英文:
My mouse listeners don't seem to be working. Can someone help me? I have to move a ball to where my mouse is clicked and it is not working
问题
以下是翻译好的代码部分：
class Mouse implements MouseListener {
/**
* 当鼠标被点击时，将球移动到鼠标点击的位置 (x, y)
*/
public void mousePressed(MouseEvent e) {
ball.setX(e.getX());
ball.setY(e.getY());
if (e.isMetaDown()) {
ball.move(getX(), getY());
repaint();
}
if (e.isShiftDown()) {
ball.setRandomSpeed(20);
ball.setLocation(Math.random(), Math.random());
repaint();
}
}
}
该代码目前无法正常工作，我不知道出了什么问题。
英文:
This is the code but it is not working. I thought i added the right thing but the mouse listener is even responding. Much help is needed.
class Mouse implements MouseListener {
/**
* Moves the ball to the (x, y) location where the mouse has been clicked
*/
public void mousePressed(MouseEvent e) {
ball.setX(e.getX());
ball.setY(e.getY());
if (e.isMetaDown()) {
ball.move(getX(), getY());
repaint();
}
if (e.isShiftDown()) {
ball.setRandomSpeed(20);
ball.setLocation(Math.random(), Math.random());
repaint();
}
}
}
It is not working as you can see. I don't know what is wrong.
答案1
得分: -2
你正在使用<b>java.awt.event.MouseEvent</b>，对吗？
问题在于，你在<code>MouseEvent e</code>上调用的方法在你的情况下无法如预期般工作。<code>e.isMetaDown()</code>和<code>e.isShiftDown()</code>方法检查是否按下了Meta修改键或Shift修改键。我认为你正在寻找一种方法来检查是否按下了左侧（<code>MouseEvent.BUTTON1</code>）或右侧鼠标按钮（<code>MouseEvent.BUTTON3</code>）。你可以查阅此页面：
<https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/event/MouseEvent.html>
以了解可以在<code>MouseEvent</code>上调用的方法。
你可以尝试这两个小改变。（但是此代码未经测试！！）如果你想让别人测试代码，请发布一个最小的可复现示例，正如@DontKnowMuchBut Getting Better已经提到的那样。
class Mouse implements MouseListener {
/**
* 将球移动到鼠标点击的（x，y）位置
*/
public void mousePressed(MouseEvent e) {
ball.setX(e.getX());
ball.setY(e.getY());
if (e.getButton().equals(MouseEvent.BUTTON1)) {
ball.move(getX(), getY());
repaint();
}
if (e.getButton().equals(MouseEvent.BUTTON2)) {
ball.setRandomSpeed(20);
ball.setLocation(Math.random(), Math.random());
repaint();
}
}
}
希望这对你有帮助。
英文:
You are working with the <b>java.awt.event.MouseEvent</b>, right?
The problem is, that you invoke methods on the <code>MouseEvent e</code> that do not work like expected in your case. The Methods <code>e.isMetaDown()</code> and <code>e.isShiftDown()</code> check weather the Meta modfier or the Shift modifier is down on this event. I think you searches for a method to check if you pressed the left (<code> MouseEvent.BUTTON1</code>) or right mouse button (<code>MouseEvent.BUTTON3</code>). You can consult this page:
<https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/event/MouseEvent.html>
to inform yoursef about the Methods that can be invoked on <code>MouseEvent</code>s.
You could try these two small changes. (But this code is not tested!!) If you want somebody to test the code, then please post a minimal reproducible example as @DontKnowMuchBut Getting Better already mentioned.
class Mouse implements MouseListener {
/**
* Moves the ball to the (x, y) location where the mouse has been clicked
*/
public void mousePressed(MouseEvent e) {
ball.setX(e.getX());
ball.setY(e.getY());
if (e.getButton().equals(MouseEvent.BUTTON1)) {
ball.move(getX(), getY());
repaint();
}
if (e.getButton().equals(MouseEvent.BUTTON2)) {
ball.setRandomSpeed(20);
ball.setLocation(Math.random(), Math.random());
repaint();
}
}
}
I hope this is helpfull.
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