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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * accompanied this code).
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package javafx.scene.control.cell;

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.scene.Node;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.util.Callback;
import javafx.util.StringConverter;
import static javafx.scene.control.cell.CellUtils.createComboBox;


A class containing a TreeCell implementation that draws a ComboBox node inside the cell. 
By default, the ComboBoxTreeCell 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 tree cell. 
To create a ComboBoxTreeCell, 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 TreeView TreeItems, such that upon selection, they replace the existing value in the TreeItem.valueProperty(). 
Type parameters:
  • <T> – The type of the TreeItems contained within the TreeView.
Since:JavaFX 2.2
/**
 * A class containing a {@link TreeCell} implementation that draws a
 * {@link ComboBox} node inside the cell.
 *
 * <p>By default, the ComboBoxTreeCell 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 tree cell.
 *
 * <p>To create a ComboBoxTreeCell, 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 TreeView TreeItems, such
 * that upon selection, they replace the existing value in the
 * {@link TreeItem#valueProperty()}.
 *
 * @param <T> The type of the TreeItems contained within the TreeView.
 * @since JavaFX 2.2
 */
public class ComboBoxTreeCell<T> extends DefaultTreeCell<T> {

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

    
Creates a ComboBox cell factory for use in TreeView 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 tree 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 TreeView<T>, such that upon selection, they replace the existing value in the TreeItem value property.
Type parameters:
  • <T> – The type of the elements contained within the TreeView.
Returns:A Callback that will return a TreeCell that is able to work on the type of element contained within the TreeView.
/**
     * Creates a ComboBox cell factory for use in {@link TreeView} 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 tree cell.
     *
     * @param <T> The type of the elements contained within the TreeView.
     * @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 {@literal TreeView<T>}, such that upon selection, they replace the
     *      existing value in the TreeItem {@link TreeItem#valueProperty() value}
     *      property.
     * @return A {@link Callback} that will return a TreeCell that is able to
     *      work on the type of element contained within the TreeView.
     */
    @SafeVarargs
    public static <T> Callback<TreeView<T>, TreeCell<T>> forTreeView(T... items) {
        return forTreeView(FXCollections.observableArrayList(items));
    }

    
Creates a ComboBox cell factory for use in TreeView 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 tree cell, excluding the space allocated to the tree cell indentation and disclosure node(i.e. the arrow). 
Params:
  • items – An ObservableList containing 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 TreeView generic type, such that upon selection, they replace the existing value in the TreeItem that is being edited (as noted in the TreeView.editingItemProperty().
Type parameters:
  • <T> – The type of the TreeItem elements contained within the TreeView.
Returns:A Callback that will return a TreeCell that is able to work on the type of element contained within the TreeView.
/**
     * Creates a ComboBox cell factory for use in {@link TreeView} 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 tree cell, excluding the space
     * allocated to the tree cell indentation and disclosure node(i.e. the arrow).
     *
     * @param <T> The type of the {@link TreeItem} elements contained within the
     *      TreeView.
     * @param items An {@link ObservableList} containing 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 TreeView generic type,
     *      such that upon selection, they replace the existing value in the
     *      {@link TreeItem} that is being edited (as noted in the
     *      {@link TreeView#editingItemProperty()}.
     * @return A {@link Callback} that will return a TreeCell that is able to
     *      work on the type of element contained within the TreeView.
     */
    public static <T> Callback<TreeView<T>, TreeCell<T>> forTreeView(
            final ObservableList<T> items) {
        return forTreeView(null, items);
    }

    
Creates a ComboBox cell factory for use in TreeView 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 tree 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 TreeView<T>, such that upon selection, they replace the existing value in the TreeItem value property.
Type parameters:
  • <T> – The type of the elements contained within the TreeView.
Returns:A Callback that will return a TreeCell that is able to work on the type of element contained within the TreeView.
/**
     * Creates a ComboBox cell factory for use in {@link TreeView} 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 tree cell.
     *
     * @param <T> The type of the elements contained within the TreeView.
     * @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 {@literal TreeView<T>}, such that upon selection, they replace the
     *      existing value in the TreeItem {@link TreeItem#valueProperty() value}
     *      property.
     * @return A {@link Callback} that will return a TreeCell that is able to
     *      work on the type of element contained within the TreeView.
     */
    @SafeVarargs
    public static <T> Callback<TreeView<T>, TreeCell<T>> forTreeView(
            final StringConverter<T> converter,
            final T... items) {
        return forTreeView(converter, FXCollections.observableArrayList(items));
    }

