Java 语句导致 mouseClick 成为 Jpanel 中 MouseListener 的 mouseRelease

Question

我已经通过以下方式向我的 JPanel 添加了一个鼠标监听器。输出到 JPanel 的是从一组图像绘制到屏幕上的图像。

public class NewFrame extend JFrame {
    public New JFrame() {

        statusBar = new JLabel("Mouse Outdide Panel"); //displays events for mouse
        add(statusBar,BorderLayout.SOUTH); //add to JFrame
        MouseHandler handler = new MouseHandler(); 
        JPanelMap.addMouseListener(handler); //add both mouse listeners to JPanel
        JPanelMap.addMouseMotionListener(handler);
}
private class MouseHandler implements MouseListener,
        MouseMotionListener
    {
        public void mouseClicked(MouseEvent event) {

            statusBar.setText( String.format( "Clicked at [%d, %d]",
                event.getX() , event.getY() ) );
            int x = event.getX();
            int y = event.getY();

            mapObject.updateDockOrShip(x, y,text); //updates selected icon on screen
        }

        public void mousePressed(MouseEvent event) {
        }

        public void mouseReleased(MouseEvent event) {
            statusBar.setText( String.format( "Released at [%d, %d]",
                event.getX() , event.getY() ) );
            int x = event.getX();
            int y = event.getY();

            /*this is the troubleMaker, if i delete this line all "clicks"
              work everywhere on my JPanel. but if i leave it in, 
              clicks work in some areas of JPanel, and other legitimate clicks
              are recognized as mouseReleased in different area of JPanel
            */

            mapbject.checkDocks(x,y,tempint); //TROUBLE

        }
        public void mouseEntered( MouseEvent event )
        {
        } 

        public void mouseExited( MouseEvent event )
        {
        } 
        public void mouseDragged( MouseEvent event )
        {

        } 
        public void mouseMoved( MouseEvent event )
        { 
        } 

    }
}

我已经突出显示了给定代码中令人不安的语句。一旦我实现了这条线， map 的某些部分就可以通过点击来点击，而其他部分则不可点击，即使我仍然做了同样的点击。我认为鼠标点击就是鼠标点击，无论您在何处点击鼠标监听器，或者我假设错误或遗漏了什么。当该语句实现为 mouseReleased 操作时，鼠标单击的行为似乎发生了变化，但我不明白为什么。

Answer 1

我不确定这是否是您问题的根源，因为我不确定您所有代码的作用，但它看起来像是一个潜在问题:

您可能应该使用 mousePressed 方法覆盖而不是 mouseClicked，尤其是当它与绑定(bind)到 mouseReleased 的 Activity 配对时。 mouseClicked 方法表示鼠标在同一个点上被按下和释放，并且是敏感的，如果您在单击和释放之间移动鼠标，即使是轻微移动也不会调用。另一方面，mousePressed 会立即响应 mousePressed，这听起来像你想要的。

也许是这样:

private class MouseHandler extends MouseAdapter {
    @Override
    public void mousePressed(MouseEvent event) {

        statusBar.setText( String.format( "Pressed at [%d, %d]",
            event.getX() , event.getY() ) );
        int x = event.getX();
        int y = event.getY();

        mapObject.updateDockOrShip(x, y,text); //updates selected icon on screen
    }

    @Override
    public void mouseReleased(MouseEvent event) {
        statusBar.setText( String.format( "Released at [%d, %d]",
            event.getX() , event.getY() ) );
        int x = event.getX();
        int y = event.getY();

        /*this is the troubleMaker, if i delete this line all "clicks"
          work everywhere on my JPanel. but if i leave it in, 
          clicks work in some areas of JPanel, and other legitimate clicks
          are recognized as mouseReleased in different area of JPanel
        */

        mapbject.checkDocks(x,y,tempint); //TROUBLE

    }

    // since this extends MouseAdapter, all the other methods are not needed
}