Swing - 在 mouseReleased 下获取新组件

Question

这个问题可能掩盖了缺乏 Swing 知识的根本原因，但我似乎无法确定我做错了什么。本质上，我想检测一个组件中的 mousePressed，然后在鼠标下的任何组件被释放时接收 mouseReleased，而不是原始组件。

import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.event.MouseInputAdapter;
import net.miginfocom.swing.MigLayout;

public class TestMouseListener extends MouseInputAdapter {

    public void mouseEntered(MouseEvent arg0) {System.out.println("Entered " + arg0.getComponent());}
    public void mouseExited(MouseEvent arg0) {System.out.println("Exited " + arg0.getComponent());}
    public void mousePressed(MouseEvent arg0) {System.out.println("Pressed " + arg0.getComponent());}
    public void mouseReleased(MouseEvent arg0) {System.out.println("Released " + arg0.getComponent());}

    public static void main(String[] args){
        JFrame frame = new JFrame();
        frame.setLayout(new MigLayout());
        frame.setSize(400, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        TestPanel panel1 = new TestPanel("Panel 1");
        TestPanel panel2 = new TestPanel("Panel 2");
        panel1.add(new JLabel("Text1"));
        panel2.add(new JLabel("Text2"));
        frame.add(panel1);
        frame.add(panel2);
        TestMouseListener listener = new TestMouseListener();
        panel1.addMouseListener(listener);
        panel1.addMouseMotionListener(listener);
        panel2.addMouseListener(listener);
        panel2.addMouseMotionListener(listener);
        frame.setVisible(true);
    }
}
class TestPanel extends JPanel {
    String name;
    TestPanel(String name){ this.name = name; }
    public String toString(){ return name; }
}

因此，当我将鼠标悬停在面板 1 上时，单击并拖动到面板 2，然后松开，我得到以下信息：

Entered Panel 1
Pressed Panel 1
Exited Panel 1
Entered Panel 2
Released Panel 1

我如何获得我释放的面板？我希望 mouseReleased 事件会为 Panel 2 触发，但显然它不会。

Answer 1

存储一个保存您最近输入的组件的变量。每次触发MouseEntered事件时继续覆盖它。然后有一个方法，这样当你释放鼠标按钮时，你可以使用你最近输入的任何组件。

Component lastEntered;

private void MouseEntered(MouseEvent e) {
    lastEntered = e.getComponent;
}