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39
40 #ifndef QLAYOUTENGINE_P_H
41 #define QLAYOUTENGINE_P_H
42
43 //
44 // W A R N I N G
45 // -------------
46 //
47 // This file is not part of the Qt API. It exists purely as an
48 // implementation detail. This header file may change from version to
49 // version without notice, or even be removed.
50 //
51 // We mean it.
52 //
53
54 #include <QtWidgets/private/qtwidgetsglobal_p.h>
55 #include "QtWidgets/qlayoutitem.h"
56 #include "QtWidgets/qstyle.h"
57
58 QT_BEGIN_NAMESPACE
59
60 template <typename T> class QVector;
61
62 struct QLayoutStruct
63 {
64 inline void init(int stretchFactor = 0, int minSize = 0) {
65 stretch = stretchFactor;
66 minimumSize = sizeHint = minSize;
67 maximumSize = QLAYOUTSIZE_MAX;
68 expansive = false;
69 empty = true;
70 spacing = 0;
71 }
72
smartSizeHintQLayoutStruct73 int smartSizeHint() {
74 return (stretch > 0) ? minimumSize : sizeHint;
75 }
effectiveSpacerQLayoutStruct76 int effectiveSpacer(int uniformSpacer) const {
77 Q_ASSERT(uniformSpacer >= 0 || spacing >= 0);
78 return (uniformSpacer >= 0) ? uniformSpacer : spacing;
79 }
80
81 // parameters
82 int stretch;
83 int sizeHint;
84 int maximumSize;
85 int minimumSize;
86 int spacing;
87 bool expansive;
88 bool empty;
89
90 // temporary storage
91 bool done;
92
93 // result
94 int pos;
95 int size;
96 };
97
98
99 Q_WIDGETS_EXPORT void qGeomCalc(QVector<QLayoutStruct> &chain, int start, int count,
100 int pos, int space, int spacer = -1);
101 Q_WIDGETS_EXPORT QSize qSmartMinSize(const QSize &sizeHint, const QSize &minSizeHint,
102 const QSize &minSize, const QSize &maxSize,
103 const QSizePolicy &sizePolicy);
104 Q_WIDGETS_EXPORT QSize qSmartMinSize(const QWidgetItem *i);
105 Q_WIDGETS_EXPORT QSize qSmartMinSize(const QWidget *w);
106 Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,
107 const QSize &minSize, const QSize &maxSize,
108 const QSizePolicy &sizePolicy, Qt::Alignment align = { });
109 Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = { });
110 Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = { });
111
112 Q_WIDGETS_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm);
113
114 /*
115 Modify total maximum (max), total expansion (exp), and total empty
116 when adding boxmax/boxexp.
117
118 Expansive boxes win over non-expansive boxes.
119 Non-empty boxes win over empty boxes.
120 */
qMaxExpCalc(int & max,bool & exp,bool & empty,int boxmax,bool boxexp,bool boxempty)121 static inline void qMaxExpCalc(int & max, bool &exp, bool &empty,
122 int boxmax, bool boxexp, bool boxempty)
123 {
124 if (exp) {
125 if (boxexp)
126 max = qMax(max, boxmax);
127 } else {
128 if (boxexp || (empty && (!boxempty || max == 0)))
129 max = boxmax;
130 else if (empty == boxempty)
131 max = qMin(max, boxmax);
132 }
133 exp = exp || boxexp;
134 empty = empty && boxempty;
135 }
136
137 QT_END_NAMESPACE
138
139 #endif // QLAYOUTENGINE_P_H
140