X-Git-Url: http://secure.phpeclipse.com

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/DelegatingDragAdapter.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/DelegatingDragAdapter.java
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+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/DelegatingDragAdapter.java
@@ -0,0 +1,129 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package net.sourceforge.phpdt.internal.ui.dnd;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+//incastrix
+//import org.eclipse.jface.text.Assert;
+import org.eclipse.core.runtime.Assert;
+import org.eclipse.swt.dnd.DragSource;
+import org.eclipse.swt.dnd.DragSourceEvent;
+import org.eclipse.swt.dnd.DragSourceListener;
+import org.eclipse.swt.dnd.Transfer;
+import org.eclipse.swt.dnd.TransferData;
+
+/**
+ * A delegating drag adapter negotiates between a set of
+ * <code>TransferDragSourceListener</code>s On <code>dragStart</code> the
+ * adapter determines the listener to be used for any further <code>drag*</code>
+ * callback.
+ */
+public class DelegatingDragAdapter implements DragSourceListener {
+
+	private TransferDragSourceListener[] fPossibleListeners;
+
+	private List fActiveListeners;
+
+	private TransferDragSourceListener fFinishListener;
+
+	public DelegatingDragAdapter(TransferDragSourceListener[] listeners) {
+		setPossibleListeners(listeners);
+	}
+
+	protected void setPossibleListeners(TransferDragSourceListener[] listeners) {
+		Assert.isNotNull(listeners);
+		Assert
+				.isTrue(fActiveListeners == null,
+						"Can only set possible listeners before drag operation has started"); //$NON-NLS-1$
+		fPossibleListeners = listeners;
+	}
+
+	/*
+	 * non Java-doc
+	 * 
+	 * @see DragSourceListener
+	 */
+	public void dragStart(DragSourceEvent event) {
+		fFinishListener = null;
+		boolean saveDoit = event.doit;
+		Object saveData = event.data;
+		boolean doIt = false;
+		List transfers = new ArrayList(fPossibleListeners.length);
+		fActiveListeners = new ArrayList(fPossibleListeners.length);
+
+		for (int i = 0; i < fPossibleListeners.length; i++) {
+			TransferDragSourceListener listener = fPossibleListeners[i];
+			event.doit = saveDoit;
+			listener.dragStart(event);
+			if (event.doit) {
+				transfers.add(listener.getTransfer());
+				fActiveListeners.add(listener);
+			}
+			doIt = doIt || event.doit;
+		}
+		if (doIt) {
+			((DragSource) event.widget).setTransfer((Transfer[]) transfers
+					.toArray(new Transfer[transfers.size()]));
+		}
+		event.data = saveData;
+		event.doit = doIt;
+	}
+
+	/*
+	 * non Java-doc
+	 * 
+	 * @see DragSourceListener
+	 */
+	public void dragSetData(DragSourceEvent event) {
+		fFinishListener = getListener(event.dataType);
+		if (fFinishListener != null)
+			fFinishListener.dragSetData(event);
+	}
+
+	/*
+	 * non Java-doc
+	 * 
+	 * @see DragSourceListener
+	 */
+	public void dragFinished(DragSourceEvent event) {
+		try {
+			if (fFinishListener != null) {
+				fFinishListener.dragFinished(event);
+			} else {
+				// If the user presses Escape then we get a dragFinished without
+				// getting a dragSetData before.
+				fFinishListener = getListener(event.dataType);
+				if (fFinishListener != null)
+					fFinishListener.dragFinished(event);
+			}
+		} finally {
+			fFinishListener = null;
+			fActiveListeners = null;
+		}
+	}
+
+	private TransferDragSourceListener getListener(TransferData type) {
+		if (type == null)
+			return null;
+
+		for (Iterator iter = fActiveListeners.iterator(); iter.hasNext();) {
+			TransferDragSourceListener listener = (TransferDragSourceListener) iter
+					.next();
+			if (listener.getTransfer().isSupportedType(type)) {
+				return listener;
+			}
+		}
+		return null;
+	}
+}