Java RepaintManager.isDoubleBufferingEnabled方法代碼示例

import javax.swing.RepaintManager; //導入方法依賴的package包/類
@Override
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) {
    if (pageIndex >= getComponentCount()) {
        mLastPage = -1;
        return NO_SUCH_PAGE;
    }

    // We do the following trick to avoid going through the work twice,
    // as we are called twice for each page, the first of which doesn't
    // seem to be used.
    if (mLastPage != pageIndex) {
        mLastPage = pageIndex;
    } else {
        Component comp = getComponent(pageIndex);
        RepaintManager mgr = RepaintManager.currentManager(comp);
        boolean saved = mgr.isDoubleBufferingEnabled();
        mgr.setDoubleBufferingEnabled(false);
        mOkToPaint = true;
        comp.print(graphics);
        mOkToPaint = false;
        mgr.setDoubleBufferingEnabled(saved);
    }
    return PAGE_EXISTS;
}
 

import javax.swing.RepaintManager; //導入方法依賴的package包/類
/**
 * Immediately repaints the surface.
 *
 * <p/>It's possible to turn off double-buffering for just the repaint calls invoked directly on the non double
 * buffered component. This can be done by overriding paintImmediately() (which is called as a result of repaint)
 * and getting the current RepaintManager and turning off double buffering in the RepaintManager before calling
 * super.paintImmediately(g).
 *
 * @param x The X coord to start painting at.
 * @param y The Y coord to start painting at.
 * @param w The width of the region to paint.
 * @param h The height of the region to paint.
 */
public void paintImmediately(int x, int y, int w, int h)
{
    RepaintManager repaintManager = null;
    boolean save = true;

    if (!isDoubleBuffered())
    {
        repaintManager = RepaintManager.currentManager(this);
        save = repaintManager.isDoubleBufferingEnabled();
        repaintManager.setDoubleBufferingEnabled(false);
    }

    super.paintImmediately(x, y, w, h);

    if (repaintManager != null)
    {
        repaintManager.setDoubleBufferingEnabled(save);
    }
}
 

import javax.swing.RepaintManager; //導入方法依賴的package包/類
/**
 * Paints the component widget.
 */
@Override
protected final void paintWidget() {
    RepaintManager rm = RepaintManager.currentManager(null);
    boolean isDoubleBuffered = component instanceof JComponent && rm.isDoubleBufferingEnabled();
    if (isDoubleBuffered) {
        rm.setDoubleBufferingEnabled(false);
    }
    Graphics2D graphics = getGraphics();
    Rectangle bounds = getClientArea();
    AffineTransform previousTransform = graphics.getTransform();
    graphics.translate(bounds.x, bounds.y);
    //double zoomFactor = getScene().getZoomFactor();
    //graphics.scale(1 / zoomFactor, 1 / zoomFactor);
    if (componentVisible) {
        componentWrapper.doPaint(graphics);
    } else {
        component.paint(graphics);
    }
    graphics.setTransform(previousTransform);
    if (isDoubleBuffered) {
        rm.setDoubleBufferingEnabled(true);
    }
}
 

import javax.swing.RepaintManager; //導入方法依賴的package包/類
/**
 * Setting the <code>RepaintManager</code> like seen
 * <a href=http://java.sun.com/products/java-media/2D/samples/index.html>on the official examples for Java2D</a>
 * (link last time checked on 12.08.2008).<br>
 * This imitates the "On Screen" method used there and in some cases drastically improves performance (even when
 * DoubleBuffering of this <code>JComponent</code> is off the DoubleBuffering might still be on because the
 * DoubleBuffering is inherited from the main <code>JFrame</code>!).
 * 
 * @param x			the x coordinate for the bounding box to repaint
 * @param y			the y coordinate for the bounding box to repaint
 * @param width		the width
 * @param height	the height
 */
public void paintImmediately(int x, int y, int width, int height){
	RepaintManager repaintManager = null;
	boolean save = true;
	if (!isDoubleBuffered()) {
		repaintManager = RepaintManager.currentManager(this);
		save = repaintManager.isDoubleBufferingEnabled();
		repaintManager.setDoubleBufferingEnabled(false);
	}
	super.paintImmediately(x, y, width, height);

	if (repaintManager != null) repaintManager.setDoubleBufferingEnabled(save);
}