bundles/org.eclipse.wst.xml.ui/src/org/eclipse/wst/xml/ui/views/contentoutline/AbstractXMLContentOutlineConfiguration.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2001, 2009 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Jens Lukowski/Innoopract - initial renaming/restructuring
  *
  *******************************************************************************/
 package org.eclipse.wst.xml.ui.views.contentoutline;

 import org.eclipse.core.runtime.IPath;
 import org.eclipse.jface.action.IMenuListener;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.util.LocalSelectionTransfer;
 import org.eclipse.jface.util.SafeRunnable;
 import org.eclipse.jface.util.TransferDragSourceListener;
 import org.eclipse.jface.util.TransferDropTargetListener;
 import org.eclipse.jface.viewers.IContentProvider;
 import org.eclipse.jface.viewers.ILabelProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.swt.dnd.DND;
 import org.eclipse.swt.dnd.DragSourceEvent;
 import org.eclipse.swt.dnd.DropTargetEvent;
 import org.eclipse.swt.dnd.Transfer;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.TableItem;
 import org.eclipse.swt.widgets.TreeItem;
 import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
 import org.eclipse.wst.sse.ui.internal.IReleasable;
 import org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration;
 import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;
 import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeContentProvider;
 import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeLabelProvider;
 import org.eclipse.wst.xml.ui.internal.contentoutline.XMLNodeActionManager;
 import org.eclipse.wst.xml.ui.internal.dnd.DragNodeCommand;
 import org.w3c.dom.Attr;
 import org.w3c.dom.Node;

 /**
  * Basic Outline Configuration for generic XML support.  Expects that the viewer's
  * input will be the DOM Model, and provides basic label and content providers.
  *
  * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration
  * @since 3.1
  */
 public abstract class AbstractXMLContentOutlineConfiguration extends ContentOutlineConfiguration {
 	private class ActionManagerMenuListener implements IMenuListener, IReleasable {
 		private XMLNodeActionManager fActionManager;
 		private TreeViewer fTreeViewer;

 		public ActionManagerMenuListener(TreeViewer viewer) {
 			fTreeViewer = viewer;
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see org.eclipse.jface.action.IMenuListener#menuAboutToShow(org.eclipse.jface.action.IMenuManager)
 		 */
 		public void menuAboutToShow(IMenuManager manager) {
 			if (fActionManager == null) {
 				fActionManager = createNodeActionManager(fTreeViewer);
 			}
 			if (fActionManager != null) {
 				fActionManager.fillContextMenu(manager, fTreeViewer.getSelection());
 			}
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see org.eclipse.wst.sse.ui.internal.IReleasable#release()
 		 */
 		public void release() {
 			fTreeViewer = null;
 			if (fActionManager != null) {
 				fActionManager.setModel(null);
 			}
 		}
 	}

 	private static class StatusLineLabelProvider extends JFaceNodeLabelProvider {
 		public StatusLineLabelProvider() {
 			super();
 		}

 		public String getText(Object element) {
 			if (element == null)
 				return null;

 			if (!(element instanceof Node)) {
 				return super.getText(element);
 			}

 			StringBuffer s = new StringBuffer();
 			Node node = (Node) element;
 			while (node != null) {
 				if (node.getNodeType() != Node.DOCUMENT_NODE) {
 					s.insert(0, super.getText(node));
 				}

 				if (node.getNodeType() == Node.ATTRIBUTE_NODE)
 					node = ((Attr) node).getOwnerElement();
 				else
 					node = node.getParentNode();

 				if (node != null && node.getNodeType() != Node.DOCUMENT_NODE) {
 					s.insert(0, IPath.SEPARATOR);
 				}
 			}
 			return s.toString();
 		}
 	}

 	private IContentProvider fContentProvider = null;

 	private ActionManagerMenuListener fContextMenuFiller = null;

 	private ILabelProvider fLabelProvider = null;

 	boolean fShowAttributes = false;

 	private ILabelProvider fSimpleLabelProvider;
 	private TransferDragSourceListener[] fTransferDragSourceListeners;

 	private TransferDropTargetListener[] fTransferDropTargetListeners;

