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    41 

    42 #ifndef QLAYOUTENGINE_P_H

    43 #define QLAYOUTENGINE_P_H

    44 

    45 //

    46 //  W A R N I N G

    47 //  -------------

    48 //

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

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

    51 // version without notice, or even be removed.

    52 //

    53 // We mean it.

    54 //

    55 

    56 #include "QtGui/qlayoutitem.h"

    57 #include "QtGui/qstyle.h"

    58 

    59 QT_BEGIN_NAMESPACE

    60 

    61 template <typename T> class QVector;

    62 

    63 struct QLayoutStruct

    64 {

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

    66         stretch = stretchFactor;

    67         minimumSize = sizeHint = minSize;

    68         maximumSize = QLAYOUTSIZE_MAX;

    69         expansive = false;

    70         empty = true;

    71         spacing = 0;

    72     }

    73 

    74     int smartSizeHint() {

    75         return (stretch > 0) ? minimumSize : sizeHint;

    76     }

    77     int effectiveSpacer(int uniformSpacer) const {

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

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

    80     }

    81 

    82     // parameters

    83     int stretch;

    84     int sizeHint;

    85     int maximumSize;

    86     int minimumSize;

    87     bool expansive;

    88     bool empty;

    89     int spacing;

    90 

    91     // temporary storage

    92     bool done;

    93 

    94     // result

    95     int pos;

    96     int size;

    97 };

    98 

    99 

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

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

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

   103                                  const QSize &minSize, const QSize &maxSize,

   104                                  const QSizePolicy &sizePolicy);

   105 Q_GUI_EXPORT QSize qSmartMinSize(const QWidgetItem *i);

   106 Q_GUI_EXPORT QSize qSmartMinSize(const QWidget *w);

   107 Q_GUI_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,

   108                                  const QSize &minSize, const QSize &maxSize,

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

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

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

   112 

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

   114 

   115 /*

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

   117   when adding boxmax/boxexp.

   118 

   119   Expansive boxes win over non-expansive boxes.

   120   Non-empty boxes win over empty boxes.

   121 */

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

   123                                int boxmax, bool boxexp, bool boxempty)

   124 {

   125     if (exp) {

   126         if (boxexp)

   127             max = qMax(max, boxmax);

   128     } else {

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

   130             max = boxmax;

   131         else if (empty == boxempty)

   132             max = qMin(max, boxmax);

   133     }

   134     exp = exp || boxexp;

   135     empty = empty && boxempty;

   136 }

   137 

   138 QT_END_NAMESPACE

   139 

   140 #endif // QLAYOUTENGINE_P_H