Java TrayIcon:addMouseListener - >区分单击和双击?

时间:2015-04-27 09:20:40

标签: java click trayicon

我想在点击TrayIcon时显示警告,并在双击时显示主窗口。我在捕获双击事件时遇到问题:每次双击时,都会触发两个单击事件。

我使用以下代码:

        trayIcon.addMouseListener(new MouseAdapter() {
        public void mouseClicked(MouseEvent e) {
             if (e.getClickCount() == 1 && e.getButton() == 1) {                
                 trayIcon.displayMessage(...);              
             } else if (e.getClickCount() == 2 && e.getButton() == 1) {
                frame.setVisible(true);
            }
        }
    });

如何防止单击事件窃取双击?

2 个答案:

答案 0 :(得分:1)

这是一个不完美问题的不完美解决方案。就其本质而言,双击将产生两个鼠标事件,但双击是在相互之间的短时间内发生的任意两次点击。

因此,您可以在第一次点击时插入一个小延迟,如果触发,将会"假设"该事件只需单击一次。

此示例使用设置为300毫秒的Swing Timer(您可以尝试250-275,但我发现300恰好是正确的)。当它检测到第一次点击时,它启动计时器,如果它检测到第二次点击,它会停止计时器,否则计时器被允许在300毫秒延迟后执行,假定双击......

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class JavaApplication314 {

    public static void main(String[] args) {
        new JavaApplication314();
    }

    public JavaApplication314() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private JLabel label;

        public TestPane() {
            addMouseListener(new MouseHandler());
            label = new JLabel("...");
            setLayout(new GridBagLayout());
            add(label);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        protected void doOneClick() {
            label.setText("One Click");
        }

        protected void doTwoClicks() {
            label.setText("Two Clicks");
        }

        public class MouseHandler extends MouseAdapter {

            private Timer oneClickTimer;

            public MouseHandler() {
                oneClickTimer = new Timer(300, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        doOneClick();
                    }
                });
                oneClickTimer.setRepeats(false);
            }

            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2) {
                    oneClickTimer.stop();
                    doTwoClicks();
                } else if (e.getClickCount() == 1) {
                    oneClickTimer.restart();
                }
            }



        }

    }

}

另一种选择可能是使用元键(如 Alt )一键更改菜单的状态

答案 1 :(得分:0)

if (e.getClickCount() == 2 && !e.isConsumed()) {
     e.consume();
     ...
}