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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 static javafx.scene.control.cell.CellUtils.createChoiceBox;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.util.Callback;
import javafx.util.StringConverter;


A class containing a ListCell implementation that draws a ChoiceBox node inside the cell. 
By default, the ChoiceBoxListCell is rendered as a Label when not being edited, and as a ChoiceBox when in editing mode. The ChoiceBox will, by default, stretch to fill the entire list cell. 
To create a ChoiceBoxListCell, it is necessary to provide zero or more items that will be shown to the user when the ChoiceBox menu is showing. These items must be of the same type as the ListView items sequence, such that upon selection, they replace the existing value in the items list. 
Type parameters:
  • <T> – The type of the elements contained within the ListView.
Since:JavaFX 2.2
/**
 * A class containing a {@link ListCell} implementation that draws a
 * {@link ChoiceBox} node inside the cell.
 *
 * <p>By default, the ChoiceBoxListCell is rendered as a {@link Label} when not
 * being edited, and as a ChoiceBox when in editing mode. The ChoiceBox will, by
 * default, stretch to fill the entire list cell.
 *
 * <p>To create a ChoiceBoxListCell, it is necessary to provide zero or more
 * items that will be shown to the user when the {@link ChoiceBox} menu is
 * showing. These items must be of the same type as the ListView items sequence,
 * such that upon selection, they replace the existing value in the
 * {@link ListView#itemsProperty() items} list.
 *
 * @param <T> The type of the elements contained within the ListView.
 * @since JavaFX 2.2
 */
public class ChoiceBoxListCell<T> extends ListCell<T> {

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

    
Creates a ChoiceBox cell factory for use in ListView controls. By default, the ChoiceBoxCell is rendered as a Label when not being edited, and as a ChoiceBox when in editing mode. The ChoiceBox 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 ChoiceBox menu is showing. These items must be of the same type as the ListView items list, such that upon selection, they replace the existing value in the items list.
Type parameters:
  • <T> – The type of the elements contained within the ListView.
Returns:A Callback that will return a ListCell that is able to work on the type of element contained within the ListView.
/**
     * Creates a ChoiceBox cell factory for use in {@link ListView} controls.
     * By default, the ChoiceBoxCell is rendered as a {@link Label} when not
     * being edited, and as a ChoiceBox when in editing mode. The ChoiceBox will,
     * by default, stretch to fill the entire list cell.
     *
     * @param <T> The type of the elements contained within the ListView.
     * @param items Zero or more items that will be shown to the user when the
     *      {@link ChoiceBox} menu is showing. These items must be of the same
     *      type as the ListView items list, such that upon selection, they
     *      replace the existing value in the
     *      {@link ListView#itemsProperty() items} list.
     * @return A {@link Callback} that will return a ListCell that is able to
     *      work on the type of element contained within the ListView.
     */
    @SafeVarargs
    public static <T> Callback<ListView<T>, ListCell<T>> forListView(final T... items) {
        return forListView(FXCollections.observableArrayList(items));
    }

    
Creates a ChoiceBox cell factory for use in ListView controls. By default, the ChoiceBoxCell is rendered as a Label when not being edited, and as a ChoiceBox when in editing mode. The ChoiceBox 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 ChoiceBox menu is showing. These items must be of the same type as the ListView items list, such that upon selection, they replace the existing value in the items list.
Type parameters:
  • <T> – The type of the elements contained within the ListView.
Returns:A Callback that will return a ListCell that is able to work on the type of element contained within the ListView.
/**
     * Creates a ChoiceBox cell factory for use in {@link ListView} controls. By
     * default, the ChoiceBoxCell is rendered as a {@link Label} when not being
     * edited, and as a ChoiceBox when in editing mode. The ChoiceBox will, by
     * default, stretch to fill the entire list cell.
     *
     * @param <T> The type of the elements contained within the ListView.
     * @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 ChoiceBox} menu is showing. These items must be of the same
     *      type as the ListView items list, such that upon selection, they
     *      replace the existing value in the
     *      {@link ListView#itemsProperty() items} list.
     * @return A {@link Callback} that will return a ListCell that is able to
     *      work on the type of element contained within the ListView.
     */
    @SafeVarargs
    public static <T> Callback<ListView<T>, ListCell<T>> forListView(
            final StringConverter<T> converter,
            final T... items) {
        return forListView(converter, FXCollections.observableArrayList(items));
    }

