
        private final SelectedCellsMap<TablePosition<S,?>> selectedCellsMap;

        // we create a ReadOnlyUnbackedObservableList of selectedCells here so
        // that we can fire custom list change events.
        private final ReadOnlyUnbackedObservableList<TablePosition<S,?>> selectedCellsSeq;
        @Override public ObservableList<TablePosition> getSelectedCells() {
            return (ObservableList<TablePosition>)(Object)selectedCellsSeq;
        }



        
                                                                    *
Internal properties                                                 *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Internal properties                                                 *
         *                                                                     *
         **********************************************************************/

        private int previousModelSize = 0;

        // Listen to changes in the tableview items list, such that when it
        // changes we can update the selected indices list to refer to the
        // new indices.
        private void updateSelection(ListChangeListener.Change<? extends S> c) {
            c.reset();

            int shift = 0;
            int startRow = -1;
            while (c.next()) {
                if (c.wasReplaced()) {
                    if (c.getList().isEmpty()) {
                        // the entire items list was emptied - clear selection
                        clearSelection();
                    } else {
                        int index = getSelectedIndex();

                        if (previousModelSize == c.getRemovedSize()) {
                            // all items were removed from the model
                            clearSelection();
                        } else if (index < getItemCount() && index >= 0) {
                            // Fix for RT-18969: the list had setAll called on it
                            // Use of makeAtomic is a fix for RT-20945
                            startAtomic();
                            clearSelection(index);
                            stopAtomic();
                            select(index);
                        } else {
                            // Fix for RT-22079
                            clearSelection();
                        }
                    }
                } else if (c.wasAdded() || c.wasRemoved()) {
                    startRow = c.getFrom();
                    shift += c.wasAdded() ? c.getAddedSize() : -c.getRemovedSize();
                } else if (c.wasPermutated()) {
                    // General approach:
                    //   -- detected a sort has happened
                    //   -- Create a permutation lookup map (1)
                    //   -- dump all the selected indices into a list (2)
                    //   -- create a list containing the new indices (3)
                    //   -- for each previously-selected index (4)
                    //     -- if index is in the permutation lookup map
                    //       -- add the new index to the new indices list
                    //   -- Perform batch selection (5)

                    startAtomic();

                    final int oldSelectedIndex = getSelectedIndex();

                    // (1)
                    int length = c.getTo() - c.getFrom();
                    HashMap<Integer, Integer> pMap = new HashMap<> (length);
                    for (int i = c.getFrom(); i < c.getTo(); i++) {
                        pMap.put(i, c.getPermutation(i));
                    }

                    // (2)
                    List<TablePosition<S,?>> selectedIndices = new ArrayList<>((ObservableList<TablePosition<S,?>>)(Object)getSelectedCells());

                    // (3)
                    List<TablePosition<S,?>> newIndices = new ArrayList<>(selectedIndices.size());

                    // (4)
                    boolean selectionIndicesChanged = false;
                    for (int i = 0; i < selectedIndices.size(); i++) {
                        final TablePosition<S,?> oldIndex = selectedIndices.get(i);
                        final int oldRow = oldIndex.getRow();

                        if (pMap.containsKey(oldRow)) {
                            int newIndex = pMap.get(oldRow);

                            selectionIndicesChanged = selectionIndicesChanged || newIndex != oldRow;

                            newIndices.add(new TablePosition<>(oldIndex.getTableView(), newIndex, oldIndex.getTableColumn()));
                        }
                    }

                    if (selectionIndicesChanged) {
                        // (5)
                        quietClearSelection();
                        stopAtomic();

                        selectedCellsMap.setAll(newIndices);

                        if (oldSelectedIndex >= 0 && oldSelectedIndex < itemCount) {
                            int newIndex = c.getPermutation(oldSelectedIndex);
                            setSelectedIndex(newIndex);
                            focus(newIndex);
                        }
                    } else {
                        stopAtomic();
                    }
                }
            }

            TablePosition<S,?> anchor = TableCellBehavior.getAnchor(tableView, null);
            if (shift != 0 && startRow >= 0 && anchor != null && (c.wasRemoved() || c.wasAdded())) {
                if (isSelected(anchor.getRow(), anchor.getTableColumn())) {
                    TablePosition<S,?> newAnchor = new TablePosition<>(tableView, anchor.getRow() + shift, anchor.getTableColumn());
                    TableCellBehavior.setAnchor(tableView, newAnchor, false);
                }
            }

            shiftSelection(startRow, shift, new Callback<ShiftParams, Void>() {
                @Override public Void call(ShiftParams param) {

