javax.swing.JComponent#getTreeLock ( )源码实例Demo

/**
 * @param component The component to generate an image of.
 * @return The newly created image.
 */
public static Img getImage(JComponent component) {
    Img offscreen = null;
    synchronized (component.getTreeLock()) {
        Graphics2D gc = null;
        try {
            Rectangle bounds = component.getVisibleRect();
            offscreen = Img.create(component.getGraphicsConfiguration(), bounds.width, bounds.height, Transparency.TRANSLUCENT);
            gc = offscreen.getGraphics();
            gc.translate(-bounds.x, -bounds.y);
            component.paint(gc);
        } catch (Exception exception) {
            Log.error(exception);
        } finally {
            if (gc != null) {
                gc.dispose();
            }
        }
    }
    return offscreen;
}
 

protected void layoutContainerImmediately(JComponent parent) {
	synchronized (parent.getTreeLock()) {
		Map<JComponent, Rectangle> destMap = getDestinationMap(parent);
		for (Entry<JComponent, Rectangle> entry : destMap.entrySet()) {
			entry.getKey().setBounds(entry.getValue());
		}
	}
	parent.repaint();
}
 

public static void setSubcomponentsNotOpaque(JComponent j) {
    synchronized(j.getTreeLock()) {
        iterateOverOpaqueLayersComponents(j);
    }
}