SWTcanvas无法在Windows上重绘，但在Linux上工作

this.canvas = new Canvas(shell, SWT.NO_BACKGROUND); 

我正在使用一个PaintListener：

 this.canvas.addPaintListener(new PaintListener() { @Override public void paintControl(PaintEvent e) { // Draw images synchronized (imageMarks) { for (ImageMark mark : Whiteboard.this.imageMarks) { Image image = Whiteboard.this.getImage(mark.id); Point position = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), mark.getPosition()); Point bounds = mark.getUnscaledBoundaries(Whiteboard.this.getCanvasSize()); e.gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, position.x, position.y, bounds.x, bounds.y); } } // Draw pencil marks synchronized (pencilMarks) { e.gc.setLineWidth(LINE_WIDTH); for (double[] line : Whiteboard.this.pencilMarks) { Point lastPosPoint = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), new ScaledPoint(line[0], line[2])); Point newPosPoint = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), new ScaledPoint(line[1], line[3])); e.gc.drawLine(lastPosPoint.x, lastPosPoint.y, newPosPoint.x, newPosPoint.y); } } // Draw pointer, assuming it's there if (pointerMark != null) { synchronized (pointerMark) { Point pos = ScaledPoint.toSWTPoint(Whiteboard.this.getCanvasSize(), pointerMark.getPosition()); if (pointerMark.isFlipped()) e.gc.drawImage(Whiteboard.pointerImageFlipped, pos.x, pos.y); else e.gc.drawImage(Whiteboard.pointerImage, pos.x, pos.y); } } } }); 

并通过canvas.redraw（）调用重绘canvas。 在64位的Linux上，这似乎没有任何问题，但奇怪的是，在64位Windows上，没有任何事情最终被抹去或重绘。 例如，如果屏幕被resize，铅笔标记也不会resize，它们最终会被剪切掉。 添加新标记（换句话说，当再次调用绘画监听器时），重新定位的标记重新绘制在旧窗口上，而窗口并不随窗口缩放。 换句话说，我相信canvas.redraw（）不会清除canvas。 有没有解决方法？