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/*******************************************************************************
* Copyright (c) 2014 TwelveTone LLC 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:
* Steven Spungin <steven@spungin.tv> - initial API and implementation, Bug 396902, Bug 431847
******************************************************************************/
package org.eclipse.e4.tools.emf.ui.internal.common;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.e4.tools.emf.ui.common.IModelResource;
import org.eclipse.e4.tools.emf.ui.internal.common.xml.EMFDocumentResourceMediator;
import org.eclipse.e4.ui.internal.workbench.E4XMIResource;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.databinding.viewers.ObservableListTreeContentProvider;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocumentListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Composite;
/**
* Adds additional functionality to TreeViewer
*
* @author Steven Spungin
*
*/
public class TreeViewerEx extends TreeViewer {
private ArrayList<String> elementsIds;
private ArrayList<String> selectedIds;
public TreeViewerEx(Composite parent, int style, EMFDocumentResourceMediator emfDocumentProvider, final IModelResource modelProvider) {
super(parent, style);
emfDocumentProvider.getDocument().addDocumentListener(new IDocumentListener() {
@Override
public void documentChanged(DocumentEvent event) {
try {
// restore Nodes from XmiIds
E4XMIResource xmiResource = (E4XMIResource) ((EObject) modelProvider.getRoot().get(0)).eResource();
ArrayList<Object> newElements = new ArrayList<Object>();
ObservableListTreeContentProvider provider = (ObservableListTreeContentProvider) getContentProvider();
Object[] children = new Object[] { modelProvider.getRoot().get(0) };
for (String id : elementsIds) {
EObject eObject = xmiResource.getEObject(id);
if (eObject != null) {
newElements.add(eObject);
// force tree node creation
getFirstMatchingItem(eObject, provider, children);
}
}
ArrayList<Object> newSelected = new ArrayList<Object>();
for (String id : selectedIds) {
EObject eObject = xmiResource.getEObject(id);
if (eObject != null) {
newSelected.add(eObject);
// force tree node creation
getFirstMatchingItem(eObject, provider, children);
}
}
setExpandedElements(newElements.toArray(new Object[0]));
setSelection(new StructuredSelection(newSelected));
// update our stored id values
reloadIds(modelProvider);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void documentAboutToBeChanged(DocumentEvent event) {
reloadIds(modelProvider);
}
private void reloadIds(final IModelResource modelProvider) {
try {
// Stash XmiIds
Object[] elements = getExpandedElements();
List<?> selected = ((IStructuredSelection) getSelection()).toList();
E4XMIResource xmiResource = (E4XMIResource) ((EObject) modelProvider.getRoot().get(0)).eResource();
elementsIds = new ArrayList<String>();
selectedIds = new ArrayList<String>();
for (Object obj : elements) {
if (obj instanceof EObject) {
elementsIds.add(xmiResource.getID((EObject) obj));
}
}
for (Object obj : selected) {
if (obj instanceof EObject) {
selectedIds.add(xmiResource.getID((EObject) obj));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
// This will ensure the provider has created the tree node (so we can reveal
// it).
static public Object getFirstMatchingItem(EObject target, ObservableListTreeContentProvider provider, Object[] items) {
for (int i = 0; i < items.length; i++) {
if (items[i] == target) {
return items[i];
}
Object found = getFirstMatchingItem(target, provider, provider.getChildren(items[i]));
if (found != null) {
return found;
}
}
return null;
}
}
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