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292 lines
16 KiB
292 lines
16 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qabstractlayout.cpp:1240 -->
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<title>QSizePolicy Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSizePolicy Class Reference</h1>
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<p>The QSizePolicy class is a layout attribute describing horizontal
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and vertical resizing policy.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsizepolicy-h.html">qsizepolicy.h</a>></tt>
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<p><a href="qsizepolicy-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>enum <a href="#SizeType-enum"><b>SizeType</b></a> { Fixed = 0, Minimum = MayGrow, Maximum = MayShrink, Preferred = MayGrow | MayShrink, MinimumExpanding = MayGrow | ExpMask, Expanding = MayGrow | MayShrink | ExpMask, Ignored = ExpMask }</li>
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<li class=fn>enum <a href="#ExpandData-enum"><b>ExpandData</b></a> { NoDirection = 0, Horizontally = 1, Vertically = 2, Horizontal = Horizontally, Vertical = Vertically, BothDirections = Horizontally | Vertically }</li>
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<li class=fn><a href="#QSizePolicy"><b>QSizePolicy</b></a> ()</li>
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<li class=fn><a href="#QSizePolicy-2"><b>QSizePolicy</b></a> ( SizeType hor, SizeType ver, bool hfw = FALSE )</li>
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<li class=fn><a href="#QSizePolicy-3"><b>QSizePolicy</b></a> ( SizeType hor, SizeType ver, uchar horStretch, uchar verStretch, bool hfw = FALSE )</li>
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<li class=fn>SizeType <a href="#horData"><b>horData</b></a> () const</li>
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<li class=fn>SizeType <a href="#verData"><b>verData</b></a> () const</li>
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<li class=fn>bool <a href="#mayShrinkHorizontally"><b>mayShrinkHorizontally</b></a> () const</li>
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<li class=fn>bool <a href="#mayShrinkVertically"><b>mayShrinkVertically</b></a> () const</li>
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<li class=fn>bool <a href="#mayGrowHorizontally"><b>mayGrowHorizontally</b></a> () const</li>
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<li class=fn>bool <a href="#mayGrowVertically"><b>mayGrowVertically</b></a> () const</li>
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<li class=fn>ExpandData <a href="#expanding"><b>expanding</b></a> () const</li>
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<li class=fn>void <a href="#setHorData"><b>setHorData</b></a> ( SizeType d )</li>
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<li class=fn>void <a href="#setVerData"><b>setVerData</b></a> ( SizeType d )</li>
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<li class=fn>void <a href="#setHeightForWidth"><b>setHeightForWidth</b></a> ( bool b )</li>
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<li class=fn>bool <a href="#hasHeightForWidth"><b>hasHeightForWidth</b></a> () const</li>
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<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QSizePolicy & s ) const</li>
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<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QSizePolicy & s ) const</li>
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<li class=fn>uint <a href="#horStretch"><b>horStretch</b></a> () const</li>
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<li class=fn>uint <a href="#verStretch"><b>verStretch</b></a> () const</li>
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<li class=fn>void <a href="#setHorStretch"><b>setHorStretch</b></a> ( uchar sf )</li>
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<li class=fn>void <a href="#setVerStretch"><b>setVerStretch</b></a> ( uchar sf )</li>
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<li class=fn>void <a href="#transpose"><b>transpose</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QSizePolicy class is a layout attribute describing horizontal
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and vertical resizing policy.
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<p>
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<p> The size policy of a widget is an expression of its willingness to
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be resized in various ways.
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<p> Widgets that reimplement <a href="qwidget.html#sizePolicy">QWidget::sizePolicy</a>() return a QSizePolicy
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that describes the horizontal and vertical resizing policy they
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prefer when being laid out. Only <a href="#interesting">one of the
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constructors</a> is of interest in most applications.
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<p> QSizePolicy contains two independent SizeType objects; one describes
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the widgets's horizontal size policy, and the other describes its
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vertical size policy. It also contains a flag to indicate whether the
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height and width of its preferred size are related.
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<p> The horizontal and vertical <a href="#SizeType-enum">SizeType</a>s are set in the usual constructor
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and can be queried using a variety of functions.
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<p> The <a href="#hasHeightForWidth">hasHeightForWidth</a>() flag indicates whether the widget's sizeHint()
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is width-dependent (such as a word-wrapping label) or not.
