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| 弹出式菜单和鼠标事件 |
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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
public class PopupSample {
public static void main(String args[]) {
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println("Selected: "
+ actionEvent.getActionCommand());
}
};
PopupMenuListener popupMenuListener = new PopupMenuListener() {
public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) {
System.out.println("Canceled");
}
public void popupMenuWillBecomeInvisible(
PopupMenuEvent popupMenuEvent) {
System.out.println("Becoming Invisible");
}
public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {
System.out.println("Becoming Visible");
}
};
JFrame frame = new JFrame("Popup Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPopupMenu popupMenu = new JPopupMenu();
popupMenu.addPopupMenuListener(popupMenuListener);
JMenuItem cutMenuItem = new JMenuItem("Cut");
cutMenuItem.addActionListener(actionListener);
popupMenu.add(cutMenuItem);
JMenuItem copyMenuItem = new JMenuItem("Copy");
copyMenuItem.addActionListener(actionListener);
popupMenu.add(copyMenuItem);
JMenuItem pasteMenuItem = new JMenuItem("Paste");
pasteMenuItem.addActionListener(actionListener);
pasteMenuItem.setEnabled(false);
popupMenu.add(pasteMenuItem);
popupMenu.addSeparator();
JMenuItem findMenuItem = new JMenuItem("Find");
findMenuItem.addActionListener(actionListener);
popupMenu.add(findMenuItem);
MouseListener mouseListener = new JPopupMenuShower(popupMenu);
frame.addMouseListener(mouseListener);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
class JPopupMenuShower extends MouseAdapter {
private JPopupMenu popup;
public JPopupMenuShower(JPopupMenu popup) {
this.popup = popup;
}
private void showIfPopupTrigger(MouseEvent mouseEvent) {
if (popup.isPopupTrigger(mouseEvent)) {
popup.show(mouseEvent.getComponent(), mouseEvent.getX(), mouseEvent
.getY());
}
}
public void mousePressed(MouseEvent mouseEvent) {
showIfPopupTrigger(mouseEvent);
}
public void mouseReleased(MouseEvent mouseEvent) {
showIfPopupTrigger(mouseEvent);
}
}
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