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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package javafx.scene.control.cell;

import static javafx.scene.control.cell.CellUtils.createComboBox;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.TreeTableCell;
import javafx.scene.control.TreeTableColumn;
import javafx.util.Callback;
import javafx.util.StringConverter;


A class containing a TreeTableCell implementation that draws a ComboBox node inside the cell. 
By default, the ComboBoxTreeTableCell is rendered as a Label when not being edited, and as a ComboBox when in editing mode. The ComboBox will, by default, stretch to fill the entire table cell. 
To create a ComboBoxTreeTableCell, it is necessary to provide zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. 
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn.
Since:JavaFX 8.0
/**
 * A class containing a {@link TreeTableCell} implementation that draws a
 * {@link ComboBox} node inside the cell.
 *
 * <p>By default, the ComboBoxTreeTableCell is rendered as a {@link Label} when not
 * being edited, and as a ComboBox when in editing mode. The ComboBox will, by
 * default, stretch to fill the entire table cell.
 *
 * <p>To create a ComboBoxTreeTableCell, it is necessary to provide zero or more
 * items that will be shown to the user when the {@link ComboBox} menu is
 * showing. These items must be of the same type as the TreeTableColumn.
 *
 * @param <S> The type of the TreeTableView generic type
 * @param <T> The type of the elements contained within the TreeTableColumn.
 * @since JavaFX 8.0
 */
public class ComboBoxTreeTableCell<S,T> extends TreeTableCell<S,T> {

    /***************************************************************************
     *                                                                         *
     * Static cell factories                                                   *
     *                                                                         *
     **************************************************************************/

    
Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a Label when not being edited, and as a ComboBox when in editing mode. The ComboBox will, by default, stretch to fill the entire list cell. 
Params:
  • items – Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a ComboBox cell factory for use in {@link TreeTableColumn} controls.
     * By default, the ComboBoxCell is rendered as a {@link Label} when not
     * being edited, and as a ComboBox when in editing mode. The ComboBox will,
     * by default, stretch to fill the entire list cell.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the TreeTableColumn.
     * @param items Zero or more items that will be shown to the user when the
     *      {@link ComboBox} menu is showing. These items must be of the same
     *      type as the TreeTableColumn. Note that it is up to the developer to set
     *      {@link EventHandler event handlers} to listen to edit events in the
     *      TreeTableColumn, and react accordingly. Methods of interest include
     *      {@link TreeTableColumn#setOnEditStart(javafx.event.EventHandler) setOnEditStart},
     *      {@link TreeTableColumn#setOnEditCommit(javafx.event.EventHandler) setOnEditCommit},
     *      and {@link TreeTableColumn#setOnEditCancel(javafx.event.EventHandler) setOnEditCancel}.
     * @return A {@link Callback} that will return a TreeTableCell that is able to
     *      work on the type of element contained within the TreeTableColumn.
     */
    @SafeVarargs
    public static <S,T> Callback<TreeTableColumn<S,T>, TreeTableCell<S,T>> forTreeTableColumn(
            final T... items) {
        return forTreeTableColumn(null, items);
    }

    
Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a Label when not being edited, and as a ComboBox when in editing mode. The ComboBox will, by default, stretch to fill the entire list cell. 
Params:
  • converter – A StringConverter to convert the given item (of type T) to a String for displaying to the user.
  • items – Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a ComboBox cell factory for use in {@link TreeTableColumn} controls.
     * By default, the ComboBoxCell is rendered as a {@link Label} when not
     * being edited, and as a ComboBox when in editing mode. The ComboBox will,
     * by default, stretch to fill the entire list cell.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the TreeTableColumn.
     * @param converter A {@link StringConverter} to convert the given item (of
     *      type T) to a String for displaying to the user.
     * @param items Zero or more items that will be shown to the user when the
     *      {@link ComboBox} menu is showing. These items must be of the same
     *      type as the TreeTableColumn. Note that it is up to the developer to set
     *      {@link EventHandler event handlers} to listen to edit events in the
     *      TreeTableColumn, and react accordingly. Methods of interest include
     *      {@link TreeTableColumn#setOnEditStart(javafx.event.EventHandler) setOnEditStart},
     *      {@link TreeTableColumn#setOnEditCommit(javafx.event.EventHandler) setOnEditCommit},
     *      and {@link TreeTableColumn#setOnEditCancel(javafx.event.EventHandler) setOnEditCancel}.
     * @return A {@link Callback} that will return a TreeTableCell that is able to
     *      work on the type of element contained within the TreeTableColumn.
     */
    @SafeVarargs
    public static <S,T> Callback<TreeTableColumn<S,T>, TreeTableCell<S,T>> forTreeTableColumn(
            final StringConverter<T> converter,
            final T... items) {
        return forTreeTableColumn(converter, FXCollections.observableArrayList(items));
    }