                    // we make the shifts atomic, as otherwise listeners to
                    // the items / indices lists get a lot of intermediate
                    // noise. They eventually get the summary event fired
                    // from within shiftSelection, so this is ok.
                    startAtomic();

                    final int clearIndex = param.getClearIndex();
                    final int setIndex = param.getSetIndex();
                    TablePosition<S,?> oldTP = null;
                    if (clearIndex > -1) {
                        for (int i = 0; i < selectedCellsMap.size(); i++) {
                            TablePosition<S,?> tp = selectedCellsMap.get(i);
                            if (tp.getRow() == clearIndex) {
                                oldTP = tp;
                                selectedCellsMap.remove(tp);
                            } else if (tp.getRow() == setIndex && !param.isSelected()) {
                                selectedCellsMap.remove(tp);
                            }
                        }
                    }

                    if (oldTP != null && param.isSelected()) {
                        TablePosition<S,?> newTP = new TablePosition<>(
                                tableView, param.getSetIndex(), oldTP.getTableColumn());

                        selectedCellsMap.add(newTP);
                    }

                    stopAtomic();

                    return null;
                }
            });

            previousModelSize = getItemCount();
        }

        
                                                                    *
Public selection API                                                *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Public selection API                                                *
         *                                                                     *
         **********************************************************************/

        @Override public void clearAndSelect(int row) {
            clearAndSelect(row, null);
        }

        @Override public void clearAndSelect(int row, TableColumn<S,?> column) {
            if (row < 0 || row >= getItemCount()) return;

            final TablePosition<S,?> newTablePosition = new TablePosition<>(getTableView(), row, column);
            final boolean isCellSelectionEnabled = isCellSelectionEnabled();

            // replace the anchor
            TableCellBehavior.setAnchor(tableView, newTablePosition, false);

            // firstly we make a copy of the selection, so that we can send out
            // the correct details in the selection change event.
            List<TablePosition<S,?>> previousSelection = new ArrayList<>(selectedCellsMap.getSelectedCells());

            // secondly we check if we can short-circuit out of here because the new selection
            // equals the current selection
            final boolean wasSelected = isSelected(row, column);
            if (wasSelected && previousSelection.size() == 1) {
                // before we return, we double-check that the selected item
                // is equal to the item in the given index
                TablePosition<S,?> selectedCell = getSelectedCells().get(0);
                if (getSelectedItem() == getModelItem(row)) {
                    if (selectedCell.getRow() == row && selectedCell.getTableColumn() == column) {
                        return;
                    }
                }
            }

            // RT-32411 We used to call quietClearSelection() here, but this
            // resulted in the selectedItems and selectedIndices lists never
            // reporting that they were empty.
            // makeAtomic toggle added to resolve RT-32618
            startAtomic();

            // then clear the current selection
            clearSelection();

            // and select the new cell
            select(row, column);

            stopAtomic();


            // We remove the new selection from the list seeing as it is not removed.
            if (isCellSelectionEnabled) {
                previousSelection.remove(newTablePosition);
            } else {
                for (TablePosition<S,?> tp : previousSelection) {
                    if (tp.getRow() == row) {
                        previousSelection.remove(tp);
                        break;
                    }
                }
            }

            // fire off a single add/remove/replace notification (rather than
            // individual remove and add notifications) - see RT-33324
            ListChangeListener.Change<TablePosition<S, ?>> change;

            /*
             * getFrom() documentation:
             *   If wasAdded is true, the interval contains all the values that were added.
             *   If wasPermutated is true, the interval marks the values that were permutated.
             *   If wasRemoved is true and wasAdded is false, getFrom() and getTo() should
             *   return the same number - the place where the removed elements were positioned in the list.
             */
            if (wasSelected) {
                change = ControlUtils.buildClearAndSelectChange(selectedCellsSeq, previousSelection, row);
            } else {
                final int changeIndex = isCellSelectionEnabled ? 0 : Math.max(0, selectedCellsSeq.indexOf(newTablePosition));
                final int changeSize = isCellSelectionEnabled ? getSelectedCells().size() : 1;
                change = new NonIterableChange.GenericAddRemoveChange<>(
                        changeIndex, changeIndex + changeSize, previousSelection, selectedCellsSeq);
//                selectedCellsSeq._beginChange();
//                selectedCellsSeq._nextAdd(changeIndex, changeIndex + changeSize);
//                selectedCellsSeq._nextRemove(changeIndex, previousSelection);
//                selectedCellsSeq._endChange();
            }
            fireCustomSelectedCellsListChangeEvent(change);
        }

        @Override public void select(int row) {
            select(row, null);
        }

        @Override
        public void select(int row, TableColumn<S,?> column) {
            if (row < 0 || row >= getItemCount()) return;

            // if I'm in cell selection mode but the column is null, select each
            // of the contained cells individually
            if (isCellSelectionEnabled() && column == null) {
                List<TableColumn<S,?>> columns = getTableView().getVisibleLeafColumns();
                for (int i = 0; i < columns.size(); i++) {
                    select(row, columns.get(i));
                }
                return;
            }

            if (TableCellBehavior.hasDefaultAnchor(tableView)) {
                TableCellBehavior.removeAnchor(tableView);
            }

            if (getSelectionMode() == SelectionMode.SINGLE) {
                quietClearSelection();
            }
            selectedCellsMap.add(new TablePosition<>(getTableView(), row, column));

            updateSelectedIndex(row);
            focus(row, column);
        }

        @Override public void select(S obj) {
            if (obj == null && getSelectionMode() == SelectionMode.SINGLE) {
                clearSelection();
                return;
            }

