Qt 4.3: flowlayout.cpp Example File (layouts/flowlayout/flowlayout.cpp)

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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();
     }