/*
 * Copyright (c) 2011, H.Westphal
 * 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 jo-widgets.org 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.addons.map.swing;

import java.awt.Canvas;
import java.awt.Dimension;

import org.eclipse.swt.awt.SWT_AWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

abstract class AbstractSwtThread<T> extends Thread {

    interface IWidgetCallback<T> {
        void onWidgetCreated(T widget);
    }

    private final Canvas canvas;
    private final IWidgetCallback<T> callback;

    AbstractSwtThread(final Canvas canvas, final IWidgetCallback<T> callback) {
        this.canvas = canvas;
        this.callback = callback;
        setName("swt-" + System.currentTimeMillis());
        setDaemon(true);
    }

    @Override
    public void run() {
        while (!canvas.isDisplayable()) {
            try {
                Thread.sleep(100);
            }
            catch (final InterruptedException e) {
                Thread.currentThread().interrupt();
                return;
            }
        }
        final Display display = new Display();
        try {
            final Shell shell = SWT_AWT.new_Shell(display, canvas);
            shell.setLayout(new FillLayout());
            final T widget = createWidget(shell);
            final Dimension canvasSize = canvas.getSize();
            shell.setSize(canvasSize.width, canvasSize.height);
            display.asyncExec(new Runnable() {
                @Override
                public void run() {
                    callback.onWidgetCreated(widget);
                }
            });
            while (!shell.isDisposed()) {
                if (!display.readAndDispatch()) {
                    display.sleep();
                }
            }
        }
        finally {
            display.dispose();
        }
    }

    protected abstract T createWidget(Shell shell);

}