            // We have no option but to iterate through the model and select the
            // first occurrence of the given object. Once we find the first one, we
            // don't proceed to select any others.
            S rowObj = null;
            for (int i = 0; i < getItemCount(); i++) {
                rowObj = getModelItem(i);
                if (rowObj == null) continue;

                if (rowObj.equals(obj)) {
                    if (isSelected(i)) {
                        return;
                    }

                    if (getSelectionMode() == SelectionMode.SINGLE) {
                        quietClearSelection();
                    }

                    select(i);
                    return;
                }
            }

            // if we are here, we did not find the item in the entire data model.
            // Even still, we allow for this item to be set to the give object.
            // We expect that in concrete subclasses of this class we observe the
            // data model such that we check to see if the given item exists in it,
            // whilst SelectedIndex == -1 && SelectedItem != null.
            setSelectedIndex(-1);
            setSelectedItem(obj);
        }

        @Override public void selectIndices(int row, int... rows) {
            if (rows == null) {
                select(row);
                return;
            }

            /*
             * Performance optimisation - if multiple selection is disabled, only
             * process the end-most row index.
             */
            int rowCount = getItemCount();

            if (getSelectionMode() == SelectionMode.SINGLE) {
                quietClearSelection();

                for (int i = rows.length - 1; i >= 0; i--) {
                    int index = rows[i];
                    if (index >= 0 && index < rowCount) {
                        select(index);
                        break;
                    }
                }

                if (selectedCellsMap.isEmpty()) {
                    if (row > 0 && row < rowCount) {
                        select(row);
                    }
                }
            } else {
                int lastIndex = -1;
                Set<TablePosition<S,?>> positions = new LinkedHashSet<>();

                // --- firstly, we special-case the non-varargs 'row' argument
                if (row >= 0 && row < rowCount) {
                    // if I'm in cell selection mode, we want to select each
                    // of the contained cells individually
                    if (isCellSelectionEnabled()) {
                        List<TableColumn<S,?>> columns = getTableView().getVisibleLeafColumns();
                        for (int column = 0; column < columns.size(); column++) {
                            if (! selectedCellsMap.isSelected(row, column)) {
                                positions.add(new TablePosition<>(getTableView(), row, columns.get(column)));
                                lastIndex = row;
                            }
                        }
                    } else {
                        boolean match = selectedCellsMap.isSelected(row, -1);
                        if (!match) {
                            positions.add(new TablePosition<>(getTableView(), row, null));
                        }
                    }

                    lastIndex = row;
                }

                // --- now we iterate through all varargs values
                for (int i = 0; i < rows.length; i++) {
                    int index = rows[i];
                    if (index < 0 || index >= rowCount) continue;
                    lastIndex = index;

                    if (isCellSelectionEnabled()) {
                        List<TableColumn<S,?>> columns = getTableView().getVisibleLeafColumns();
                        for (int column = 0; column < columns.size(); column++) {
                            if (! selectedCellsMap.isSelected(index, column)) {
                                positions.add(new TablePosition<>(getTableView(), index, columns.get(column)));
                                lastIndex = index;
                            }
                        }
                    } else {
                        if (! selectedCellsMap.isSelected(index, -1)) {
                            // if we are here then we have successfully gotten through the for-loop above
                            positions.add(new TablePosition<>(getTableView(), index, null));
                        }
                    }
                }

                selectedCellsMap.addAll(positions);

                if (lastIndex != -1) {
                    select(lastIndex);
                }
            }
        }

        @Override public void selectAll() {
            if (getSelectionMode() == SelectionMode.SINGLE) return;

            if (isCellSelectionEnabled()) {
                List<TablePosition<S,?>> indices = new ArrayList<>();
                TableColumn<S,?> column;
                TablePosition<S,?> tp = null;
                for (int col = 0; col < getTableView().getVisibleLeafColumns().size(); col++) {
                    column = getTableView().getVisibleLeafColumns().get(col);
                    for (int row = 0; row < getItemCount(); row++) {
                        tp = new TablePosition<>(getTableView(), row, column);
                        indices.add(tp);
                    }
                }
                selectedCellsMap.setAll(indices);

                if (tp != null) {
                    select(tp.getRow(), tp.getTableColumn());
                    focus(tp.getRow(), tp.getTableColumn());
                }
            } else {
                List<TablePosition<S,?>> indices = new ArrayList<>();
                for (int i = 0; i < getItemCount(); i++) {
                    indices.add(new TablePosition<>(getTableView(), i, null));
                }
                selectedCellsMap.setAll(indices);

                int focusedIndex = getFocusedIndex();
                if (focusedIndex == -1) {
                    final int itemCount = getItemCount();
                    if (itemCount > 0) {
                        select(itemCount - 1);
                        focus(indices.get(indices.size() - 1));
                    }
                } else {
                    select(focusedIndex);
                    focus(focusedIndex);
                }
            }
        }

