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| public class Demo {
public Demo() {
JFrame otherFrame = createFrame("Other Frame");
JFrame frame = createFrame("Frame 1");
frame.setLocation(otherFrame.getX() + otherFrame.getWidth(),
frame.getY());
frame.getContentPane().add(new Composant());
}
private JFrame createFrame(String title) {
JFrame frame = new JFrame(title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
return frame;
}
public static void main(String[] args) {
new Demo();
}
public static class Composant extends JComponent {
private boolean arrierePlan;
private final WindowListener windowListener;
public Composant() {
super();
windowListener = new WindowAdapter() {
@Override
public void windowActivated(WindowEvent e) {
setArrierePlan(false);
}
@Override
public void windowDeactivated(WindowEvent e) {
setArrierePlan(true);
}
};
addHierarchyListener(new HierarchyListener() {
private Window windowAncestor;
@Override
public void hierarchyChanged(HierarchyEvent e) {
if ( (e.getChangeFlags()&HierarchyEvent.PARENT_CHANGED)==HierarchyEvent.PARENT_CHANGED) {
if ( windowAncestor!=null ) {
windowAncestor.removeWindowListener(windowListener);
}
windowAncestor=SwingUtilities.getWindowAncestor(Composant.this);
if ( windowAncestor!=null ) {
windowAncestor.addWindowListener(windowListener);
setArrierePlan(!windowAncestor.isActive());
}
}
}
});
}
public void setArrierePlan(boolean arrierePlan) {
if (!arrierePlan != arrierePlan) {
this.arrierePlan = arrierePlan;
repaint();
}
}
@Override
public void paintComponent(Graphics pinceau) {
Graphics secondPinceau = pinceau.create();
if (arrierePlan) {
secondPinceau.setColor(Color.WHITE);
secondPinceau.fillRect(0, 0, getWidth(), getHeight());
secondPinceau.setColor(Color.CYAN);
secondPinceau.fillOval(0, -getHeight()/2, getWidth(), getHeight());
secondPinceau.fillOval(0, +getHeight()/2, getWidth(), getHeight());
} else {
secondPinceau.setColor(Color.GREEN);
secondPinceau.fillRect(0, 0, getWidth(), getHeight());
secondPinceau.setColor(Color.MAGENTA);
secondPinceau.fillOval(0, 0, getWidth(), getHeight());
}
}
}
} |
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