1 /*******************************************************************************

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

     3  * All rights reserved. This program and the accompanying materials

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

     5  * which accompanies this distribution, and is available at

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

     7  *

     8  * Contributors:

     9  *     Nokia Corporation - initial implementation

    10  *******************************************************************************/

    11 

    12 package org.eclipse.swt.internal.extension;

    13 

    14 import org.eclipse.swt.widgets.Display;

    15 import org.eclipse.swt.widgets.Internal_PackageSupport;

    16 

    17 public final class DisplayExtension extends Display {

    18 

    19 /* Image types, same values as MIDP */

    20 public static final int LIST_ELEMENT = 1;

    21 public static final int CHOICE_GROUP_ELEMENT = 2;

    22 public static final int ALERT = 3;

    23 

    24 public DisplayExtension() {

    25     super();

    26 }

    27 

    28 /**

    29  * Determine the best width for the given image type.

    30  * @param imageType

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

    32  */

    33 public static int getBestImageWidth(int imageType) {

    34     return getBestImageSize(imageType);

    35 }

    36 

    37 /**

    38  * Determine the best height for the given image type.

    39  * @param imageType

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

    41  */

    42 public static int getBestImageHeight(int imageType) {

    43     return getBestImageSize(imageType);

    44 }

    45 

    46 /**

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

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

    49  */

    50 public static Display getDisplayInstance() {

    51     return Internal_PackageSupport.getDisplayInstance();

    52 }

    53 

    54 private static int getBestImageSize(int imageType) {

    55     switch (imageType) {

    56     case LIST_ELEMENT:

    57     case CHOICE_GROUP_ELEMENT:

    58         return Style.pixelMetric(Style.QSTYLE_PM_SMALLICONSIZE);

    59     case ALERT:

    60         return Style.pixelMetric(Style.QSTYLE_PM_MESSAGEBOXICONSIZE);

    61     default:

    62         return -1;

    63     }

    64 }

    65 }