        @Override public void selectRange(int minRow, TableColumnBase<S,?> minColumn,
                                          int maxRow, TableColumnBase<S,?> maxColumn) {
            if (getSelectionMode() == SelectionMode.SINGLE) {
                quietClearSelection();
                select(maxRow, maxColumn);
                return;
            }

            startAtomic();

            final int itemCount = getItemCount();
            final boolean isCellSelectionEnabled = isCellSelectionEnabled();

            final int minColumnIndex = tableView.getVisibleLeafIndex((TableColumn<S,?>)minColumn);
            final int maxColumnIndex = tableView.getVisibleLeafIndex((TableColumn<S,?>)maxColumn);
            final int _minColumnIndex = Math.min(minColumnIndex, maxColumnIndex);
            final int _maxColumnIndex = Math.max(minColumnIndex, maxColumnIndex);

            final int _minRow = Math.min(minRow, maxRow);
            final int _maxRow = Math.max(minRow, maxRow);

            List<TablePosition<S,?>> cellsToSelect = new ArrayList<>();

            for (int _row = _minRow; _row <= _maxRow; _row++) {
                // begin copy/paste of select(int, column) method (with some
                // slight modifications)
                if (_row < 0 || _row >= itemCount) continue;

                if (! isCellSelectionEnabled) {
                    cellsToSelect.add(new TablePosition<>(tableView, _row, (TableColumn<S,?>)minColumn));
                } else {
                    for (int _col = _minColumnIndex; _col <= _maxColumnIndex; _col++) {
                        final TableColumn<S, ?> column = tableView.getVisibleLeafColumn(_col);

                        // if I'm in cell selection mode but the column is null, I don't want
                        // to select the whole row instead...
                        if (column == null && isCellSelectionEnabled) continue;

                        cellsToSelect.add(new TablePosition<>(tableView, _row, column));
                        // end copy/paste
                    }
                }
            }

            // to prevent duplication we remove all currently selected cells from
            // our list of cells to select.
            cellsToSelect.removeAll(getSelectedCells());

            selectedCellsMap.addAll(cellsToSelect);
            stopAtomic();

            // fire off events.
            // Note that focus and selection always goes to maxRow, not _maxRow.
            updateSelectedIndex(maxRow);
            focus(maxRow, (TableColumn<S,?>)maxColumn);

            final TableColumn<S,?> startColumn = (TableColumn<S,?>)minColumn;
            final TableColumn<S,?> endColumn = isCellSelectionEnabled ? (TableColumn<S,?>)maxColumn : startColumn;
            final int startChangeIndex = selectedCellsMap.indexOf(new TablePosition<>(tableView, minRow, startColumn));
            final int endChangeIndex = selectedCellsMap.indexOf(new TablePosition<>(tableView, maxRow, endColumn));

            if (startChangeIndex > -1 && endChangeIndex > -1) {
                final int startIndex = Math.min(startChangeIndex, endChangeIndex);
                final int endIndex = Math.max(startChangeIndex, endChangeIndex);

                ListChangeListener.Change c = new NonIterableChange.SimpleAddChange<>(startIndex, endIndex + 1, selectedCellsSeq);
                fireCustomSelectedCellsListChangeEvent(c);
//                selectedCellsSeq.fireChange(() -> selectedCellsSeq._nextAdd(startIndex, endIndex + 1));
            }
        }

        @Override public void clearSelection(int index) {
            clearSelection(index, null);
        }

        @Override
        public void clearSelection(int row, TableColumn<S,?> column) {
            clearSelection(new TablePosition<>(getTableView(), row, column));
        }

        private void clearSelection(TablePosition<S,?> tp) {
            final boolean csMode = isCellSelectionEnabled();
            final int row = tp.getRow();
            final boolean columnIsNull = tp.getTableColumn() == null;

            List<TablePosition> toRemove = new ArrayList<>();
            for (TablePosition pos : getSelectedCells()) {
                if (!csMode) {
                    if (pos.getRow() == row) {
                        toRemove.add(pos);
                        break;
                    }
                } else {
                    if (columnIsNull && pos.getRow() == row) {
                        // if we are in cell selection mode and the column is null,
                        // we remove all items in the row
                        toRemove.add(pos);
                    } else if (pos.equals(tp)) {
                        toRemove.add(tp);
                        break;
                    }
                }
            }
            toRemove.stream().forEach(selectedCellsMap::remove);

            if (isEmpty() && ! isAtomic()) {
                updateSelectedIndex(-1);
                selectedCellsMap.clear();
            }
        }

