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

 /*******************************************************************************
  * Copyright (c) 2001, 2007 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.jface.action.IContributionItem;
 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.ISelection;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.StructuredSelection;
 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.core.utils.StringUtils;
 import org.eclipse.wst.sse.ui.internal.IReleasable;
 import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateAction;
 import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateActionContributionItem;
 import org.eclipse.wst.sse.ui.internal.editor.EditorPluginImageHelper;
 import org.eclipse.wst.sse.ui.internal.editor.EditorPluginImages;
 import org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration;
 import org.eclipse.wst.xml.core.internal.contentmodel.CMAttributeDeclaration;
 import org.eclipse.wst.xml.core.internal.contentmodel.CMDataType;
 import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
 import org.eclipse.wst.xml.core.internal.contentmodel.modelquery.ModelQuery;
 import org.eclipse.wst.xml.core.internal.modelquery.ModelQueryUtil;
 import org.eclipse.wst.xml.ui.internal.XMLUIMessages;
 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.Element;
 import org.w3c.dom.NamedNodeMap;
 import org.w3c.dom.Node;

 /**
  * Outline Configuration for generic XML support, expects that the viewer's
  * input will be the DOM Model.
  *
  * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration
  * @since 1.0
  */
 public class XMLContentOutlineConfiguration 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);
 			}
 			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 class AttributeShowingLabelProvider extends JFaceNodeLabelProvider {
 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see org.eclipse.jface.viewers.ILabelProvider#getText(java.lang.Object)
 		 */
 		public String getText(Object o) {
 			StringBuffer text = new StringBuffer(super.getText(o));
 			if (o instanceof Node) {
 				Node node = (Node) o;
 				if (node.getNodeType() == Node.ELEMENT_NODE && fShowAttributes) {
 					// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
 					if (node.hasAttributes()) {
 						Element element = (Element) node;
 						NamedNodeMap attributes = element.getAttributes();
 						Node idTypedAttribute = null;
 						Node requiredAttribute = null;
 						boolean hasId = false;
 						boolean hasName = false;
 						Node shownAttribute = null;

 						// try to get content model element
 						// declaration
 						CMElementDeclaration elementDecl = null;
 						ModelQuery mq = ModelQueryUtil.getModelQuery(element.getOwnerDocument());
 						if (mq != null) {
 							elementDecl = mq.getCMElementDeclaration(element);
 						}
 						// find an attribute of type (or just named)
 						// ID
 						if (elementDecl != null) {
 							int i = 0;
 							while (i < attributes.getLength() && idTypedAttribute == null) {
 								Node attr = attributes.item(i);
 								String attrName = attr.getNodeName();
 								CMAttributeDeclaration attrDecl = (CMAttributeDeclaration) elementDecl.getAttributes().getNamedItem(attrName);
 								if (attrDecl != null) {
 									if ((attrDecl.getAttrType() != null) && (CMDataType.ID.equals(attrDecl.getAttrType().getDataTypeName()))) {
 										idTypedAttribute = attr;
 									}
 									else if (attrDecl.getUsage() == CMAttributeDeclaration.REQUIRED && requiredAttribute == null) {
 										// as a backup, keep tabs on
 										// any required
 										// attributes
 										requiredAttribute = attr;
 									}
 									else {
 										hasId = hasId || attrName.equals("id"); //$NON-NLS-1$
 										hasName = hasName || attrName.equals("name"); //$NON-NLS-1$
 									}
 								}
 								++i;
 							}
 						}

 						/*
 						 * If no suitable attribute was found, try using a
 						 * required attribute, if none, then prefer "id" or
 						 * "name", otherwise just use first attribute
 						 */
 						if (idTypedAttribute != null) {
 							shownAttribute = idTypedAttribute;
 						}
 						else if (requiredAttribute != null) {
 							shownAttribute = requiredAttribute;
 						}
 						else if (hasId) {
 							shownAttribute = attributes.getNamedItem("id"); //$NON-NLS-1$
 						}
 						else if (hasName) {
 							shownAttribute = attributes.getNamedItem("name"); //$NON-NLS-1$
 						}
 						if (shownAttribute == null) {
 							shownAttribute = attributes.item(0);
 						}

 						// display the attribute and value (without quotes)
 						String attributeName = shownAttribute.getNodeName();
 						if (attributeName != null && attributeName.length() > 0) {
 							text.append(" " + attributeName); //$NON-NLS-1$
 							String attributeValue = shownAttribute.getNodeValue();
 							if (attributeValue != null && attributeValue.length() > 0) {
 								text.append("=" + StringUtils.strip(attributeValue)); //$NON-NLS-1$
 							}
 						}
 					}
 				}
 			}
 			return text.toString();
 		}
 	}

