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-/****************************************************************************
-**
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
-** 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 Digia. For licensing terms and
-** conditions see http://qt.digia.com/licensing. For further information
-** use the contact form at http://qt.digia.com/contact-us.
-**
-** GNU Free Documentation License Usage
-** Alternatively, this file may be used under the terms of the GNU Free
-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file. Please review the following information to ensure
-** the GNU Free Documentation License version 1.3 requirements
-** will be met: http://www.gnu.org/copyleft/fdl.html.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
- \class QSizePolicy
- \brief The QSizePolicy class is a layout attribute describing horizontal
- and vertical resizing policy.
-
- \ingroup geomanagement
- \inmodule QtWidgets
-
- The size policy of a widget is an expression of its willingness to
- be resized in various ways, and affects how the widget is treated
- by the \l{Layout Management}{layout engine}. Each widget returns a
- QSizePolicy that describes the horizontal and vertical resizing
- policy it prefers when being laid out. You can change this for
- a specific widget by changing its QWidget::sizePolicy property.
-
- QSizePolicy contains two independent QSizePolicy::Policy values
- and two stretch factors; one describes the widgets's horizontal
- size policy, and the other describes its vertical size policy. It
- also contains a flag to indicate whether the height and width of
- its preferred size are related.
-
- The horizontal and vertical policies can be set in the
- constructor, and altered using the setHorizontalPolicy() and
- setVerticalPolicy() functions. The stretch factors can be set
- using the setHorizontalStretch() and setVerticalStretch()
- functions. The flag indicating whether the widget's
- \l{QWidget::sizeHint()}{sizeHint()} is width-dependent (such as a
- menu bar or a word-wrapping label) can be set using the
- setHeightForWidth() function.
-
- The current size policies and stretch factors be retrieved using
- the horizontalPolicy(), verticalPolicy(), horizontalStretch() and
- verticalStretch() functions. Alternatively, use the transpose()
- function to swap the horizontal and vertical policies and
- stretches. The hasHeightForWidth() function returns the current
- status of the flag indicating the size hint dependencies.
-
- Use the expandingDirections() function to determine whether the
- associated widget can make use of more space than its
- \l{QWidget::sizeHint()}{sizeHint()} function indicates, as well as
- find out in which directions it can expand.
-
- Finally, the QSizePolicy class provides operators comparing this
- size policy to a given policy, as well as a QVariant operator
- storing this QSizePolicy as a QVariant object.
-
- \sa QSize, QWidget::sizeHint(), QWidget::sizePolicy,
- QLayoutItem::sizeHint()
-*/
-
-/*!
- \enum QSizePolicy::PolicyFlag
-
- These flags are combined together to form the various \l{Policy}
- values:
-
- \value GrowFlag The widget can grow beyond its size hint if necessary.
- \value ExpandFlag The widget should get as much space as possible.
- \value ShrinkFlag The widget can shrink below its size hint if necessary.
- \value IgnoreFlag The widget's size hint is ignored. The widget will get
- as much space as possible.
-
- \sa Policy
-*/
-
-/*!
- \enum QSizePolicy::Policy
-
- This enum describes the various per-dimension sizing types used
- when constructing a QSizePolicy.
-
- \value Fixed The QWidget::sizeHint() is the only acceptable
- alternative, so the widget can never grow or shrink (e.g. the
- vertical direction of a push button).
-
- \value Minimum The sizeHint() is minimal, and sufficient. The
- widget can be expanded, but there is no advantage to it being
- larger (e.g. the horizontal direction of a push button).
- It cannot be smaller than the size provided by sizeHint().
-
- \value Maximum The sizeHint() is a maximum. The widget can be
- shrunk any amount without detriment if other widgets need the
- space (e.g. a separator line).
- It cannot be larger than the size provided by sizeHint().
-
- \value Preferred The sizeHint() is best, but the widget can be
- shrunk and still be useful. The widget can be expanded, but there
- is no advantage to it being larger than sizeHint() (the default
- QWidget policy).
-
- \value Expanding The sizeHint() is a sensible size, but the
- widget can be shrunk and still be useful. The widget can make use
- of extra space, so it should get as much space as possible (e.g.
- the horizontal direction of a horizontal slider).