        @Override public void clearSelection() {
            final List<TablePosition<S,?>> removed = new ArrayList<>((Collection)getSelectedCells());

            quietClearSelection();

            if (! isAtomic()) {
                updateSelectedIndex(-1);
                focus(-1);

                if (!removed.isEmpty()) {
                    ListChangeListener.Change<TablePosition<S, ?>> c = new NonIterableChange<TablePosition<S, ?>>(0, 0, selectedCellsSeq) {
                        @Override public List<TablePosition<S, ?>> getRemoved() {
                            return removed;
                        }
                    };
                    fireCustomSelectedCellsListChangeEvent(c);
//                    selectedCellsSeq.fireChange(() -> selectedCellsSeq._nextRemove(0, removed));
                }
            }
        }

        private void quietClearSelection() {
            startAtomic();
            selectedCellsMap.clear();
            stopAtomic();
        }

        @Override public boolean isSelected(int index) {
            return isSelected(index, null);
        }

        @Override
        public boolean isSelected(int row, TableColumn<S,?> column) {
            // When in cell selection mode, if the column is null, then we interpret
            // the users query to be asking if _all_ of the cells in the row are selected,
            // rather than if _any_ of the cells in the row are selected.
            final boolean isCellSelectionEnabled = isCellSelectionEnabled();
            if (isCellSelectionEnabled && column == null) {
                int columnCount = tableView.getVisibleLeafColumns().size();
                for (int col = 0; col < columnCount; col++) {
                    if (!selectedCellsMap.isSelected(row, col)) {
                        return false;
                    }
                }
                return true;
            } else {
                int columnIndex = !isCellSelectionEnabled || column == null ? -1 : tableView.getVisibleLeafIndex(column);
                return selectedCellsMap.isSelected(row, columnIndex);
            }
        }

        @Override public boolean isEmpty() {
            return selectedCellsMap.isEmpty();
        }

        @Override public void selectPrevious() {
            if (isCellSelectionEnabled()) {
                // in cell selection mode, we have to wrap around, going from
                // right-to-left, and then wrapping to the end of the previous line
                TablePosition<S,?> pos = getFocusedCell();
                if (pos.getColumn() - 1 >= 0) {
                    // go to previous row
                    select(pos.getRow(), getTableColumn(pos.getTableColumn(), -1));
                } else if (pos.getRow() < getItemCount() - 1) {
                    // wrap to end of previous row
                    select(pos.getRow() - 1, getTableColumn(getTableView().getVisibleLeafColumns().size() - 1));
                }
            } else {
                int focusIndex = getFocusedIndex();
                if (focusIndex == -1) {
                    select(getItemCount() - 1);
                } else if (focusIndex > 0) {
                    select(focusIndex - 1);
                }
            }
        }

        @Override public void selectNext() {
            if (isCellSelectionEnabled()) {
                // in cell selection mode, we have to wrap around, going from
                // left-to-right, and then wrapping to the start of the next line
                TablePosition<S,?> pos = getFocusedCell();
                if (pos.getColumn() + 1 < getTableView().getVisibleLeafColumns().size()) {
                    // go to next column
                    select(pos.getRow(), getTableColumn(pos.getTableColumn(), 1));
                } else if (pos.getRow() < getItemCount() - 1) {
                    // wrap to start of next row
                    select(pos.getRow() + 1, getTableColumn(0));
                }
            } else {
                int focusIndex = getFocusedIndex();
                if (focusIndex == -1) {
                    select(0);
                } else if (focusIndex < getItemCount() -1) {
                    select(focusIndex + 1);
                }
            }
        }

        @Override public void selectAboveCell() {
            TablePosition<S,?> pos = getFocusedCell();
            if (pos.getRow() == -1) {
                select(getItemCount() - 1);
            } else if (pos.getRow() > 0) {
                select(pos.getRow() - 1, pos.getTableColumn());
            }
        }

        @Override public void selectBelowCell() {
            TablePosition<S,?> pos = getFocusedCell();

            if (pos.getRow() == -1) {
                select(0);
            } else if (pos.getRow() < getItemCount() -1) {
                select(pos.getRow() + 1, pos.getTableColumn());
            }
        }

        @Override public void selectFirst() {
            TablePosition<S,?> focusedCell = getFocusedCell();

            if (getSelectionMode() == SelectionMode.SINGLE) {
                quietClearSelection();
            }

            if (getItemCount() > 0) {
                if (isCellSelectionEnabled()) {
                    select(0, focusedCell.getTableColumn());
                } else {
                    select(0);
                }
            }
        }

        @Override public void selectLast() {
            TablePosition<S,?> focusedCell = getFocusedCell();

            if (getSelectionMode() == SelectionMode.SINGLE) {
                quietClearSelection();
            }

            int numItems = getItemCount();
            if (numItems > 0 && getSelectedIndex() < numItems - 1) {
                if (isCellSelectionEnabled()) {
                    select(numItems - 1, focusedCell.getTableColumn());
                } else {
                    select(numItems - 1);
                }
            }
        }

