问题描述
我正在尝试使用 Java Swing 创建一个透明窗口,并且我已经创建了该窗口。问题是当我调整窗口大小时,它会闪烁。我尝试将背景改为不透明的颜色。这解决了问题,但我希望窗口是透明的。我也试过
Toolkit.getDefaultToolkit().setDynamicLayout(true);
,
Toolkit.getDefaultToolkit().getDesktopProperty("awt.dynamicLayoutSupported");
,
System.setProperty("sun.awt.noerasebackground","true");
,
但无济于事。我试过 JWindow.setBounds
而不是 JWindow.setSize
,但这也没有效果。
import java.awt.Color;
import java.awt.Graphics;
import java.awt.MouseInfo;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JPanel;
import javax.swing.JWindow;
public class GlassWindow extends JPanel {
// RIGHT CLICK TO CLOSE
private static final long serialVersionUID = 1L;
private JWindow jwindow = new JWindow();
private boolean programCalledRender,shouldClose;
private int edges = 8;
private Color background = new Color(255,100,100);
public GlassWindow() {
int width = 1000,height = 750;
this.setopaque(false);
this.setSize(width,height);
jwindow.setSize(width,height);
jwindow.setBackground(new Color(0,0));
jwindow.setContentPane(this);
jwindow.setLocationRelativeto(null);
jwindow.setVisible(true);
jwindow.addMouseListener(new MouseListener() {
public void mouseClicked(MouseEvent e) {
if(e.getButton() == MouseEvent.BUTTON3) System.exit(0);
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousepressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
});
new Thread(() -> run()).start();
}
public void render() {
programCalledRender = true;
this.repaint();
}
private void run() {
int setTPS = 20,setFPS = 60;
long lastTime = System.nanoTime();
double delta = 0,frameDelta = 0;
while(true) {
if(shouldClose) break;
long Now = System.nanoTime();
delta += (Now-lastTime)/(1000000000/(double)setTPS);
frameDelta += (Now-lastTime)/(1000000000/(double)setFPS);
lastTime = Now;
while(delta > 0) {
tick();
delta--;
}
while(frameDelta > 0) {
render();
frameDelta--;
}
}
}
private void tick() {
}
@Override
public void paintComponent(Graphics g) {
if(!programCalledRender) return;
super.paintComponent(g);
int newWidth = MouseInfo.getPointerInfo().getLocation().x+20-jwindow.getX();
if(newWidth != jwindow.getWidth()) {
jwindow.setSize(newWidth,jwindow.getHeight());
}
if(background != null) {
g.setColor(background);
g.fillRect(edges,edges,jwindow.getWidth()-edges*2,jwindow.getHeight()-edges*2);
}
g.setColor(new Color(0,100));
for(int i = 0; i <= edges; i++) {
g.drawRect(i,i,jwindow.getWidth()-i*2,jwindow.getHeight()-i*2);
}
}
public static void main(String[] args) {
new GlassWindow();
}
}
如何在调整 JWindow 大小时防止闪烁?
感谢任何帮助。
解决方法
按照@camickr 的建议,我应该不在 render
方法中调整窗口大小。
为了停止闪烁,我删除了
int newWidth = MouseInfo.getPointerInfo().getLocation().x+20-jwindow.getX();
if(newWidth != jwindow.getWidth()) {
jwindow.setSize(newWidth,jwindow.getHeight());
}
来自 paintComponent(Graphics g)
方法。并添加
jwindow.addMouseMotionListener(new MouseMotionListener() {
public void mouseDragged(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {
int newWidth = MouseInfo.getPointerInfo().getLocation().x+20-jwindow.getX();
if(newWidth != jwindow.getWidth()) {
jwindow.setSize(newWidth,jwindow.getHeight());
}
}
});
到构造函数GlassWindow()
。