Java AWT 鼠标事件

发布于 2024-12-21 15:09:36 字数 754 浏览 2 评论 0原文

我有一个使用 AWT 事件模型的小程序。它有一个布尔值，表示左按钮是否被按下。这是一个示例代码：

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
}

但似乎左按钮永远不会释放，即使在您实际这样做之后也是如此。可能是什么问题？

原文

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?

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呆 2024-12-28 15:09:36

这其中的根本是不正确的，

这些是鼠标事件，

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

因此，当您处理单击事件时，意味着鼠标被单击并释放。

所以我认为你必须使用鼠标按下而不是单击。

MouseEvent

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

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