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

#ifndef QLAYOUTITEM_H

#define QLAYOUTITEM_H

#include <QtGui/qsizepolicy.h>

#include <QtCore/qrect.h>

#include <limits.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Gui)

static const int QLAYOUTSIZE_MAX = INT_MAX/256/16;

class QLayout;

class QLayoutItem;

class QSpacerItem;

class QWidget;

class QSize;

class Q_GUI_EXPORT QLayoutItem

{

public:

    inline explicit QLayoutItem(Qt::Alignment alignment = 0);

    virtual ~QLayoutItem();

    virtual QSize sizeHint() const = 0;

    virtual QSize minimumSize() const = 0;

    virtual QSize maximumSize() const = 0;

    virtual Qt::Orientations expandingDirections() const = 0;

    virtual void setGeometry(const QRect&) = 0;

    virtual QRect geometry() const = 0;

    virtual bool isEmpty() const = 0;

    virtual bool hasHeightForWidth() const;

    virtual int heightForWidth(int) const;

    virtual int minimumHeightForWidth(int) const;

    virtual void invalidate();

    virtual QWidget *widget();

    virtual QLayout *layout();

    virtual QSpacerItem *spacerItem();

    Qt::Alignment alignment() const { return align; }

    void setAlignment(Qt::Alignment a);

    QSizePolicy::ControlTypes controlTypes() const;

protected:

    Qt::Alignment align;

};

inline QLayoutItem::QLayoutItem(Qt::Alignment aalignment)

    : align(aalignment) { }

class Q_GUI_EXPORT QSpacerItem : public QLayoutItem

{

public:

    QSpacerItem(int w, int h,

                 QSizePolicy::Policy hData = QSizePolicy::Minimum,

                 QSizePolicy::Policy vData = QSizePolicy::Minimum)

        : width(w), height(h), sizeP(hData, vData) { }

    void changeSize(int w, int h,

                     QSizePolicy::Policy hData = QSizePolicy::Minimum,

                     QSizePolicy::Policy vData = QSizePolicy::Minimum);

    QSize sizeHint() const;

    QSize minimumSize() const;

    QSize maximumSize() const;

    Qt::Orientations expandingDirections() const;

    bool isEmpty() const;

    void setGeometry(const QRect&);

    QRect geometry() const;

    QSpacerItem *spacerItem();

private:

    int width;

    int height;

    QSizePolicy sizeP;

    QRect rect;

};

class Q_GUI_EXPORT QWidgetItem : public QLayoutItem

{

    Q_DISABLE_COPY(QWidgetItem)

public:

    explicit QWidgetItem(QWidget *w) : wid(w) { }

    QSize sizeHint() const;

    QSize minimumSize() const;

    QSize maximumSize() const;

    Qt::Orientations expandingDirections() const;

    bool isEmpty() const;

    void setGeometry(const QRect&);

    QRect geometry() const;

    virtual QWidget *widget();

    bool hasHeightForWidth() const;

    int heightForWidth(int) const;

protected:

    QWidget *wid;

};

class Q_GUI_EXPORT QWidgetItemV2 : public QWidgetItem

{

public:

    explicit QWidgetItemV2(QWidget *widget);

    ~QWidgetItemV2();

    QSize sizeHint() const;

    QSize minimumSize() const;

    QSize maximumSize() const;

    int heightForWidth(int width) const;

private:

    enum { Dirty = -123, HfwCacheMaxSize = 3 };

    inline bool useSizeCache() const;

    void updateCacheIfNecessary() const;

    inline void invalidateSizeCache() {

        q_cachedMinimumSize.setWidth(Dirty);

        q_hfwCacheSize = 0;

    }

    mutable QSize q_cachedMinimumSize;

    mutable QSize q_cachedSizeHint;

    mutable QSize q_cachedMaximumSize;

    mutable QSize q_cachedHfws[HfwCacheMaxSize];

    mutable short q_firstCachedHfw;

    mutable short q_hfwCacheSize;

    void *d;

    friend class QWidgetPrivate;

    Q_DISABLE_COPY(QWidgetItemV2)

};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QLAYOUTITEM_H