/*
 * Copyright 2020-2021 MicroEJ Corp. All rights reserved.
 * This library is provided in source code for use, modification and test, subject to license terms.
 * Any modification of the source code will break MicroEJ Corp. warranties on the whole library.
 */
package ej.mwt.style.dimension;

import ej.mwt.Widget;
import ej.mwt.style.Style;
import ej.mwt.util.Alignment;
import ej.mwt.util.Rectangle;

/**
 * Helps the dimensions to lay out a widget with a specific size.
 */
public class DimensionHelper {

	// Prevents initialization.
	private DimensionHelper() {
	}

	/**
	 * Lays out a widget.
	 * <p>
	 * The widget is aligned (according to the style settings) in the given area.
	 *
	 * @param widget
	 *            the widget.
	 * @param bounds
	 *            the bounds.
	 * @param useFixedWidth
	 *            <code>true</code> to use the given fixed width instead of the given width, <code>false</code>
	 *            otherwise.
	 * @param useFixedHeight
	 *            <code>true</code> to use the given fixed height instead of the given height, <code>false</code>
	 *            otherwise.
	 * @param fixedWidth
	 *            the fixed width.
	 * @param fixedHeight
	 *            the fixed height.
	 */
	public static void layOut(Widget widget, Rectangle bounds, boolean useFixedWidth, boolean useFixedHeight,
			int fixedWidth, int fixedHeight) {
		Style style = widget.getStyle();

		int x = bounds.getX();
		int y = bounds.getY();
		int width = bounds.getWidth();
		int height = bounds.getHeight();

		// apply optimal size
		int newWidth;
		int newHeight;
		if (useFixedWidth && fixedWidth < width) {
			newWidth = fixedWidth;
		} else {
			newWidth = width;
		}
		if (useFixedHeight && fixedHeight < height) {
			newHeight = fixedHeight;
		} else {
			newHeight = height;
		}

		// re-align
		int newX = Alignment.computeLeftX(newWidth, x, width, style.getHorizontalAlignment());
		int newY = Alignment.computeTopY(newHeight, y, height, style.getVerticalAlignment());

		bounds.setBounds(newX, newY, newWidth, newHeight);
	}

}