swing JPopupMenu 单击按钮弹出 例子下载
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public class Main {
public static void main(String[] argv) throws Exception {
final JPopupMenu menu = new JPopupMenu();
JMenuItem item = new JMenuItem("Item Label");
menu.add(item);
final JButton component = new JButton("button");
component.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (SwingUtilities.isLeftMouseButton(e)) {
menu.show(e.getComponent(), Math.round(component.getAlignmentX()) - 15,
Math.round(component.getAlignmentY()) + 20);
}
}
public void mouseReleased(MouseEvent evt) {
if (evt.isPopupTrigger()) {
//menu.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
});
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
JFrame frame = new JFrame("测试");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(800, 600));
frame.setLocationRelativeTo(null);
final JPanel mainPanel = new JPanel(new BorderLayout());
JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT, 0, 0));
topPanel.add(component);
mainPanel.add(topPanel, BorderLayout.NORTH);
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(mainPanel);
frame.setVisible(true);
}
});
}
}
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