DraggablePanelsExample.java

/*
 * Copyright (c) 2012 Oracle and/or its affiliates.
 * All rights reserved. Use is subject to license terms.
 * This file is available and licensed under the following license:
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the distribution.
 * - Neither the name of Oracle nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Handling mouse events with event filters
 */
package application;

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.control.RadioButton;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleGroup;
import javafx.scene.control.Tooltip;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.Region;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public final class DraggablePanelsExample extends Application
{
	private final BooleanProperty dragModeActiveProperty = new SimpleBooleanProperty(this, "dragModeActive", true);

	@Override
	public void start(final Stage stage)
	{
		final Node loginPanel = makeDraggable(createLoginPanel());
		final Node confirmationPanel = makeDraggable(createConfirmationPanel());
		final Node progressPanel = makeDraggable(createProgressPanel());

		loginPanel.relocate(0, 0);
		confirmationPanel.relocate(0, 67);
		progressPanel.relocate(0, 106);

		final Pane panelsPane = new Pane();
		panelsPane.getChildren().addAll(loginPanel, confirmationPanel, progressPanel);

		final BorderPane sceneRoot = new BorderPane();

		BorderPane.setAlignment(panelsPane, Pos.TOP_LEFT);
		sceneRoot.setCenter(panelsPane);

		final CheckBox dragModeCheckbox = new CheckBox("Drag mode");
		BorderPane.setMargin(dragModeCheckbox, new Insets(6));
		sceneRoot.setBottom(dragModeCheckbox);

		dragModeActiveProperty.bind(dragModeCheckbox.selectedProperty());

		final Scene scene = new Scene(sceneRoot, 400, 300);
		stage.setScene(scene);
		stage.setTitle("Draggable Panels Example");
		stage.show();
	}

	public static void main(final String[] args)
	{
		launch(args);
	}

	private Node makeDraggable(final Node node)
	{
		final DragContext dragContext = new DragContext();
		final Group wrapGroup = new Group(node);

		wrapGroup.addEventFilter(MouseEvent.ANY, new EventHandler<MouseEvent>(){
			public void handle(final MouseEvent mouseEvent)
			{
				if(dragModeActiveProperty.get())
				{
					// disable mouse events for all children
					mouseEvent.consume();
				}
			}
		});

		wrapGroup.addEventFilter(MouseEvent.MOUSE_PRESSED, new EventHandler<MouseEvent>(){
			public void handle(final MouseEvent mouseEvent)
			{
				if(dragModeActiveProperty.get())
				{
					// remember initial mouse cursor coordinates
					// and node position
					dragContext.mouseAnchorX = mouseEvent.getX();
					dragContext.mouseAnchorY = mouseEvent.getY();
					dragContext.initialTranslateX = node.getTranslateX();
					dragContext.initialTranslateY = node.getTranslateY();
				}
			}
		});

		wrapGroup.addEventFilter(MouseEvent.MOUSE_DRAGGED, new EventHandler<MouseEvent>(){
			public void handle(final MouseEvent mouseEvent)
			{
				if(dragModeActiveProperty.get())
				{
					// shift node from its initial position by delta
					// calculated from mouse cursor movement
					node.setTranslateX(dragContext.initialTranslateX + mouseEvent.getX() - dragContext.mouseAnchorX);
					node.setTranslateY(dragContext.initialTranslateY + mouseEvent.getY() - dragContext.mouseAnchorY);
				}
			}
		});

		return wrapGroup;
	}

	private static Node createLoginPanel()
	{
		final ToggleGroup toggleGroup = new ToggleGroup();

		final TextField textField = new TextField();
		textField.setPrefColumnCount(10);
		textField.setPromptText("Your name");

		final PasswordField passwordField = new PasswordField();
		passwordField.setPrefColumnCount(10);
		passwordField.setPromptText("Your password");

		final ChoiceBox<String> choiceBox = new ChoiceBox<String>(FXCollections.observableArrayList("English", "\u0420\u0443\u0441\u0441\u043a\u0438\u0439", "Fran\u00E7ais"));
		choiceBox.setTooltip(new Tooltip("Your language"));
		choiceBox.getSelectionModel().select(0);

		final HBox panel = createHBox(6, createVBox(2, createRadioButton("High", toggleGroup, true), createRadioButton("Medium", toggleGroup, false), createRadioButton("Low", toggleGroup, false)), createVBox(2, textField, passwordField), choiceBox);
		panel.setAlignment(Pos.BOTTOM_LEFT);
		configureBorder(panel);

		return panel;
	}

	private static Node createConfirmationPanel()
	{
		final Label acceptanceLabel = new Label("Not Available");

		final Button acceptButton = new Button("Accept");
		acceptButton.setOnAction(new EventHandler<ActionEvent>(){
			public void handle(final ActionEvent event)
			{
				acceptanceLabel.setText("Accepted");
			}
		});

		final Button declineButton = new Button("Decline");
		declineButton.setOnAction(new EventHandler<ActionEvent>(){
			public void handle(final ActionEvent event)
			{
				acceptanceLabel.setText("Declined");
			}
		});

		final HBox panel = createHBox(6, acceptButton, declineButton, acceptanceLabel);
		panel.setAlignment(Pos.CENTER_LEFT);
		configureBorder(panel);

		return panel;
	}

	private static Node createProgressPanel()
	{
		final Slider slider = new Slider();

		final ProgressIndicator progressIndicator = new ProgressIndicator(0);
		progressIndicator.progressProperty().bind(Bindings.divide(slider.valueProperty(), slider.maxProperty()));

		final HBox panel = createHBox(6, new Label("Progress:"), slider, progressIndicator);
		configureBorder(panel);

		return panel;
	}

	private static void configureBorder(final Region region)
	{
		region.setStyle("-fx-background-color: white;" + "-fx-border-color: black;" + "-fx-border-width: 1;" + "-fx-border-radius: 6;" + "-fx-padding: 6;");
	}

	private static RadioButton createRadioButton(final String text, final ToggleGroup toggleGroup, final boolean selected)
	{
		final RadioButton radioButton = new RadioButton(text);
		radioButton.setToggleGroup(toggleGroup);
		radioButton.setSelected(selected);

		return radioButton;
	}

	private static HBox createHBox(final double spacing, final Node... children)
	{
		final HBox hbox = new HBox(spacing);
		hbox.getChildren().addAll(children);
		return hbox;
	}

	private static VBox createVBox(final double spacing, final Node... children)
	{
		final VBox vbox = new VBox(spacing);
		vbox.getChildren().addAll(children);
		return vbox;
	}

	private static final class DragContext
	{
		public double mouseAnchorX;
		public double mouseAnchorY;
		public double initialTranslateX;
		public double initialTranslateY;
	}
}