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package org.eclipse.swt.layout;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is 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
*/
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,
* and you cannot specify margins or 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>.
* </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;
/**
* 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 pt = child.computeSize (SWT.DEFAULT, SWT.DEFAULT, flushCache);
maxWidth = Math.max (maxWidth, pt.x);
maxHeight = Math.max (maxHeight, pt.y);
}
if (type == SWT.HORIZONTAL) {
return new Point (count * maxWidth, maxHeight);
}
return new Point (maxWidth, count * maxHeight);
}
protected void layout (Composite composite, boolean flushCache) {
Rectangle rect = composite.getClientArea ();
Control [] children = composite.getChildren ();
int count = children.length;
if (count == 0) return;
if (type == SWT.HORIZONTAL) {
int x = rect.x + ((rect.width % count) / 2);
int width = rect.width / count;
int y = rect.y, height = rect.height;
for (int i=0; i<count; i++) {
Control child = children [i];
child.setBounds (x, y, width, height);
x += width;
}
return;
}
int x = rect.x, width = rect.width;
int y = rect.y + ((rect.height % count) / 2);
int height = rect.height / count;
for (int i=0; i<count; i++) {
Control child = children [i];
child.setBounds (x, y, width, height);
y += height;
}
}
}
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