/******************************************************************************
 * Copyright (c) 2016 Oracle
 * 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:
 *    Ling Hao - initial implementation and ongoing maintenance
 *    Shenxue Zhou - Height multiple by zoom, text alignment
 ******************************************************************************/
package org.eclipse.sapphire.ui.swt.gef.parts;

import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.tools.CellEditorLocator;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ComboBoxCellEditor;
import org.eclipse.sapphire.ui.swt.gef.DiagramConfigurationManager;
import org.eclipse.sapphire.ui.swt.gef.figures.TextFigure;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Text;

/**
 * @author <a href="mailto:ling.hao@oracle.com">Ling Hao</a>
 * @author <a href="mailto:shenxue.zhou@oracle.com">Shenxue Zhou</a>
 */

final public class NodeCellEditorLocator implements CellEditorLocator {

	private TextFigure textFigure;
	private DiagramConfigurationManager manager;

	public NodeCellEditorLocator(DiagramConfigurationManager manager, TextFigure textFigure) {
		this.manager = manager;
		this.textFigure = textFigure;
	}

	public void relocate(CellEditor celleditor) {
		Rectangle labelRect = textFigure.getClientArea();
		Rectangle parentRect = textFigure.getAvailableArea();
		double zoom = manager.getDiagramEditor().getZoomLevel();
		if (celleditor instanceof ComboBoxCellEditor)
		{
			GC gc = new GC(((ComboBoxCellEditor)celleditor).getControl());
			int charHeight = gc.getFontMetrics().getHeight();
			gc.dispose();
			
			CellEditor.LayoutData layoutData = celleditor.getLayoutData();
			// adjust location if space available
			int offset = 0;
			if (layoutData.minimumWidth > labelRect.width && parentRect.x < labelRect.x) {
				offset = Math.min(layoutData.minimumWidth - labelRect.width, labelRect.x - parentRect.x);
			}
			CCombo combo = (CCombo)celleditor.getControl();
			textFigure.translateToAbsolute(labelRect);
			combo.setBounds(labelRect.x - offset, labelRect.y, layoutData.minimumWidth, charHeight);
			return;
		}		
		
		labelRect.x = parentRect.x;
		labelRect.width = parentRect.width;
		// zoom
		labelRect.width = (int) (labelRect.width * zoom);
		labelRect.height = (int) (labelRect.height * zoom);
		
		Text text = (Text) celleditor.getControl();
		Point textSize = text.computeSize(SWT.DEFAULT, SWT.DEFAULT);
				
		if (text.getText().length() == 0) {
			textSize.x = 10;
		}
		Point size = new Point(Math.min(textSize.x, labelRect.width), Math.min(textSize.y, labelRect.height));
		
		// center the cell editor horizontally
		int horizontalOffet = 0;
		switch (textFigure.getHorizontalAlignment()) {
		case SWT.RIGHT:
			if (size.x < labelRect.width) {
				horizontalOffet = labelRect.width - size.x;
			}
			break;
		case SWT.LEFT:
			break;
		default:
			if (size.x < labelRect.width) {
				horizontalOffet = (labelRect.width - size.x + 1) / 2;
			}
			break;
		}

		// center the cell editor vertically
		int verticalOffet = 0;
		switch (textFigure.getVerticalAlignment()) {
		case SWT.BOTTOM:
			if (size.y < labelRect.height) {
				verticalOffet = labelRect.height - size.y;
			}
			break;
		case SWT.TOP:
			break;
		default:
			if (size.y < labelRect.height) {
				verticalOffet = (labelRect.height - size.y + 1) / 2;
			}
			break;
		}
				
		textFigure.translateToAbsolute(labelRect);
		text.setBounds(labelRect.x + horizontalOffet, labelRect.y + verticalOffet, size.x, size.y);
		
	}
	
}