/*******************************************************************************
 * Copyright (c) 2000, 2004 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.forms.widgets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;

/**
 * Layout data used in conjunction with <code>HTMLTableLayout</code>.
 * Children in a composite that uses this layout should call <samp>setLayoutData
 * </samp> and pass an instance of this class to control physical placement in
 * the parent.
 * 
 * @see TableWrapLayout
 * @since 3.0
 */
public final class TableWrapData {
	/**
	 * The control will be left-justified.
	 */
	public static final int LEFT = 1 << 1;

	/**
	 * The control will be centered horizontally.
	 */
	public static final int CENTER = 1 << 2;

	/**
	 * The control will be right-justified.
	 */
	public static final int RIGHT = 1 << 3;

	/**
	 * The control will be aligned with the top of the cell.
	 */
	public static final int TOP = 1 << 4;

	/**
	 * The control will be centered vertically.
	 */
	public static final int MIDDLE = 1 << 5;

	/**
	 * The control will be aligned with the bottom of the cell.
	 */
	public static final int BOTTOM = 1 << 6;

	/**
	 * The control will have the same width as the column it occupies.
	 */
	public static final int FILL = 1 << 7;

	/**
	 * In addition to filling width or height, the control will take part in
	 * allocation of any excess space. Note that this constant can only be
	 * passed to the constructor (cannot be directly assigned to
	 * <code>align</code> variable).
	 */
	public static final int FILL_GRAB = 1 << 8;

	/**
	 * Number of columns to span (default is 1).
	 */
	public int colspan = 1;

	/**
	 * Number of rows to span (default is 1).
	 */
	public int rowspan = 1;

	/**
	 * Horizontal alignment (LEFT, CENTER, RIGHT or FILL; default is LEFT).
	 */
	public int align = LEFT;

	/**
	 * Vertical alignment (TOP, MIDDLE, BOTTOM or FILL; default is TOP).
	 */
	public int valign = TOP;

	/**
	 * Horizontal indent (default is 0).
	 */
	public int indent = 0;

	/**
	 * Maximum width of the control (default is SWT.DEFAULT).
	 */
	public int maxWidth = SWT.DEFAULT;

	/**
	 * Maximum height of the control (default is SWT.DEFAULT).
	 */
	public int maxHeight = SWT.DEFAULT;

	/**
	 * Height hint of the control (default is SWT.DEFAULT).
	 */
	public int heightHint = SWT.DEFAULT;

	/**
	 * If <code>true</code>, take part in excess horizontal space
	 * distribution. (default is <code>false</code>).
	 */
	public boolean grabHorizontal;

	/**
	 * If <code>true</code>, will grab any excess vertical space (default is
	 * <code>false</code>). Note that since TableWrapLayout works top-down
	 * and does not grows to fill the parent, this only applies to local excess
	 * space created by fixed-height children that span multiple rows.
	 */
	public boolean grabVertical;

	int childIndex;

	boolean isItemData = true;

	int compWidth;

	Point compSize;

	/**
	 * The default constructor.
	 */
	public TableWrapData() {
	}

	/**
	 * The convinience constructor - allows passing the horizontal alignment
	 * style.
	 * 
	 * @param align
	 *            horizontal alignment (LEFT, MIDDLE, RIGHT, FILL or FILL_GRAB).
	 */
	public TableWrapData(int align) {
		this(align, TOP, 1, 1);
	}

	/**
	 * The convinience constructor - allows passing the alignment styles.
	 * 
	 * @param align
	 *            horizontal alignment (LEFT, CENTER, RIGHT, FILL or FILL_GRAB).
	 * @param valign
	 *            vertical alignment (TOP, MIDDLE, BOTTOM, FILL or FILL_GRAB).
	 */
	public TableWrapData(int align, int valign) {
		this(align, valign, 1, 1);
	}

	/**
	 * The convinience constructor - allows passing the alignment styles, column
	 * and row spans.
	 * 
	 * @param align
	 *            horizontal alignment (LEFT, CENTER, RIGHT, FILL or FILL_GRAB).
	 * @param valign
	 *            vertical alignment (TOP, MIDDLE, BOTTOM, FILL or FILL_GRAB)
	 * @param rowspan
	 *            row span (1 or more)
	 * @param colspan
	 *            column span (1 or more)
	 */
	public TableWrapData(int align, int valign, int rowspan, int colspan) {
		if (align != LEFT && align != CENTER && align != RIGHT && align != FILL
				&& align != FILL_GRAB)
			SWT.error(SWT.ERROR_INVALID_ARGUMENT, null, "align"); //$NON-NLS-1$
		if (valign != TOP && valign != MIDDLE && valign != BOTTOM
				&& valign != FILL && valign != FILL_GRAB)
			SWT.error(SWT.ERROR_INVALID_ARGUMENT, null, "valign"); //$NON-NLS-1$
		if (rowspan < 1)
			SWT.error(SWT.ERROR_INVALID_ARGUMENT, null, "rowspan"); //$NON-NLS-1$
		if (colspan < 1)
			SWT.error(SWT.ERROR_INVALID_ARGUMENT, null, "colspan"); //$NON-NLS-1$
		if (align == FILL_GRAB) {
			this.align = FILL;
			grabHorizontal = true;
		} else
			this.align = align;
		if (valign == FILL_GRAB) {
			this.valign = FILL;
			grabVertical = true;
		} else
			this.valign = valign;
		this.rowspan = rowspan;
		this.colspan = colspan;
	}
}