Question

我有一个JFrame，其中包含许多具有不同功能的子组件和子面板。我已经为其中一些添加了mouseListeners。

我希望能够在框架中单击鼠标按钮时调用函数，而不管焦点是什么组件。我不想将mouselisteners添加到所有组件中。就像keyEventDispacher一样，我将它用作键盘。

我看过这个Dispatch MouseEvent，但我无法解决这个问题。谁能给我一个小例子来证明它是如何工作的？

Answer 1

以下是全局鼠标侦听器的简单示例：

public static void main ( String[] args )
{
    final JFrame frame = new JFrame ();

    // Some content
    frame.getContentPane ().setLayout ( new FlowLayout ( FlowLayout.CENTER, 5, 5 ) );
    frame.getContentPane ().add ( new JButton ( "Test" ) );
    frame.getContentPane ().add ( new JLabel ( "Test" ) );
    frame.getContentPane ().add ( new JTextField ( "Test" ) );

    // Global mouse listener
    final AWTEventListener listener = new AWTEventListener ()
    {
        public void eventDispatched ( AWTEvent event )
        {
            // Event and component that recieved that event
            MouseEvent me = ( MouseEvent ) event;
            Component c = me.getComponent ();

            // Ignoring mouse events from any other frame
            if ( SwingUtilities.getWindowAncestor ( c ) == frame )
            {
                if ( event.getID () == MouseEvent.MOUSE_PRESSED )
                {
                    System.out.println ( "Mouse pressed on " + c.getClass ().getCanonicalName () );
                }
                if ( event.getID () == MouseEvent.MOUSE_RELEASED )
                {
                    System.out.println ( "Mouse released on " + c.getClass ().getCanonicalName () );
                }
                if ( event.getID () == MouseEvent.MOUSE_ENTERED )
                {
                    System.out.println ( "Mouse entered " + c.getClass ().getCanonicalName () );
                }
                if ( event.getID () == MouseEvent.MOUSE_EXITED )
                {
                    System.out.println ( "Mouse exited " + c.getClass ().getCanonicalName () );
                }
            }
        }
    };
    Toolkit.getDefaultToolkit ().addAWTEventListener ( listener, AWTEvent.MOUSE_EVENT_MASK );

    frame.pack ();
    frame.setLocationRelativeTo ( null );
    frame.setVisible ( true );
}

请注意，此侦听器将通知您有关任何框架/对话框/窗口/弹出窗口内的每个鼠标事件。这就是为什么你应该将你的动作限制在某个特定的框架，就像我在示例中所做的那样，以防你不需要来自其他框架/窗口的事件/ ...//>

顺便说一下，您可以使用相同的方法轻松地全局收听其他一些事件（例如关键事件）。例如 - 使用AWTEvent.KEY_EVENT_MASK键而不是AWTEvent.MOUSE_EVENT_MASK并将AWTEvent转换为KeyEvent而不是MouseEvent。

Answer 2

在最好的时候，这将是一个充满混乱和痛苦的世界......

在此处Global Event Listeners with AWTEventListener & how to pull MouseEvent's from it查看替代概念。基本上它是一个全球鼠标监听器。你需要做很多工作才能让它为你工作（检查孩子属于父母等），但它确实有效。

Answer 3

尝试使用MouseEvent Class，使用静态方法MOUSE_CLICKED

有关详细信息，请参阅此处：

http://docs.oracle.com/javase/6/docs/api/java/awt/event/MouseEvent.html

请参阅roseindia的这个例子

import java.awt.*;
import java.awt.event.*;

public class MouseClick {
  Label lbl;
  public static void main(String[] args) {
  MouseClick MC = new MouseClick();
  }

  public MouseClick(){
  Frame f = new Frame("Checking the mouse click");
  Panel p = new Panel();
  Button button = new Button("Click Me");
  button.addMouseListener(new MyMouseListener());
  p.add(button, BorderLayout.NORTH);
  f.add(p,BorderLayout.NORTH);
  lbl = new Label("Roseindia.net");
  f.add(lbl, BorderLayout.CENTER);
  f.addWindowListener(new WindowAdapter(){
  public void windowClosing(WindowEvent we){
  System.exit(0);
  }
  });
  f.setSize(400,400);
  f.setVisible(true);
  }

  public class MyMouseListener extends MouseAdapter{
  public void mouseClicked(MouseEvent me){
  String str = lbl.getText();
  if (str.equals("Roseindia.net")){
  lbl.setText("You have clicke the button.");
  }
  else if (str.equals("You have clicke the button.")){
  lbl.setText("Roseindia.net");
  }
  }
  }
}

请参阅Oracle中的此示例

 public class MouseEventDemo ... implements MouseListener {
            //where initialization occurs:
            //Register for mouse events on blankArea and the panel.
            blankArea.addMouseListener(this);
            addMouseListener(this);
        ...

        public void mousePressed(MouseEvent e) {
           saySomething("Mouse pressed; # of clicks: "
                        + e.getClickCount(), e);
        }

        public void mouseReleased(MouseEvent e) {
           saySomething("Mouse released; # of clicks: "
                        + e.getClickCount(), e);
        }

        public void mouseEntered(MouseEvent e) {
           saySomething("Mouse entered", e);
        }

        public void mouseExited(MouseEvent e) {
           saySomething("Mouse exited", e);
        }

        public void mouseClicked(MouseEvent e) {
           saySomething("Mouse clicked (# of clicks: "
                        + e.getClickCount() + ")", e);
        }

        void saySomething(String eventDescription, MouseEvent e) {
            textArea.append(eventDescription + " detected on "
                            + e.getComponent().getClass().getName()
                            + "." + newline);
        }
    }

查看单击鼠标按钮的时间，而不将mouselistener添加到所有组件

3 个答案: