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    41 

    42 #ifndef QLAYOUTITEM_H

    43 #define QLAYOUTITEM_H

    44 

    45 #include <QtGui/qsizepolicy.h>

    46 #include <QtCore/qrect.h>

    47 

    48 #include <limits.h>

    49 

    50 QT_BEGIN_HEADER

    51 

    52 QT_BEGIN_NAMESPACE

    53 

    54 QT_MODULE(Gui)

    55 

    56 static const int QLAYOUTSIZE_MAX = INT_MAX/256/16;

    57 

    58 class QLayout;

    59 class QLayoutItem;

    60 class QSpacerItem;

    61 class QWidget;

    62 class QSize;

    63 

    64 class Q_GUI_EXPORT QLayoutItem

    65 {

    66 public:

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

    68     virtual ~QLayoutItem();

    69     virtual QSize sizeHint() const = 0;

    70     virtual QSize minimumSize() const = 0;

    71     virtual QSize maximumSize() const = 0;

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

    73     virtual void setGeometry(const QRect&) = 0;

    74     virtual QRect geometry() const = 0;

    75     virtual bool isEmpty() const = 0;

    76     virtual bool hasHeightForWidth() const;

    77     virtual int heightForWidth(int) const;

    78     virtual int minimumHeightForWidth(int) const;

    79     virtual void invalidate();

    80 

    81     virtual QWidget *widget();

    82     virtual QLayout *layout();

    83     virtual QSpacerItem *spacerItem();

    84 

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

    86     void setAlignment(Qt::Alignment a);

    87     QSizePolicy::ControlTypes controlTypes() const;

    88 

    89 protected:

    90     Qt::Alignment align;

    91 };

    92 

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

    94     : align(aalignment) { }

    95 

    96 class Q_GUI_EXPORT QSpacerItem : public QLayoutItem

    97 {

    98 public:

    99     QSpacerItem(int w, int h,

   100                  QSizePolicy::Policy hData = QSizePolicy::Minimum,

   101                  QSizePolicy::Policy vData = QSizePolicy::Minimum)

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

   103     void changeSize(int w, int h,

   104                      QSizePolicy::Policy hData = QSizePolicy::Minimum,

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

   106     QSize sizeHint() const;

   107     QSize minimumSize() const;

   108     QSize maximumSize() const;

   109     Qt::Orientations expandingDirections() const;

   110     bool isEmpty() const;

   111     void setGeometry(const QRect&);

   112     QRect geometry() const;

   113     QSpacerItem *spacerItem();

   114 

   115 private:

   116     int width;

   117     int height;

   118     QSizePolicy sizeP;

   119     QRect rect;

   120 };

   121 

   122 class Q_GUI_EXPORT QWidgetItem : public QLayoutItem

   123 {

   124     Q_DISABLE_COPY(QWidgetItem)

   125 

   126 public:

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

   128     QSize sizeHint() const;

   129     QSize minimumSize() const;

   130     QSize maximumSize() const;

   131     Qt::Orientations expandingDirections() const;

   132     bool isEmpty() const;

   133     void setGeometry(const QRect&);

   134     QRect geometry() const;

   135     virtual QWidget *widget();

   136 

   137     bool hasHeightForWidth() const;

   138     int heightForWidth(int) const;

   139 

   140 protected:

   141     QWidget *wid;

   142 };

   143 

   144 class Q_GUI_EXPORT QWidgetItemV2 : public QWidgetItem

   145 {

   146 public:

   147     explicit QWidgetItemV2(QWidget *widget);

   148     ~QWidgetItemV2();

   149 

   150     QSize sizeHint() const;

   151     QSize minimumSize() const;

   152     QSize maximumSize() const;

   153     int heightForWidth(int width) const;

   154 

   155 private:

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

   157 

   158     inline bool useSizeCache() const;

   159     void updateCacheIfNecessary() const;

   160     inline void invalidateSizeCache() {

   161         q_cachedMinimumSize.setWidth(Dirty);

   162         q_hfwCacheSize = 0;

   163     }

   164 

   165     mutable QSize q_cachedMinimumSize;

   166     mutable QSize q_cachedSizeHint;

   167     mutable QSize q_cachedMaximumSize;

   168     mutable QSize q_cachedHfws[HfwCacheMaxSize];

   169     mutable short q_firstCachedHfw;

   170     mutable short q_hfwCacheSize;

   171     void *d;

   172 

   173     friend class QWidgetPrivate;

   174 

   175     Q_DISABLE_COPY(QWidgetItemV2)

   176 };

   177 

   178 QT_END_NAMESPACE

   179 

   180 QT_END_HEADER

   181 

   182 #endif // QLAYOUTITEM_H