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annotate dwt/dnd/ImageTransfer.d @ 106:ed7dd292bfb3

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Ported dwt.dnd.ImageTransfer
author Jacob Carlborg <doob@me.com>
date Wed, 31 Dec 2008 14:43:40 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2007, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Outhink - support for typeFileURL
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11 *
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12 * Port to the D programming language:
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13 * Jacob Carlborg <doob@me.com>
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14 *******************************************************************************/
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15 module dwt.dnd.ImageTransfer;
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17 import dwt.dwthelper.utils;
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19 import dwt.DWT;
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20 import dwt.graphics.Image;
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21 import dwt.graphics.ImageData;
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22 import dwt.internal.cocoa.NSData;
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23 import dwt.internal.cocoa.NSImage;
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24 import dwt.internal.cocoa.OS;
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25 import dwt.widgets.Display;
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27 import dwt.dnd.DND;
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28 import dwt.dnd.ByteArrayTransfer;
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29 import dwt.dnd.TransferData;
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31 /**
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32 * The class <code>ImageTransfer</code> provides a platform specific mechanism
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33 * for converting an Image represented as a java <code>ImageData</code> to a
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34 * platform specific representation of the data and vice versa.
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35 *
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36 * <p>An example of a java <code>ImageData</code> is shown below:</p>
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37 *
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38 * <code><pre>
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39 * Image image = new Image(display, "C:\temp\img1.gif");
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40 * ImageData imgData = image.getImageData();
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41 * </code></pre>
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42 *
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43 * @see Transfer
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44 *
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45 * @since 3.4
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46 */
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47 public class ImageTransfer : ByteArrayTransfer {
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49 static ImageTransfer _instance;
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50 static const String TIFF;
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51 static const int TIFFID;
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53 static this ()
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54 {
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55 _instance = new ImageTransfer();
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56 TIFF = OS.NSTIFFPboardType.getString();
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57 TIFFID = registerType(TIFF);
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58 }
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60 this() {
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61 }
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63 /**
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64 * Returns the singleton instance of the ImageTransfer class.
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65 *
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66 * @return the singleton instance of the ImageTransfer class
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67 */
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68 public static ImageTransfer getInstance() {
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69 return _instance;
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70 }
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72 /**
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73 * This implementation of <code>javaToNative</code> converts an ImageData object represented
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74 * by java <code>ImageData</code> to a platform specific representation.
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75 *
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76 * @param object a java <code>ImageData</code> containing the ImageData to be converted
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77 * @param transferData an empty <code>TransferData</code> object that will
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78 * be filled in on return with the platform specific format of the data
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79 *
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80 * @see Transfer#nativeToJava
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81 */
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82 public void javaToNative(Object object, TransferData transferData) {
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83 if (!checkImage(object) || !isSupportedType(transferData)) {
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84 DND.error(DND.ERROR_INVALID_DATA);
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85 }
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86 ImageData imgData = cast(ImageData) object;
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87 Image image = new Image(Display.getCurrent(), imgData);
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88 NSImage handle = image.handle;
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89 transferData.data = handle.TIFFRepresentation();
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90 image.dispose();
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91 }
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92
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93 /**
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94 * This implementation of <code>nativeToJava</code> converts a platform specific
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95 * representation of an image to java <code>ImageData</code>.
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96 *
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97 * @param transferData the platform specific representation of the data to be converted
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98 * @return a java <code>ImageData</code> of the image if the conversion was successful;
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99 * otherwise null
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100 *
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101 * @see Transfer#javaToNative
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102 */
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103 public Object nativeToJava(TransferData transferData) {
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104 if (!isSupportedType(transferData) || transferData.data is null) return null;
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105 NSData data = cast(NSData) transferData.data;
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106 if (data.length() is 0) return null;
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107 NSImage nsImage = cast(NSImage) (new NSImage()).alloc();
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108 nsImage.initWithData(data);
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109 //TODO: Image representation wrong???
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110 Image image = Image.cocoa_new(Display.getCurrent(), DWT.BITMAP, nsImage);
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111 ImageData imageData = image.getImageData();
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112 image.dispose();
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113 return imageData;
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114 }
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115
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116 protected int[] getTypeIds() {
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117 return [ TIFFID ];
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118 }
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119
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120 protected String[] getTypeNames() {
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121 return [ TIFF ];
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122 }
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123
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124 bool checkImage(Object object) {
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125 if (object is null || !(cast(ImageData) object)) return false;
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126 return true;
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127 }
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128
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129 protected bool validate(Object object) {
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130 return checkImage(object);
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131 }
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132 }