1) Moved net.sourceforge.phpeclipse.ui\src\net\sourceforge\phpdt back to net.sourcefo...

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / ui / dnd / DelegatingDragAdapter.java

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
new file mode 100644 (file)
index 0000000..afe5479
--- /dev/null
+++ 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;
+       }
+}