    
Creates a ChoiceBox cell factory for use in ListView controls. By default, the ChoiceBoxCell is rendered as a Label when not being edited, and as a ChoiceBox when in editing mode. The ChoiceBox will, by default, stretch to fill the entire list cell. 
Params:
  • items – An ObservableList containing zero or more items that will be shown to the user when the ChoiceBox menu is showing. These items must be of the same type as the ListView items sequence, such that upon selection, they replace the existing value in the items list.
Type parameters:
  • <T> – The type of the elements contained within the ListView.
Returns:A Callback that will return a ListCell that is able to work on the type of element contained within the ListView.
/**
     * Creates a ChoiceBox cell factory for use in {@link ListView} controls.
     * By default, the ChoiceBoxCell is rendered as a {@link Label} when not
     * being edited, and as a ChoiceBox when in editing mode. The ChoiceBox
     * will, by default, stretch to fill the entire list cell.
     *
     * @param <T> The type of the elements contained within the ListView.
     * @param items An {@link ObservableList} containing zero or more items that
     *      will be shown to the user when the {@link ChoiceBox} menu is showing.
     *      These items must be of the same type as the ListView items sequence,
     *      such that upon selection, they replace the existing value in the
     *      {@link ListView#itemsProperty() items} list.
     * @return A {@link Callback} that will return a ListCell that is able to
     *      work on the type of element contained within the ListView.
     */
    public static <T> Callback<ListView<T>, ListCell<T>> forListView(
            final ObservableList<T> items) {
        return forListView(null, items);
    }

    
Creates a ChoiceBox cell factory for use in ListView controls. By default, the ChoiceBoxCell is rendered as a Label when not being edited, and as a ChoiceBox when in editing mode. The ChoiceBox 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 – An ObservableList containing zero or more items that will be shown to the user when the ChoiceBox menu is showing. These items must be of the same type as the ListView items sequence, such that upon selection, they replace the existing value in the items list.
Type parameters:
  • <T> – The type of the elements contained within the ListView.
Returns:A Callback that will return a ListCell that is able to work on the type of element contained within the ListView.
/**
     * Creates a ChoiceBox cell factory for use in {@link ListView} controls. By
     * default, the ChoiceBoxCell is rendered as a {@link Label} when not being
     * edited, and as a ChoiceBox when in editing mode. The ChoiceBox will, by
     * default, stretch to fill the entire list cell.
     *
     * @param <T> The type of the elements contained within the ListView.
     * @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 ChoiceBox} menu is showing.
     *      These items must be of the same type as the ListView items sequence,
     *      such that upon selection, they replace the existing value in the
     *      {@link ListView#itemsProperty() items} list.
     * @return A {@link Callback} that will return a ListCell that is able to
     *      work on the type of element contained within the ListView.
     */
    public static <T> Callback<ListView<T>, ListCell<T>> forListView(
            final StringConverter<T> converter,
            final ObservableList<T> items) {
        return list -> new ChoiceBoxListCell<T>(converter, items);
    }



    
                                                                        *
Fields                                                                  *
                                                                        *

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

    private final ObservableList<T> items;

    private ChoiceBox<T> choiceBox;



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

    
Creates a default ChoiceBoxListCell with an empty items list.

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

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

    
Creates a ChoiceBoxListCell instance with the given items being used to populate the ChoiceBox 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 ChoiceBox popup menu.
  • items – The items to show in the ChoiceBox popup menu when selected
     by the user.
/**
     * Creates a {@link ChoiceBoxListCell} instance with the given items
     * being used to populate the {@link ChoiceBox} 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
     *      ChoiceBox popup menu.
     * @param items The items to show in the ChoiceBox popup menu when selected
     *      by the user.
     */
    @SafeVarargs
    public ChoiceBoxListCell(StringConverter<T> converter, T... items) {
        this(converter, FXCollections.observableArrayList(items));
    }

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

    
Creates a ChoiceBoxListCell instance with the given items being used to populate the ChoiceBox 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 ChoiceBox popup menu.
  • items – The items to show in the ChoiceBox popup menu when selected
     by the user.
/**
     * Creates a {@link ChoiceBoxListCell} instance with the given items
     * being used to populate the {@link ChoiceBox} 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
     *      ChoiceBox popup menu.
     * @param items The items to show in the ChoiceBox popup menu when selected
     *      by the user.
     */
    public ChoiceBoxListCell(StringConverter<T> converter, ObservableList<T> items) {
        this.getStyleClass().add("choice-box-list-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();
    }



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

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

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

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

        if (choiceBox == null) {
            choiceBox = createChoiceBox(this, items, converterProperty());
        }

        choiceBox.getSelectionModel().select(getItem());

        super.startEdit();

        if (isEditing()) {
            setText(null);
            setGraphic(choiceBox);
        }
    }

    
{@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, choiceBox);
    }
}