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好吧，我的问题是当您拖动鼠标时 mouseMoved 被冻结，这是 MouseMotionListener （ mouseMoved 和 mouseDragged ）中的方法之一。我想也许 mouseDragged 正在冻结 mouseMoved，如果有人可以帮助我使其不会那样做，那将非常棒。

import javax.swing.JFrame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;
import java.awt.Rectangle;
import java.lang.Runnable;
import java.awt.RenderingHints;
import java.awt.Graphics2D;
import java.awt.Color;

public class Window extends JFrame implements MouseMotionListener, Runnable {
    protected static int xWindow = 640;
    protected static int yWindow = 480;
    private Image dbi;
    private Graphics dbg;
    private int xMouse;
    private int yMouse;

    public void paint( Graphics g ) {
        dbi = createImage( getWidth(), getHeight() );
        dbg = dbi.getGraphics();
        paintComponent( dbg );
        g.drawImage( dbi, 0, 0, this );
    }

    public void paintComponent( Graphics g ) {
        Graphics2D g2d = ( Graphics2D ) g;
        g2d.setRenderingHint( RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON );
        g2d.setColor( Color.RED );
        g2d.drawString( "Mouse X: " + xMouse + " | Y: " + yMouse, 15, 40 );

        repaint();
    }

    public void mouseDragged( MouseEvent e ) {
        e.consume();
    }

    public void mouseMoved( MouseEvent e ) {
        xMouse = e.getX();
        yMouse = e.getY();
        e.consume();
    }

    public void run() {
        while ( true ) {
            try {
                Thread.sleep( 1 );
            } catch( Exception e ) {
                e.printStackTrace();
            }
        }
    }

}
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1 回答 1

2

您正在调用whichrepaint导致paintComponent以下方法调用链无限重复：

paint -> (manual call to) paintComponent

要利用 Swing 优化的绘制模型，最好不要在顶级容器中进行自定义绘制，例如JFrame. 将所有绘制功能提取到一个新的JComponent或JPanel基于的类并覆盖paintComponent. Swing 将调用paintComponent，repaint因此无需直接调用。别忘了打电话super.paintComponent(g)。

repaint从内部调用mouseMoved。

也不要调用Thread.sleep，这会阻塞EDT并导致 UI 冻结。Swing 提供了自己的并发对象，例如Swing Timers。

于 2013-03-22T12:53:52.090 回答