 	/**
 	 * Create new instance of XMLContentOutlineConfiguration
 	 */
 	public AbstractXMLContentOutlineConfiguration() {
 		// Must have empty constructor to createExecutableExtension
 		super();
 	}

 	/**
 	 * Returns the NodeActionManager to use for the given treeViewer.
 	 * <p>
 	 * Not API. May be removed in the future.
 	 * </p>
 	 *
 	 * @param treeViewer
 	 *            the TreeViewer associated with this configuration
 	 * @return a node action manager for use with this tree viewer
 	 */
 	protected XMLNodeActionManager createNodeActionManager(TreeViewer treeViewer) {
 		return new XMLNodeActionManager((IStructuredModel) treeViewer.getInput(), treeViewer);
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getContentProvider(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	public IContentProvider getContentProvider(TreeViewer viewer) {
 		if (fContentProvider == null) {
 			fContentProvider = new JFaceNodeContentProvider();
 		}
 		return fContentProvider;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getLabelProvider(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	public ILabelProvider getLabelProvider(TreeViewer viewer) {
 		if (fLabelProvider == null) {
 			fLabelProvider = new JFaceNodeLabelProvider();
 		}
 		return fLabelProvider;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getMenuListener(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	public IMenuListener getMenuListener(TreeViewer viewer) {
 		if (fContextMenuFiller == null) {
 			fContextMenuFiller = new ActionManagerMenuListener(viewer);
 		}
 		return fContextMenuFiller;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getPreferenceStore()
 	 */
 	protected IPreferenceStore getPreferenceStore() {
 		return XMLUIPlugin.getDefault().getPreferenceStore();
 	}

 	public ILabelProvider getStatusLineLabelProvider(TreeViewer treeViewer) {
 		if (fSimpleLabelProvider == null) {
 			fSimpleLabelProvider = new StatusLineLabelProvider();
 		}
 		return fSimpleLabelProvider;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDragSourceListeners(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	public TransferDragSourceListener[] getTransferDragSourceListeners(final TreeViewer treeViewer) {
 		if (fTransferDragSourceListeners == null) {
 			fTransferDragSourceListeners = new TransferDragSourceListener[]{new TransferDragSourceListener() {

 				public void dragFinished(DragSourceEvent event) {
 					LocalSelectionTransfer.getTransfer().setSelection(null);
 				}

 				public void dragSetData(DragSourceEvent event) {
 				}

 				public void dragStart(DragSourceEvent event) {
 					LocalSelectionTransfer.getTransfer().setSelection(treeViewer.getSelection());
 				}

 				public Transfer getTransfer() {
 					return LocalSelectionTransfer.getTransfer();
 				}
 			}};
 		}

 		return fTransferDragSourceListeners;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDropTargetListeners(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	public TransferDropTargetListener[] getTransferDropTargetListeners(final TreeViewer treeViewer) {
 		if (fTransferDropTargetListeners == null) {
 			fTransferDropTargetListeners = new TransferDropTargetListener[]{new TransferDropTargetListener() {
 				public void dragEnter(DropTargetEvent event) {
 				}

 				public void dragLeave(DropTargetEvent event) {
 				}

 				public void dragOperationChanged(DropTargetEvent event) {
 				}

 				public void dragOver(DropTargetEvent event) {
 					event.feedback = DND.FEEDBACK_SELECT;
 					float feedbackFloat = getHeightInItem(event);
 					if (feedbackFloat > 0.75) {
 						event.feedback = DND.FEEDBACK_INSERT_AFTER;
 					}
 					else if (feedbackFloat < 0.25) {
 						event.feedback = DND.FEEDBACK_INSERT_BEFORE;
 					}
 					event.feedback |= DND.FEEDBACK_EXPAND | DND.FEEDBACK_SCROLL;
 				}

 				public void drop(DropTargetEvent event) {
 					if (event.operations != DND.DROP_NONE && LocalSelectionTransfer.getTransfer().getSelection() != null && !LocalSelectionTransfer.getTransfer().getSelection().isEmpty()) {
 						IStructuredSelection selection = (IStructuredSelection) LocalSelectionTransfer.getTransfer().getSelection();
 						if (selection != null && !selection.isEmpty() && event.item != null && event.item.getData() != null) {
 							/*
 							 * the command uses these numbers instead of the
 							 * feedback constants (even though it converts in
 							 * the other direction as well)
 							 */
 							float feedbackFloat = getHeightInItem(event);

