/*******************************************************************************
 * Copyright (c) 2008 Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.jboss.tools.smooks.gef.tree.figures;

import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.Label;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.tools.CellEditorLocator;
import org.eclipse.gef.tools.DirectEditManager;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.events.VerifyListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Text;
import org.jboss.tools.smooks.gef.tree.model.TreeNodeModel;
import org.jboss.tools.smooks.model.medi.MappingNode;

/**
 * @author Dart
 * 
 */
public class TreeNodeTextDirectManager extends DirectEditManager {
	Font scaledFont;
	protected VerifyListener verifyListener;
	protected Label textLabel;

	/**
	 * Creates a new ActivityDirectEditManager with the given attributes.
	 * 
	 * @param source
	 *            the source EditPart
	 * @param editorType
	 *            type of editor
	 * @param locator
	 *            the CellEditorLocator
	 */
	public TreeNodeTextDirectManager(GraphicalEditPart source, Class<?> editorType, CellEditorLocator locator, Label label) {
		super(source, editorType, locator);
		textLabel = label;
	}

	/**
	 * @see org.eclipse.gef.tools.DirectEditManager#bringDown()
	 */
	protected void bringDown() {
		// This method might be re-entered when super.bringDown() is called.
		Font disposeFont = scaledFont;
		scaledFont = null;
		super.bringDown();
		if (disposeFont != null)
			disposeFont.dispose();
	}

	/**
	 * @see org.eclipse.gef.tools.DirectEditManager#initCellEditor()
	 */
	protected void initCellEditor() {
		Text text = (Text) getCellEditor().getControl();
		verifyListener = new VerifyListener() {
			public void verifyText(VerifyEvent event) {
				Text text = (Text) getCellEditor().getControl();
				String oldText = text.getText();
				String leftText = oldText.substring(0, event.start);
				String rightText = oldText.substring(event.end, oldText.length());
				GC gc = new GC(text);
				Point size = gc.textExtent(leftText + event.text + rightText);
				gc.dispose();
				if (size.x != 0)
					size = text.computeSize(size.x, SWT.DEFAULT);
				getCellEditor().getControl().setSize(size.x, size.y);
			}
		};
		text.addVerifyListener(verifyListener);
		Object model = this.getEditPart().getModel();
		if (model instanceof TreeNodeModel) {
			model = ((TreeNodeModel) model).getData();
		}
		String initialLabelText = textLabel.getText();
		if (model instanceof MappingNode) {
			initialLabelText = ((MappingNode) model).getXmltag();
		}
		if (initialLabelText == null) {
			initialLabelText = ""; //$NON-NLS-1$
		}
		getCellEditor().setValue(initialLabelText);
		IFigure figure = getEditPart().getFigure();
		scaledFont = figure.getFont();
		FontData data = scaledFont.getFontData()[0];
		Dimension fontSize = new Dimension(0, data.getHeight());
		textLabel.translateToAbsolute(fontSize);
		data.setHeight(fontSize.height);
		scaledFont = new Font(null, data);

		text.setFont(scaledFont);
	}

	/**
	 * @see org.eclipse.gef.tools.DirectEditManager#unhookListeners()
	 */
	protected void unhookListeners() {
		super.unhookListeners();
		Text text = (Text) getCellEditor().getControl();
		text.removeVerifyListener(verifyListener);
		verifyListener = null;
	}
}