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<p> <p>See also <a href="#SizeType-enum">QSizePolicy::SizeType</a>, <a href="appearance.html">Widget Appearance and Style</a>, and <a href="geomanagement.html">Layout Management</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="ExpandData-enum"></a>QSizePolicy::ExpandData</h3>
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<p> This enum type describes in which directions a widget can make use
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of extra space. There are four possible values:
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<ul>
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<li><tt>QSizePolicy::NoDirection</tt> - the widget cannot make use of extra space in
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any direction.
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<li><tt>QSizePolicy::Horizontally</tt> - the widget can usefully be wider than the
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sizeHint().
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<li><tt>QSizePolicy::Vertically</tt> - the widget can usefully be taller than the
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sizeHint().
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<li><tt>QSizePolicy::BothDirections</tt> - the widget can usefully be both wider and
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taller than the sizeHint().
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</ul>
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<h3 class=fn><a name="SizeType-enum"></a>QSizePolicy::SizeType</h3>
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<p> The per-dimension sizing types used when constructing a
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QSizePolicy are:
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<ul>
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<li><tt>QSizePolicy::Fixed</tt> - The <a href="qwidget.html#sizeHint">QWidget::sizeHint</a>() is the only acceptable
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alternative, so the widget can never grow or shrink (e.g. the
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vertical direction of a push button).
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<li><tt>QSizePolicy::Minimum</tt> - The sizeHint() is minimal, and sufficient. The
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widget can be expanded, but there is no advantage to it being
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larger (e.g. the horizontal direction of a push button).
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It cannot be smaller than the size provided by sizeHint().
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<li><tt>QSizePolicy::Maximum</tt> - The sizeHint() is a maximum. The widget can be
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shrunk any amount without detriment if other widgets need the
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space (e.g. a separator line).
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It cannot be larger than the size provided by sizeHint().
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<li><tt>QSizePolicy::Preferred</tt> - The sizeHint() is best, but the widget can be
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shrunk and still be useful. The widget can be expanded, but there
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is no advantage to it being larger than sizeHint() (the default
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<a href="qwidget.html">QWidget</a> policy).
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<li><tt>QSizePolicy::Expanding</tt> - The sizeHint() is a sensible size, but the
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widget can be shrunk and still be useful. The widget can make use
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of extra space, so it should get as much space as possible (e.g.
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the horizontal direction of a slider).
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<li><tt>QSizePolicy::MinimumExpanding</tt> - The sizeHint() is minimal, and sufficient.
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The widget can make use of extra space, so it should get as much
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space as possible (e.g. the horizontal direction of a slider).
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<li><tt>QSizePolicy::Ignored</tt> - the sizeHint() is ignored. The widget will get as
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much space as possible.
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QSizePolicy"></a>QSizePolicy::QSizePolicy ()
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</h3>
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<p> Constructs a minimally initialized QSizePolicy.
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<h3 class=fn><a name="QSizePolicy-2"></a>QSizePolicy::QSizePolicy ( <a href="qsizepolicy.html#SizeType-enum">SizeType</a> hor, <a href="qsizepolicy.html#SizeType-enum">SizeType</a> ver, bool hfw = FALSE )
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</h3>
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<p> <a name="interesting"></a>
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This is the constructor normally used to return a value in the
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overridden <a href="qwidget.html#sizePolicy">QWidget::sizePolicy</a>() function of a <a href="qwidget.html">QWidget</a>
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subclass.
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<p> It constructs a QSizePolicy with independent horizontal and
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vertical sizing types, <em>hor</em> and <em>ver</em> respectively. These <a href="#SizeType-enum">sizing types</a> affect how the widget
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is treated by the <a href="qlayout.html">layout engine</a>.
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<p> If <em>hfw</em> is TRUE, the preferred height of the widget is dependent
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on the width of the widget (for example, a <a href="qlabel.html">QLabel</a> with line
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wrapping).
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<p> <p>See also <a href="#horData">horData</a>(), <a href="#verData">verData</a>(), and <a href="#hasHeightForWidth">hasHeightForWidth</a>().
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<h3 class=fn><a name="QSizePolicy-3"></a>QSizePolicy::QSizePolicy ( <a href="qsizepolicy.html#SizeType-enum">SizeType</a> hor, <a href="qsizepolicy.html#SizeType-enum">SizeType</a> ver, uchar horStretch, uchar verStretch, bool hfw = FALSE )
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</h3>
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<p> Constructs a QSizePolicy with independent horizontal and vertical
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sizing types <em>hor</em> and <em>ver</em>, and stretch factors <em>horStretch</em>
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and <em>verStretch</em>.
