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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package javafx.scene.control.cell;

import javafx.beans.binding.Bindings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Pos;
import javafx.scene.control.CheckBox;
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 CheckBox node inside the cell, optionally with a label to indicate what the checkbox represents. 
By default, the CheckBoxTreeTableCell is rendered with a CheckBox centred in the TreeTableColumn. If a label is required, it is necessary to provide a non-null StringConverter instance to the CheckBoxTreeTableCell(Callback, StringConverter) constructor. 
To construct an instance of this class, it is necessary to provide a Callback that, given an object of type T, will return an ObservableProperty<Boolean> that represents whether the given item is selected or not. This ObservableValue will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue, if it changes externally). 
Note that the CheckBoxTreeTableCell renders the CheckBox 'live', meaning that the CheckBox is always interactive and can be directly toggled by the user. This means that it is not necessary that the cell enter its editing state (usually by the user double-clicking on the cell). A side-effect of this is that the usual editing callbacks (such as on edit commit) will not be called. If you want to be notified of changes,
it is recommended to directly observe the boolean properties that are
manipulated by the CheckBox.


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 CheckBox} node inside the cell, optionally with a label to indicate
 * what the checkbox represents.
 *
 * <p>By default, the CheckBoxTreeTableCell is rendered with a CheckBox centred in
 * the TreeTableColumn. If a label is required, it is necessary to provide a
 * non-null StringConverter instance to the
 * {@link #CheckBoxTreeTableCell(Callback, StringConverter)} constructor.
 *
 * <p>To construct an instance of this class, it is necessary to provide a
 * {@link Callback} that, given an object of type T, will return an
 * {@code ObservableProperty<Boolean>} that represents whether the given item is
 * selected or not. This ObservableValue will be bound bidirectionally (meaning
 * that the CheckBox in the cell will set/unset this property based on user
 * interactions, and the CheckBox will reflect the state of the ObservableValue,
 * if it changes externally).
 *
 * <p>Note that the CheckBoxTreeTableCell renders the CheckBox 'live', meaning that
 * the CheckBox is always interactive and can be directly toggled by the user.
 * This means that it is not necessary that the cell enter its
 * {@link #editingProperty() editing state} (usually by the user double-clicking
 * on the cell). A side-effect of this is that the usual editing callbacks
 * (such as {@link javafx.scene.control.TreeTableColumn#onEditCommitProperty() on edit commit})
 * will <strong>not</strong> be called. If you want to be notified of changes,
 * it is recommended to directly observe the boolean properties that are
 * manipulated by the CheckBox.</p>
 *
 * @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 CheckBoxTreeTableCell<S,T> extends TreeTableCell<S,T> {

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

    
Creates a cell factory for use in a TreeTableColumn cell factory. This method requires that the TreeTableColumn be of type Boolean. 
When used in a TreeTableColumn, the CheckBoxCell is rendered with a
CheckBox centered in the column.

The ObservableValue<Boolean> contained within each cell in the column will be bound bidirectionally. This means that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally). 
Params:
  • column – the TreeTableColumn of type Boolean
Type parameters:
  • <S> – The type of the TreeTableView generic type
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a cell factory for use in a {@link TreeTableColumn} cell factory.
     * This method requires that the TreeTableColumn be of type {@link Boolean}.
     *
     * <p>When used in a TreeTableColumn, the CheckBoxCell is rendered with a
     * CheckBox centered in the column.
     *
     * <p>The {@code ObservableValue<Boolean>} contained within each cell in the
     * column will be bound bidirectionally. This means that the  CheckBox in
     * the cell will set/unset this property based on user interactions, and the
     * CheckBox will reflect the state of the {@code ObservableValue<Boolean>},
     * if it changes externally).
     *
     * @param <S> The type of the TreeTableView generic type
     * @param column the TreeTableColumn of type {@link Boolean}
     * @return A {@link Callback} that will return a {@link TreeTableCell} that is
     *      able to work on the type of element contained within the TreeTableColumn.
     */
    public static <S> Callback<TreeTableColumn<S,Boolean>, TreeTableCell<S,Boolean>> forTreeTableColumn(
            final TreeTableColumn<S, Boolean> column) {
        return forTreeTableColumn(null, null);
    }

    
Creates a cell factory for use in a TreeTableColumn cell factory. This method requires that the TreeTableColumn be of type ObservableValue<Boolean>. 
When used in a TreeTableColumn, the CheckBoxCell is rendered with a
CheckBox centered in the column.

