/*
 * Copyright (c) 2013, 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.swt.common.widgets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.jowidgets.common.types.Dimension;
import org.jowidgets.common.types.Rectangle;
import org.jowidgets.common.widgets.factory.IGenericWidgetFactory;
import org.jowidgets.spi.graphics.IPaintListenerSpi;
import org.jowidgets.spi.impl.controller.PaintEventSpiImpl;
import org.jowidgets.spi.impl.controller.PaintObservable;
import org.jowidgets.spi.impl.swt.common.graphics.GraphicContextSpiImpl;
import org.jowidgets.spi.impl.swt.common.image.SwtImageRegistry;
import org.jowidgets.spi.widgets.ICanvasSpi;
import org.jowidgets.spi.widgets.setup.ICanvasSetupSpi;

public class CanvasImpl extends SwtComposite implements ICanvasSpi {

    private final PaintObservable paintObservable;

    public CanvasImpl(
        final IGenericWidgetFactory factory,
        final Object parentUiReference,
        final ICanvasSetupSpi setup,
        final SwtImageRegistry imageRegistry) {
        super(factory, new Canvas((Composite) parentUiReference, getStyle(setup)), imageRegistry);
        getUiReference().setBackgroundMode(SWT.INHERIT_DEFAULT);
        this.paintObservable = new PaintObservable();

        getUiReference().addPaintListener(new PaintListener() {
            @Override
            public void paintControl(final PaintEvent e) {
                final Dimension size = getSize();
                final Rectangle bounds = new Rectangle(0, 0, size.getWidth(), size.getHeight());
                final Rectangle clipBounds = new Rectangle(e.x, e.y, e.width, e.height);
                final GraphicContextSpiImpl graphicContext = new GraphicContextSpiImpl(e.gc, bounds, imageRegistry);
                paintObservable.firePaint(new PaintEventSpiImpl(graphicContext, clipBounds));
            }
        });
    }

    private static int getStyle(final ICanvasSetupSpi setup) {
        if (setup.isDoubleBuffering()) {
            return SWT.DOUBLE_BUFFERED;
        }
        else {
            return SWT.NONE;
        }
    }

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

    @Override
    public void scroll(
        final int sourceX,
        final int sourceY,
        final int sourceWidth,
        final int sourceHeight,
        final int destinationX,
        final int destinationY) {
        getUiReference().scroll(destinationX, destinationY, sourceX, sourceY, sourceWidth, sourceHeight, false);
    }

    @Override
    public void redraw() {
        redraw(false);
    }

    @Override
    public void redraw(final int x, final int y, final int width, final int height) {
        redraw(x, y, width, height, false);
    }

    @Override
    public void redraw(final boolean sync) {
        getUiReference().redraw();
        if (sync) {
            getUiReference().update();
        }
    }

    @Override
    public void redraw(final int x, final int y, final int width, final int height, final boolean sync) {
        getUiReference().redraw(x, y, width, height, false);
        if (sync) {
            getUiReference().update();
        }
    }

    @Override
    public void addPaintListener(final IPaintListenerSpi listener) {
        paintObservable.addPaintListener(listener);
    }

    @Override
    public void removePaintListener(final IPaintListenerSpi paintListener) {
        paintObservable.removePaintListener(paintListener);
    }

}