Adds a glass layer to the dialog to intercept all key events. - Java Swing

Java examples for Swing:JOptionPane

  1. HOME
  2. Java
  3. Swing
  4. JOptionPane

Description

Adds a glass layer to the dialog to intercept all key events.

Demo Code


//package com.java2s;
import java.awt.AWTEvent;

import java.awt.Container;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.JComponent;
import javax.swing.JDialog;

import javax.swing.JLayer;

import javax.swing.Timer;
import javax.swing.plaf.LayerUI;

public class Main {
    /**//from w  ww .  j  ava 2 s  .  c  o  m
     * Adds a glass layer to the dialog to intercept all key events. If the
     * espace key is pressed, the dialog is disposed (either with a fadeout
     * animation, or directly).
     */
    public static void addEscapeToCloseSupport(final JDialog dialog,
            final boolean fadeOnClose) {
        LayerUI<Container> layerUI = new LayerUI<Container>() {
            private boolean closing = false;

            @Override
            public void installUI(JComponent c) {
                super.installUI(c);
                ((JLayer) c).setLayerEventMask(AWTEvent.KEY_EVENT_MASK);
            }

            @Override
            public void uninstallUI(JComponent c) {
                super.uninstallUI(c);
                ((JLayer) c).setLayerEventMask(0);
            }

            @Override
            public void eventDispatched(AWTEvent e,
                    JLayer<? extends Container> l) {
                if (e instanceof KeyEvent
                        && ((KeyEvent) e).getKeyCode() == KeyEvent.VK_ESCAPE) {
                    if (closing)
                        return;
                    closing = true;
                    if (fadeOnClose)
                        fadeOut(dialog);
                    else
                        dialog.dispose();
                }
            }
        };

        JLayer<Container> layer = new JLayer<Container>(
                dialog.getContentPane(), layerUI);
        dialog.setContentPane(layer);
    }

    /**
     * Creates an animation to fade the dialog opacity from 1 to 0.
     */
    public static void fadeOut(final JDialog dialog) {
        final Timer timer = new Timer(10, null);
        timer.setRepeats(true);
        timer.addActionListener(new ActionListener() {
            private float opacity = 1;

            @Override
            public void actionPerformed(ActionEvent e) {
                opacity -= 0.15f;
                dialog.setOpacity(Math.max(opacity, 0));
                if (opacity <= 0) {
                    timer.stop();
                    dialog.dispose();
                }
            }
        });

        dialog.setOpacity(1);
        timer.start();
    }
}

Related Tutorials