/****************************************************************************

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** General Public License version 2.1 as published by the Free Software

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****************************************************************************/

#ifndef QGRAPHICSLAYOUT_P_H

#define QGRAPHICSLAYOUT_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtCore/qglobal.h>

#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW

#include "qgraphicslayout.h"

#include "qgraphicslayoutitem_p.h"

#include <QtGui/qstyle.h>

#include <QtGui/qwidget.h>

#include <QtGui/qstyleoption.h>

QT_BEGIN_NAMESPACE

class QGraphicsLayoutItem;

class QGraphicsWidget;

#ifdef QT_DEBUG

inline bool qt_graphicsLayoutDebug()

{

    static int checked_env = -1;

    if(checked_env == -1)

        checked_env = !!qgetenv("QT_GRAPHICSLAYOUT_DEBUG").toInt();

    return checked_env;

}

#endif

class QLayoutStyleInfo

{

public:

    inline QLayoutStyleInfo() { invalidate(); }

    inline QLayoutStyleInfo(QStyle *style, QWidget *widget)

        : m_valid(true), m_style(style), m_widget(widget) 

    {

        Q_ASSERT(style);

        if (widget) //###

            m_styleOption.initFrom(widget);

        m_defaultSpacing[0] = style->pixelMetric(QStyle::PM_LayoutHorizontalSpacing);

        m_defaultSpacing[1] = style->pixelMetric(QStyle::PM_LayoutVerticalSpacing);

    }

    inline void invalidate() { m_valid = false; m_style = 0; m_widget = 0; }

    inline QStyle *style() const { return m_style; }

    inline QWidget *widget() const { return m_widget; }

    inline bool operator==(const QLayoutStyleInfo &other)

        { return m_style == other.m_style && m_widget == other.m_widget; }

    inline bool operator!=(const QLayoutStyleInfo &other)

        { return !(*this == other); }

    inline void setDefaultSpacing(Qt::Orientation o, qreal spacing){

        if (spacing >= 0)

            m_defaultSpacing[o - 1] = spacing;

    }

    inline qreal defaultSpacing(Qt::Orientation o) const {

        return m_defaultSpacing[o - 1];

    }

    inline qreal perItemSpacing(QSizePolicy::ControlType control1, 

                                  QSizePolicy::ControlType control2,

                                  Qt::Orientation orientation) const

    {

        Q_ASSERT(style());

        return style()->layoutSpacing(control1, control2, orientation, &m_styleOption, widget());

    }

private:

    bool m_valid;

    QStyle *m_style;

    QWidget *m_widget;

    QStyleOption m_styleOption;

    qreal m_defaultSpacing[2];

};

class Q_AUTOTEST_EXPORT QGraphicsLayoutPrivate : public QGraphicsLayoutItemPrivate

{

    Q_DECLARE_PUBLIC(QGraphicsLayout)

public:

    QGraphicsLayoutPrivate() : QGraphicsLayoutItemPrivate(0, true), left(-1.0), top(-1.0), right(-1.0), bottom(-1.0), 

        activated(true) { }

    void reparentChildItems(QGraphicsItem *newParent);

    void getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const;

    Qt::LayoutDirection visualDirection() const;

    void addChildLayoutItem(QGraphicsLayoutItem *item);

    void activateRecursive(QGraphicsLayoutItem *item);

    qreal left, top, right, bottom;

    bool activated;

};

QT_END_NAMESPACE

#endif //QT_NO_GRAPHICSVIEW

#endif