    
Creates a ComboBox cell factory for use in TreeView 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 tree cell. 
Params:
  • converter – A StringConverter to convert the given item (of type T) to a String for displaying to the user.
  • items – An ObservableList containing 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 TreeView generic type, such that upon selection, they replace the existing value in the TreeItem that is being edited (as noted in the TreeView.editingItemProperty().
Type parameters:
  • <T> – The type of the elements contained within the TreeView.
Returns:A Callback that will return a TreeCell that is able to work on the type of element contained within the TreeView.
/**
     * Creates a ComboBox cell factory for use in {@link TreeView} 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 tree cell.
     *
     * @param <T> The type of the elements contained within the TreeView.
     * @param converter A {@link StringConverter} to convert the given item (of
     *      type T) to a String for displaying to the user.
     * @param items An {@link ObservableList} containing 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 TreeView generic type,
     *      such that upon selection, they replace the existing value in the
     *      {@link TreeItem} that is being edited (as noted in the
     *      {@link TreeView#editingItemProperty()}.
     * @return A {@link Callback} that will return a TreeCell that is able to
     *      work on the type of element contained within the TreeView.
     */
    public static <T> Callback<TreeView<T>, TreeCell<T>> forTreeView(
            final StringConverter<T> converter,
            final ObservableList<T> items) {
        return list -> new ComboBoxTreeCell<T>(converter, items);
    }



    
                                                                        *
Fields                                                                  *
                                                                        *

/***************************************************************************
     *                                                                         *
     * Fields                                                                  *
     *                                                                         *
     **************************************************************************/
    private final ObservableList<T> items;

    private ComboBox<T> comboBox;
    private HBox hbox;



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

    
Creates a default ComboBoxTreeCell with an empty items list.

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

    
Creates a default ComboBoxTreeCell 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 ComboBoxTreeCell} 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 ComboBoxTreeCell(T... items) {
        this(FXCollections.observableArrayList(items));
    }

    
Creates a ComboBoxTreeCell 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 ComboBoxTreeCell} 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 ComboBoxTreeCell(StringConverter<T> converter, T... items) {
        this(converter, FXCollections.observableArrayList(items));
    }

    
Creates a default ComboBoxTreeCell 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 ComboBoxTreeCell} 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 ComboBoxTreeCell(ObservableList<T> items) {
        this(null, items);
    }

    
Creates a ComboBoxTreeCell 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 ComboBoxTreeCell} 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 ComboBoxTreeCell(StringConverter<T> converter, ObservableList<T> items) {
        this.getStyleClass().add("combo-box-tree-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 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();
    }


    // --- 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() || ! getTreeView().isEditable()) {
            return;
        }

        TreeItem<T> treeItem = getTreeItem();
        if (treeItem == null) {
            return;
        }

        if (comboBox == null) {
            comboBox = createComboBox(this, items, converterProperty());
            comboBox.editableProperty().bind(comboBoxEditableProperty());
        }
        if (hbox == null) {
            hbox = new HBox(CellUtils.TREE_VIEW_HBOX_GRAPHIC_PADDING);
        }

        comboBox.getSelectionModel().select(treeItem.getValue());

        super.startEdit();

        if (isEditing()) {
            setText(null);

            Node graphic = CellUtils.getGraphic(treeItem);
            if (graphic != null) {
                hbox.getChildren().setAll(graphic, comboBox);
                setGraphic(hbox);
            } else {
                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);

        Node graphic = CellUtils.getGraphic(getTreeItem());
        CellUtils.updateItem(this, getConverter(), hbox, graphic, comboBox);
    };
}