toolbarseparatorpainter.java

java1.6众多例子参考

/*
 * @(#)ToolBarSeparatorPainter.java	1.2 08/02/19
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.java.swing.plaf.nimbus;

import com.sun.java.swing.plaf.nimbus.AbstractRegionPainter.PaintContext.CacheMode;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Insets;
import javax.swing.JComponent;

/**
 * A special painter implementation for tool bar separators in Nimbus.
 * The designer tool doesn't have support for painters which render
 * repeated patterns, but that's exactly what the toolbar separator design
 * is for Nimbus. This custom painter is designed to handle this situation.
 * When support is added to the design tool / code generator to deal with
 * repeated patterns, then we can remove this class.
 * <p>
 *
 * @version 1.2, 02/19/08
 */
final class ToolBarSeparatorPainter extends AbstractRegionPainter {
    private static final int SPACE = 3;
    private static final int INSET = 2;
    
    @Override
    protected PaintContext getPaintContext() {
        //the paint context returned will have a few dummy values. The
        //implementation of doPaint doesn't bother with the "decode" methods
        //but calculates where to paint the circles manually. As such, we
        //only need to indicate in our PaintContext that we don't want this
        //to ever be cached
        return new PaintContext(
                new Insets(1, 0, 1, 0),
                new Dimension(38, 7),
                false, CacheMode.NO_CACHING, 1, 1);
    }

    @Override
    protected void doPaint(Graphics2D g, JComponent c, int width, int height, Object[] extendedCacheKeys) {
        //it is assumed that in the normal orientation the separator renders
        //horizontally. Other code rotates it as necessary for a vertical
        //separator.
        g.setColor(c.getForeground());
        int y = height / 2;
        for (int i=INSET; i<=width-INSET; i+=SPACE) {
            g.fillRect(i, y, 1, 1);
        }
    }
    
}