Params:
  • getSelectedProperty – A Callback that, given an object of type TreeTableColumn<S,T>, will return an ObservableValue<Boolean> that represents whether the given item is selected or not. This ObservableValue<Boolean> will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn instance.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a cell factory for use in a {@link TreeTableColumn} cell factory.
     * This method requires that the TreeTableColumn be of type
     * {@code ObservableValue<Boolean>}.
     *
     * <p>When used in a TreeTableColumn, the CheckBoxCell is rendered with a
     * CheckBox centered in the column.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the {@link TreeTableColumn}
     *      instance.
     * @param getSelectedProperty A Callback that, given an object of
     *      type {@code TreeTableColumn<S,T>}, will return an
     *      {@code ObservableValue<Boolean>}
     *      that represents whether the given item is selected or not. This
     *      {@code ObservableValue<Boolean>} will be bound bidirectionally
     *      (meaning that the CheckBox in the cell will set/unset this property
     *      based on user interactions, and the CheckBox will reflect the state of
     *      the {@code ObservableValue<Boolean>}, if it changes externally).
     * @return A {@link Callback} that will return a {@link 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 Callback<Integer, ObservableValue<Boolean>> getSelectedProperty) {
        return forTreeTableColumn(getSelectedProperty, null);
    }

    
Creates a cell factory for use in a TreeTableColumn cell factory. This method requires that the TreeTableColumn be of type ObservableValue<Boolean>. 
When used in a TreeTableColumn, the CheckBoxCell is rendered with a
CheckBox centered in the column.

Params:
  • getSelectedProperty – A Callback that, given an object of type TreeTableColumn<S,T>, will return an ObservableValue<Boolean> that represents whether the given item is selected or not. This ObservableValue<Boolean> will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).
  • showLabel – In some cases, it may be desirable to show a label in the TreeTableCell beside the CheckBox. By default a label is not shown, but by setting this to true the item in the cell will also have toString() called on it. If this is not the desired behavior, consider using forTreeTableColumn(Callback<Integer,ObservableValue<Boolean>>, StringConverter<Object>), which allows for you to provide a callback that specifies the label for a given row item.
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn instance.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a cell factory for use in a {@link TreeTableColumn} cell factory.
     * This method requires that the TreeTableColumn be of type
     * {@code ObservableValue<Boolean>}.
     *
     * <p>When used in a TreeTableColumn, the CheckBoxCell is rendered with a
     * CheckBox centered in the column.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the {@link TreeTableColumn}
     *      instance.
     * @param getSelectedProperty A Callback that, given an object of
     *      type {@code TreeTableColumn<S,T>}, will return an
     *      {@code ObservableValue<Boolean>}
     *      that represents whether the given item is selected or not. This
     *      {@code ObservableValue<Boolean>} will be bound bidirectionally
     *      (meaning that the CheckBox in the cell will set/unset this property
     *      based on user interactions, and the CheckBox will reflect the state of
     *      the {@code ObservableValue<Boolean>}, if it changes externally).
     * @param showLabel In some cases, it may be desirable to show a label in
     *      the TreeTableCell beside the {@link CheckBox}. By default a label is not
     *      shown, but by setting this to true the item in the cell will also
     *      have toString() called on it. If this is not the desired behavior,
     *      consider using
     *      {@link #forTreeTableColumn(javafx.util.Callback, javafx.util.StringConverter) },
     *      which allows for you to provide a callback that specifies the label for a
     *      given row item.
     * @return A {@link Callback} that will return a {@link 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 Callback<Integer, ObservableValue<Boolean>> getSelectedProperty,
            final boolean showLabel) {
        StringConverter<T> converter = ! showLabel ?
                null : CellUtils.<T>defaultStringConverter();
        return forTreeTableColumn(getSelectedProperty, converter);
    }

    
Creates a cell factory for use in a TreeTableColumn cell factory. This method requires that the TreeTableColumn be of type ObservableValue<Boolean>. 
When used in a TreeTableColumn, the CheckBoxCell is rendered with a
CheckBox centered in the column.

