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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSIZEPOLICY_H
#define QSIZEPOLICY_H
#include <QtWidgets/qtwidgetsglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qalgorithms.h>
QT_BEGIN_NAMESPACE
class QVariant;
class QSizePolicy;
Q_DECL_CONST_FUNCTION inline size_t qHash(QSizePolicy key, size_t seed = 0) noexcept;
class Q_WIDGETS_EXPORT QSizePolicy
{
Q_GADGET
public:
enum PolicyFlag {
GrowFlag = 1,
ExpandFlag = 2,
ShrinkFlag = 4,
IgnoreFlag = 8
};
enum Policy {
Fixed = 0,
Minimum = GrowFlag,
Maximum = ShrinkFlag,
Preferred = GrowFlag | ShrinkFlag,
MinimumExpanding = GrowFlag | ExpandFlag,
Expanding = GrowFlag | ShrinkFlag | ExpandFlag,
Ignored = ShrinkFlag | GrowFlag | IgnoreFlag
};
Q_ENUM(Policy)
enum ControlType {
DefaultType = 0x00000001,
ButtonBox = 0x00000002,
CheckBox = 0x00000004,
ComboBox = 0x00000008,
Frame = 0x00000010,
GroupBox = 0x00000020,
Label = 0x00000040,
Line = 0x00000080,
LineEdit = 0x00000100,
PushButton = 0x00000200,
RadioButton = 0x00000400,
Slider = 0x00000800,
SpinBox = 0x00001000,
TabWidget = 0x00002000,
ToolButton = 0x00004000
};
Q_DECLARE_FLAGS(ControlTypes, ControlType)
Q_FLAG(ControlTypes)
constexpr QSizePolicy() noexcept : data(0) { }
constexpr QSizePolicy(Policy horizontal, Policy vertical, ControlType type = DefaultType) noexcept
: bits{0, 0, quint32(horizontal), quint32(vertical),
type == DefaultType ? 0 : toControlTypeFieldValue(type), 0, 0, 0}
{}
constexpr Policy horizontalPolicy() const noexcept { return static_cast<Policy>(bits.horPolicy); }
constexpr Policy verticalPolicy() const noexcept { return static_cast<Policy>(bits.verPolicy); }
ControlType controlType() const noexcept;
constexpr void setHorizontalPolicy(Policy d) noexcept { bits.horPolicy = d; }
constexpr void setVerticalPolicy(Policy d) noexcept { bits.verPolicy = d; }
void setControlType(ControlType type) noexcept;
constexpr Qt::Orientations expandingDirections() const noexcept {
return ( (verticalPolicy() & int(ExpandFlag)) ? Qt::Vertical : Qt::Orientations() )
| ( (horizontalPolicy() & int(ExpandFlag)) ? Qt::Horizontal : Qt::Orientations() ) ;
}
constexpr void setHeightForWidth(bool b) noexcept { bits.hfw = b; }
constexpr bool hasHeightForWidth() const noexcept { return bits.hfw; }
constexpr void setWidthForHeight(bool b) noexcept { bits.wfh = b; }
constexpr bool hasWidthForHeight() const noexcept { return bits.wfh; }
constexpr bool operator==(const QSizePolicy& s) const noexcept { return data == s.data; }
constexpr bool operator!=(const QSizePolicy& s) const noexcept { return data != s.data; }
friend Q_DECL_CONST_FUNCTION size_t qHash(QSizePolicy key, size_t seed) noexcept { return qHash(key.data, seed); }
operator QVariant() const;
constexpr int horizontalStretch() const noexcept { return static_cast<int>(bits.horStretch); }
constexpr int verticalStretch() const noexcept { return static_cast<int>(bits.verStretch); }
constexpr void setHorizontalStretch(int stretchFactor) { bits.horStretch = static_cast<quint32>(qBound(0, stretchFactor, 255)); }
constexpr void setVerticalStretch(int stretchFactor) { bits.verStretch = static_cast<quint32>(qBound(0, stretchFactor, 255)); }
constexpr bool retainSizeWhenHidden() const noexcept { return bits.retainSizeWhenHidden; }
constexpr void setRetainSizeWhenHidden(bool retainSize) noexcept { bits.retainSizeWhenHidden = retainSize; }
constexpr void transpose() noexcept { *this = transposed(); }
[[nodiscard]] constexpr QSizePolicy transposed() const noexcept
{
return QSizePolicy(bits.transposed());
}
private:
#ifndef QT_NO_DATASTREAM
friend Q_WIDGETS_EXPORT QDataStream &operator<<(QDataStream &, const QSizePolicy &);
friend Q_WIDGETS_EXPORT QDataStream &operator>>(QDataStream &, QSizePolicy &);
#endif
constexpr QSizePolicy(int i) noexcept : data(i) { }
struct Bits;
constexpr explicit QSizePolicy(Bits b) noexcept : bits(b) { }
static constexpr quint32 toControlTypeFieldValue(ControlType type) noexcept
{
/*
The control type is a flag type, with values 0x1, 0x2, 0x4, 0x8, 0x10,
etc. In memory, we pack it onto the available bits (CTSize) in
setControlType(), and unpack it here.
Example:
0x00000001 maps to 0
0x00000002 maps to 1
0x00000004 maps to 2
0x00000008 maps to 3
etc.
*/
return qCountTrailingZeroBits(static_cast<quint32>(type));
}
struct Bits {
quint32 horStretch : 8;
quint32 verStretch : 8;
quint32 horPolicy : 4;
quint32 verPolicy : 4;
quint32 ctype : 5;
quint32 hfw : 1;
quint32 wfh : 1;
quint32 retainSizeWhenHidden : 1;
constexpr Bits transposed() const noexcept
{
return {verStretch, // \ swap
horStretch, // /
verPolicy, // \ swap
horPolicy, // /
ctype,
hfw, // \ don't swap (historic behavior)
wfh, // /
retainSizeWhenHidden};
}
};
union {
Bits bits;
quint32 data;
};
};
Q_DECLARE_TYPEINFO(QSizePolicy, Q_PRIMITIVE_TYPE);
Q_DECLARE_OPERATORS_FOR_FLAGS(QSizePolicy::ControlTypes)
#ifndef QT_NO_DATASTREAM
Q_WIDGETS_EXPORT QDataStream &operator<<(QDataStream &, const QSizePolicy &);
Q_WIDGETS_EXPORT QDataStream &operator>>(QDataStream &, QSizePolicy &);
#endif
#ifndef QT_NO_DEBUG_STREAM
Q_WIDGETS_EXPORT QDebug operator<<(QDebug dbg, const QSizePolicy &);
#endif
QT_END_NAMESPACE
#endif // QSIZEPOLICY_H
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