java 将鼠标侦听器添加到java中的矩形
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Adding a mouse listener to a rectangle in java
提问by Sam
As the title suggests, I am attempting to add an action listener to a basic shape on a window. I'm wondering if this is even possible? I'm getting errors when I attempt to add the listener.
正如标题所暗示的那样，我正在尝试向窗口上的基本形状添加一个动作侦听器。我想知道这是否可能？当我尝试添加侦听器时出现错误。
public static void main(String args[]) {
JFrame frame = new Main();
frame.setSize(300, 200);
frame.setVisible(true);
frame.setBackground(Color.BLUE);
}
Rectangle2D rect = new Rectangle2D.Double(60, 70, 120, 80);
public void paint(Graphics g) {
Graphics2D g1 = (Graphics2D)g;
g1.draw(rect);
g1.setPaint(Color.yellow);
g1.fill(rect);
}
Handlerclass handle = new Handlerclass();
rect.addMouseListener(handle);
public class Handlerclass implements MouseListener{
public void mouseClicked (MouseEvent e){
}
}
回答by Perception
You can't add a mouse listener to that object. If you are trying to detect mouse clicks within it then you want to add a mouse listener to whatever Swing container you are drawing the shape in, then use one of the contains...or intersects...methods.
您不能向该对象添加鼠标侦听器。如果您试图检测其中的鼠标点击，那么您希望向正在绘制形状的任何 Swing 容器添加一个鼠标侦听器，然后使用contains...或intersects...方法之一。
Check out the documentation for Rectangle2Dwhen you get a chance.
有机会时查看Rectangle2D的文档。