 	/**
 	 * Toggle action for whether or not to display element's first attribute
 	 */
 	private class ToggleShowAttributeAction extends PropertyChangeUpdateAction {
 		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
 		private TreeViewer fTreeViewer;

 		public ToggleShowAttributeAction(IPreferenceStore store, String preference, TreeViewer treeViewer) {
 			super(XMLUIMessages.XMLContentOutlineConfiguration_0, store, preference, true);
 			setToolTipText(getText());
 			// images needed
 			// setDisabledImageDescriptor(SYNCED_D);
 			// (nsd) temporarily re-use Properties view image
 			setImageDescriptor(EditorPluginImageHelper.getInstance().getImageDescriptor(EditorPluginImages.IMG_OBJ_PROP_PS));
 			fTreeViewer = treeViewer;
 			update();
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see org.eclipse.ui.texteditor.IUpdate#update()
 		 */
 		public void update() {
 			super.update();
 			fShowAttributes = isChecked();

 			// notify the configuration of the change
 			enableShowAttributes(fShowAttributes, fTreeViewer);

 			// refresh the outline view
 			fTreeViewer.refresh(true);
 		}
 	}

 	private IContentProvider fContentProvider = null;

 	private ActionManagerMenuListener fContextMenuFiller = null;

 	private ILabelProvider fLabelProvider = null;

 	boolean fShowAttributes = false;

 	private TransferDragSourceListener[] fTransferDragSourceListeners;
 	private TransferDropTargetListener[] fTransferDropTargetListeners;

 	/*
 	 * Preference key for Show Attributes
 	 */
 	private final String OUTLINE_SHOW_ATTRIBUTE_PREF = "outline-show-attribute-editor"; //$NON-NLS-1$

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

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#createMenuContributions(org.eclipse.jface.viewers.TreeViewer)
 	 */
 	protected IContributionItem[] createMenuContributions(TreeViewer viewer) {
 		IContributionItem[] items;
 		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
 		IContributionItem showAttributeItem = new PropertyChangeUpdateActionContributionItem(new ToggleShowAttributeAction(getPreferenceStore(), OUTLINE_SHOW_ATTRIBUTE_PREF, viewer));
 		items = super.createMenuContributions(viewer);
 		if (items == null) {
 			items = new IContributionItem[]{showAttributeItem};
 		}
 		else {
 			IContributionItem[] combinedItems = new IContributionItem[items.length + 1];
 			System.arraycopy(items, 0, combinedItems, 0, items.length);
 			combinedItems[items.length] = showAttributeItem;
 			items = combinedItems;
 		}
 		return items;
 	}

 	/**
 	 * 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);
 	}

 	/**
 	 * Notifies this configuration that the flag that indicates whether or not
 	 * to show attribute values in the tree viewer has changed. The tree
 	 * viewer is automatically refreshed afterwards to update the labels.
 	 *
 	 * Clients should not call this method, but rather should react to it.
 	 *
 	 * @param showAttributes
 	 *            flag indicating whether or not to show attribute values in
 	 *            the tree viewer
 	 * @param treeViewer
 	 *            the TreeViewer associated with this configuration
 	 */
 	protected void enableShowAttributes(boolean showAttributes, TreeViewer treeViewer) {
 		// nothing by default
 	}

 	/*
 	 * (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;
 	}

 	private Object getFilteredNode(Object object) {
 		if (object instanceof Node) {
 			Node node = (Node) object;

 			// replace attribute node in selection with its parent
 			if (node.getNodeType() == Node.ATTRIBUTE_NODE)
 				node = ((Attr) node).getOwnerElement();
 			// replace TextNode in selection with its parent
 			else if (node.getNodeType() == Node.TEXT_NODE)
 				node = node.getParentNode();
 			return node;
 		}
 		return object;
 	}

 	private Object[] getFilteredNodes(Object[] filteredNodes) {
 		for (int i = 0; i < filteredNodes.length; i++) {
 			filteredNodes[i] = getFilteredNode(filteredNodes[i]);
 		}
 		return filteredNodes;
 	}

 	/*
 	 * (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 AttributeShowingLabelProvider();
 		}
 		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();
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getSelection(org.eclipse.jface.viewers.TreeViewer,
 	 *      org.eclipse.jface.viewers.ISelection)
 	 */
 	public ISelection getSelection(TreeViewer viewer, ISelection selection) {
 		ISelection filteredSelection = selection;
 		if (selection instanceof IStructuredSelection) {
 			Object[] filteredNodes = getFilteredNodes(((IStructuredSelection) selection).toArray());
 			filteredSelection = new StructuredSelection(filteredNodes);
 		}
 		return filteredSelection;
 	}

