/**
 * Copyright 2004-2016 Riccardo Solmi. All rights reserved.
 * This file is part of the Whole Platform.
 *
 * The Whole Platform is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The Whole Platform is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
 */
package org.whole.lang.ui.figures;

import java.util.List;

import org.eclipse.draw2d.FigureUtilities;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontMetrics;
import org.whole.lang.ui.layout.ICompositeEntityLayout;
import org.whole.lang.ui.layout.RowLayout;

/**
 * @author Riccardo Solmi
 */
public class StringSeparatedCompositeRowFigure extends CompositeFigure {
	protected String separator;
	protected int separatorWidth;
	protected int separatorAscent;

	public StringSeparatedCompositeRowFigure() {
		this(",", 8);
	}
	public StringSeparatedCompositeRowFigure(String separator, ICompositeEntityLayout layout) {
		super(layout);
		setSeparator(separator);
	}
	public StringSeparatedCompositeRowFigure(String separator, int spacing) {
		super(new RowLayout().withMarginLeft(5).withMarginRight(5).withSpacing(spacing));
		setSeparator(separator);
	}

	public void setSeparator(String separator) {
		FontMetrics fontMetrics = getFontMetrics();
		this.separator = separator;
		this.separatorWidth = fontMetrics.getAverageCharWidth() * separator.length();
		this.separatorAscent = fontMetrics.getHeight()/2;
	}

	protected FontMetrics getFontMetrics() {
		Font localFont = getLocalFont();
		return FigureUtilities.getFontMetrics(localFont != null ? localFont : getFont());
	}

	protected void paintFigure(Graphics g) {
		super.paintFigure(g);

        paintDecorations(g);
	}

	@SuppressWarnings("unchecked")
	protected void paintDecorations(Graphics g) {
		int spacing = Math.max(1, (getLayoutManager().getSpacing() - separatorWidth) / 2);
        if (getLocalFont() != null)
        	g.setFont(getLocalFont());

        List<IEntityFigure> children = (List<IEntityFigure>) getChildren();
        for (int i=0; i<children.size(); i++) {
        	IEntityFigure childFigure = children.get(i);
        	paintChildDecorations(g, i, childFigure.getBounds(), childFigure.getAscent(), spacing);
        }
	}
	protected void paintChildDecorations(Graphics g, int index, Rectangle childBounds, int childAscent, int spacing) {
		if (index < getChildren().size()-1)
			g.drawString(separator, childBounds.right() + spacing, childBounds.y + childAscent - getSeparatorAscent());
	}

	protected int getSeparatorAscent() {
		return separatorAscent;
	}

	@Override
	public Color getLocalForegroundColor() {
		return FigureConstants.contentLighterColor;
	}
}