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#include "gridlayout.h"

#include <QGraphicsWidget>

#include <QDebug>

GridLayoutAttached::GridLayoutAttached(QObject *parent)

: QObject(parent), m_row(-1), m_column(-1), m_rowspan(1), m_colspan(1), m_alignment(-1), m_rowStretch(-1),

    m_colStretch(-1), m_rowSpacing(-1), m_colSpacing(-1), m_rowPrefHeight(-1), m_rowMaxHeight(-1), m_rowMinHeight(-1),

    m_rowFixHeight(-1), m_colPrefwidth(-1), m_colMaxwidth(-1), m_colMinwidth(-1), m_colFixwidth(-1)

{

}

void GridLayoutAttached::setAlignment(Qt::Alignment a)

{

    if (m_alignment != a) {

        m_alignment = a;

        emit alignmentChanged(reinterpret_cast<QGraphicsLayoutItem*>(parent()), m_alignment);

    }

}

QHash<QGraphicsLayoutItem*, GridLayoutAttached*> GraphicsGridLayoutObject::attachedProperties;

GraphicsGridLayoutObject::GraphicsGridLayoutObject(QObject *parent)

: QObject(parent)

{

}

GraphicsGridLayoutObject::~GraphicsGridLayoutObject()

{

}

void GraphicsGridLayoutObject::addWidget(QGraphicsWidget *widget)

{

    //use attached properties

    if (QObject *obj = attachedProperties.value(qobject_cast<QGraphicsLayoutItem*>(widget))) {

        int row = static_cast<GridLayoutAttached *>(obj)->row();

        int column = static_cast<GridLayoutAttached *>(obj)->column();

        int rowSpan = static_cast<GridLayoutAttached *>(obj)->rowSpan();

        int columnSpan = static_cast<GridLayoutAttached *>(obj)->columnSpan();

        if (row == -1 || column == -1) {

            qWarning() << "Must set row and column for an item in a grid layout";

            return;

        }

        addItem(widget, row, column, rowSpan, columnSpan);

    }

}

void GraphicsGridLayoutObject::addLayoutItem(QGraphicsLayoutItem *item)

{

    //use attached properties

    if (GridLayoutAttached *obj = attachedProperties.value(item)) {

        int row = obj->row();

        int column = obj->column();

        int rowSpan = obj->rowSpan();

        int columnSpan = obj->columnSpan();

        Qt::Alignment alignment = obj->alignment();

        if (row == -1 || column == -1) {

            qWarning() << "Must set row and column for an item in a grid layout";

            return;

        }

        if (obj->rowSpacing() != -1)

            setRowSpacing(row, obj->rowSpacing());

        if (obj->columnSpacing() != -1)

            setColumnSpacing(column, obj->columnSpacing());

        if (obj->rowStretchFactor() != -1)

            setRowStretchFactor(row, obj->rowStretchFactor());

        if (obj->columnStretchFactor() != -1)

            setColumnStretchFactor(column, obj->columnStretchFactor());

        if (obj->rowPreferredHeight() != -1)

            setRowPreferredHeight(row, obj->rowPreferredHeight());

        if (obj->rowMaximumHeight() != -1)

            setRowMaximumHeight(row, obj->rowMaximumHeight());

        if (obj->rowMinimumHeight() != -1)

            setRowMinimumHeight(row, obj->rowMinimumHeight());

        if (obj->rowFixedHeight() != -1)

            setRowFixedHeight(row, obj->rowFixedHeight());

        if (obj->columnPreferredWidth() != -1)

            setColumnPreferredWidth(row, obj->columnPreferredWidth());

        if (obj->columnMaximumWidth() != -1)

            setColumnMaximumWidth(row, obj->columnMaximumWidth());

        if (obj->columnMinimumWidth() != -1)

            setColumnMinimumWidth(row, obj->columnMinimumWidth());

        if (obj->columnFixedWidth() != -1)

            setColumnFixedWidth(row, obj->columnFixedWidth());

        addItem(item, row, column, rowSpan, columnSpan);

        if (alignment != -1)

            setAlignment(item, alignment);

        QObject::connect(obj, SIGNAL(alignmentChanged(QGraphicsLayoutItem*, Qt::Alignment)),

                         this, SLOT(updateAlignment(QGraphicsLayoutItem*, Qt::Alignment)));

    }

}

void GraphicsGridLayoutObject::removeAt(int index)

{

    QGraphicsLayoutItem *item = itemAt(index);

    if (item) {

        GridLayoutAttached *obj = attachedProperties.value(item);

        obj->disconnect(this);

        attachedProperties.remove(item);

    }

    QGraphicsGridLayout::removeAt(index);

}

void GraphicsGridLayoutObject::clearChildren()

{

    // do not delete the removed items; they will be deleted by the QML engine

    while (count() > 0)

        removeAt(count()-1);

}

qreal GraphicsGridLayoutObject::spacing() const

{

    if (verticalSpacing() == horizontalSpacing())

        return verticalSpacing();

    return -1; 

}

qreal GraphicsGridLayoutObject::contentsMargin() const

{

    qreal a, b, c, d;

    getContentsMargins(&a, &b, &c, &d);

    if (a == b && a == c && a == d)

        return a;

    return -1;

}

void GraphicsGridLayoutObject::setContentsMargin(qreal m)

{

    setContentsMargins(m, m, m, m);

}

void GraphicsGridLayoutObject::updateAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment)

{

    QGraphicsGridLayout::setAlignment(item, alignment);

}

GridLayoutAttached *GraphicsGridLayoutObject::qmlAttachedProperties(QObject *obj)

{

    GridLayoutAttached *rv = new GridLayoutAttached(obj);

    if (qobject_cast<QGraphicsLayoutItem*>(obj))

        attachedProperties.insert(qobject_cast<QGraphicsLayoutItem*>(obj), rv);

    return rv;

}