 	/*
 	 * (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, 2007 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.jface.action.IContributionItem;
	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.ISelection;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.StructuredSelection;
	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.core.utils.StringUtils;
	import org.eclipse.wst.sse.ui.internal.IReleasable;
	import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateAction;
	import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateActionContributionItem;
	import org.eclipse.wst.sse.ui.internal.editor.EditorPluginImageHelper;
	import org.eclipse.wst.sse.ui.internal.editor.EditorPluginImages;
	import org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration;
	import org.eclipse.wst.xml.core.internal.contentmodel.CMAttributeDeclaration;
	import org.eclipse.wst.xml.core.internal.contentmodel.CMDataType;
	import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
	import org.eclipse.wst.xml.core.internal.contentmodel.modelquery.ModelQuery;
	import org.eclipse.wst.xml.core.internal.modelquery.ModelQueryUtil;
	import org.eclipse.wst.xml.ui.internal.XMLUIMessages;
	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.Element;
	import org.w3c.dom.NamedNodeMap;
	import org.w3c.dom.Node;

	/**
	* Outline Configuration for generic XML support, expects that the viewer's
	* input will be the DOM Model.
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration
	* @since 1.0
	*/
	public class XMLContentOutlineConfiguration 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);
	}
	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 class AttributeShowingLabelProvider extends JFaceNodeLabelProvider {
	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.viewers.ILabelProvider#getText(java.lang.Object)
	*/
	public String getText(Object o) {
	StringBuffer text = new StringBuffer(super.getText(o));
	if (o instanceof Node) {
	Node node = (Node) o;
	if (node.getNodeType() == Node.ELEMENT_NODE && fShowAttributes) {
	// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
	if (node.hasAttributes()) {
	Element element = (Element) node;
	NamedNodeMap attributes = element.getAttributes();
	Node idTypedAttribute = null;
	Node requiredAttribute = null;
	boolean hasId = false;
	boolean hasName = false;
	Node shownAttribute = null;

	// try to get content model element
	// declaration
	CMElementDeclaration elementDecl = null;
	ModelQuery mq = ModelQueryUtil.getModelQuery(element.getOwnerDocument());
	if (mq != null) {
	elementDecl = mq.getCMElementDeclaration(element);
	}
	// find an attribute of type (or just named)
	// ID
	if (elementDecl != null) {
	int i = 0;
	while (i < attributes.getLength() && idTypedAttribute == null) {
	Node attr = attributes.item(i);
	String attrName = attr.getNodeName();
	CMAttributeDeclaration attrDecl = (CMAttributeDeclaration) elementDecl.getAttributes().getNamedItem(attrName);
	if (attrDecl != null) {
	if ((attrDecl.getAttrType() != null) && (CMDataType.ID.equals(attrDecl.getAttrType().getDataTypeName()))) {
	idTypedAttribute = attr;
	}
	else if (attrDecl.getUsage() == CMAttributeDeclaration.REQUIRED && requiredAttribute == null) {
	// as a backup, keep tabs on
	// any required
	// attributes
	requiredAttribute = attr;
	}
	else {
	hasId = hasId \|\| attrName.equals("id"); //$NON-NLS-1$
	hasName = hasName \|\| attrName.equals("name"); //$NON-NLS-1$
	}
	}
	++i;
	}
	}

	/*
	* If no suitable attribute was found, try using a
	* required attribute, if none, then prefer "id" or
	* "name", otherwise just use first attribute
	*/
	if (idTypedAttribute != null) {
	shownAttribute = idTypedAttribute;
	}
	else if (requiredAttribute != null) {
	shownAttribute = requiredAttribute;
	}
	else if (hasId) {
	shownAttribute = attributes.getNamedItem("id"); //$NON-NLS-1$
	}
	else if (hasName) {
	shownAttribute = attributes.getNamedItem("name"); //$NON-NLS-1$
	}
	if (shownAttribute == null) {
	shownAttribute = attributes.item(0);
	}

	// display the attribute and value (without quotes)
	String attributeName = shownAttribute.getNodeName();
	if (attributeName != null && attributeName.length() > 0) {
	text.append(" " + attributeName); //$NON-NLS-1$
	String attributeValue = shownAttribute.getNodeValue();
	if (attributeValue != null && attributeValue.length() > 0) {
	text.append("=" + StringUtils.strip(attributeValue)); //$NON-NLS-1$
	}
	}
	}
	}
	}
	return text.toString();
	}
	}

