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flowlayout.cpp Example File
layouts/flowlayout/flowlayout.cpp

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 #include <QtGui>

 #include "flowlayout.h"

 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 >= 0 && index < 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 &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->minimumSize());

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

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

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

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

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