 							final DragNodeCommand command = new DragNodeCommand(event.item.getData(), feedbackFloat, event.operations, event.detail, selection.toList(), treeViewer);
 							if (command != null && command.canExecute()) {
 								SafeRunnable.run(new SafeRunnable() {
 									public void run() throws Exception {
 										command.execute();
 									}
 								});
 							}
 						}
 					}
 				}

 				public void dropAccept(DropTargetEvent event) {
 				}

 				private float getHeightInItem(DropTargetEvent event) {
 					if (event.item == null)
 						return .5f;
 					if (event.item instanceof TreeItem) {
 						TreeItem treeItem = (TreeItem) event.item;
 						Control control = treeItem.getParent();
 						Point point = control.toControl(new Point(event.x, event.y));
 						Rectangle bounds = treeItem.getBounds();
 						return (float) (point.y - bounds.y) / (float) bounds.height;
 					}
 					else if (event.item instanceof TableItem) {
 						TableItem tableItem = (TableItem) event.item;
 						Control control = tableItem.getParent();
 						Point point = control.toControl(new Point(event.x, event.y));
 						Rectangle bounds = tableItem.getBounds(0);
 						return (float) (point.y - bounds.y) / (float) bounds.height;
 					}
 					else {
 						return 0.0F;
 					}
 				}

 				public Transfer getTransfer() {
 					return LocalSelectionTransfer.getTransfer();
 				}

 				public boolean isEnabled(DropTargetEvent event) {
 					return getTransfer().isSupportedType(event.currentDataType);
 				}
 			}};
 		}
 		return fTransferDropTargetListeners;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#unconfigure(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	public void unconfigure(TreeViewer viewer) {
 		super.unconfigure(viewer);
 		fTransferDragSourceListeners = null;
 		fTransferDropTargetListeners = null;
 		if (fContextMenuFiller != null) {
 			fContextMenuFiller.release();
 			fContextMenuFiller = null;
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2001, 2009 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	* Jens Lukowski/Innoopract - initial renaming/restructuring
	*
	*******************************************************************************/
	package org.eclipse.wst.xml.ui.views.contentoutline;

	import org.eclipse.core.runtime.IPath;
	import org.eclipse.jface.action.IMenuListener;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.preference.IPreferenceStore;
	import org.eclipse.jface.util.LocalSelectionTransfer;
	import org.eclipse.jface.util.SafeRunnable;
	import org.eclipse.jface.util.TransferDragSourceListener;
	import org.eclipse.jface.util.TransferDropTargetListener;
	import org.eclipse.jface.viewers.IContentProvider;
	import org.eclipse.jface.viewers.ILabelProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.TreeViewer;
	import org.eclipse.swt.dnd.DND;
	import org.eclipse.swt.dnd.DragSourceEvent;
	import org.eclipse.swt.dnd.DropTargetEvent;
	import org.eclipse.swt.dnd.Transfer;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.Rectangle;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.TableItem;
	import org.eclipse.swt.widgets.TreeItem;
	import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
	import org.eclipse.wst.sse.ui.internal.IReleasable;
	import org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration;
	import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;
	import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeContentProvider;
	import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeLabelProvider;
	import org.eclipse.wst.xml.ui.internal.contentoutline.XMLNodeActionManager;
	import org.eclipse.wst.xml.ui.internal.dnd.DragNodeCommand;
	import org.w3c.dom.Attr;
	import org.w3c.dom.Node;

