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# borderlayout.cpp Example File
layouts/borderlayout/borderlayout.cpp

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
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    ** information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
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    ** not clear to you.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        #include <QtGui>

        #include "borderlayout.h"

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

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

        BorderLayout::~BorderLayout()
        {
            QLayoutItem *l;
            while ((l = takeAt(0)))
                delete l;
        }

        void BorderLayout::addItem(QLayoutItem *item)
        {
            add(item, West);
        }

        void BorderLayout::addWidget(QWidget *widget, Position position)
        {
            add(new QWidgetItem(widget), position);
        }

        Qt::Orientations BorderLayout::expandingDirections() const
        {
            return Qt::Horizontal | Qt::Vertical;
        }

        bool BorderLayout::hasHeightForWidth() const
        {
            return false;
        }

        int BorderLayout::count() const
        {
            return list.size();
        }

        QLayoutItem *BorderLayout::itemAt(int index) const
        {
            ItemWrapper *wrapper = list.value(index);
            if (wrapper)
                return wrapper->item;
            else
                return 0;
        }

        QSize BorderLayout::minimumSize() const
        {
            return calculateSize(MinimumSize);
        }

        void BorderLayout::setGeometry(const QRect &rect)
        {
            ItemWrapper *center = 0;
            int eastWidth = 0;
            int westWidth = 0;
            int northHeight = 0;
            int southHeight = 0;
            int centerHeight = 0;
            int i;

            QLayout::setGeometry(rect);

            for (i = 0; i < list.size(); ++i) {
                ItemWrapper *wrapper = list.at(i);
                QLayoutItem *item = wrapper->item;
                Position position = wrapper->position;

                if (position == North) {
                    item->setGeometry(QRect(rect.x(), northHeight, rect.width(),
                                            item->sizeHint().height()));

                    northHeight += item->geometry().height() + spacing();
                } else if (position == South) {
                    item->setGeometry(QRect(item->geometry().x(),
                                            item->geometry().y(), rect.width(),
                                            item->sizeHint().height()));

                    southHeight += item->geometry().height() + spacing();

                    item->setGeometry(QRect(rect.x(),
                                      rect.y() + rect.height() - southHeight + spacing(),
                                      item->geometry().width(),
                                      item->geometry().height()));
                } else if (position == Center) {
                    center = wrapper;
                }
            }

            centerHeight = rect.height() - northHeight - southHeight;

            for (i = 0; i < list.size(); ++i) {
                ItemWrapper *wrapper = list.at(i);
                QLayoutItem *item = wrapper->item;
                Position position = wrapper->position;

                if (position == West) {
                    item->setGeometry(QRect(rect.x() + westWidth, northHeight,
                                            item->sizeHint().width(), centerHeight));

                    westWidth += item->geometry().width() + spacing();
                } else if (position == East) {
                    item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
                                            item->sizeHint().width(), centerHeight));

                    eastWidth += item->geometry().width() + spacing();

                    item->setGeometry(QRect(
                                      rect.x() + rect.width() - eastWidth + spacing(),
                                      northHeight, item->geometry().width(),
                                      item->geometry().height()));
                }
            }

            if (center)
                center->item->setGeometry(QRect(westWidth, northHeight,
                                                rect.width() - eastWidth - westWidth,
                                                centerHeight));
        }

        QSize BorderLayout::sizeHint() const
        {
            return calculateSize(SizeHint);
        }

        QLayoutItem *BorderLayout::takeAt(int index)
        {
            if (index >= 0 && index < list.size()) {
                ItemWrapper *layoutStruct = list.takeAt(index);
                return layoutStruct->item;
            }
            return 0;
        }

        void BorderLayout::add(QLayoutItem *item, Position position)
        {
            list.append(new ItemWrapper(item, position));
        }

        QSize BorderLayout::calculateSize(SizeType sizeType) const
        {
            QSize totalSize;

            for (int i = 0; i < list.size(); ++i) {
                ItemWrapper *wrapper = list.at(i);
                Position position = wrapper->position;
                QSize itemSize;

                if (sizeType == MinimumSize)
                    itemSize = wrapper->item->minimumSize();
                else // (sizeType == SizeHint)
                    itemSize = wrapper->item->sizeHint();

                if (position == North || position == South || position == Center)
                    totalSize.rheight() += itemSize.height();

                if (position == West || position == East || position == Center)
                    totalSize.rwidth() += itemSize.width();
            }
            return totalSize;
        }