/*******************************************************************************

 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - initial implementation

 *******************************************************************************/

package org.eclipse.swt.internal.extension;

import org.eclipse.swt.internal.qt.OS;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Internal_PackageSupport;

public final class DisplayExtension extends Display {

private static final class VibraRunnable implements Runnable {

		private final int duration;

		private final Display display;

		boolean result;

		private VibraRunnable(int duration, Display display) {

			this.duration = duration;

			this.display = display;

		}

		public void run() {

			result= OS.MobileDevice_vibration(

                     Internal_PackageSupport.initializeMobileDevice(display),duration);

		}

	}

private static final class FlashBacklightsRunnable implements Runnable {

		private final Display display;

		private final int duration;

		boolean result;

		private FlashBacklightsRunnable(Display display, int duration) {

			this.display = display;

			this.duration = duration;

		}

		public void run() {

		result = OS.MobileDevice_flashLights(

		            Internal_PackageSupport.initializeMobileDevice(

		                display),duration);

		}

	}

/* Image types, same values as MIDP */

public static final int LIST_ELEMENT = 1;

public static final int CHOICE_GROUP_ELEMENT = 2;

public static final int ALERT = 3;

public DisplayExtension() {

    super();

}

/**

 * Determine the best width for the given image type.

 * @param imageType

 * @return Best height or -1 if invalid image type given.

 */

public static int getBestImageWidth(int imageType) {

    return getBestImageSize(imageType);

}

/**

 * Determine the best height for the given image type.

 * @param imageType

 * @return Best height or -1 if invalid image type given.

 */

public static int getBestImageHeight(int imageType) {

    return getBestImageSize(imageType);

}

/**

 * Gets the default display instance, but does not create one if it doesn't exist.

 * @return Default display if one has been initialized otherwise null

 */

public static Display getDisplayInstance() {

    return Internal_PackageSupport.getDisplayInstance();

}

/**

  * Flashes devices backlight.

  *

  * @param duration Duration in milliseconds.

  * @return false if no flashing happened because MIDlet was in background or

  *         feature is not supported.

 */

public static boolean flashLights( final int duration ){

	final Display display = getDisplayInstance();

	if (display == null || display.isDisposed() ) return false;

	FlashBacklightsRunnable runnable = new FlashBacklightsRunnable(display, duration);

	display.syncExec(runnable);

	return runnable.result;

}

/**

 * Vibrates device

 *

 * @param duration Duration in milliseconds.

 * @return false if no vibration happened because MIDlet was in background

 *         or feature is not supported.

 */

public static boolean startVibra(final int duration) {

	final Display display = getDisplayInstance();

	if (display == null || display.isDisposed() ) return false;

	VibraRunnable runnable = new VibraRunnable(duration, display);

	display.syncExec(runnable);

	return runnable.result;

}

/**

 *

 * @param imageType

 * @return

 */

private static int getBestImageSize(int imageType) {

    switch (imageType) {

    case LIST_ELEMENT:

    case CHOICE_GROUP_ELEMENT:

        return Style.pixelMetric(Style.QSTYLE_PM_SMALLICONSIZE);

    case ALERT:

        return Style.pixelMetric(Style.QSTYLE_PM_MESSAGEBOXICONSIZE);

    default:

        return -1;

    }

}

}