基本上，我必须简单地绘制文本“鼠标输入”，然后是它的坐标。当未实现 mouseMoved 时，我的代码会成功执行此操作。如果是，它永远不会显示鼠标进入并直接转到“鼠标移动到”。我可以理解 mouseMoved 是如何做到这一点的，因为进入面板也会在该位置移动鼠标。我已经尝试将移动存储在矢量中并显示它们（对于这个项目来说还不是必需的），但它仍然没有绘制鼠标输入的内容。这让我怀疑有更深层次的原因造成了这种情况。有简单的解决方法吗？
我为未完成的原始代码道歉（未完成，因为它还没有完成我需要它做的所有事情，但它确实可以使用它的 GUI 对应物编译和运行）。
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import javax.swing.*;
public class DrawingArea extends JPanel {
int x1, x2, y1, y2;
int shapeType;
char mouseAction;
Vector<String> eventList = new Vector<String>();
public DrawingArea() {
initialize();
}
public void initialize() {
addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent m) {
x1 = m.getX();
y1 = m.getY();
mouseAction = 'a';
shapeType = 0;
repaint();
}
public void mouseExited (MouseEvent m) {
x1 = m.getX();
y1 = m.getY();
mouseAction = 'b';
shapeType = 0;
repaint();
}
public void mousePressed(MouseEvent m) {
x1 = m.getX();
y1 = m.getY();
mouseAction = 'd';
shapeType = 0;
repaint();
}
public void mouseReleased(MouseEvent m) {
x2 = m.getX();
y2 = m.getY();
repaint();
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseMoved (MouseEvent m) {
x2 = m.getX();
y2 = m.getY();
mouseAction = 'c';
shapeType = 0;
repaint();
}
public void mouseDragged(MouseEvent m) {
x2 = m.getX();
y2 = m.getY();
repaint();
}
});
}
public void output(String event, MouseEvent m) {
}
public void setShapeType(int num) {
if (num == 1) {
shapeType = 1;
mouseAction = 'z';
repaint();
}
else if (num == 2) {
shapeType = 2;
mouseAction = 'z';
repaint();
}
else if (num == 3) {
shapeType = 0;
mouseAction = 'z';
repaint();
}
}
public void paint(Graphics g) {
super.paint(g);
if (shapeType == 1) {
g.drawString("Rectangle", 25,25);
}
else if (shapeType == 2)
g.drawString("Circle", 25, 25);
if (mouseAction == 'a') {
g.drawString("Mouse entered at (" + x1+ ", " + y1 + ")", 25, 25);
}
else if (mouseAction == 'b') {
g.drawString("Mouse exited at (" + x1 + ", " + y1 + ")", 25, 25);
}
else if (mouseAction == 'c') {
g.drawString("Mouse moved at (" + x2 + ", " + y2 + ")", 25, 25);
}
else if (mouseAction == 'd')
g.drawString("Mouse clicked at (" + x1 + ", " + y1 + ")", 25, 25);
}
}
作为参考，这里是 GUI 代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SimpleGUI extends JFrame {
DrawingArea drawArea = new DrawingArea();
public SimpleGUI() {
createGUI();
}
public void createGUI() {
JFrame main = new JFrame();
main.setVisible(true);
main.setSize(500, 600);
main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel right = new JPanel(new GridLayout(20,1));
JPanel bottom = new JPanel();
JButton rect = new JButton("Rectangle");
JButton circ = new JButton("Circle");
JButton erase = new JButton("Erase");
JButton send = new JButton("Send");
JTextField text = new JTextField(30);
right.add(rect);
right.add(circ);
right.add(erase);
bottom.add(text);
bottom.add(send);
drawArea.setBackground(Color.WHITE);
main.add(drawArea, BorderLayout.CENTER);
main.add(right, BorderLayout.EAST);
main.add(bottom, BorderLayout.SOUTH);
rect.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
drawArea.setShapeType(1);
}
});
circ.addActionListener (new ActionListener(){
public void actionPerformed(ActionEvent e) {
drawArea.setShapeType(2);
}
});
erase.addActionListener (new ActionListener() {
public void actionPerformed(ActionEvent e) {
drawArea.setShapeType(3);
}
});
}
public static void main (String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new SimpleGUI();
}
});
}
}