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

#ifndef QLAYOUTENGINE_P_H

#define QLAYOUTENGINE_P_H

//

//  W A R N I N G

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

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "QtGui/qlayoutitem.h"

#include "QtGui/qstyle.h"

QT_BEGIN_NAMESPACE

template <typename T> class QVector;

struct QLayoutStruct

{

    inline void init(int stretchFactor = 0, int minSize = 0) {

        stretch = stretchFactor;

        minimumSize = sizeHint = minSize;

        maximumSize = QLAYOUTSIZE_MAX;

        expansive = false;

        empty = true;

        spacing = 0;

    }

    int smartSizeHint() {

        return (stretch > 0) ? minimumSize : sizeHint;

    }

    int effectiveSpacer(int uniformSpacer) const {

        Q_ASSERT(uniformSpacer >= 0 || spacing >= 0);

        return (uniformSpacer >= 0) ? uniformSpacer : spacing;

    }

    // parameters

    int stretch;

    int sizeHint;

    int maximumSize;

    int minimumSize;

    bool expansive;

    bool empty;

    int spacing;

    // temporary storage

    bool done;

    // result

    int pos;

    int size;

};

Q_GUI_EXPORT void qGeomCalc(QVector<QLayoutStruct> &chain, int start, int count,

                            int pos, int space, int spacer = -1);

Q_GUI_EXPORT QSize qSmartMinSize(const QSize &sizeHint, const QSize &minSizeHint,

                                 const QSize &minSize, const QSize &maxSize,

                                 const QSizePolicy &sizePolicy);

Q_GUI_EXPORT QSize qSmartMinSize(const QWidgetItem *i);

Q_GUI_EXPORT QSize qSmartMinSize(const QWidget *w);

Q_GUI_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,

                                 const QSize &minSize, const QSize &maxSize,

                                 const QSizePolicy &sizePolicy, Qt::Alignment align = 0);

Q_GUI_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = 0);

Q_GUI_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = 0);

Q_GUI_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm);

/*

  Modify total maximum (max), total expansion (exp), and total empty

  when adding boxmax/boxexp.

  Expansive boxes win over non-expansive boxes.

  Non-empty boxes win over empty boxes.

*/

static inline void qMaxExpCalc(int & max, bool &exp, bool &empty,

                               int boxmax, bool boxexp, bool boxempty)

{

    if (exp) {

        if (boxexp)

            max = qMax(max, boxmax);

    } else {

        if (boxexp || (empty && (!boxempty || max == 0)))

            max = boxmax;

        else if (empty == boxempty)

            max = qMin(max, boxmax);

    }

    exp = exp || boxexp;

    empty = empty && boxempty;

}

QT_END_NAMESPACE

#endif // QLAYOUTENGINE_P_H