Padder.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 * 
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 * This file is part of PlantUML.
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
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 * Original Author:  Arnaud Roques
 * 
 *
 */
package net.sourceforge.plantuml.skin;

import net.sourceforge.plantuml.annotation.Fast;
import net.sourceforge.plantuml.klimt.color.HColor;
import net.sourceforge.plantuml.klimt.color.HColors;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.klimt.shape.TextBlock;
import net.sourceforge.plantuml.klimt.shape.URectangle;
import net.sourceforge.plantuml.style.ClockwiseTopRightBottomLeft;

public class Padder {

	private final ClockwiseTopRightBottomLeft margin;
	private final ClockwiseTopRightBottomLeft padding;
	private final HColor backgroundColor;
	private final HColor borderColor;
	private final double roundCorner;

	public static final Padder NONE = new Padder(ClockwiseTopRightBottomLeft.none(), ClockwiseTopRightBottomLeft.none(),
			null, null, 0);

	@Override
	public String toString() {
		return "" + margin + "/" + padding + "/" + borderColor + "/" + backgroundColor;
	}

	private Padder(ClockwiseTopRightBottomLeft margin, ClockwiseTopRightBottomLeft padding, HColor backgroundColor,
			HColor borderColor, double roundCorner) {
		this.margin = margin;
		this.padding = padding;
		this.borderColor = borderColor;
		this.backgroundColor = backgroundColor;
		this.roundCorner = roundCorner;
	}

	public Padder withMargin(ClockwiseTopRightBottomLeft margin) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withPadding(ClockwiseTopRightBottomLeft padding) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withBackgroundColor(HColor backgroundColor) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withBorderColor(HColor borderColor) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withRoundCorner(double roundCorner) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public final ClockwiseTopRightBottomLeft getMargin() {
		return margin;
	}

	public final ClockwiseTopRightBottomLeft getPadding() {
		return padding;
	}

	public final HColor getBackgroundColor() {
		return backgroundColor;
	}

	public final HColor getBorderColor() {
		return borderColor;
	}

	public TextBlock apply(final TextBlock orig) {
		if (this == NONE)
			return orig;

		return new TextBlock() {
			@Fast
			public XDimension2D calculateDimension(StringBounder stringBounder) {
				return padding.apply(margin.apply(orig.calculateDimension(stringBounder)));
			}

			public void drawU(UGraphic ug) {
				ug = ug.apply(margin.getTranslate());
				UGraphic ug2 = ug;
				if (borderColor == null)
					ug2 = ug2.apply(HColors.none());
				else
					ug2 = ug2.apply(borderColor);

				if (backgroundColor == null)
					ug2 = ug2.apply(HColors.none().bg());
				else
					ug2 = ug2.apply(backgroundColor.bg());

				final XDimension2D originalDim = orig.calculateDimension(ug.getStringBounder());
				final URectangle rect = URectangle.build(padding.apply(originalDim)).rounded(roundCorner);
				ug2.draw(rect);
				orig.drawU(ug.apply(padding.getTranslate()));
			}
		};
	}
}