-
- \value MinimumExpanding The sizeHint() is minimal, and sufficient.
- The widget can make use of extra space, so it should get as much
- space as possible (e.g. the horizontal direction of a horizontal
- slider).
-
- \value Ignored The sizeHint() is ignored. The widget will get as
- much space as possible.
-
- \sa PolicyFlag, setHorizontalPolicy(), setVerticalPolicy()
-*/
-
-/*!
- \fn QSizePolicy::QSizePolicy()
-
- Constructs a QSizePolicy object with \l Fixed as its horizontal
- and vertical policies.
-
- The policies can be altered using the setHorizontalPolicy() and
- setVerticalPolicy() functions. Use the setHeightForWidth()
- function if the preferred height of the widget is dependent on the
- width of the widget (for example, a QLabel with line wrapping).
-
- \sa setHorizontalStretch(), setVerticalStretch()
-*/
-
-/*!
- \fn QSizePolicy::QSizePolicy(Policy horizontal, Policy vertical, ControlType type)
- \since 4.3
-
- Constructs a QSizePolicy object with the given \a horizontal and
- \a vertical policies, and the specified control \a type.
-
- Use setHeightForWidth() if the preferred height of the widget is
- dependent on the width of the widget (for example, a QLabel with
- line wrapping).
-
- \sa setHorizontalStretch(), setVerticalStretch(), controlType()
-*/
-
-/*!
- \fn QSizePolicy::Policy QSizePolicy::horizontalPolicy() const
-
- Returns the horizontal component of the size policy.
-
- \sa setHorizontalPolicy(), verticalPolicy(), horizontalStretch()
-*/
-
-/*!
- \fn QSizePolicy::Policy QSizePolicy::verticalPolicy() const
-
- Returns the vertical component of the size policy.
-
- \sa setVerticalPolicy(), horizontalPolicy(), verticalStretch()
-*/
-
-/*!
- \fn void QSizePolicy::setHorizontalPolicy(Policy policy)
-
- Sets the horizontal component to the given \a policy.
-
- \sa horizontalPolicy(), setVerticalPolicy(), setHorizontalStretch()
-*/
-
-/*!
- \fn void QSizePolicy::setVerticalPolicy(Policy policy)
-
- Sets the vertical component to the given \a policy.
-
- \sa verticalPolicy(), setHorizontalPolicy(), setVerticalStretch()
-*/
-
-/*!
- \fn Qt::Orientations QSizePolicy::expandingDirections() const
-
- Returns whether a widget can make use of more space than the
- QWidget::sizeHint() function indicates.
-
- A value of Qt::Horizontal or Qt::Vertical means that the widget
- can grow horizontally or vertically (i.e., the horizontal or
- vertical policy is \l Expanding or \l MinimumExpanding), whereas
- Qt::Horizontal | Qt::Vertical means that it can grow in both
- dimensions.
-
- \sa horizontalPolicy(), verticalPolicy()
-*/
-
-/*!
- \fn ControlType QSizePolicy::controlType() const
- \since 4.3
-
- Returns the control type associated with the widget for which
- this size policy applies.
-*/
-
-/*!
- \fn void QSizePolicy::setControlType(ControlType type)
- \since 4.3
-
- Sets the control type associated with the widget for which this
- size policy applies to \a type.
-
- The control type specifies the type of the widget for which this
- size policy applies. It is used by some styles, notably
- QMacStyle, to insert proper spacing between widgets. For example,
- the Mac OS X Aqua guidelines specify that push buttons should be
- separated by 12 pixels, whereas vertically stacked radio buttons
- only require 6 pixels.
-
- \sa QStyle::layoutSpacing()
-*/
-
-/*!
- \fn void QSizePolicy::setHeightForWidth(bool dependent)
-
- Sets the flag determining whether the widget's preferred height
- depends on its width, to \a dependent.
-
- \sa hasHeightForWidth(), setWidthForHeight()
-*/
-
-/*!
- \fn bool QSizePolicy::hasHeightForWidth() const
-
- Returns \c true if the widget's preferred height depends on its
- width; otherwise returns \c false.
-
- \sa setHeightForWidth()
-*/
-
-/*!
