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/*
* Copyright (c) 2014, 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.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import org.controlsfx.DialogResources;
import javafx.application.Platform;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.control.ButtonBar.ButtonData;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.Region;
/**
* A dialog that shows a list of choices to the user, from which they can pick
* one item at most.
*
* @see Dialog
* @param The type of the items to show to the user, and the type that is returned
* via {@link #getResult()} when the dialog is dismissed.
* @since JavaFX 8u40
*/
public class ChoiceDialog extends Dialog {
/**************************************************************************
*
* Fields
*
**************************************************************************/
private final GridPane grid;
private final Label label;
private final ComboBox comboBox;
private final T defaultChoice;
/**************************************************************************
*
* Constructors
*
**************************************************************************/
/**
* Creates a default, empty instance of ChoiceDialog with no set items and a
* null default choice. Users of this constructor will subsequently need to
* call {@link #getItems()} to specify which items to show to the user.
*/
public ChoiceDialog() {
this((T)null, (T[])null);
}
/**
* Creates a new ChoiceDialog instance with the first argument specifying the
* default choice that should be shown to the user, and all following arguments
* considered a varargs array of all available choices for the user. It is
* expected that the defaultChoice be one of the elements in the choices varargs
* array. If this is not true, then defaultChoice will be set to null and the
* dialog will show with the initial choice set to the first item in the list
* of choices.
*
* @param defaultChoice The item to display as the pre-selected choice in the dialog.
* This item must be contained within the choices varargs array.
* @param choices All possible choices to present to the user.
*/
public ChoiceDialog(T defaultChoice, @SuppressWarnings("unchecked") T... choices) {
this(defaultChoice,
choices == null ? Collections.emptyList() : Arrays.asList(choices));
}
/**
* Creates a new ChoiceDialog instance with the first argument specifying the
* default choice that should be shown to the user, and the second argument
* specifying a collection of all available choices for the user. It is
* expected that the defaultChoice be one of the elements in the choices
* collection. If this is not true, then defaultChoice will be set to null and the
* dialog will show with the initial choice set to the first item in the list
* of choices.
*
* @param defaultChoice The item to display as the pre-selected choice in the dialog.
* This item must be contained within the choices varargs array.
* @param choices All possible choices to present to the user.
*/
public ChoiceDialog(T defaultChoice, Collection choices) {
final DialogPane dialogPane = getDialogPane();
// -- grid
this.grid = new GridPane();
this.grid.setHgap(10);
this.grid.setMaxWidth(Double.MAX_VALUE);
this.grid.setAlignment(Pos.CENTER_LEFT);
// -- label
label = DialogPane.createContentLabel(dialogPane.getContentText());
label.setPrefWidth(Region.USE_COMPUTED_SIZE);
label.textProperty().bind(dialogPane.contentTextProperty());
dialogPane.contentTextProperty().addListener(o -> updateGrid());
setTitle(DialogResources.getString("Dialog.confirm.title"));
dialogPane.setHeaderText(DialogResources.getString("Dialog.confirm.header"));
dialogPane.getStyleClass().add("choice-dialog");
dialogPane.getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);
final double MIN_WIDTH = 150;
comboBox = new ComboBox();
comboBox.setMinWidth(MIN_WIDTH);
if (choices != null) {
comboBox.getItems().addAll(choices);
}
comboBox.setMaxWidth(Double.MAX_VALUE);
GridPane.setHgrow(comboBox, Priority.ALWAYS);
GridPane.setFillWidth(comboBox, true);
this.defaultChoice = comboBox.getItems().contains(defaultChoice) ? defaultChoice : null;
if (defaultChoice == null) {
comboBox.getSelectionModel().selectFirst();
} else {
comboBox.getSelectionModel().select(defaultChoice);
}
updateGrid();
setResultConverter((dialogButton) -> {
ButtonData data = dialogButton == null ? null : dialogButton.getButtonData();
return data == ButtonData.OK_DONE ? getSelectedItem() : null;
});
}
/**************************************************************************
*
* Public API
*
**************************************************************************/
/**
* Returns the currently selected item in the dialog.
*/
public final T getSelectedItem() {
return comboBox.getSelectionModel().getSelectedItem();
}
/**
* Returns the property representing the currently selected item in the dialog.
*/
public final ReadOnlyObjectProperty selectedItemProperty() {
return comboBox.getSelectionModel().selectedItemProperty();
}
/**
* Sets the currently selected item in the dialog.
* @param item The item to select in the dialog.
*/
public final void setSelectedItem(T item) {
comboBox.getSelectionModel().select(item);
}
/**
* Returns the list of all items that will be displayed to users. This list
* can be modified by the developer to add, remove, or reorder the items
* to present to the user.
*/
public final ObservableList getItems() {
return comboBox.getItems();
}
/**
* Returns the default choice that was specified in the constructor.
*/
public final T getDefaultChoice() {
return defaultChoice;
}
/**************************************************************************
*
* Private Implementation
*
**************************************************************************/
private void updateGrid() {
grid.getChildren().clear();
grid.add(label, 0, 0);
grid.add(comboBox, 1, 0);
getDialogPane().setContent(grid);
Platform.runLater(() -> comboBox.requestFocus());
}
}