Qt 4.8
qlayoutengine_p.h
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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 
60 
61 template <typename T> class QVector;
62 
64 {
65  inline void init(int stretchFactor = 0, int minSize = 0) {
66  stretch = stretchFactor;
67  minimumSize = sizeHint = minSize;
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;
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);
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 
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 
139 
140 #endif // QLAYOUTENGINE_P_H
Q_DECL_CONSTEXPR const T & qMin(const T &a, const T &b)
Definition: qglobal.h:1215
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
void init(int stretchFactor=0, int minSize=0)
#define Q_GUI_EXPORT
Definition: qglobal.h:1450
The QWidget class is the base class of all user interface objects.
Definition: qwidget.h:150
PixelMetric
This enum describes the various available pixel metrics.
Definition: qstyle.h:474
#define Q_ASSERT(cond)
Definition: qglobal.h:1823
The QVector class is a template class that provides a dynamic array.
Definition: qdatastream.h:64
int effectiveSpacer(int uniformSpacer) const
Q_DECL_CONSTEXPR const T & qMax(const T &a, const T &b)
Definition: qglobal.h:1217
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
The QLayout class is the base class of geometry managers.
Definition: qlayout.h:90
const char * layout
The QWidgetItem class is a layout item that represents a widget.
Definition: qlayoutitem.h:122
Q_GUI_EXPORT QSize qSmartMinSize(const QSize &sizeHint, const QSize &minSizeHint, const QSize &minSize, const QSize &maxSize, const QSizePolicy &sizePolicy)
Q_GUI_EXPORT QSize qSmartMaxSize(const QSize &sizeHint, const QSize &minSize, const QSize &maxSize, const QSizePolicy &sizePolicy, Qt::Alignment align=0)
Q_GUI_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm)
The QSize class defines the size of a two-dimensional object using integer point precision.
Definition: qsize.h:53
static const int QLAYOUTSIZE_MAX
Definition: qlayoutitem.h:56
static void qMaxExpCalc(int &max, bool &exp, bool &empty, int boxmax, bool boxexp, bool boxempty)
Q_GUI_EXPORT void qGeomCalc(QVector< QLayoutStruct > &chain, int start, int count, int pos, int space, int spacer=-1)