Params:
  • getSelectedProperty – A Callback that, given an object of type TreeTableColumn<S,T>, will return an ObservableValue<Boolean> that represents whether the given item is selected or not. This ObservableValue<Boolean> will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).
  • converter – A StringConverter that, give an object of type T, will return a String that can be used to represent the object visually. The default implementation in forTreeTableColumn(Callback<Integer,ObservableValue<Boolean>>, boolean) (when showLabel is true) is to simply call .toString() on all non-null items (and to just return an empty string in cases where the given item is null).
Type parameters:
  • <S> – The type of the TreeTableView generic type
  • <T> – The type of the elements contained within the TreeTableColumn instance.
Returns:A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.
/**
     * Creates a cell factory for use in a {@link TreeTableColumn} cell factory.
     * This method requires that the TreeTableColumn be of type
     * {@code ObservableValue<Boolean>}.
     *
     * <p>When used in a TreeTableColumn, the CheckBoxCell is rendered with a
     * CheckBox centered in the column.
     *
     * @param <S> The type of the TreeTableView generic type
     * @param <T> The type of the elements contained within the {@link TreeTableColumn}
     *      instance.
     * @param getSelectedProperty A Callback that, given an object of type
     *      {@code TreeTableColumn<S,T>}, will return an
     *      {@code ObservableValue<Boolean>} that represents whether the given
     *      item is selected or not. This {@code ObservableValue<Boolean>} will
     *      be bound bidirectionally (meaning that the CheckBox in the cell will
     *      set/unset this property based on user interactions, and the CheckBox
     *      will reflect the state of the {@code ObservableValue<Boolean>}, if
     *      it changes externally).
     * @param converter A StringConverter that, give an object of type T, will return a
     *      String that can be used to represent the object visually. The default
     *      implementation in {@link #forTreeTableColumn(Callback, boolean)} (when
     *      showLabel is true) is to simply call .toString() on all non-null
     *      items (and to just return an empty string in cases where the given
     *      item is null).
     * @return A {@link Callback} that will return a {@link 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 Callback<Integer, ObservableValue<Boolean>> getSelectedProperty,
            final StringConverter<T> converter) {
        return list -> new CheckBoxTreeTableCell<S,T>(getSelectedProperty, converter);
    }



    
                                                                        *
Fields                                                                  *
                                                                        *

/***************************************************************************
     *                                                                         *
     * Fields                                                                  *
     *                                                                         *
     **************************************************************************/
    private final CheckBox checkBox;

    private boolean showLabel;

    private ObservableValue<Boolean> booleanProperty;



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

    
Creates a default CheckBoxTreeTableCell.

/**
     * Creates a default CheckBoxTreeTableCell.
     */
    public CheckBoxTreeTableCell() {
        this(null, null);
    }

    
Creates a default CheckBoxTreeTableCell with a custom Callback to retrieve an ObservableValue for a given cell index. 
Params:
/**
     * Creates a default CheckBoxTreeTableCell with a custom {@link Callback} to
     * retrieve an ObservableValue for a given cell index.
     *
     * @param getSelectedProperty A {@link Callback} that will return an {@link
     *      ObservableValue} given an index from the TreeTableColumn.
     */
    public CheckBoxTreeTableCell(
            final Callback<Integer, ObservableValue<Boolean>> getSelectedProperty) {
        this(getSelectedProperty, null);
    }

    
Creates a CheckBoxTreeTableCell with a custom string converter.

Params:
  • getSelectedProperty – A Callback that will return a ObservableValue given an index from the TreeTableColumn.
  • converter – A StringConverter that, given an object of type T, will return a
     String that can be used to represent the object visually.
/**
     * Creates a CheckBoxTreeTableCell with a custom string converter.
     *
     * @param getSelectedProperty A {@link Callback} that will return a {@link
     *      ObservableValue} given an index from the TreeTableColumn.
     * @param converter A StringConverter that, given an object of type T, will return a
     *      String that can be used to represent the object visually.
     */
    public CheckBoxTreeTableCell(
            final Callback<Integer, ObservableValue<Boolean>> getSelectedProperty,
            final StringConverter<T> converter) {
        // we let getSelectedProperty be null here, as we can always defer to the
        // TreeTableColumn
        this.getStyleClass().add("check-box-tree-table-cell");

        this.checkBox = new CheckBox();

