Java AWT鼠标事件

Question

I have an applet that makes use of the AWT event model. It has a boolean that says if the left button is pressed or not. Here is a sample code:

public class Game extends Applet implements MouseListener
{
    boolean isLeftButtonPressed;

    public void init()
    {
        addMouseListener(this);
        isLeftButtonPressed = false;
    }

    public void paint(Graphics g)
    {
        g.drawString("Is Button Pressed: " + isLeftButtonPressed, 20, 20);
    }

@Override
public void mouseClicked(MouseEvent e)
    {
        isLeftButtonPressed = true;
        repaint();
}

    @Override
public void mouseReleased(MouseEvent e)
    {
        isLeftButtonPressed = false;
        repaint();
}

    //Other MouseListener methods not listed but have to be implemented
}

But it seems as if the left button is never released, even after you actually do so. What could be the problem?

Answer 1

Method mouseClicked will be called after mouseReleased method so value of isLgetButtonPressed will be true. You have to use MouseEvent.getButton() method to check which mouse button is pressed.

Answer 2

The fundamental in this is incorrect,

These are the mouse events,

MousePressed ->    a mouse button is pressed
MouseReleased ->   a mouse button is released
MouseClicked ->   a mouse button is clicked (pressed and released)

So, when you handle the click event that means mouse is clicked and released.

So i think you have to use mousepressed instead of clicked.

MouseEvent