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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package sun.awt.windows;

import java.awt.Component;
import java.awt.Cursor;
import java.awt.Image;
import java.awt.Point;
import java.awt.datatransfer.DataFlavor;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;

import java.awt.datatransfer.Transferable;

import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.InvalidDnDOperationException;

import java.awt.event.InputEvent;

import java.util.Map;

import sun.awt.dnd.SunDragSourceContextPeer;

TBC

Since:1.2
/** * <p> * TBC * </p> * * @since 1.2 * */
final class WDragSourceContextPeer extends SunDragSourceContextPeer { public void startSecondaryEventLoop(){ WToolkit.startSecondaryEventLoop(); } public void quitSecondaryEventLoop(){ WToolkit.quitSecondaryEventLoop(); } private static final WDragSourceContextPeer theInstance = new WDragSourceContextPeer(null);
construct a new WDragSourceContextPeer. package private
/** * construct a new WDragSourceContextPeer. package private */
private WDragSourceContextPeer(DragGestureEvent dge) { super(dge); } static WDragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException { theInstance.setTrigger(dge); return theInstance; } @Override protected void startDrag(Transferable trans, long[] formats, Map<Long, DataFlavor> formatMap) { long nativeCtxtLocal = 0; nativeCtxtLocal = createDragSource(getTrigger().getComponent(), trans, getTrigger().getTriggerEvent(), getTrigger().getSourceAsDragGestureRecognizer().getSourceActions(), formats, formatMap); if (nativeCtxtLocal == 0) { throw new InvalidDnDOperationException("failed to create native peer"); } int[] imageData = null; Point op = null; Image im = getDragImage(); int imageWidth = -1; int imageHeight = -1; if (im != null) { //image is ready (partial images are ok) try{ imageWidth = im.getWidth(null); imageHeight = im.getHeight(null); if (imageWidth < 0 || imageHeight < 0) { throw new InvalidDnDOperationException("drag image is not ready"); } //We could get an exception from user code here. //"im" and "dragImageOffset" are user-defined objects op = getDragImageOffset(); //op could not be null here BufferedImage bi = new BufferedImage( imageWidth, imageHeight, BufferedImage.TYPE_INT_ARGB); bi.getGraphics().drawImage(im, 0, 0, null); //we can get out-of-memory here imageData = ((DataBufferInt)bi.getData().getDataBuffer()).getData(); } catch (Throwable ex) { throw new InvalidDnDOperationException("drag image creation problem: " + ex.getMessage()); } } //We shouldn't have user-level exceptions since now. //Any exception leads to corrupted D'n'D state. setNativeContext(nativeCtxtLocal); WDropTargetContextPeer.setCurrentJVMLocalSourceTransferable(trans); if (imageData != null) { doDragDrop( getNativeContext(), getCursor(), imageData, imageWidth, imageHeight, op.x, op.y); } else { doDragDrop( getNativeContext(), getCursor(), null, -1, -1, 0, 0); } }
downcall into native code
/** * downcall into native code */
native long createDragSource(Component component, Transferable transferable, InputEvent nativeTrigger, int actions, long[] formats, Map<Long, DataFlavor> formatMap);
downcall into native code
/** * downcall into native code */
native void doDragDrop( long nativeCtxt, Cursor cursor, int[] imageData, int imgWidth, int imgHight, int offsetX, int offsetY); protected native void setNativeCursor(long nativeCtxt, Cursor c, int cType); }