        // by default the graphic is null until the cell stops being empty
        setGraphic(null);

        setSelectedStateCallback(getSelectedProperty);
        setConverter(converter);

//        // alignment is styleable through css. Calling setAlignment
//        // makes it look to css like the user set the value and css will not
//        // override. Initializing alignment by calling set on the
//        // CssMetaData ensures that css will be able to override the value.
//        final CssMetaData prop = CssMetaData.getCssMetaData(alignmentProperty());
//        prop.set(this, Pos.CENTER);
    }


    
                                                                        *
Properties                                                              *
                                                                        *

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

    // --- converter
    private ObjectProperty<StringConverter<T>> converter =
            new SimpleObjectProperty<StringConverter<T>>(this, "converter") {
        protected void invalidated() {
            updateShowLabel();
        }
    };

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

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

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



    // --- selected state callback property
    private ObjectProperty<Callback<Integer, ObservableValue<Boolean>>>
            selectedStateCallback =
            new SimpleObjectProperty<Callback<Integer, ObservableValue<Boolean>>>(
            this, "selectedStateCallback");

    
Property representing the Callback that is bound to by the CheckBox shown on screen. 
Returns:the property representing the Callback that is bound to by the CheckBox shown on screen
/**
     * Property representing the {@link Callback} that is bound to by the
     * CheckBox shown on screen.
     * @return the property representing the {@link Callback} that is bound to
     * by the CheckBox shown on screen
     */
    public final ObjectProperty<Callback<Integer, ObservableValue<Boolean>>> selectedStateCallbackProperty() {
        return selectedStateCallback;
    }

    
Sets the Callback that is bound to by the CheckBox shown on screen. 
Params:
  • value – the Callback that is bound to by the CheckBox shown on screen
/**
     * Sets the {@link Callback} that is bound to by the CheckBox shown on screen.
     * @param value the {@link Callback} that is bound to by the CheckBox shown
     * on screen
     */
    public final void setSelectedStateCallback(Callback<Integer, ObservableValue<Boolean>> value) {
        selectedStateCallbackProperty().set(value);
    }

    
Returns the Callback that is bound to by the CheckBox shown on screen. 
Returns:the Callback that is bound to by the CheckBox shown on screen
/**
     * Returns the {@link Callback} that is bound to by the CheckBox shown on screen.
     * @return the {@link Callback} that is bound to by the CheckBox shown on
     * screen
     */
    public final Callback<Integer, ObservableValue<Boolean>> getSelectedStateCallback() {
        return selectedStateCallbackProperty().get();
    }



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

    
{@inheritDoc} 
/** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    @Override public void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);

        if (empty) {
            setText(null);
            setGraphic(null);
        } else {
            StringConverter<T> c = getConverter();

            if (showLabel) {
                setText(c.toString(item));
            }
            setGraphic(checkBox);

            if (booleanProperty instanceof BooleanProperty) {
                checkBox.selectedProperty().unbindBidirectional((BooleanProperty)booleanProperty);
            }
            ObservableValue<?> obsValue = getSelectedProperty();
            if (obsValue instanceof BooleanProperty) {
                booleanProperty = (ObservableValue<Boolean>) obsValue;
                checkBox.selectedProperty().bindBidirectional((BooleanProperty)booleanProperty);
            }

            checkBox.disableProperty().bind(Bindings.not(
                    getTreeTableView().editableProperty().and(
                    getTableColumn().editableProperty()).and(
                    editableProperty())
                ));
        }
    }



    
                                                                        *
Private implementation                                                  *
                                                                        *

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

    private void updateShowLabel() {
        this.showLabel = converter != null;
        this.checkBox.setAlignment(showLabel ? Pos.CENTER_LEFT : Pos.CENTER);
    }

    private ObservableValue<?> getSelectedProperty() {
        return getSelectedStateCallback() != null ?
                getSelectedStateCallback().call(getIndex()) :
                getTableColumn().getCellObservableValue(getIndex());
    }
}