/*******************************************************************************
* Copyright (c) 2005, 2006 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.selection;
import org.eclipse.jface.action.IAction;
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.swt.widgets.Event;
import org.eclipse.ui.IActionDelegate2;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IViewActionDelegate;
import org.eclipse.ui.IViewPart;
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;
abstract public class StructuredSelectActionDelegate implements IEditorActionDelegate, IActionDelegate2, IViewActionDelegate {
private IEditorPart fEditor;
private SelectionHistory fHistory;
public void dispose() {
fEditor = null;
fHistory = null;
}
public void init(IViewPart view) {
// do nothing
}
public void runWithEvent(IAction action, Event event) {
run(action);
}
public void run(IAction action) {
if (fEditor instanceof ITextEditor) {
ITextEditor textEditor = (ITextEditor) fEditor;
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) {
fHistory.remember(new Region(textSelection.getOffset(), textSelection.getLength()));
try {
fHistory.ignoreSelectionChanges();
textEditor.selectAndReveal(newSelectionRegion.getOffset(), newSelectionRegion.getLength());
}
finally {
fHistory.listenToSelectionChanges();
}
}
}
}
}
}
public void selectionChanged(IAction action, ISelection selection) {
// do nothing
}
public void setActiveEditor(IAction action, IEditorPart targetEditor) {
fEditor = targetEditor;
if (fEditor != null)
fHistory = (SelectionHistory) fEditor.getAdapter(SelectionHistory.class);
else
fHistory = null;
}
abstract protected IndexedRegion getCursorIndexedRegion(IDocument document, ITextSelection textSelection);
abstract protected Region getNewSelectionRegion(IndexedRegion indexedRegion, ITextSelection textSelection);
/**
* 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;
}
}