SWTStrokeCanvas.java 文件源码

/**
 * Creates a new instance.
 * 
 * @param parent  the parent.
 * @param style  the style.
 */
public SWTStrokeCanvas(Composite parent, int style) {
    super(parent, style);
    addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            BasicStroke stroke = (BasicStroke) getStroke();
            if (stroke != null) {
                int x, y;
                Rectangle rect = getClientArea();
                x = (rect.width - 100) / 2;
                y = (rect.height - 16) / 2;
                Transform swtTransform = new Transform(e.gc.getDevice()); 
                e.gc.getTransform(swtTransform);
                swtTransform.translate(x, y);
                e.gc.setTransform(swtTransform);
                swtTransform.dispose();
                e.gc.setBackground(getDisplay().getSystemColor(
                        SWT.COLOR_BLACK));
                e.gc.setLineWidth((int) stroke.getLineWidth());
                e.gc.drawLine(10, 8, 90, 8);
            }
        }
    });
}