Question

我的JPanel名为panelCrtanje。如果按下它，我需要更改cBox状态。

final PadDraw drawPad = new PadDraw();
panelCrtanje.setLayout(new BorderLayout());
panelCrtanje.add(drawPad, BorderLayout.CENTER);

在我使用以下方法将drawPad添加到panelCrtanje之前，它可以工作：

private void panelCrtanjeMousePressed(java.awt.event.MouseEvent evt) {                                          
 slikaC.setSelected(true);
}

PadDraw看起来像这样

public PadDraw(){
    setDoubleBuffered(false);
    addMouseListener(new MouseAdapter(){
        public void mousePressed(MouseEvent e){
            oldX = e.getX();
            oldY = e.getY();
        }
    });

    addMouseMotionListener(new MouseMotionAdapter()){
        public void mouseDragged(MouseEvent e){
            currentX = e.getX();
            currentY = e.getY();
            if(graphics2D != null) {
             graphics2D.setStroke(new BasicStroke(18F,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND));
            graphics2D.drawLine(oldX, oldY, currentX, currentY);
            repaint();
            oldX = currentX;
            oldY = currentY;
            }
        }

    });
}

Answer 1

您需要正确使用MouseEvent。要使用它，该类需要实现MouseListener。然后你需要为鼠标事件创建一个监听器，如下所示：

panelCrtanje.addMouseListener();

然后使用MouseListener和MotionMouseListener

中需要的这些方法

@Override
public void mouseClicked(java.awt.event.MouseEvent e) {
    // TODO In HERE do what you want to do

}

@Override
public void mousePressed(java.awt.event.MouseEvent e) {
    // TODO Auto-generated method stub

}

@Override
public void mouseReleased(java.awt.event.MouseEvent e) {
    // TODO Auto-generated method stub

}

@Override
public void mouseEntered(java.awt.event.MouseEvent e) {
    // TODO Auto-generated method stub

}

@Override
public void mouseExited(java.awt.event.MouseEvent e) {
    // TODO Auto-generated method stub

单击鼠标时：mouseClicked 按住鼠标但不移动鼠标时：mousePressed 释放鼠标时：mouseReleased 当鼠标进入窗口时：mouseEntered 当鼠标离开窗口时：mouseExited

这就是你可以使用mouseListener做不同的事情。

Answer 2

你应该在MouseListener上注册一个panelCartanje，我使用匿名内部类来执行此操作。

    panelCrtanje.addMouseListener(new MouseAdapter(){
        @Override
        public void mousePressed(MouseEvent e) {
            /// cBox state change goes here . . .
        }

    });

Answer 3

这是解决方案

    MouseAdapter adap = new MouseAdapter(){
        public void mousePressed(MouseEvent e) {
        slikaC.setSelected(true);
    }
    };

如何检查jPanel是否被按下？

3 个答案: