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A Java cross-platform look and feel for JRE 1.6u17 and later. This is developed from Synth, and is based on forms seen in sea glass, that is, bits of glass washed up on the shore by the sea.
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/*
 * Copyright (c) 2009 Kathryn Huxtable and Kenneth Orr.
 *
 * This file is part of the SeaGlass Pluggable Look and Feel.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * $Id$
 */
package com.seaglasslookandfeel.painter;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Shape;

import javax.swing.JComponent;

import com.seaglasslookandfeel.effect.Effect;
import com.seaglasslookandfeel.effect.SeaGlassDropShadowEffect;
import com.seaglasslookandfeel.effect.SeaGlassInternalShadowEffect;
import com.seaglasslookandfeel.painter.AbstractRegionPainter.PaintContext.CacheMode;
import com.seaglasslookandfeel.painter.util.ShapeGenerator.CornerSize;

/**
 * ProgressBarPainter implementation.
 */
public final class ProgressBarPainter extends AbstractCommonColorsPainter {
    public static enum Which {
        BACKGROUND_ENABLED,
        BACKGROUND_DISABLED,

        FOREGROUND_ENABLED,
        FOREGROUND_ENABLED_FINISHED,
        FOREGROUND_ENABLED_INDETERMINATE,
        FOREGROUND_DISABLED,
        FOREGROUND_DISABLED_FINISHED,
        FOREGROUND_DISABLED_INDETERMINATE,
    }

    private Color                        progressBarTrackInteriorEnabled         = decodeColor("progressBarTrackInterior");
    private Color                        buttonInteriorBaseSelected              = decodeColor("buttonInteriorBaseSelected");
    private Color                        progressBarTrackBase                    = decodeColor("progressBarTrackBase");

    private Color                        progressBarTrackInteriorDisabled        = disable(progressBarTrackInteriorEnabled);
    private TwoColors                    progressBarTrackEnabled                 = new TwoColors(deriveColor(progressBarTrackBase,
                                                                                     -0.000749f, 0.005236f, 0f, 0), progressBarTrackBase);
    private TwoColors                    progressBarTrackDisabled                = disable(progressBarTrackEnabled);
    private Color                        progressBarEndEnabled                   = deriveColor(buttonInteriorBaseSelected, 0.006370f,
                                                                                     0.274445f, -0.074510f, 0);
    private Color                        progressBarEndDisabled                  = disable(progressBarEndEnabled);

    private FourColors                   progressBarEnabled                      = getCommonInteriorColors(CommonControlState.SELECTED);
    private FourColors                   progressBarDisabled                     = disable(progressBarEnabled);

    private FourColors                   progressBarIndeterminatePatternEnabled  = getCommonInteriorColors(CommonControlState.ENABLED);
    private FourColors                   progressBarIndeterminatePatternDisabled = disable(progressBarIndeterminatePatternEnabled);

    private Effect                       dropShadow                              = new SeaGlassDropShadowEffect();
    private SeaGlassInternalShadowEffect internalShadow                          = new SeaGlassInternalShadowEffect();

    private Which                        state;
    private PaintContext                 ctx;
    private CommonControlState            type;

    public ProgressBarPainter(Which state) {
        super();
        this.state = state;
        this.ctx = new PaintContext(CacheMode.FIXED_SIZES);
        type = getButtonType(state);
    }

    @Override
    protected void doPaint(Graphics2D g, JComponent c, int width, int height, Object[] extendedCacheKeys) {
        switch (state) {
        case BACKGROUND_ENABLED:
            paintTrack(g, width, height);
            break;
        case BACKGROUND_DISABLED:
            paintTrack(g, width, height);
            break;
        case FOREGROUND_ENABLED:
            paintBar(g, width, height, false);
            break;
        case FOREGROUND_ENABLED_FINISHED:
            paintBar(g, width, height, true);
            break;
        case FOREGROUND_ENABLED_INDETERMINATE:
            paintIndeterminateBar(g, width, height);
            break;
        case FOREGROUND_DISABLED:
            paintBar(g, width, height, false);
            break;
        case FOREGROUND_DISABLED_FINISHED:
            paintBar(g, width, height, true);
            break;
        case FOREGROUND_DISABLED_INDETERMINATE:
            paintIndeterminateBar(g, width, height);
            break;
        }
    }

