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我有一個包含已添加到其中的自定義組件的面板。除了組件(有自己的鼠標偵聽器)被拖動時,它會正確繪製,開始繪製怪異。父面板不能正確重新繪製
有趣的是,如果我稍微重新大小的父面板現在它將塗料作爲預期。我知道父面板正在通過
super.paintComponent(g);
和打印語句粉刷面板
paintComponent(Graphics g):
方法內。當組件被拖動時(因爲組件被重新設置),我嘗試重新驗證它會失效。仍然我沒有成功,並想知道是否有人可以提供幫助。
有沒有一些地方我沒有正確重新粉刷,可能會導致這種行爲?
另外作爲一個附錄,我在面板和它的組件上都有一個鼠標監聽器,有沒有辦法讓單擊組件時,面板鼠標監聽器也會響應(除了回到父類組件)
這裏是我有
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Line2D;
import javax.swing.*;
public class testHome {
private JFrame frame;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
testHome window = new testHome();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public testHome() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new myPanel();
frame.getContentPane().add(panel, BorderLayout.CENTER);
}
}
class myPanel extends JPanel {
MyComponent comp;
public myPanel() {
super(null);
comp = new MyComponent(5, 5);
this.add(comp);
revalidate();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
Line2D.Double line = new Line2D.Double(10, 10, comp.getX(), comp.getY());
System.out.println(comp.getX() + " " + comp.getY());
g2d.draw(line);
}
}
class MyComponent extends JComponent implements MouseListener, MouseMotionListener {
int x;
int y;
int mx;
int my;
public MyComponent(int x, int y) {
this.setVisible(true);
this.setBounds(x, y, 15, 15);
this.x = x;
this.y = y;
addMouseMotionListener(this);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(Color.black);
g2d.fillRect(this.x, this.y, 15, 15);
}
@Override
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("dragging");
int dx = e.getX() - mx;
int dy = e.getY() - my;
this.setBounds(this.getX() + dx, this.getY() + dy, 15, 15);
}
@Override
public void mousePressed(MouseEvent e) {
mx = e.getX();
my = e.getY();
}
@Override
public void mouseMoved(MouseEvent e) {}
@Override
public void mouseClicked(MouseEvent e) {}
@Override
public void mouseEntered(MouseEvent e) {}
@Override
public void mouseExited(MouseEvent e) {}
@Override
public void mouseReleased(MouseEvent e) {}
}
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