	/**
	* Basic Outline Configuration for generic XML support. Expects that the viewer's
	* input will be the DOM Model, and provides basic label and content providers.
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration
	* @since 3.1
	*/
	public abstract class AbstractXMLContentOutlineConfiguration extends ContentOutlineConfiguration {
	private class ActionManagerMenuListener implements IMenuListener, IReleasable {
	private XMLNodeActionManager fActionManager;
	private TreeViewer fTreeViewer;

	public ActionManagerMenuListener(TreeViewer viewer) {
	fTreeViewer = viewer;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.action.IMenuListener#menuAboutToShow(org.eclipse.jface.action.IMenuManager)
	*/
	public void menuAboutToShow(IMenuManager manager) {
	if (fActionManager == null) {
	fActionManager = createNodeActionManager(fTreeViewer);
	}
	if (fActionManager != null) {
	fActionManager.fillContextMenu(manager, fTreeViewer.getSelection());
	}
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.internal.IReleasable#release()
	*/
	public void release() {
	fTreeViewer = null;
	if (fActionManager != null) {
	fActionManager.setModel(null);
	}
	}
	}

	private static class StatusLineLabelProvider extends JFaceNodeLabelProvider {
	public StatusLineLabelProvider() {
	super();
	}

	public String getText(Object element) {
	if (element == null)
	return null;

	if (!(element instanceof Node)) {
	return super.getText(element);
	}

	StringBuffer s = new StringBuffer();
	Node node = (Node) element;
	while (node != null) {
	if (node.getNodeType() != Node.DOCUMENT_NODE) {
	s.insert(0, super.getText(node));
	}

	if (node.getNodeType() == Node.ATTRIBUTE_NODE)
	node = ((Attr) node).getOwnerElement();
	else
	node = node.getParentNode();

	if (node != null && node.getNodeType() != Node.DOCUMENT_NODE) {
	s.insert(0, IPath.SEPARATOR);
	}
	}
	return s.toString();
	}
	}

	private IContentProvider fContentProvider = null;

	private ActionManagerMenuListener fContextMenuFiller = null;

	private ILabelProvider fLabelProvider = null;

	boolean fShowAttributes = false;

	private ILabelProvider fSimpleLabelProvider;
	private TransferDragSourceListener[] fTransferDragSourceListeners;

	private TransferDropTargetListener[] fTransferDropTargetListeners;

	/**
	* Create new instance of XMLContentOutlineConfiguration
	*/
	public AbstractXMLContentOutlineConfiguration() {
	// Must have empty constructor to createExecutableExtension
	super();
	}

	/**
	* Returns the NodeActionManager to use for the given treeViewer.
	* <p>
	* Not API. May be removed in the future.
	* </p>
	*
	* @param treeViewer
	* the TreeViewer associated with this configuration
	* @return a node action manager for use with this tree viewer
	*/
	protected XMLNodeActionManager createNodeActionManager(TreeViewer treeViewer) {
	return new XMLNodeActionManager((IStructuredModel) treeViewer.getInput(), treeViewer);
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getContentProvider(org.eclipse.jface.viewers.TreeViewer)
	*/
	public IContentProvider getContentProvider(TreeViewer viewer) {
	if (fContentProvider == null) {
	fContentProvider = new JFaceNodeContentProvider();
	}
	return fContentProvider;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getLabelProvider(org.eclipse.jface.viewers.TreeViewer)
	*/
	public ILabelProvider getLabelProvider(TreeViewer viewer) {
	if (fLabelProvider == null) {
	fLabelProvider = new JFaceNodeLabelProvider();
	}
	return fLabelProvider;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getMenuListener(org.eclipse.jface.viewers.TreeViewer)
	*/
	public IMenuListener getMenuListener(TreeViewer viewer) {
	if (fContextMenuFiller == null) {
	fContextMenuFiller = new ActionManagerMenuListener(viewer);
	}
	return fContextMenuFiller;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getPreferenceStore()
	*/
	protected IPreferenceStore getPreferenceStore() {
	return XMLUIPlugin.getDefault().getPreferenceStore();
	}

	public ILabelProvider getStatusLineLabelProvider(TreeViewer treeViewer) {
	if (fSimpleLabelProvider == null) {
	fSimpleLabelProvider = new StatusLineLabelProvider();
	}
	return fSimpleLabelProvider;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDragSourceListeners(org.eclipse.jface.viewers.TreeViewer)
	*/
	public TransferDragSourceListener[] getTransferDragSourceListeners(final TreeViewer treeViewer) {
	if (fTransferDragSourceListeners == null) {
	fTransferDragSourceListeners = new TransferDragSourceListener[]{new TransferDragSourceListener() {

