| /******************************************************************************* |
| * Copyright (c) 2000, 2010 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 |
| *******************************************************************************/ |
| package org.eclipse.gef.editparts; |
| |
| import org.eclipse.swt.widgets.Tree; |
| import org.eclipse.swt.widgets.Widget; |
| |
| import org.eclipse.gef.DragTracker; |
| import org.eclipse.gef.EditPart; |
| import org.eclipse.gef.EditPartViewer; |
| import org.eclipse.gef.Request; |
| import org.eclipse.gef.RootEditPart; |
| import org.eclipse.gef.TreeEditPart; |
| import org.eclipse.gef.commands.Command; |
| import org.eclipse.gef.commands.UnexecutableCommand; |
| |
| /** |
| * The root editpart for a <code>TreeViewer</code>. There is limited control of |
| * a Tree, so this root implementation should work for all purposes. This |
| * implementation does little more than hold onto the viewer, and pass the |
| * <code>Tree</code> to the contents as its widget. |
| * |
| * @author hudsonr |
| */ |
| public class RootTreeEditPart extends |
| org.eclipse.gef.editparts.AbstractEditPart implements RootEditPart, |
| TreeEditPart { |
| |
| private EditPartViewer viewer; |
| private Widget widget; |
| private TreeEditPart contents; |
| |
| /** |
| * This is where the child gets added. No TreeItem is needed here because |
| * the contents is actually represented by the Tree iteself. |
| * |
| * @param childEditPart |
| * EditPart of child to be added. |
| * @param index |
| * Position where it is to be added. |
| */ |
| protected void addChildVisual(EditPart childEditPart, int index) { |
| ((TreeEditPart) childEditPart).setWidget(widget); |
| } |
| |
| /** |
| * @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies() |
| */ |
| protected void createEditPolicies() { |
| } |
| |
| /** |
| * @see org.eclipse.gef.EditPart#getCommand(org.eclipse.gef.Request) |
| */ |
| public Command getCommand(Request request) { |
| return UnexecutableCommand.INSTANCE; |
| } |
| |
| /** |
| * @see org.eclipse.gef.RootEditPart#getContents() |
| */ |
| public EditPart getContents() { |
| return contents; |
| } |
| |
| /** |
| * This method will never be called on a tree root. |
| * |
| * @see org.eclipse.gef.EditPart#getDragTracker(org.eclipse.gef.Request) |
| */ |
| public DragTracker getDragTracker(Request request) { |
| return null; |
| } |
| |
| /** |
| * Returns <code>this</code>. |
| * |
| * @see org.eclipse.gef.EditPart#getRoot() |
| */ |
| public RootEditPart getRoot() { |
| return this; |
| } |
| |
| /** |
| * @see org.eclipse.gef.RootEditPart#getViewer() |
| */ |
| public EditPartViewer getViewer() { |
| return viewer; |
| } |
| |
| /** |
| * The editpart holds onto the SWT Tree, which is also the contents' widget. |
| * |
| * @see org.eclipse.gef.TreeEditPart#getWidget() |
| */ |
| public Widget getWidget() { |
| return widget; |
| } |
| |
| /** |
| * Overridden to do nothing since the child is explicitly set. |
| * |
| * @see org.eclipse.gef.editparts.AbstractEditPart#refreshChildren() |
| */ |
| protected void refreshChildren() { |
| } |
| |
| /** |
| * This is where the child gets removed. This method is overridden here so |
| * that the AbstractTreeEditPart does not dispose the widget, which is the |
| * Tree in this case. The tree is owned by the viewer, not the child. |
| * |
| * @param childEditPart |
| * EditPart of child to be removed. |
| */ |
| protected void removeChildVisual(EditPart childEditPart) { |
| ((TreeEditPart) childEditPart).setWidget(null); |
| } |
| |
| /** |
| * @see org.eclipse.gef.RootEditPart#setContents(org.eclipse.gef.EditPart) |
| */ |
| public void setContents(EditPart editpart) { |
| if (contents != null) { |
| if (getWidget() != null) |
| ((Tree) getWidget()).removeAll(); |
| removeChild(contents); |
| } |
| contents = (TreeEditPart) editpart; |
| |
| if (contents != null) |
| addChild(contents, -1); |
| } |
| |
| /** |
| * @see org.eclipse.gef.RootEditPart#setViewer(org.eclipse.gef.EditPartViewer) |
| */ |
| public void setViewer(EditPartViewer epviewer) { |
| viewer = epviewer; |
| } |
| |
| /** |
| * Called by <code>TreeViewer</code> to set the <code>Tree</code> into the |
| * root. The root simply holds onto this widget and passes it to the |
| * contents when the contents is added. |
| * |
| * @see org.eclipse.gef.TreeEditPart#setWidget(org.eclipse.swt.widgets.Widget) |
| */ |
| public void setWidget(Widget w) { |
| widget = w; |
| if (contents != null) |
| contents.setWidget(w); |
| } |
| |
| } |