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/*******************************************************************************
* 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;
}
}
}
}
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