	/**
	* Toggle action for whether or not to display element's first attribute
	*/
	private class ToggleShowAttributeAction extends PropertyChangeUpdateAction {
	// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
	private TreeViewer fTreeViewer;

	public ToggleShowAttributeAction(IPreferenceStore store, String preference, TreeViewer treeViewer) {
	super(XMLUIMessages.XMLContentOutlineConfiguration_0, store, preference, true);
	setToolTipText(getText());
	// images needed
	// setDisabledImageDescriptor(SYNCED_D);
	// (nsd) temporarily re-use Properties view image
	setImageDescriptor(EditorPluginImageHelper.getInstance().getImageDescriptor(EditorPluginImages.IMG_OBJ_PROP_PS));
	fTreeViewer = treeViewer;
	update();
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.ui.texteditor.IUpdate#update()
	*/
	public void update() {
	super.update();
	fShowAttributes = isChecked();

	// notify the configuration of the change
	enableShowAttributes(fShowAttributes, fTreeViewer);

	// refresh the outline view
	fTreeViewer.refresh(true);
	}
	}

	private IContentProvider fContentProvider = null;

	private ActionManagerMenuListener fContextMenuFiller = null;

	private ILabelProvider fLabelProvider = null;

	boolean fShowAttributes = false;

	private TransferDragSourceListener[] fTransferDragSourceListeners;
	private TransferDropTargetListener[] fTransferDropTargetListeners;

	/*
	* Preference key for Show Attributes
	*/
	private final String OUTLINE_SHOW_ATTRIBUTE_PREF = "outline-show-attribute-editor"; //$NON-NLS-1$

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

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#createMenuContributions(org.eclipse.jface.viewers.TreeViewer)
	*/
	protected IContributionItem[] createMenuContributions(TreeViewer viewer) {
	IContributionItem[] items;
	// https://bugs.eclipse.org/bugs/show_bug.cgi?id=88444
	IContributionItem showAttributeItem = new PropertyChangeUpdateActionContributionItem(new ToggleShowAttributeAction(getPreferenceStore(), OUTLINE_SHOW_ATTRIBUTE_PREF, viewer));
	items = super.createMenuContributions(viewer);
	if (items == null) {
	items = new IContributionItem[]{showAttributeItem};
	}
	else {
	IContributionItem[] combinedItems = new IContributionItem[items.length + 1];
	System.arraycopy(items, 0, combinedItems, 0, items.length);
	combinedItems[items.length] = showAttributeItem;
	items = combinedItems;
	}
	return items;
	}

	/**
	* 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);
	}

	/**
	* Notifies this configuration that the flag that indicates whether or not
	* to show attribute values in the tree viewer has changed. The tree
	* viewer is automatically refreshed afterwards to update the labels.
	*
	* Clients should not call this method, but rather should react to it.
	*
	* @param showAttributes
	* flag indicating whether or not to show attribute values in
	* the tree viewer
	* @param treeViewer
	* the TreeViewer associated with this configuration
	*/
	protected void enableShowAttributes(boolean showAttributes, TreeViewer treeViewer) {
	// nothing by default
	}

	/*
	* (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;
	}

	private Object getFilteredNode(Object object) {
	if (object instanceof Node) {
	Node node = (Node) object;

	// replace attribute node in selection with its parent
	if (node.getNodeType() == Node.ATTRIBUTE_NODE)
	node = ((Attr) node).getOwnerElement();
	// replace TextNode in selection with its parent
	else if (node.getNodeType() == Node.TEXT_NODE)
	node = node.getParentNode();
	return node;
	}
	return object;
	}

	private Object[] getFilteredNodes(Object[] filteredNodes) {
	for (int i = 0; i < filteredNodes.length; i++) {
	filteredNodes[i] = getFilteredNode(filteredNodes[i]);
	}
	return filteredNodes;
	}

	/*
	* (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 AttributeShowingLabelProvider();
	}
	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();
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getSelection(org.eclipse.jface.viewers.TreeViewer,
	* org.eclipse.jface.viewers.ISelection)
	*/
	public ISelection getSelection(TreeViewer viewer, ISelection selection) {
	ISelection filteredSelection = selection;
	if (selection instanceof IStructuredSelection) {
	Object[] filteredNodes = getFilteredNodes(((IStructuredSelection) selection).toArray());
	filteredSelection = new StructuredSelection(filteredNodes);
	}
	return filteredSelection;
	}

	/*
	* (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;
	}
	}
	}