	public void dragFinished(DragSourceEvent event) {
	LocalSelectionTransfer.getTransfer().setSelection(null);
	}

	public void dragSetData(DragSourceEvent event) {
	}

	public void dragStart(DragSourceEvent event) {
	LocalSelectionTransfer.getTransfer().setSelection(treeViewer.getSelection());
	}

	public Transfer getTransfer() {
	return LocalSelectionTransfer.getTransfer();
	}
	}};
	}

	return fTransferDragSourceListeners;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDropTargetListeners(org.eclipse.jface.viewers.TreeViewer)
	*/
	public TransferDropTargetListener[] getTransferDropTargetListeners(final TreeViewer treeViewer) {
	if (fTransferDropTargetListeners == null) {
	fTransferDropTargetListeners = new TransferDropTargetListener[]{new TransferDropTargetListener() {
	public void dragEnter(DropTargetEvent event) {
	}

	public void dragLeave(DropTargetEvent event) {
	}

	public void dragOperationChanged(DropTargetEvent event) {
	}

	public void dragOver(DropTargetEvent event) {
	event.feedback = DND.FEEDBACK_SELECT;
	float feedbackFloat = getHeightInItem(event);
	if (feedbackFloat > 0.75) {
	event.feedback = DND.FEEDBACK_INSERT_AFTER;
	}
	else if (feedbackFloat < 0.25) {
	event.feedback = DND.FEEDBACK_INSERT_BEFORE;
	}
	event.feedback \|= DND.FEEDBACK_EXPAND \| DND.FEEDBACK_SCROLL;
	}

	public void drop(DropTargetEvent event) {
	if (event.operations != DND.DROP_NONE && LocalSelectionTransfer.getTransfer().getSelection() != null && !LocalSelectionTransfer.getTransfer().getSelection().isEmpty()) {
	IStructuredSelection selection = (IStructuredSelection) LocalSelectionTransfer.getTransfer().getSelection();
	if (selection != null && !selection.isEmpty() && event.item != null && event.item.getData() != null) {
	/*
	* the command uses these numbers instead of the
	* feedback constants (even though it converts in
	* the other direction as well)
	*/
	float feedbackFloat = getHeightInItem(event);

	final DragNodeCommand command = new DragNodeCommand(event.item.getData(), feedbackFloat, event.operations, event.detail, selection.toList(), treeViewer);
	if (command != null && command.canExecute()) {
	SafeRunnable.run(new SafeRunnable() {
	public void run() throws Exception {
	command.execute();
	}
	});
	}
	}
	}
	}

	public void dropAccept(DropTargetEvent event) {
	}

	private float getHeightInItem(DropTargetEvent event) {
	if (event.item == null)
	return .5f;
	if (event.item instanceof TreeItem) {
	TreeItem treeItem = (TreeItem) event.item;
	Control control = treeItem.getParent();
	Point point = control.toControl(new Point(event.x, event.y));
	Rectangle bounds = treeItem.getBounds();
	return (float) (point.y - bounds.y) / (float) bounds.height;
	}
	else if (event.item instanceof TableItem) {
	TableItem tableItem = (TableItem) event.item;
	Control control = tableItem.getParent();
	Point point = control.toControl(new Point(event.x, event.y));
	Rectangle bounds = tableItem.getBounds(0);
	return (float) (point.y - bounds.y) / (float) bounds.height;
	}
	else {
	return 0.0F;
	}
	}

	public Transfer getTransfer() {
	return LocalSelectionTransfer.getTransfer();
	}

	public boolean isEnabled(DropTargetEvent event) {
	return getTransfer().isSupportedType(event.currentDataType);
	}
	}};
	}
	return fTransferDropTargetListeners;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#unconfigure(org.eclipse.jface.viewers.TreeViewer)
	*/
	public void unconfigure(TreeViewer viewer) {
	super.unconfigure(viewer);
	fTransferDragSourceListeners = null;
	fTransferDropTargetListeners = null;
	if (fContextMenuFiller != null) {
	fContextMenuFiller.release();
	fContextMenuFiller = null;
	}
	}
	}