        @Override
        public void selectLeftCell() {
            if (! isCellSelectionEnabled()) return;

            TablePosition<S,?> pos = getFocusedCell();
            if (pos.getColumn() - 1 >= 0) {
                select(pos.getRow(), getTableColumn(pos.getTableColumn(), -1));
            }
        }

        @Override
        public void selectRightCell() {
            if (! isCellSelectionEnabled()) return;

            TablePosition<S,?> pos = getFocusedCell();
            if (pos.getColumn() + 1 < getTableView().getVisibleLeafColumns().size()) {
                select(pos.getRow(), getTableColumn(pos.getTableColumn(), 1));
            }
        }



        
                                                                    *
Support code                                                        *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Support code                                                        *
         *                                                                     *
         **********************************************************************/

        private void updateItemsObserver(ObservableList<S> oldList, ObservableList<S> newList) {
            // the items list has changed, we need to observe
            // the new list, and remove any observer we had from the old list
            if (oldList != null) {
                oldList.removeListener(weakItemsContentListener);
            }
            if (newList != null) {
                newList.addListener(weakItemsContentListener);
            }

            updateItemCount();
            updateDefaultSelection();
        }

        private void updateDefaultSelection() {
            // when the items list totally changes, we should clear out
            // the selection
            int newSelectionIndex = -1;
            if (tableView.getItems() != null) {
                S selectedItem = getSelectedItem();
                if (selectedItem != null) {
                    newSelectionIndex = tableView.getItems().indexOf(selectedItem);
                }
            }

            clearSelection();
            select(newSelectionIndex, isCellSelectionEnabled() ? getTableColumn(0) : null);
        }

        private TableColumn<S,?> getTableColumn(int pos) {
            return getTableView().getVisibleLeafColumn(pos);
        }

        // Gets a table column to the left or right of the current one, given an offset
        private TableColumn<S,?> getTableColumn(TableColumn<S,?> column, int offset) {
            int columnIndex = getTableView().getVisibleLeafIndex(column);
            int newColumnIndex = columnIndex + offset;
            return getTableView().getVisibleLeafColumn(newColumnIndex);
        }

        private void updateSelectedIndex(int row) {
            setSelectedIndex(row);
            setSelectedItem(getModelItem(row));
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override protected int getItemCount() {
            return itemCount;
        }

        private void updateItemCount() {
            if (tableView == null) {
                itemCount = -1;
            } else {
                List<S> items = getTableModel();
                itemCount = items == null ? -1 : items.size();
            }
        }

        private void fireCustomSelectedCellsListChangeEvent(ListChangeListener.Change<? extends TablePosition<S,?>> c) {
            ControlUtils.updateSelectedIndices(this, c);

            if (isAtomic()) {
                return;
            }

            selectedCellsSeq.callObservers(new MappingChange<>(c, MappingChange.NOOP_MAP, selectedCellsSeq));
        }
    }




    
A FocusModel with additional functionality to support the requirements of a TableView control. 
See Also:
TableView
Since:
JavaFX 2.0/**
     * A {@link FocusModel} with additional functionality to support the requirements
     * of a TableView control.
     *
     * @see TableView
     * @since JavaFX 2.0
     */
    public static class TableViewFocusModel<S> extends TableFocusModel<S, TableColumn<S, ?>> {

        private final TableView<S> tableView;

        private final TablePosition<S,?> EMPTY_CELL;

        
Creates a default TableViewFocusModel instance that will be used to
manage focus of the provided TableView control.
Params:
tableView – The tableView upon which this focus model operates.
Throws:
NullPointerException – The TableView argument can not be null./**
         * Creates a default TableViewFocusModel instance that will be used to
         * manage focus of the provided TableView control.
         *
         * @param tableView The tableView upon which this focus model operates.
         * @throws NullPointerException The TableView argument can not be null.
         */
        public TableViewFocusModel(final TableView<S> tableView) {
            if (tableView == null) {
                throw new NullPointerException("TableView can not be null");
            }

            this.tableView = tableView;
            this.EMPTY_CELL = new TablePosition<>(tableView, -1, null);

            itemsObserver = new InvalidationListener() {
                private WeakReference<ObservableList<S>> weakItemsRef = new WeakReference<>(tableView.getItems());

                @Override public void invalidated(Observable observable) {
                    ObservableList<S> oldItems = weakItemsRef.get();
                    weakItemsRef = new WeakReference<>(tableView.getItems());
                    updateItemsObserver(oldItems, tableView.getItems());
                }
            };
            this.tableView.itemsProperty().addListener(new WeakInvalidationListener(itemsObserver));
            if (tableView.getItems() != null) {
                this.tableView.getItems().addListener(weakItemsContentListener);
            }

            updateDefaultFocus();

            focusedCellProperty().addListener(o -> {
                tableView.notifyAccessibleAttributeChanged(AccessibleAttribute.FOCUS_ITEM);
            });
        }

        private final InvalidationListener itemsObserver;