    @Override
    protected PaintContext getPaintContext() {
        return ctx;
    }

    private CommonControlState getButtonType(Which state) {
        switch (state) {
        case BACKGROUND_DISABLED:
        case FOREGROUND_DISABLED:
        case FOREGROUND_DISABLED_FINISHED:
        case FOREGROUND_DISABLED_INDETERMINATE:
            return CommonControlState.DISABLED;
        case BACKGROUND_ENABLED:
        case FOREGROUND_ENABLED:
        case FOREGROUND_ENABLED_FINISHED:
        case FOREGROUND_ENABLED_INDETERMINATE:
            return CommonControlState.ENABLED;
        }
        return null;
    }

    private void paintTrack(Graphics2D g, int width, int height) {
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        Shape s = shapeGenerator.createRoundRectangle(2, 2, width - 5, height - 5, CornerSize.ROUND_HEIGHT_DRAW);
        if (state != Which.BACKGROUND_DISABLED) {
            dropShadow.fill(g, s);
        }
        g.setPaint(getProgressBarBorderPaint(s, type));
        g.draw(s);

        s = shapeGenerator.createRoundRectangle(3, 3, width - 6, height - 6, CornerSize.ROUND_HEIGHT);
        g.setPaint(getProgressBarTrackPaint(s, type));
        g.fill(s);

        s = shapeGenerator.createInternalDropShadowRounded(3, 3, width - 6, height - 8);
        internalShadow.fill(g, s, true, true);
    }

    private void paintBar(Graphics2D g, int width, int height, boolean isFinished) {
        Shape s = shapeGenerator.createRectangle(0, 0, width, height);
        g.setPaint(getProgressBarPaint(s, type));
        g.fill(s);

        if (!isFinished) {
            s = shapeGenerator.createRectangle(width - 1, 0, 1, height);
            g.setPaint(getProgressBarEndPaint(s, type));
            g.fill(s);
        }
    }

    private void paintIndeterminateBar(Graphics2D g, int width, int height) {
        Shape s = shapeGenerator.createRectangle(0, 0, width, height);
        g.setPaint(getProgressBarPaint(s, type));
        g.fill(s);

        s = shapeGenerator.createProgressBarIndeterminatePattern(0, 0, width, height);
        g.setPaint(getProgressBarIndeterminatePaint(s, type));
        g.fill(s);
    }

    public Paint getProgressBarEndPaint(Shape s, CommonControlState type) {
        return getProgressBarEndColor(type);
    }

    private Color getProgressBarEndColor(CommonControlState type) {
        switch (type) {
        case ENABLED:
            return progressBarEndEnabled;
        case DISABLED:
            return progressBarEndDisabled;
        }
        return null;
    }

    public Paint getProgressBarBorderPaint(Shape s, CommonControlState type) {
        TwoColors colors = getProgressBarBorderColors(type);
        return createVerticalGradient(s, colors);
    }

    private TwoColors getProgressBarBorderColors(CommonControlState type) {
        switch (type) {
        case ENABLED:
            return progressBarTrackEnabled;
        case DISABLED:
            return progressBarTrackDisabled;
        }
        return null;
    }

    public Paint getProgressBarTrackPaint(Shape s, CommonControlState type) {
        return getProgressBarTrackColors(type);
    }

    private Color getProgressBarTrackColors(CommonControlState type) {
        switch (type) {
        case ENABLED:
            return progressBarTrackInteriorEnabled;
        case DISABLED:
            return progressBarTrackInteriorDisabled;
        }
        return null;
    }

    public Paint getProgressBarPaint(Shape s, CommonControlState type) {
        FourColors colors = getProgressBarColors(type);
        return createVerticalGradient(s, colors);
    }

    public Paint getProgressBarIndeterminatePaint(Shape s, CommonControlState type) {
        FourColors colors = getProgressBarIndeterminateColors(type);
        return createVerticalGradient(s, colors);
    }

    private FourColors getProgressBarColors(CommonControlState type) {
        switch (type) {
        case ENABLED:
            return progressBarEnabled;
        case DISABLED:
            return progressBarDisabled;
        }
        return null;
    }

    private FourColors getProgressBarIndeterminateColors(CommonControlState type) {
        switch (type) {
        case ENABLED:
            return progressBarIndeterminatePatternEnabled;
        case DISABLED:
            return progressBarIndeterminatePatternDisabled;
        }
        return null;
    }
}