/******************************************************************************* * 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 Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.layout;import org.eclipse.swt.*;import org.eclipse.swt.graphics.*;import org.eclipse.swt.widgets.*;/** * <code>FillLayout</code> is the simplest layout class. It lays out  * controls in a single row or column, forcing them to be the same size.  * <p> * Initially, the controls will all be as tall as the tallest control,  * and as wide as the widest. <code>FillLayout</code> does not wrap,  * but you can specify margins and spacing. You might use it to  * lay out buttons in a task bar or tool bar, or to stack checkboxes  * in a <code>Group</code>. <code>FillLayout</code> can also be used  * when a <code>Composite</code> only has one child. For example,  * if a <code>Shell</code> has a single <code>Group</code> child,  * <code>FillLayout</code> will cause the <code>Group</code> to  * completely fill the <code>Shell</code> (if margins are 0). * </p> * <p> * Example code: first a <code>FillLayout</code> is created and * its type field is set, and then the layout is set into the  * <code>Composite</code>. Note that in a <code>FillLayout</code>, * children are always the same size, and they fill all available space. * <pre> * 		FillLayout fillLayout = new FillLayout(); * 		fillLayout.type = SWT.VERTICAL; * 		shell.setLayout(fillLayout); * </pre> * </p> */public final class FillLayout extends Layout {	/**	 * type specifies how controls will be positioned 	 * within the layout.	 *	 * The default value is HORIZONTAL.	 *	 * Possible values are:	 *	 * HORIZONTAL: Position the controls horizontally from left to right	 * VERTICAL: Position the controls vertically from top to bottom	 */	public int type = SWT.HORIZONTAL;		/**	 * marginWidth specifies the number of pixels of horizontal margin	 * that will be placed along the left and right edges of the layout.	 *	 * The default value is 0.	 * 	 * @since 3.0	 */ 	public int marginWidth = 0; 		/**	 * marginHeight specifies the number of pixels of vertical margin	 * that will be placed along the top and bottom edges of the layout.	 *	 * The default value is 0.	 * 	 * @since 3.0	 */ 	public int marginHeight = 0; 	 	/**	 * spacing specifies the number of pixels between the edge of one cell	 * and the edge of its neighbouring cell.	 *	 * The default value is 0.	 * 	 * @since 3.0	 */	public int spacing = 0;	/** * Constructs a new instance of this class. */public FillLayout () {}/** * Constructs a new instance of this class given the type. * * @param type the type of fill layout *  * @since 2.0 */public FillLayout (int type) {	this.type = type;}protected Point computeSize (Composite composite, int wHint, int hHint, boolean flushCache) {	Control [] children = composite.getChildren ();	int count = children.length;	int maxWidth = 0, maxHeight = 0;	for (int i=0; i<count; i++) {		Control child = children [i];		Point size = child.computeSize (SWT.DEFAULT, SWT.DEFAULT, flushCache);		maxWidth = Math.max (maxWidth, size.x);		maxHeight = Math.max (maxHeight, size.y);	}	int width = 0, height = 0;	if (type == SWT.HORIZONTAL) {		width = count * maxWidth;		if (count != 0) width += (count - 1) * spacing;		height = maxHeight;	} else {		width = maxWidth;		height = count * maxHeight;		if (count != 0) height += (count - 1) * spacing;	}	width += marginWidth * 2;	height += marginHeight * 2;	return new Point (width, height);}protected void layout (Composite composite, boolean flushCache) {	Rectangle rect = composite.getClientArea ();	Control [] children = composite.getChildren ();	int count = children.length;	if (count == 0) return;	int width = rect.width - marginWidth * 2;	int height = rect.height - marginHeight * 2;	if (type == SWT.HORIZONTAL) {		width -= (count - 1) * spacing;		int x = rect.x + marginWidth, extra = width % count;		int y = rect.y + marginHeight, cellWidth = width / count;		for (int i=0; i<count; i++) {			Control child = children [i];			int childWidth = cellWidth;			if (i == 0) {				childWidth += extra / 2;			} else {				if (i == count - 1) childWidth += (extra + 1) / 2;			}			child.setBounds (x, y, childWidth, height);			x += childWidth + spacing;		}	} else {		height -= (count - 1) * spacing;		int x = rect.x + marginWidth, cellHeight = height / count;		int y = rect.y + marginHeight, extra = height % count;		for (int i=0; i<count; i++) {			Control child = children [i];			int childHeight = cellHeight;			if (i == 0) {				childHeight += extra / 2;			} else {				if (i == count - 1) childHeight += (extra + 1) / 2;			}			child.setBounds (x, y, width, childHeight);			y += childHeight + spacing;		}	}}}