/*******************************************************************************
 * Copyright (c) 2004, 2005 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.examples.text.model.commands;

import org.eclipse.gef.examples.text.GraphicalTextViewer;
import org.eclipse.gef.examples.text.SelectionRange;
import org.eclipse.gef.examples.text.edit.TextEditPart;
import org.eclipse.gef.examples.text.model.Container;
import org.eclipse.gef.examples.text.model.TextRun;

/**
 * Re-parents an element to its grandparent.  Removes the parent if it becomes empty
 * @since 3.1
 */
public class PromoteElementCommand extends ExampleTextCommand {

private TextRun run;
private Container oldParent;
int index;
private int caretOffset;

public PromoteElementCommand(TextEditPart part, int caretOffset) {
	super("decrease indentation");
	this.caretOffset = caretOffset;
	run = (TextRun)part.getModel();
	oldParent = run.getContainer();
}

public void execute() {
	index = oldParent.getChildren().indexOf(run);
	Container newParent = oldParent.getContainer();
	int where = newParent.getChildren().indexOf(oldParent) + 1;
	oldParent.remove(run);
	run.setType(newParent.getChildType());
	newParent.add(run, where);
	if (oldParent.getChildren().isEmpty())
		oldParent.getContainer().remove(oldParent);
}

public boolean canExecute() {
	//Is there a container into which the run can be promoted.
	return oldParent.getContainer() != null;
}

public SelectionRange getExecuteSelectionRange(GraphicalTextViewer viewer) {
	return new SelectionRange(lookupModel(viewer, run), caretOffset);
}

public SelectionRange getRedoSelectionRange(GraphicalTextViewer viewer) {
	return getExecuteSelectionRange(viewer);
}

public SelectionRange getUndoSelectionRange(GraphicalTextViewer viewer) {
	return getExecuteSelectionRange(viewer);
}

}