/*
 * Copyright (c) 2010, Michael Grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package org.jowidgets.spi.impl.bridge.swt.awt.common.swt;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Frame;

import javax.swing.JApplet;

import org.eclipse.swt.SWT;
import org.eclipse.swt.awt.SWT_AWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.jowidgets.spi.impl.swt.common.image.SwtImageRegistry;
import org.jowidgets.spi.impl.swt.common.widgets.SwtControl;

class SwtAwtControlImpl extends SwtControl implements ISwtAwtControlSpi {

    private final JApplet applet;

    SwtAwtControlImpl(final Object parentUiReference, final SwtImageRegistry imageRegistry) {
        super(createComposite(parentUiReference), imageRegistry);

        final Composite innerComposite = new Composite(getUiReference(), SWT.EMBEDDED | SWT.NO_BACKGROUND);
        innerComposite.setLayout(new FillLayout());

        final Frame frame = SWT_AWT.new_Frame(innerComposite);
        this.applet = new JApplet();
        frame.add(applet);
        applet.setLayout(new BorderLayout());
    }

    private static Composite createComposite(final Object parentUiReference) {
        if (parentUiReference instanceof Composite) {
            final Composite result = new Composite((Composite) parentUiReference, SWT.NONE);
            result.setLayout(new FillLayout());
            result.addControlListener(new SwtAwtResizeListener());
            return result;
        }
        else {
            throw new IllegalArgumentException("parentUiReference must be a swt composite");
        }
    }

    @Override
    public Composite getUiReference() {
        return (Composite) super.getUiReference();
    }

    @Override
    public Container getAwtContainer() {
        return applet;
    }

    private static final class SwtAwtResizeListener extends ControlAdapter {

        private Rectangle lastRectangle;

        @Override
        public void controlResized(final ControlEvent event) {
            final Composite composite = (Composite) event.widget;
            final Rectangle rectangle = composite.getClientArea();
            if (lastRectangle != null) {
                final int dy = rectangle.height - lastRectangle.height;
                final int dx = rectangle.width - lastRectangle.width;
                if (dx > 0 || dy > 0) {
                    final GC graphicContext = new GC(composite);
                    try {
                        graphicContext.fillRectangle(rectangle.x, lastRectangle.height, rectangle.width, dy);
                        graphicContext.fillRectangle(lastRectangle.width, rectangle.y, dx, rectangle.height);
                    }
                    finally {
                        graphicContext.dispose();
                    }
                }
            }
            lastRectangle = rectangle;
        }
    }
}