I need to animate some selected menuitems and their perent menus. So far the solution I got that works well with menuitems but doesn't work well with their parent menu. (Solution source :Is it possible to make some items in the menu to fade in with 500 ms onset delay in Java?). To do the same effect on JMenus, I tried to do the same thing that was in the solution for animating JMenuItems (overriding addNotify() and removeNotify() check FadeMenu Class).
My code is following (yo can run this code):
AnimationEngine.java
package aphemeralmenudemo;
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
public class FadeMenuDemo {
private AnimationEngine engine;
public static void main(String[] args) {
new FadeMenuDemo();
}
public FadeMenuDemo() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
engine = new AnimationEngine();
JMenuBar mb = new JMenuBar();
JMenu Level1 = new JMenu("Level 1");
Level1.add("111");
Level1.add("222");
JMenu Level2 = new FadeMenu("Flip");
Level1.add(Level2);
Level2.add(new FadeMenuItem("Fade 1"));
Level2.add(new FadeMenuItem("Fade 2"));
Level2.add("Static 1");
Level2.add("Static 2");
mb.add(Level1);
JFrame frame = new JFrame("Testing");
frame.setJMenuBar(mb);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
TestPane.java
public class TestPane extends JPanel {
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
FadeMenuItem.java
public class FadeMenuItem extends JMenuItem {
public FadeMenuItem(String text) {
super(text);
engine.addTimingListener(new TimingListener() {
@Override
public void timingEvent() {
repaint();
}
});
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(engine.getAlpha()));
super.paintComponent(g2d);
g2d.dispose();
}
@Override
public void removeNotify() {
Container parent = getParent();
if (parent instanceof JPopupMenu) {
JPopupMenu menu = (JPopupMenu) parent;
engine.stop();
}
super.removeNotify();
}
@Override
public void addNotify() {
super.addNotify();
Container parent = getParent();
if (parent instanceof JPopupMenu) {
JPopupMenu menu = (JPopupMenu) parent;
engine.restart();
}
}
}
FadeMenu.java
public class FadeMenu extends JMenu{
public FadeMenu(String text) {
super(text);
engine.addTimingListener(new TimingListener() {
@Override
public void timingEvent() {
repaint();
}
});
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(engine.getAlpha()));
super.paintComponent(g2d);
g2d.dispose();
}
@Override
public void removeNotify() {
Container parent = getParent();
if (parent instanceof JPopupMenu) {
JPopupMenu menu = (JPopupMenu) parent;
engine.stop();
}
super.removeNotify();
}
@Override
public void addNotify() {
super.addNotify();
Container parent = getParent();
if (parent instanceof JPopupMenu) {
JPopupMenu menu = (JPopupMenu) parent;
engine.restart();
}
}
}
TimingListener.java
public interface TimingListener {
public void timingEvent();
}
AnimationEngine.java
public class AnimationEngine {
private Timer fade;
private float alpha;
private long startTime;
private long duration = 1000;
private List<TimingListener> listeners;
public AnimationEngine() {
listeners = new ArrayList<>(5);
fade = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
long elapsed = System.currentTimeMillis() - startTime;
if (elapsed >= duration) {
((Timer) e.getSource()).stop();
alpha = 1f;
} else {
alpha = (float) elapsed / (float) duration;
}
fireTimingEvent();
}
});
fade.setRepeats(true);
fade.setCoalesce(true);
fade.setInitialDelay(500);
}
public void addTimingListener(TimingListener listener) {
listeners.add(listener);
}
public void removeTimingListener(TimingListener listener) {
listeners.add(listener);
}
protected void fireTimingEvent() {
for (TimingListener listener : listeners) {
listener.timingEvent();
}
}
public void restart() {
fade.stop();
alpha = 0;
fireTimingEvent();
startTime = System.currentTimeMillis();
fade.start();
}
public float getAlpha() {
return alpha;
}
public void stop() {
fade.stop();
}
}
Overridden methods:
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(engine.getAlpha()));
super.paintComponent(g2d);
g2d.dispose();
}
@Override
public void removeNotify() {
Container parent = getParent();
if (parent instanceof JPopupMenu) {
JPopupMenu menu = (JPopupMenu) parent;
engine.stop();
}
super.removeNotify();
}
@Override
public void addNotify() {
super.addNotify();
Container parent = getParent();
if (parent instanceof JPopupMenu) {
JPopupMenu menu = (JPopupMenu) parent;
engine.restart();
}
}
Initially I looks fine. The menu text appeared in animation but when a sub item under that animated menu selected the menu text again animated. This is the problem, I don't want to animate the menu text upon selecting it's submenu. I really need help in this regard. Thanks in advance.