    
Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a Label when not being edited, and as a ComboBox when in editing mode. The ComboBox will, by default, stretch to fill the entire list cell. 
Params:
  • items – Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a ComboBox cell factory for use in {@link TreeTableColumn} controls.
     * By default, the ComboBoxCell is rendered as a {@link Label} when not
     * being edited, and as a ComboBox when in editing mode. The ComboBox will,
     * by default, stretch to fill the entire list cell.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the TreeTableColumn.
     * @param items Zero or more items that will be shown to the user when the
     *      {@link ComboBox} menu is showing. These items must be of the same
     *      type as the TreeTableColumn. Note that it is up to the developer to set
     *      {@link EventHandler event handlers} to listen to edit events in the
     *      TreeTableColumn, and react accordingly. Methods of interest include
     *      {@link TreeTableColumn#setOnEditStart(javafx.event.EventHandler) setOnEditStart},
     *      {@link TreeTableColumn#setOnEditCommit(javafx.event.EventHandler) setOnEditCommit},
     *      and {@link TreeTableColumn#setOnEditCancel(javafx.event.EventHandler) setOnEditCancel}.
     * @return A {@link Callback} that will return a TreeTableCell that is able to
     *      work on the type of element contained within the TreeTableColumn.
     */
    public static <S,T> Callback<TreeTableColumn<S,T>, TreeTableCell<S,T>> forTreeTableColumn(
            final ObservableList<T> items) {
        return forTreeTableColumn(null, items);
    }

    
Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a Label when not being edited, and as a ComboBox when in editing mode. The ComboBox will, by default, stretch to fill the entire list cell. 
Params:
  • converter – A StringConverter to convert the given item (of type T) to a String for displaying to the user.
  • items – Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a ComboBox cell factory for use in {@link TreeTableColumn} controls.
     * By default, the ComboBoxCell is rendered as a {@link Label} when not
     * being edited, and as a ComboBox when in editing mode. The ComboBox will,
     * by default, stretch to fill the entire list cell.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the TreeTableColumn.
     * @param converter A {@link StringConverter} to convert the given item (of
     *      type T) to a String for displaying to the user.
     * @param items Zero or more items that will be shown to the user when the
     *      {@link ComboBox} menu is showing. These items must be of the same
     *      type as the TreeTableColumn. Note that it is up to the developer to set
     *      {@link EventHandler event handlers} to listen to edit events in the
     *      TreeTableColumn, and react accordingly. Methods of interest include
     *      {@link TreeTableColumn#setOnEditStart(javafx.event.EventHandler) setOnEditStart},
     *      {@link TreeTableColumn#setOnEditCommit(javafx.event.EventHandler) setOnEditCommit},
     *      and {@link TreeTableColumn#setOnEditCancel(javafx.event.EventHandler) setOnEditCancel}.
     * @return A {@link Callback} that will return a TreeTableCell that is able to
     *      work on the type of element contained within the TreeTableColumn.
     */
    public static <S,T> Callback<TreeTableColumn<S,T>, TreeTableCell<S,T>> forTreeTableColumn(
            final StringConverter<T> converter,
            final ObservableList<T> items) {
        return list -> new ComboBoxTreeTableCell<S,T>(converter, items);
    }



    
                                                                        *
Fields                                                                  *
                                                                        *

/***************************************************************************
     *                                                                         *
     * Fields                                                                  *
     *                                                                         *
     **************************************************************************/

    private final ObservableList<T> items;

    private ComboBox<T> comboBox;



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

    
Creates a default ComboBoxTreeTableCell with an empty items list.

/**
     * Creates a default ComboBoxTreeTableCell with an empty items list.
     */
    public ComboBoxTreeTableCell() {
        this(FXCollections.<T>observableArrayList());
    }

    
Creates a default ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown. 
Params:
  • items – The items to show in the ComboBox popup menu when selected
     by the user.
/**
     * Creates a default {@link ComboBoxTreeTableCell} instance with the given items
     * being used to populate the {@link ComboBox} when it is shown.
     *
     * @param items The items to show in the ComboBox popup menu when selected
     *      by the user.
     */
    @SafeVarargs
    public ComboBoxTreeTableCell(T... items) {
        this(FXCollections.observableArrayList(items));
    }

    
Creates a ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown, and the StringConverter being used to convert the item in to a user-readable form. 
Params:
  • converter – A StringConverter that can convert an item of type T into a user-readable string so that it may then be shown in the ComboBox popup menu.
  • items – The items to show in the ComboBox popup menu when selected
     by the user.
/**
     * Creates a {@link ComboBoxTreeTableCell} instance with the given items
     * being used to populate the {@link ComboBox} when it is shown, and the
     * {@link StringConverter} being used to convert the item in to a
     * user-readable form.
     *
     * @param converter A {@link StringConverter} that can convert an item of type T
     *      into a user-readable string so that it may then be shown in the
     *      ComboBox popup menu.
     * @param items The items to show in the ComboBox popup menu when selected
     *      by the user.
     */
    @SafeVarargs
    public ComboBoxTreeTableCell(StringConverter<T> converter, T... items) {
        this(converter, FXCollections.observableArrayList(items));
    }

