/*

 * Copyright 1999-2007 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt;

import java.awt.*;

public abstract class SunGraphicsCallback {

    public static final int HEAVYWEIGHTS = 0x1;

    public static final int LIGHTWEIGHTS = 0x2;

    public static final int TWO_PASSES = 0x4;

    public abstract void run(Component comp, Graphics cg);

    protected void constrainGraphics(Graphics g, Rectangle bounds) {

        if (g instanceof ConstrainableGraphics) {

            ((ConstrainableGraphics)g).constrain(bounds.x, bounds.y, bounds.width, bounds.height);

        } else {

            g.translate(bounds.x, bounds.y);

        }

        g.clipRect(0, 0, bounds.width, bounds.height);

    }

    public final void runOneComponent(Component comp, Rectangle bounds,

                                      Graphics g, Shape clip,

                                      int weightFlags) {

        if (comp == null || comp.getPeer() == null || !comp.isVisible()) {

            return;

        }

        boolean lightweight = comp.isLightweight();

        if ((lightweight && (weightFlags & LIGHTWEIGHTS) == 0) ||

            (!lightweight && (weightFlags & HEAVYWEIGHTS) == 0)) {

            return;

        }

        if (bounds == null) {

            bounds = comp.getBounds();

        }

        if (clip == null || clip.intersects(bounds)) {

            Graphics cg = g.create();

            try {

                constrainGraphics(cg, bounds);

                cg.setFont(comp.getFont());

                cg.setColor(comp.getForeground());

                if (cg instanceof Graphics2D) {

                    ((Graphics2D)cg).setBackground(comp.getBackground());

                } else if (cg instanceof Graphics2Delegate) {

                    ((Graphics2Delegate)cg).setBackground(

                        comp.getBackground());

                }

                run(comp, cg);

            } finally {

                cg.dispose();

            }

        }

    }

    public final void runComponents(Component[] comps, Graphics g,

                                    int weightFlags) {

        int ncomponents = comps.length;

        Shape clip = g.getClip();

            Rectangle newrect = clip.getBounds();

        }

        // A seriously sad hack--

        // Lightweight components always paint behind peered components,

        // even if they are at the top of the Z order. We emulate this

        // behavior by making two printing passes: the first for lightweights;

        // the second for heavyweights.

        //

        // ToDo(dpm): Either build a list of heavyweights during the

        // lightweight pass, or redesign the components array to keep

        // lightweights and heavyweights separate.

        if ((weightFlags & TWO_PASSES) != 0) {

            for (int i = ncomponents - 1; i >= 0; i--) {

                runOneComponent(comps[i], null, g, clip, LIGHTWEIGHTS);

            }

            for (int i = ncomponents - 1; i >= 0; i--) {

                runOneComponent(comps[i], null, g, clip, HEAVYWEIGHTS);

            }

        } else {

            for (int i = ncomponents - 1; i >= 0; i--) {

                runOneComponent(comps[i], null, g, clip, weightFlags);

            }

        }

    }

    public static final class PaintHeavyweightComponentsCallback

        extends SunGraphicsCallback

    {

        private static PaintHeavyweightComponentsCallback instance =

            new PaintHeavyweightComponentsCallback();

        private PaintHeavyweightComponentsCallback() {}

        public void run(Component comp, Graphics cg) {

            if (!comp.isLightweight()) {

                comp.paintAll(cg);

            } else if (comp instanceof Container) {

                runComponents(((Container)comp).getComponents(), cg,

                              LIGHTWEIGHTS | HEAVYWEIGHTS);

            }

        }

        public static PaintHeavyweightComponentsCallback getInstance() {

            return instance;

        }

    }

    public static final class PrintHeavyweightComponentsCallback

        extends SunGraphicsCallback

    {

        private static PrintHeavyweightComponentsCallback instance =

            new PrintHeavyweightComponentsCallback();

        private PrintHeavyweightComponentsCallback() {}

        public void run(Component comp, Graphics cg) {

            if (!comp.isLightweight()) {

                comp.printAll(cg);

            } else if (comp instanceof Container) {

                runComponents(((Container)comp).getComponents(), cg,

                              LIGHTWEIGHTS | HEAVYWEIGHTS);

            }

        }

        public static PrintHeavyweightComponentsCallback getInstance() {

            return instance;

        }

    }

}