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#include <QtGui>

#include "flowlayout.h"

//! [1]

FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)

    : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)

{

    setContentsMargins(margin, margin, margin, margin);

}

FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)

    : m_hSpace(hSpacing), m_vSpace(vSpacing)

{

    setContentsMargins(margin, margin, margin, margin);

}

//! [1]

//! [2]

FlowLayout::~FlowLayout()

{

    QLayoutItem *item;

    while ((item = takeAt(0)))

        delete item;

}

//! [2]

//! [3]

void FlowLayout::addItem(QLayoutItem *item)

{

    itemList.append(item);

}

//! [3]

//! [4]

int FlowLayout::horizontalSpacing() const

{

    if (m_hSpace >= 0) {

        return m_hSpace;

    } else {

        return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);

    }

}

int FlowLayout::verticalSpacing() const

{

    if (m_vSpace >= 0) {

        return m_vSpace;

    } else {

        return smartSpacing(QStyle::PM_LayoutVerticalSpacing);

    }

}

//! [4]

//! [5]

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;

}

//! [5]

//! [6]

Qt::Orientations FlowLayout::expandingDirections() const

{

    return 0;

}

//! [6]

//! [7]

bool FlowLayout::hasHeightForWidth() const

{

    return true;

}

int FlowLayout::heightForWidth(int width) const

{

    int height = doLayout(QRect(0, 0, width, 0), true);

    return height;

}

//! [7]

//! [8]

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;

}

//! [8]

//! [9]

int FlowLayout::doLayout(const QRect &rect, bool testOnly) const

{

    int left, top, right, bottom;

    getContentsMargins(&left, &top, &right, &bottom);

    QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);

    int x = effectiveRect.x();

    int y = effectiveRect.y();

    int lineHeight = 0;

//! [9]

//! [10]

    QLayoutItem *item;

    foreach (item, itemList) {

        QWidget *wid = item->widget();

        int spaceX = horizontalSpacing();

        if (spaceX == -1)

            spaceX = wid->style()->layoutSpacing(

                QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);

        int spaceY = verticalSpacing();

        if (spaceY == -1)

            spaceY = wid->style()->layoutSpacing(

                QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);

//! [10]

//! [11]

        int nextX = x + item->sizeHint().width() + spaceX;

        if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {

            x = effectiveRect.x();

            y = y + lineHeight + spaceY;

            nextX = x + item->sizeHint().width() + spaceX;

            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() + bottom;

}

//! [11]

//! [12]

int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const

{

    QObject *parent = this->parent();

    if (!parent) {

        return -1;

    } else if (parent->isWidgetType()) {

        QWidget *pw = static_cast<QWidget *>(parent);

        return pw->style()->pixelMetric(pm, 0, pw);

    } else {

        return static_cast<QLayout *>(parent)->spacing();

    }

}

//! [12]