        // Listen to changes in the tableview items list, such that when it
        // changes we can update the focused index to refer to the new indices.
        private final ListChangeListener<S> itemsContentListener = c -> {
            c.next();

            if (c.wasReplaced() || c.getAddedSize() == getItemCount()) {
                updateDefaultFocus();
                return;
            }

            TablePosition<S,?> focusedCell = getFocusedCell();
            final int focusedIndex = focusedCell.getRow();
            if (focusedIndex == -1 || c.getFrom() > focusedIndex) {
                return;
            }

            c.reset();
            boolean added = false;
            boolean removed = false;
            int addedSize = 0;
            int removedSize = 0;
            while (c.next()) {
                added |= c.wasAdded();
                removed |= c.wasRemoved();
                addedSize += c.getAddedSize();
                removedSize += c.getRemovedSize();
            }

            if (added && ! removed) {
                if (addedSize < c.getList().size()) {
                    final int newFocusIndex = Math.min(getItemCount() - 1, getFocusedIndex() + addedSize);
                    focus(newFocusIndex, focusedCell.getTableColumn());
                }
            } else if (!added && removed) {
                final int newFocusIndex = Math.max(0, getFocusedIndex() - removedSize);
                if (newFocusIndex < 0) {
                    focus(0, focusedCell.getTableColumn());
                } else {
                    focus(newFocusIndex, focusedCell.getTableColumn());
                }
            }
        };

        private WeakListChangeListener<S> weakItemsContentListener
                = new WeakListChangeListener<>(itemsContentListener);

        private void updateItemsObserver(ObservableList<S> oldList, ObservableList<S> newList) {
            // the tableview items list has changed, we need to observe
            // the new list, and remove any observer we had from the old list
            if (oldList != null) oldList.removeListener(weakItemsContentListener);
            if (newList != null) newList.addListener(weakItemsContentListener);

            updateDefaultFocus();
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override protected int getItemCount() {
            if (tableView.getItems() == null) return -1;
            return tableView.getItems().size();
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override protected S getModelItem(int index) {
            if (tableView.getItems() == null) return null;

            if (index < 0 || index >= getItemCount()) return null;

            return tableView.getItems().get(index);
        }

        
The position of the current item in the TableView which has the focus.
/**
         * The position of the current item in the TableView which has the focus.
         */
        private ReadOnlyObjectWrapper<TablePosition> focusedCell;
        public final ReadOnlyObjectProperty<TablePosition> focusedCellProperty() {
            return focusedCellPropertyImpl().getReadOnlyProperty();
        }
        private void setFocusedCell(TablePosition value) { focusedCellPropertyImpl().set(value);  }
        public final TablePosition getFocusedCell() { return focusedCell == null ? EMPTY_CELL : focusedCell.get(); }

        private ReadOnlyObjectWrapper<TablePosition> focusedCellPropertyImpl() {
            if (focusedCell == null) {
                focusedCell = new ReadOnlyObjectWrapper<TablePosition>(EMPTY_CELL) {
                    private TablePosition old;
                    @Override protected void invalidated() {
                        if (get() == null) return;

                        if (old == null || !old.equals(get())) {
                            setFocusedIndex(get().getRow());
                            setFocusedItem(getModelItem(getValue().getRow()));

                            old = get();
                        }
                    }

                    @Override
                    public Object getBean() {
                        return TableViewFocusModel.this;
                    }

                    @Override
                    public String getName() {
                        return "focusedCell";
                    }
                };
            }
            return focusedCell;
        }


        
Causes the item at the given index to receive the focus.
Params:
row – The row index of the item to give focus to.
column – The column of the item to give focus to. Can be null./**
         * Causes the item at the given index to receive the focus.
         *
         * @param row The row index of the item to give focus to.
         * @param column The column of the item to give focus to. Can be null.
         */
        @Override public void focus(int row, TableColumn<S,?> column) {
            if (row < 0 || row >= getItemCount()) {
                setFocusedCell(EMPTY_CELL);
            } else {
                TablePosition<S,?> oldFocusCell = getFocusedCell();
                TablePosition<S,?> newFocusCell = new TablePosition<>(tableView, row, column);
                setFocusedCell(newFocusCell);

                if (newFocusCell.equals(oldFocusCell)) {
                    // manually update the focus properties to ensure consistency
                    setFocusedIndex(row);
                    setFocusedItem(getModelItem(row));
                }
            }
        }

        
Convenience method for setting focus on a particular row or cell using a TablePosition. 
Params:
pos – The table position where focus should be set./**
         * Convenience method for setting focus on a particular row or cell
         * using a {@link TablePosition}.
         *
         * @param pos The table position where focus should be set.
         */
        public void focus(TablePosition pos) {
            if (pos == null) return;
            focus(pos.getRow(), pos.getTableColumn());
        }


        /***********************************************************************
         *                                                                     *
         * Public API                                                          *
         *                                                                     *
         **********************************************************************/