    
Creates a default ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown. 
Params:
  • items – The items to show in the ComboBox popup menu when selected
     by the user.
/**
     * Creates a default {@link ComboBoxTreeTableCell} instance with the given items
     * being used to populate the {@link ComboBox} when it is shown.
     *
     * @param items The items to show in the ComboBox popup menu when selected
     *      by the user.
     */
    public ComboBoxTreeTableCell(ObservableList<T> items) {
        this(null, items);
    }

    
Creates a ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown, and the StringConverter being used to convert the item in to a user-readable form. 
Params:
  • converter – A StringConverter that can convert an item of type T into a user-readable string so that it may then be shown in the ComboBox popup menu.
  • items – The items to show in the ComboBox popup menu when selected
     by the user.
/**
     * Creates a {@link ComboBoxTreeTableCell} instance with the given items
     * being used to populate the {@link ComboBox} when it is shown, and the
     * {@link StringConverter} being used to convert the item in to a
     * user-readable form.
     *
     * @param converter A {@link StringConverter} that can convert an item of type T
     *      into a user-readable string so that it may then be shown in the
     *      ComboBox popup menu.
     * @param items The items to show in the ComboBox popup menu when selected
     *      by the user.
     */
    public ComboBoxTreeTableCell(StringConverter<T> converter, ObservableList<T> items) {
        this.getStyleClass().add("combo-box-tree-table-cell");
        this.items = items;
        setConverter(converter != null ? converter : CellUtils.<T>defaultStringConverter());
    }



    
                                                                        *
Properties                                                              *
                                                                        *

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

    // --- converter
    private ObjectProperty<StringConverter<T>> converter =
            new SimpleObjectProperty<StringConverter<T>>(this, "converter");

    
The StringConverter property. 
Returns:the string converter property
/**
     * The {@link StringConverter} property.
     * @return the string converter property
     */
    public final ObjectProperty<StringConverter<T>> converterProperty() {
        return converter;
    }

    
Sets the StringConverter to be used in this cell. 
Params:
  • value – the string converter
/**
     * Sets the {@link StringConverter} to be used in this cell.
     * @param value the string converter
     */
    public final void setConverter(StringConverter<T> value) {
        converterProperty().set(value);
    }

    
Returns the StringConverter used in this cell. 
Returns:the string converter
/**
     * Returns the {@link StringConverter} used in this cell.
     * @return the string converter
     */
    public final StringConverter<T> getConverter() {
        return converterProperty().get();
    }


    // --- comboBox editable
    private BooleanProperty comboBoxEditable =
            new SimpleBooleanProperty(this, "comboBoxEditable");

    
A property representing whether the ComboBox, when shown to the user,
is editable or not.

Returns:the property representing whether the ComboBox, when shown to the
user, is editable or not
/**
     * A property representing whether the ComboBox, when shown to the user,
     * is editable or not.
     * @return the property representing whether the ComboBox, when shown to the
     * user, is editable or not
     */
    public final BooleanProperty comboBoxEditableProperty() {
        return comboBoxEditable;
    }

    
Configures the ComboBox to be editable (to allow user input outside of the
options provide in the dropdown list).

Params:
  • value – the editable value to be set for this ComboBox
/**
     * Configures the ComboBox to be editable (to allow user input outside of the
     * options provide in the dropdown list).
     * @param value the editable value to be set for this ComboBox
     */
    public final void setComboBoxEditable(boolean value) {
        comboBoxEditableProperty().set(value);
    }

    
Returns true if the ComboBox is editable.

Returns:true if the ComboBox is editable
/**
     * Returns true if the ComboBox is editable.
     * @return true if the ComboBox is editable
     */
    public final boolean isComboBoxEditable() {
        return comboBoxEditableProperty().get();
    }



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

    
Returns the items to be displayed in the ComboBox when it is showing.

Returns:the items to be displayed in this ComboBox when it is showing
/**
     * Returns the items to be displayed in the ComboBox when it is showing.
     * @return the items to be displayed in this ComboBox when it is showing
     */
    public ObservableList<T> getItems() {
        return items;
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    @Override public void startEdit() {
        if (! isEditable() || ! getTreeTableView().isEditable() || ! getTableColumn().isEditable()) {
            return;
        }

        if (comboBox == null) {
            comboBox = createComboBox(this, items, converterProperty());
            comboBox.editableProperty().bind(comboBoxEditableProperty());
        }

        comboBox.getSelectionModel().select(getItem());

        super.startEdit();
        setText(null);
        setGraphic(comboBox);
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    @Override public void cancelEdit() {
        super.cancelEdit();

        setText(getConverter().toString(getItem()));
        setGraphic(null);
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    @Override public void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);
        CellUtils.updateItem(this, getConverter(), null, null, comboBox);
    }
}