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39
40#ifndef QLAYOUTPOLICY_H
41#define QLAYOUTPOLICY_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 <QtGui/private/qtguiglobal_p.h>
55#include <QtCore/qobject.h>
56#include <QtCore/qnamespace.h>
57
58#ifndef QT_NO_DATASTREAM
59# include <QtCore/qdatastream.h>
60#endif
61
62QT_BEGIN_NAMESPACE
63
64
65class QVariant;
66
67class Q_GUI_EXPORT QLayoutPolicy
68{
69 Q_GADGET
70 Q_ENUMS(Policy)
71
72public:
73 enum PolicyFlag {
74 GrowFlag = 1,
75 ExpandFlag = 2,
76 ShrinkFlag = 4,
77 IgnoreFlag = 8
78 };
79
80 enum Policy {
81 Fixed = 0,
82 Minimum = GrowFlag,
83 Maximum = ShrinkFlag,
84 Preferred = GrowFlag | ShrinkFlag,
85 MinimumExpanding = GrowFlag | ExpandFlag,
86 Expanding = GrowFlag | ShrinkFlag | ExpandFlag,
87 Ignored = ShrinkFlag | GrowFlag | IgnoreFlag
88 };
89
90 enum ControlType {
91 DefaultType = 0x00000001,
92 ButtonBox = 0x00000002,
93 CheckBox = 0x00000004,
94 ComboBox = 0x00000008,
95 Frame = 0x00000010,
96 GroupBox = 0x00000020,
97 Label = 0x00000040,
98 Line = 0x00000080,
99 LineEdit = 0x00000100,
100 PushButton = 0x00000200,
101 RadioButton = 0x00000400,
102 Slider = 0x00000800,
103 SpinBox = 0x00001000,
104 TabWidget = 0x00002000,
105 ToolButton = 0x00004000
106 };
107 Q_DECLARE_FLAGS(ControlTypes, ControlType)
108
109 QLayoutPolicy() : data(0) { }
110
111 QLayoutPolicy(Policy horizontal, Policy vertical, ControlType type = DefaultType)
112 : data(0) {
113 bits.horPolicy = horizontal;
114 bits.verPolicy = vertical;
115 setControlType(type);
116 }
117 Policy horizontalPolicy() const { return static_cast<Policy>(bits.horPolicy); }
118 Policy verticalPolicy() const { return static_cast<Policy>(bits.verPolicy); }
119 ControlType controlType() const;
120
121 void setHorizontalPolicy(Policy d) { bits.horPolicy = d; }
122 void setVerticalPolicy(Policy d) { bits.verPolicy = d; }
123 void setControlType(ControlType type);
124
125 Qt::Orientations expandingDirections() const {
126 Qt::Orientations result;
127 if (verticalPolicy() & ExpandFlag)
128 result |= Qt::Vertical;
129 if (horizontalPolicy() & ExpandFlag)
130 result |= Qt::Horizontal;
131 return result;
132 }
133
134 void setHeightForWidth(bool b) { bits.hfw = b; }
135 bool hasHeightForWidth() const { return bits.hfw; }
136 void setWidthForHeight(bool b) { bits.wfh = b; }
137 bool hasWidthForHeight() const { return bits.wfh; }
138
139 bool operator==(const QLayoutPolicy& s) const { return data == s.data; }
140 bool operator!=(const QLayoutPolicy& s) const { return data != s.data; }
141
142 int horizontalStretch() const { return static_cast<int>(bits.horStretch); }
143 int verticalStretch() const { return static_cast<int>(bits.verStretch); }
144 void setHorizontalStretch(int stretchFactor) { bits.horStretch = static_cast<quint32>(qBound(min: 0, val: stretchFactor, max: 255)); }
145 void setVerticalStretch(int stretchFactor) { bits.verStretch = static_cast<quint32>(qBound(min: 0, val: stretchFactor, max: 255)); }
146
147 void transpose();
148
149
150private:
151#ifndef QT_NO_DATASTREAM
152 friend QDataStream &operator<<(QDataStream &, const QLayoutPolicy &);
153 friend QDataStream &operator>>(QDataStream &, QLayoutPolicy &);
154#endif
155 QLayoutPolicy(int i) : data(i) { }
156
157 union {
158 struct {
159 quint32 horStretch : 8;
160 quint32 verStretch : 8;
161 quint32 horPolicy : 4;
162 quint32 verPolicy : 4;
163 quint32 ctype : 5;
164 quint32 hfw : 1;
165 quint32 wfh : 1;
166 quint32 padding : 1; // feel free to use
167 } bits;
168 quint32 data;
169 };
170};
171
172Q_DECLARE_OPERATORS_FOR_FLAGS(QLayoutPolicy::ControlTypes)
173
174#ifndef QT_NO_DATASTREAM
175QDataStream &operator<<(QDataStream &, const QLayoutPolicy &);
176QDataStream &operator>>(QDataStream &, QLayoutPolicy &);
177#endif
178
179#ifndef QT_NO_DEBUG_STREAM
180QDebug operator<<(QDebug dbg, const QLayoutPolicy &);
181#endif
182
183inline void QLayoutPolicy::transpose() {
184 Policy hData = horizontalPolicy();
185 Policy vData = verticalPolicy();
186 int hStretch = horizontalStretch();
187 int vStretch = verticalStretch();
188 setHorizontalPolicy(vData);
189 setVerticalPolicy(hData);
190 setHorizontalStretch(vStretch);
191 setVerticalStretch(hStretch);
192}
193
194QT_END_NAMESPACE
195
196#endif // QLAYOUTPOLICY_H
197

source code of qtbase/src/gui/util/qlayoutpolicy_p.h