1 /* 2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.awt.windows; 27 28 import java.awt.Component; 29 import java.awt.Cursor; 30 import java.awt.Image; 31 import java.awt.Point; 32 import java.awt.image.BufferedImage; 33 import java.awt.image.DataBufferInt; 34 35 import java.awt.datatransfer.Transferable; 36 37 import java.awt.dnd.DragGestureEvent; 38 import java.awt.dnd.InvalidDnDOperationException; 39 40 import java.awt.event.InputEvent; 41 42 import java.util.Map; 43 44 import sun.awt.dnd.SunDragSourceContextPeer; 45 46 /** 47 * <p> 48 * TBC 49 * </p> 50 * 51 * @since JDK1.2 52 * 53 */ 54 55 final class WDragSourceContextPeer extends SunDragSourceContextPeer { 56 public void startSecondaryEventLoop(){ 57 WToolkit.startSecondaryEventLoop(); 58 } 59 public void quitSecondaryEventLoop(){ 60 WToolkit.quitSecondaryEventLoop(); 61 } 62 63 private static final WDragSourceContextPeer theInstance = 64 new WDragSourceContextPeer(null); 65 66 /** 67 * construct a new WDragSourceContextPeer. package private 68 */ 69 70 private WDragSourceContextPeer(DragGestureEvent dge) { 71 super(dge); 72 } 73 74 static WDragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException { 75 theInstance.setTrigger(dge); 76 return theInstance; 77 } 78 79 protected void startDrag(Transferable trans, 80 long[] formats, Map formatMap) { 81 82 long nativeCtxtLocal = 0; 83 84 nativeCtxtLocal = createDragSource(getTrigger().getComponent(), 85 trans, 86 getTrigger().getTriggerEvent(), 87 getTrigger().getSourceAsDragGestureRecognizer().getSourceActions(), 88 formats, 89 formatMap); 90 91 if (nativeCtxtLocal == 0) { 92 throw new InvalidDnDOperationException("failed to create native peer"); 93 } 94 95 int[] imageData = null; 96 Point op = null; 97 98 Image im = getDragImage(); 99 int imageWidth = -1; 100 int imageHeight = -1; 101 if (im != null) { 102 //image is ready (partial images are ok) 103 try{ 104 imageWidth = im.getWidth(null); 105 imageHeight = im.getHeight(null); 106 if (imageWidth < 0 || imageHeight < 0) { 107 throw new InvalidDnDOperationException("drag image is not ready"); 108 } 109 //We could get an exception from user code here. 110 //"im" and "dragImageOffset" are user-defined objects 111 op = getDragImageOffset(); //op could not be null here 112 BufferedImage bi = new BufferedImage( 113 imageWidth, 114 imageHeight, 115 BufferedImage.TYPE_INT_ARGB); 116 bi.getGraphics().drawImage(im, 0, 0, null); 117 118 //we can get out-of-memory here 119 imageData = ((DataBufferInt)bi.getData().getDataBuffer()).getData(); 120 } catch (Throwable ex) { 121 throw new InvalidDnDOperationException("drag image creation problem: " + ex.getMessage()); 122 } 123 } 124 125 //We shouldn't have user-level exceptions since now. 126 //Any exception leads to corrupted D'n'D state. 127 setNativeContext(nativeCtxtLocal); 128 WDropTargetContextPeer.setCurrentJVMLocalSourceTransferable(trans); 129 130 if (imageData != null) { 131 doDragDrop( 132 getNativeContext(), 133 getCursor(), 134 imageData, 135 imageWidth, imageHeight, 136 op.x, op.y); 137 } else { 138 doDragDrop( 139 getNativeContext(), 140 getCursor(), 141 null, 142 -1, -1, 143 0, 0); 144 } 145 } 146 147 /** 148 * downcall into native code 149 */ 150 151 native long createDragSource(Component component, 152 Transferable transferable, 153 InputEvent nativeTrigger, 154 int actions, 155 long[] formats, 156 Map formatMap); 157 158 /** 159 * downcall into native code 160 */ 161 162 native void doDragDrop( 163 long nativeCtxt, 164 Cursor cursor, 165 int[] imageData, 166 int imgWidth, int imgHight, 167 int offsetX, int offsetY); 168 169 protected native void setNativeCursor(long nativeCtxt, Cursor c, int cType); 170 171 }