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| public class JPopupMenuButton extends JPanel {
private JComponent component;
public JPopupMenuButton(JComponent component, JPopupMenu menu) {
super(new BorderLayout());
this.component=component;
component.setEnabled(true);
add(component);
MouseAdapter menuExitAdapter = new MouseAdapter() {
@Override
public void mouseMoved(MouseEvent arg0) {
menu.setVisible(false);
}
};
addAncestorListener(new AncestorListener() {
@Override
public void ancestorRemoved(AncestorEvent arg0) {
arg0.getAncestor().removeMouseMotionListener(menuExitAdapter);
}
@Override
public void ancestorMoved(AncestorEvent arg0) {
}
@Override
public void ancestorAdded(AncestorEvent arg0) {
arg0.getAncestor().addMouseMotionListener(menuExitAdapter);
}
});
MouseAdapter adapter = new MouseAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
if ( !menu.isVisible() ) {
menu.show(JPopupMenuButton.this, component.getX(), component.getY()+component.getHeight());
}
}
@Override
public void mouseExited(MouseEvent e) {
if ( menu.isVisible() ) {
if ( !menu.getComponent().contains(e.getPoint())) {
menu.setVisible(false);
}
}
}
};
component.addMouseListener(adapter);
component.addMouseMotionListener(adapter);
}
@Override
public Dimension getPreferredSize() {
return component.getPreferredSize();
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Box panel = new Box(BoxLayout.X_AXIS);
for(int i=0; i<5; i++) {
if ( i>0 ) {
panel.add(Box.createHorizontalStrut(1));
}
JPopupMenu menu = new JPopupMenu();
int n = ThreadLocalRandom.current().nextInt(3, 5);
for(int j=0; j<n; j++) {
JMenuItem menuitem = new JMenuItem("Menu " + i+"/"+j);
menuitem.addActionListener(e->System.out.println("Clic " + ((JMenuItem)e.getSource()).getText()));
menu.add(menuitem);
}
JComponent component = ThreadLocalRandom.current().nextBoolean()?new JButton("Bouton "+i):new JLabel("Label "+i);
if ( component instanceof JLabel) {
component.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.DARK_GRAY),BorderFactory.createEmptyBorder(2, 3, 2, 3)));
((JLabel) component).setHorizontalAlignment(JLabel.CENTER);
}
panel.add(new JPopupMenuButton( component,
menu));
}
frame.add(panel, BorderLayout.NORTH);
frame.setSize(600, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
} |
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