- \fn void QSizePolicy::setWidthForHeight(bool dependent)
-
- Sets the flag determining whether the widget's width
- depends on its height, to \a dependent.
-
- This is only supported for QGraphicsLayout's subclasses.
- It is not possible to have a layout with both height-for-width
- and width-for-height constraints at the same time.
-
- \sa hasWidthForHeight(), setHeightForWidth()
-*/
-
-/*!
- \fn bool QSizePolicy::hasWidthForHeight() const
-
- Returns \c true if the widget's width depends on its
- height; otherwise returns \c false.
-
- \sa setWidthForHeight()
-*/
-
-/*!
- \fn bool QSizePolicy::operator==(const QSizePolicy &other) const
-
- Returns \c true if this policy is equal to \a other; otherwise
- returns \c false.
-
- \sa operator!=()
-*/
-
-/*!
- \fn bool QSizePolicy::operator!=(const QSizePolicy &other) const
-
- Returns \c true if this policy is different from \a other; otherwise
- returns \c false.
-
- \sa operator==()
-*/
-
-/*!
- \fn int QSizePolicy::horizontalStretch() const
-
- Returns the horizontal stretch factor of the size policy.
-
- \sa setHorizontalStretch(), verticalStretch(), horizontalPolicy()
-*/
-
-/*!
- \fn int QSizePolicy::verticalStretch() const
-
- Returns the vertical stretch factor of the size policy.
-
- \sa setVerticalStretch(), horizontalStretch(), verticalPolicy()
-*/
-
-/*!
- \fn void QSizePolicy::setHorizontalStretch(int stretchFactor)
-
- Sets the horizontal stretch factor of the size policy to the given \a
- stretchFactor. \a stretchFactor must be in the range [0,255].
-
- When two widgets are adjacent to each other in a horizontal layout,
- setting the horizontal stretch factor of the widget on the left to 2
- and the factor of widget on the right to 1 will ensure that the widget
- on the left will always be twice the size of the one on the right.
-
- \sa horizontalStretch(), setVerticalStretch(), setHorizontalPolicy()
-*/
-
-/*!
- \fn void QSizePolicy::setVerticalStretch(int stretchFactor)
-
- Sets the vertical stretch factor of the size policy to the given
- \a stretchFactor. \a stretchFactor must be in the range [0,255].
-
- When two widgets are adjacent to each other in a vertical layout,
- setting the vertical stretch factor of the widget on the top to 2
- and the factor of widget on the bottom to 1 will ensure that
- the widget on the top will always be twice the size of the one
- on the bottom.
-
- \sa verticalStretch(), setHorizontalStretch(), setVerticalPolicy()
-*/
-
-/*!
- \fn void QSizePolicy::transpose()
-
- Swaps the horizontal and vertical policies and stretches.
-*/
-
-/*!
- \fn void QSizePolicy::retainSizeWhenHidden() const
- \since 5.2
-
- Returns if the layout should retain the widgets size when it is hidden. This is by default false.
-
- \sa setRetainSizeWhenHidden()
-*/
-
-/*!
- \fn void QSizePolicy::setRetainSizeWhenHidden(bool retainSize)
- \since 5.2
-
- Set if a layout should retain the widgets size when it is hidden.
- If \a retainSize is true the layout will not be changed by hiding the widget.
-
- \sa retainSizeWhenHidden()
-*/
-
-/*!
- \enum QSizePolicy::ControlType
- \since 4.3
-
- This enum specifies the different types of widgets in terms of
- layout interaction:
-
- \value DefaultType The default type, when none is specified.
- \value ButtonBox A QDialogButtonBox instance.
- \value CheckBox A QCheckBox instance.
- \value ComboBox A QComboBox instance.
- \value Frame A QFrame instance.
- \value GroupBox A QGroupBox instance.
- \value Label A QLabel instance.
- \value Line A QFrame instance with QFrame::HLine or QFrame::VLine.
- \value LineEdit A QLineEdit instance.
- \value PushButton A QPushButton instance.
- \value RadioButton A QRadioButton instance.
- \value Slider A QAbstractSlider instance.
- \value SpinBox A QAbstractSpinBox instance.
- \value TabWidget A QTabWidget instance.
- \value ToolButton A QToolButton instance.
-
- \sa setControlType(), controlType()
-*/
-