Question

此问题与this one类似。我所拥有的是从系统托盘上的图标弹出的JPopupMenu。此时，系统托盘是程序的唯一表现形式。也就是说，没有其他窗口打开，系统托盘中的图标是我可以访问该程序的唯一方法。我在AWT JPopupMenu上使用PopupMenu，因为我想将系统外观应用到弹出菜单中 - 当我只使用普通PopupMenu时，我无法获得系统的外观和感觉，我只是不断获得Swing的金属外观和感觉。我使用这种方法来解决这种问题（描述here）：

systemTrayPopupMenu = buildSystemTrayJPopupMenu();
trayIcon = new TrayIcon(iconImage, "Application Name", null /* Popup Menu */);
trayIcon.addMouseListener (new MouseAdapter () {
    @Override
    public void mouseReleased (MouseEvent me) {
        if (me.isPopupTrigger()) {
            systemTrayPopupMenu.setLocation(me.getX(), me.getY());
            systemTrayPopupMenu.setInvoker(systemTrayPopupMenu);
            systemTrayPopupMenu.setVisible(true);
        }
    }
};

当我右键单击托盘图标时，它会显示菜单，当然，当我进行选择时，菜单会消失。但是，当我调出菜单，然后单击它时，它不会消失。为了使它当前消失，我必须做出选择，或者选择一个被禁用的菜单项。

我尝试向其添加FocusListener，但是，没有迹象表明focusLost或focusGained方法被调用。另外，当另一个Window获得焦点时，我不能让它消失，因为没有其他窗口存在。由于此弹出式菜单来自TrayIcon而非典型按钮，因此我无法使用here提及的解决方案来绕过FocusListener而不是调用focusLost。

最终，我想知道的是：
1）有没有办法让系统的外观和感觉为正常的AWT PopupMenu？或者 2）有没有办法让JPopupMenu在失去焦点时消失？

编辑：根据请求，这是我的SSCCE：

import java.awt.*;
import java.awt.event.*;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.*;

public class SwingSystemTray {

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run () {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                new SwingSystemTray ();
            } catch (Exception e) {
                System.out.println("Not using the System UI defeats the purpose...");
                e.printStackTrace();
            }
        }
    });
}

protected SystemTray systemTray;
protected TrayIcon trayIcon;
protected JPopupMenu systemTrayPopupMenu;
protected Image iconImage;

public SwingSystemTray () throws IOException {
    iconImage = getIcon ();
    if (SystemTray.isSupported()) {
        systemTray = SystemTray.getSystemTray();
        systemTrayPopupMenu = buildSystemTrayJPopupMenu();
        trayIcon = new TrayIcon(iconImage, "Application Name", null /* Popup Menu */);
        trayIcon.addMouseListener (new MouseAdapter () {
            @Override
            public void mouseReleased (MouseEvent me) {
                if (me.isPopupTrigger()) {
                    systemTrayPopupMenu.setLocation(me.getX(), me.getY());
                    systemTrayPopupMenu.setInvoker(systemTrayPopupMenu);
                    systemTrayPopupMenu.setVisible(true);
                }
            }
        });
        try {
            systemTray.add(trayIcon);
        } catch (AWTException e) {
            System.out.println("Could not place item at tray.  Exiting.");
        }
    }
}

protected JPopupMenu buildSystemTrayJPopupMenu () {
    final JPopupMenu menu = new JPopupMenu ();
    final JMenuItem showMenuItem = new JMenuItem("Show");
    final JMenuItem hideMenuItem = new JMenuItem("Hide");
    final JMenuItem exitMenuItem = new JMenuItem("Exit");
    hideMenuItem.setEnabled(false);
    ActionListener listener = new ActionListener () {
        @Override
        public void actionPerformed (ActionEvent ae) {
            Object source = ae.getSource();
            if (source == showMenuItem) {
                System.out.println("Shown");
                showMenuItem.setEnabled(false);
                hideMenuItem.setEnabled(true);
           }
           else if (source == hideMenuItem) {
                System.out.println("Hidden");
                hideMenuItem.setEnabled(false);
                showMenuItem.setEnabled(true);
            }
            else if (source == exitMenuItem) {
                System.exit(0);
            }
        }
    };
    for (JMenuItem item : new JMenuItem [] {showMenuItem, hideMenuItem, exitMenuItem}) {
        if (item == exitMenuItem) menu.addSeparator();
        menu.add(item);
        item.addActionListener(listener);
    }
    return menu;
}

protected Image getIcon () throws IOException {
    // Build the 16x16 image programmatically, start with BMP Header
    byte [] iconData = new byte[822];
    System.arraycopy(new byte [] {0x42,0x4d,0x36,0x03, 0,0,0,0, 0,0,0x36,0, 
            0,0,0x28,0, 0,0,16,0, 0,0,16,0, 0,0,16,0, 24,0,0,0, 0,0,0,3},
            0, iconData, 0, 36);
    for (int i = 36; i < 822; iconData[i++] = 0);
    for (int i = 56; i < 822; i += 3) iconData[i] = -1;     
    return ImageIO.read(new java.io.ByteArrayInputStream(iconData));
}
}

