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<pre> /****************************************************************************
 **
 ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
 ** General Public Licensing requirements will be met:
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 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

 #include &lt;QtGui&gt;

 #include &quot;flowlayout.h&quot;

 FlowLayout::FlowLayout(QWidget *parent, int margin, int spacing)
     : QLayout(parent)
 {
     setMargin(margin);
     setSpacing(spacing);
 }

 FlowLayout::FlowLayout(int spacing)
 {
     setSpacing(spacing);
 }

 FlowLayout::~FlowLayout()
 {
     QLayoutItem *item;
     while ((item = takeAt(0)))
         delete item;
 }

 void FlowLayout::addItem(QLayoutItem *item)
 {
     itemList.append(item);
 }

 int FlowLayout::count() const
 {
     return itemList.size();
 }

 QLayoutItem *FlowLayout::itemAt(int index) const
 {
     return itemList.value(index);
 }

 QLayoutItem *FlowLayout::takeAt(int index)
 {
     if (index &gt;= 0 &amp;&amp; index &lt; itemList.size())
         return itemList.takeAt(index);
     else
         return 0;
 }

 Qt::Orientations FlowLayout::expandingDirections() const
 {
     return 0;
 }

 bool FlowLayout::hasHeightForWidth() const
 {
     return true;
 }

 int FlowLayout::heightForWidth(int width) const
 {
     int height = doLayout(QRect(0, 0, width, 0), true);
     return height;
 }

 void FlowLayout::setGeometry(const QRect &amp;rect)
 {
     QLayout::setGeometry(rect);
     doLayout(rect, false);
 }

 QSize FlowLayout::sizeHint() const
 {
     return minimumSize();
 }

 QSize FlowLayout::minimumSize() const
 {
     QSize size;
     QLayoutItem *item;
     foreach (item, itemList)
         size = size.expandedTo(item-&gt;minimumSize());

     size += QSize(2*margin(), 2*margin());
     return size;
 }

 int FlowLayout::doLayout(const QRect &amp;rect, bool testOnly) const
 {
     int x = rect.x();
     int y = rect.y();
     int lineHeight = 0;

     QLayoutItem *item;
     foreach (item, itemList) {
         int nextX = x + item-&gt;sizeHint().width() + spacing();
         if (nextX - spacing() &gt; rect.right() &amp;&amp; lineHeight &gt; 0) {
             x = rect.x();
             y = y + lineHeight + spacing();
             nextX = x + item-&gt;sizeHint().width() + spacing();
             lineHeight = 0;
         }

         if (!testOnly)
             item-&gt;setGeometry(QRect(QPoint(x, y), item-&gt;sizeHint()));

         x = nextX;
         lineHeight = qMax(lineHeight, item-&gt;sizeHint().height());
     }
     return y + lineHeight - rect.y();
 }</pre>
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