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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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.

/**
 * 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);
        }
    }
}