        
Tests whether the row / cell at the given location currently has the
focus within the TableView.
/**
         * Tests whether the row / cell at the given location currently has the
         * focus within the TableView.
         */
        @Override public boolean isFocused(int row, TableColumn<S,?> column) {
            if (row < 0 || row >= getItemCount()) return false;

            TablePosition cell = getFocusedCell();
            boolean columnMatch = column == null || column.equals(cell.getTableColumn());

            return cell.getRow() == row && columnMatch;
        }

        
Causes the item at the given index to receive the focus. This does not
cause the current selection to change. Updates the focusedItem and
focusedIndex properties such that focusedIndex = -1 unless
0 <= index < model size
.
Params:
index – The index of the item to get focus./**
         * Causes the item at the given index to receive the focus. This does not
         * cause the current selection to change. Updates the focusedItem and
         * focusedIndex properties such that <code>focusedIndex = -1</code> unless
         * <pre><code>0 &lt;= index &lt; model size</code></pre>.
         *
         * @param index The index of the item to get focus.
         */
        @Override public void focus(int index) {
            if (index < 0 || index >= getItemCount()) {
                setFocusedCell(EMPTY_CELL);
            } else {
                setFocusedCell(new TablePosition<>(tableView, index, null));
            }
        }

        
Attempts to move focus to the cell above the currently focused cell.
/**
         * Attempts to move focus to the cell above the currently focused cell.
         */
        @Override public void focusAboveCell() {
            TablePosition cell = getFocusedCell();

            if (getFocusedIndex() == -1) {
                focus(getItemCount() - 1, cell.getTableColumn());
            } else if (getFocusedIndex() > 0) {
                focus(getFocusedIndex() - 1, cell.getTableColumn());
            }
        }

        
Attempts to move focus to the cell below the currently focused cell.
/**
         * Attempts to move focus to the cell below the currently focused cell.
         */
        @Override public void focusBelowCell() {
            TablePosition cell = getFocusedCell();
            if (getFocusedIndex() == -1) {
                focus(0, cell.getTableColumn());
            } else if (getFocusedIndex() != getItemCount() -1) {
                focus(getFocusedIndex() + 1, cell.getTableColumn());
            }
        }

        
Attempts to move focus to the cell to the left of the currently focused cell.
/**
         * Attempts to move focus to the cell to the left of the currently focused cell.
         */
        @Override public void focusLeftCell() {
            TablePosition cell = getFocusedCell();
            if (cell.getColumn() <= 0) return;
            focus(cell.getRow(), getTableColumn(cell.getTableColumn(), -1));
        }

        
Attempts to move focus to the cell to the right of the the currently focused cell.
/**
         * Attempts to move focus to the cell to the right of the the currently focused cell.
         */
        @Override public void focusRightCell() {
            TablePosition cell = getFocusedCell();
            if (cell.getColumn() == getColumnCount() - 1) return;
            focus(cell.getRow(), getTableColumn(cell.getTableColumn(), 1));
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void focusPrevious() {
            if (getFocusedIndex() == -1) {
                focus(0);
            } else if (getFocusedIndex() > 0) {
                focusAboveCell();
            }
        }

        
{@inheritDoc} /** {@inheritDoc} */
        @Override public void focusNext() {
            if (getFocusedIndex() == -1) {
                focus(0);
            } else if (getFocusedIndex() != getItemCount() -1) {
                focusBelowCell();
            }
        }

        
                                                                    *
Private Implementation                                              *
                                                                    *
/***********************************************************************
         *                                                                     *
         * Private Implementation                                              *
         *                                                                     *
         **********************************************************************/

        private void updateDefaultFocus() {
            // when the items list totally changes, we should clear out
            // the focus
            int newValueIndex = -1;
            if (tableView.getItems() != null) {
                S focusedItem = getFocusedItem();
                if (focusedItem != null) {
                    newValueIndex = tableView.getItems().indexOf(focusedItem);
                }

                // we put focus onto the first item, if there is at least
                // one item in the list
                if (newValueIndex == -1) {
                    newValueIndex = tableView.getItems().size() > 0 ? 0 : -1;
                }
            }

            TablePosition<S,?> focusedCell = getFocusedCell();
            TableColumn<S,?> focusColumn = focusedCell != null && !EMPTY_CELL.equals(focusedCell) ?
               focusedCell.getTableColumn() : tableView.getVisibleLeafColumn(0);

            focus(newValueIndex, focusColumn);
        }

        private int getColumnCount() {
            return tableView.getVisibleLeafColumns().size();
        }

        // Gets a table column to the left or right of the current one, given an offset
        private TableColumn<S,?> getTableColumn(TableColumn<S,?> column, int offset) {
            int columnIndex = tableView.getVisibleLeafIndex(column);
            int newColumnIndex = columnIndex + offset;
            return tableView.getVisibleLeafColumn(newColumnIndex);
        }
    }
}