Qt 4.0: flowlayout.cpp Example File (layouts/flowlayout/flowlayout.cpp)

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

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        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
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    ** and appearing in the file LICENSE.GPL included in the packaging of
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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();
        }