java 按下左键时如何检测鼠标移动？
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How to detect mouse moving while left button down?
提问by Bnymn
I would like to detect mouse moving, while the left button is pressed.
我想检测鼠标移动，同时按下左键。
I simply create a drawing application. I can detect the mouse move without any mouse pressed. But I want to detect WITH left mouse pressed.
我只是创建了一个绘图应用程序。我可以在没有按下任何鼠标的情况下检测鼠标移动。但我想检测按下鼠标左键。
I think there is not any listener for this. So, what is the idea to do that?
我认为没有任何听众可以解决这个问题。那么，这样做的想法是什么？
采纳答案by Eternal Noob
回答by Jeff Storey
component.addmouseMotionListener(new MouseAdapter() {
public void mouseDragged(MouseEvent evt) {
if ( SwingUtilities.isLeftMouseButton(evt)) {
// do your stuff here
}
}
});
回答by camickr
In your MouseMotionListener you can check for this using:
在您的 MouseMotionListener 中，您可以使用以下方法检查：
SwingUtilities.isLeftMouseButton(me.getPoint())
and you would listen for the mouseDragged event.
你会监听 mouseDragged 事件。
回答by DGH
I think there might be some sort of mouse drag listener, but if not...
我认为可能有某种鼠标拖动侦听器，但如果没有......
Capture the mouse button down and up events. In those events, set a boolean such as leftButtonIsDown = true(unless there's already some easy way to query that) and then in the mouse movement events use a block like if (leftButtonIsDown)
捕获鼠标按下和按下事件。在这些事件中，设置一个布尔值，例如leftButtonIsDown = true（除非已经有一些简单的方法可以查询），然后在鼠标移动事件中使用类似的块if (leftButtonIsDown)
