Java Swing GlassPane拖动性能
我试图使用GlassPane在Swing应用程序中进行可视化拖放,但遇到了一个问题,即拖动图像滞后于鼠标指针,有时甚至相当大。我该如何解决这个问题?我的玻璃窗格代码如下。谢谢
package dragui;
import java.awt.*;
import javax.swing.*;
import java.awt.event.MouseEvent;
import javax.swing.event.MouseInputAdapter;
public class GlassPane extends JComponent {
private int x=0, y=0, k=25,z=1;
private boolean showDot;
private MouseInputAdapter mia = new MouseInputAdapter(){
@Override
public void mouseDragged(MouseEvent me) {
setPos(me.getX(), me.getY());
}
@Override
public void mousePressed(MouseEvent me) {
setShow(true);
setPos(me.getX(), me.getY());
}
@Override
public void mouseReleased(MouseEvent me){
setShow(false);
setVisible(false);
}
};
public void setShow(boolean b){ this.showDot = b; }
public void paint(Graphics g) {
if (showDot) {
g.setColor(new Color(0.0f, 0.25f, 1.0f));
g.fillOval(x - k, y - k, 2*k, 2*k);
}
}
public void setPos(int x, int y) {
int tmpX = this.x, tmpY = this.y;
this.x = x; this.y = y;
repaint(tmpX - k , tmpY-k, 2*k+5, 2*k+5);
repaint(this.x-k, this.y-k, 2*k+5, 2*k+5);
}
public GlassPane() {
addMouseListener(mia);
addMouseMotionListener(mia);
setOpaque(false);
}
}
# 1 楼答案
也许您不应该在每次重新绘制时创建
new Color(0.0f, 0.25f, 1.0f)
对我来说,这场演出相当不错
# 2 楼答案
根据Javadoc报告
这是因为
paint(...)
实际上将绘画工作委托给了三种受保护的方法:paintComponent
、paintBorder
和paintChildren
。也就是说,试着用这个替换paint(...)