/*******************************************************************************
 * Copyright (c) 2007, 2009 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:
 * 	   Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
 *                                               - fix for bug 178280
 *     IBM Corporation - API refactoring and general maintenance
 *******************************************************************************/

package org.eclipse.jface.layout;

import org.eclipse.jface.viewers.ColumnLayoutData;
import org.eclipse.jface.viewers.ColumnPixelData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Widget;

/**
 * The TableColumnLayout is the {@link Layout} used to maintain
 * {@link TableColumn} sizes in a {@link Table}.
 * 
 * <p>
 * <b>You can only add the {@link Layout} to a container whose <i>only</i> child
 * is the {@link Table} control you want the {@link Layout} applied to. Don't
 * assign the layout directly the {@link Table}</b>
 * </p>
 * 
 * @since 1.0
 */
public class TableColumnLayout extends AbstractColumnLayout {

	/**
	 * {@inheritDoc}
	 * 
	 */
	protected int getColumnCount(Scrollable tableTree) {
		return ((Table) tableTree).getColumnCount();
	}

	/**
	 * {@inheritDoc}
	 * 
	 */
	protected void setColumnWidths(Scrollable tableTree, int[] widths) {
		TableColumn[] columns = ((Table) tableTree).getColumns();
		for (int i = 0; i < widths.length; i++) {
			columns[i].setWidth(widths[i]);
		}
	}

	/**
	 * {@inheritDoc}
	 * 
	 */
	protected ColumnLayoutData getLayoutData(Scrollable tableTree,
			int columnIndex) {
		TableColumn column = ((Table) tableTree).getColumn(columnIndex);
		return (ColumnLayoutData) column.getData(LAYOUT_DATA);
	}

	Composite getComposite(Widget column) {
		return ((TableColumn) column).getParent().getParent();
	}

	/**
	 * @since 1.3
	 */
	protected void updateColumnData(Widget column) {
		TableColumn tColumn = (TableColumn) column;
		Table t = tColumn.getParent();
		
		if( ! IS_GTK || t.getColumn(t.getColumnCount()-1) != tColumn ){
			tColumn.setData(LAYOUT_DATA,
					new ColumnPixelData(tColumn.getWidth()));
			layout(t.getParent(), true);
		}	
	}
}