Answer 1

我发现了一个我认为可以很好地工作的黑客。我还没有在Windows XP中测试它，但它可以在Windows 7中运行。这涉及添加一个“隐藏的对话框”，在弹出菜单后面显示，就像弹出菜单来自隐藏的对话框一样第一名。唯一真正的诀窍是让隐藏的对话框留在弹出菜单后面。至少在Windows 7中，它显示在系统托盘后面，所以你从来没有真正看到它。可以将WindowFocusListener添加到此隐藏对话框中，因此当您单击弹出菜单时，您也会单击隐藏的对话框。我已将此功能添加到我之前发布的SSCCE中，以说明如何添加此功能：

package org.test; import java.awt.*; import java.awt.event.*; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.*; public class SwingSystemTray { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run () { try { /* We are going for the Windows Look and Feel here */ UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); new SwingSystemTray (); } catch (Exception e) { System.out.println("Not using the System UI defeats the purpose..."); e.printStackTrace(); } } }); } protected SystemTray systemTray; protected TrayIcon trayIcon; protected JPopupMenu systemTrayPopupMenu; protected Image iconImage; /* Added a "hidden dialog" */ protected JDialog hiddenDialog; public SwingSystemTray () throws IOException { iconImage = getIcon (); if (SystemTray.isSupported()) { systemTray = SystemTray.getSystemTray(); systemTrayPopupMenu = buildSystemTrayJPopupMenu(); trayIcon = new TrayIcon(iconImage, "Application Name", null /* Popup Menu */); trayIcon.addMouseListener (new MouseAdapter () { @Override public void mouseReleased (MouseEvent me) { if (me.isPopupTrigger()) { systemTrayPopupMenu.setLocation(me.getX(), me.getY()); /* Place the hidden dialog at the same location */ hiddenDialog.setLocation(me.getX(), me.getY()); /* Now the popup menu's invoker is the hidden dialog */ systemTrayPopupMenu.setInvoker(hiddenDialog); hiddenDialog.setVisible(true); systemTrayPopupMenu.setVisible(true); } } }); trayIcon.addActionListener(new ActionListener() { @Override public void actionPerformed (ActionEvent ae) { System.out.println("actionPerformed"); } }); try { systemTray.add(trayIcon); } catch (AWTException e) { System.out.println("Could not place item at tray. Exiting."); } } /* Initialize the hidden dialog as a headless, titleless dialog window */ hiddenDialog = new JDialog (); hiddenDialog.setSize(10, 10); /* Add the window focus listener to the hidden dialog */ hiddenDialog.addWindowFocusListener(new WindowFocusListener () { @Override public void windowLostFocus (WindowEvent we ) { hiddenDialog.setVisible(false); } @Override public void windowGainedFocus (WindowEvent we) {} }); } protected JPopupMenu buildSystemTrayJPopupMenu () { final JPopupMenu menu = new JPopupMenu (); final JMenuItem showMenuItem = new JMenuItem("Show"); final JMenuItem hideMenuItem = new JMenuItem("Hide"); final JMenuItem exitMenuItem = new JMenuItem("Exit"); hideMenuItem.setEnabled(false); ActionListener listener = new ActionListener () { @Override public void actionPerformed (ActionEvent ae) { /* We want to make sure the hidden dialog goes away after selection */ hiddenDialog.setVisible(false); Object source = ae.getSource(); if (source == showMenuItem) { System.out.println("Shown"); showMenuItem.setEnabled(false); hideMenuItem.setEnabled(true); } else if (source == hideMenuItem) { System.out.println("Hidden"); hideMenuItem.setEnabled(false); showMenuItem.setEnabled(true); } else if (source == exitMenuItem) { System.exit(0); } } }; for (JMenuItem item : new JMenuItem [] {showMenuItem, hideMenuItem, exitMenuItem}) { if (item == exitMenuItem) menu.addSeparator(); menu.add(item); item.addActionListener(listener); } return menu; } protected Image getIcon () throws IOException { // Build the 16x16 image programmatically, start with BMP Header byte [] iconData = new byte[822]; System.arraycopy(new byte [] {0x42,0x4d,0x36,0x03, 0,0,0,0, 0,0,0x36,0, 0,0,0x28,0, 0,0,16,0, 0,0,16,0, 0,0,16,0, 24,0,0,0, 0,0,0,3}, 0, iconData, 0, 36); for (int i = 36; i < 822; iconData[i++] = 0); for (int i = 56; i < 822; i += 3) iconData[i] = -1; return ImageIO.read(new java.io.ByteArrayInputStream(iconData)); } }

此解决方案为我提供了我正在寻找的第2项要求，即当JPopupMenu使用Windows系统外观失去对系统托盘的关注时，JPopupMenu会消失。

注意：我没有使用PopupMenu功能在CentOS / RedHat Linux中的系统托盘上工作。对于那些人，我将只需使用普通的AWT {{1}}。

Answer 2

JPopupMenu无法单独显示。那就是需要将它添加到窗口中。尝试使用WindowListener，然后在windowDeactivated（）事件中隐藏弹出窗口。弹出窗口可见后，您应该可以使用以下命令获取窗口：

Window window = SwingUtilities.windowForComonent(systemTrayPopupMenu);

Answer 3

我刚刚在JPopup菜单上使用了MouseListener，它在鼠标退出时调用了一个计时器Thread;如果鼠标重新进入，我重置＆＃34; mouseStillOnMenu＆＃34;旗。将＆＃34; Thread.sleep（）值设置为您希望用户离开菜单的时间长 - 如果您正常单击菜单项，则会调用默认菜单关闭行为并关闭菜单。

@Override
public void mouseEntered(MouseEvent arg0) {
    mouseStillOnMenu = true;

}

@Override
public void mouseExited(MouseEvent arg0) {
    mouseStillOnMenu = false;

    new Thread(new Runnable() {

        @Override
        public void run() {

            try {
                Thread.sleep(1000);  //waits one second before checking if mouse is still on the menu
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            if (!isMouseStillOnMenu()) {
                jpopup.setVisible(false);
            }

        }

    }).start();

}

当它失去焦点时，无法隐藏SystemTray JPopupMenu

3 个答案: