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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#include <QtCore/qcontainerfwd.h>
58
59QT_BEGIN_NAMESPACE
60
61struct QLayoutStruct
62{
63 inline void init(int stretchFactor = 0, int minSize = 0) {
64 stretch = stretchFactor;
65 minimumSize = sizeHint = minSize;
66 maximumSize = QLAYOUTSIZE_MAX;
67 expansive = false;
68 empty = true;
69 spacing = 0;
70 }
71
72 int smartSizeHint() {
73 return (stretch > 0) ? minimumSize : sizeHint;
74 }
75 int effectiveSpacer(int uniformSpacer) const {
76 Q_ASSERT(uniformSpacer >= 0 || spacing >= 0);
77 return (uniformSpacer >= 0) ? uniformSpacer : spacing;
78 }
79
80 // parameters
81 int stretch;
82 int sizeHint;
83 int maximumSize;
84 int minimumSize;
85 int spacing;
86 bool expansive;
87 bool empty;
88
89 // temporary storage
90 bool done;
91
92 // result
93 int pos;
94 int size;
95};
96
97Q_WIDGETS_EXPORT void qGeomCalc(QList<QLayoutStruct> &chain, int start, int count, int pos,
98 int space, int spacer = -1);
99Q_WIDGETS_EXPORT QSize qSmartMinSize(const QSize &sizeHint, const QSize &minSizeHint,
100 const QSize &minSize, const QSize &maxSize,
101 const QSizePolicy &sizePolicy);
102Q_WIDGETS_EXPORT QSize qSmartMinSize(const QWidgetItem *i);
103Q_WIDGETS_EXPORT QSize qSmartMinSize(const QWidget *w);
104Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,
105 const QSize &minSize, const QSize &maxSize,
106 const QSizePolicy &sizePolicy, Qt::Alignment align = { });
107Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = { });
108Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = { });
109
110Q_WIDGETS_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm);
111
112/*
113 Modify total maximum (max), total expansion (exp), and total empty
114 when adding boxmax/boxexp.
115
116 Expansive boxes win over non-expansive boxes.
117 Non-empty boxes win over empty boxes.
118*/
119static inline void qMaxExpCalc(int & max, bool &exp, bool &empty,
120 int boxmax, bool boxexp, bool boxempty)
121{
122 if (exp) {
123 if (boxexp)
124 max = qMax(max, boxmax);
125 } else {
126 if (boxexp || (empty && (!boxempty || max == 0)))
127 max = boxmax;
128 else if (empty == boxempty)
129 max = qMin(max, boxmax);
130 }
131 exp = exp || boxexp;
132 empty = empty && boxempty;
133}
134
135QT_END_NAMESPACE
136
137#endif // QLAYOUTENGINE_P_H
138