src/share/classes/javax/swing/plaf/nimbus/ToolBarSeparatorPainter.java

/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.plaf.nimbus;

import javax.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>
 */
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);
        }
    }
}