/*******************************************************************************
* Copyright (c) 2008 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.wst.sse.ui.internal.handlers;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.provisional.IndexedRegion;
import org.eclipse.wst.sse.ui.internal.selection.SelectionHistory;
abstract public class AbstractStructuredSelectHandler extends AbstractHandler {
public Object execute(ExecutionEvent event) throws ExecutionException {
IEditorPart editor = HandlerUtil.getActiveEditor(event);
ITextEditor textEditor = null;
if (editor instanceof ITextEditor)
textEditor = (ITextEditor) editor;
else {
Object o = editor.getAdapter(ITextEditor.class);
if (o != null)
textEditor = (ITextEditor) o;
}
if (textEditor != null) {
ISelection selection = textEditor.getSelectionProvider().getSelection();
IDocument document = textEditor.getDocumentProvider().getDocument(textEditor.getEditorInput());
// determine current text selection
if (selection instanceof ITextSelection && document != null) {
ITextSelection textSelection = (ITextSelection) selection;
if (textSelection.getLength() < document.getLength()) {
// get current indexed region
IndexedRegion cursorIndexedRegion = getCursorIndexedRegion(document, textSelection);
// determine new selection based on current indexed region
Region newSelectionRegion = getNewSelectionRegion(cursorIndexedRegion, textSelection);
// select new selection
if (newSelectionRegion != null) {
SelectionHistory history = (SelectionHistory) editor.getAdapter(SelectionHistory.class);
if (history != null) {
history.remember(new Region(textSelection.getOffset(), textSelection.getLength()));
try {
history.ignoreSelectionChanges();
textEditor.selectAndReveal(newSelectionRegion.getOffset(), newSelectionRegion.getLength());
}
finally {
history.listenToSelectionChanges();
}
}
}
}
}
}
return null;
}
/**
* This method will probably be removed and replaced by using new
* selection provider
*
* @param document
* @param offset
* @return
*/
protected IndexedRegion getIndexedRegion(IDocument document, int offset) {
IndexedRegion indexedRegion = null;
int lastOffset = offset;
IStructuredModel model = StructuredModelManager.getModelManager().getExistingModelForRead(document);
if (model != null) {
try {
indexedRegion = model.getIndexedRegion(lastOffset);
while (indexedRegion == null && lastOffset >= 0) {
lastOffset--;
indexedRegion = model.getIndexedRegion(lastOffset);
}
}
finally {
model.releaseFromRead();
}
}
return indexedRegion;
}
abstract protected IndexedRegion getCursorIndexedRegion(IDocument document, ITextSelection textSelection);
abstract protected Region getNewSelectionRegion(IndexedRegion indexedRegion, ITextSelection textSelection);
}