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<p> If <em>hfw</em> is TRUE, the preferred height of the widget is dependent on the
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width of the widget.
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<p> <p>See also <a href="#horStretch">horStretch</a>() and <a href="#verStretch">verStretch</a>().
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<h3 class=fn><a href="qsizepolicy.html#ExpandData-enum">ExpandData</a> <a name="expanding"></a>QSizePolicy::expanding () const
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</h3>
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<p> Returns whether this layout can make use of more space than
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sizeHint(). A value of <a href="#ExpandData-enum">Vertical</a> or <a href="#ExpandData-enum">Horizontal</a> means that it wants
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to grow in only one dimension, whereas <a href="#ExpandData-enum">BothDirections</a> means that
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it wants to grow in both dimensions.
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<p> <p>See also <a href="#mayShrinkHorizontally">mayShrinkHorizontally</a>(), <a href="#mayGrowHorizontally">mayGrowHorizontally</a>(), <a href="#mayShrinkVertically">mayShrinkVertically</a>(), and <a href="#mayGrowVertically">mayGrowVertically</a>().
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<h3 class=fn>bool <a name="hasHeightForWidth"></a>QSizePolicy::hasHeightForWidth () const
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</h3>
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<p> Returns TRUE if the widget's preferred height depends on its
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width; otherwise returns FALSE.
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<p> <p>See also <a href="#setHeightForWidth">setHeightForWidth</a>().
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<h3 class=fn><a href="qsizepolicy.html#SizeType-enum">SizeType</a> <a name="horData"></a>QSizePolicy::horData () const
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</h3>
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<p> Returns the horizontal component of the size policy.
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<p> <p>See also <a href="#setHorData">setHorData</a>(), <a href="#verData">verData</a>(), and <a href="#horStretch">horStretch</a>().
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<h3 class=fn>uint <a name="horStretch"></a>QSizePolicy::horStretch () const
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</h3>
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<p> Returns the horizontal <a href="layout.html#stretch-factor">stretch factor</a> of the size policy.
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<p> <p>See also <a href="#setHorStretch">setHorStretch</a>() and <a href="#verStretch">verStretch</a>().
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<h3 class=fn>bool <a name="mayGrowHorizontally"></a>QSizePolicy::mayGrowHorizontally () const
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</h3>
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<p> Returns TRUE if the widget can sensibly be wider than its
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sizeHint(); otherwise returns FALSE.
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<p> <p>See also <a href="#mayGrowVertically">mayGrowVertically</a>() and <a href="#mayShrinkHorizontally">mayShrinkHorizontally</a>().
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<h3 class=fn>bool <a name="mayGrowVertically"></a>QSizePolicy::mayGrowVertically () const
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</h3>
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<p> Returns TRUE if the widget can sensibly be taller than its
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sizeHint(); otherwise returns FALSE.
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<p> <p>See also <a href="#mayGrowHorizontally">mayGrowHorizontally</a>() and <a href="#mayShrinkVertically">mayShrinkVertically</a>().
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<h3 class=fn>bool <a name="mayShrinkHorizontally"></a>QSizePolicy::mayShrinkHorizontally () const
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</h3>
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<p> Returns TRUE if the widget can sensibly be narrower than its
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sizeHint(); otherwise returns FALSE.
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<p> <p>See also <a href="#mayShrinkVertically">mayShrinkVertically</a>() and <a href="#mayGrowHorizontally">mayGrowHorizontally</a>().
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<h3 class=fn>bool <a name="mayShrinkVertically"></a>QSizePolicy::mayShrinkVertically () const
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</h3>
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<p> Returns TRUE if the widget can sensibly be shorter than its
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sizeHint(); otherwise returns FALSE.
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<p> <p>See also <a href="#mayShrinkHorizontally">mayShrinkHorizontally</a>() and <a href="#mayGrowVertically">mayGrowVertically</a>().
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<h3 class=fn>bool <a name="operator!-eq"></a>QSizePolicy::operator!= ( const <a href="qsizepolicy.html">QSizePolicy</a> & s ) const
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</h3>
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<p> Returns TRUE if this policy is different from <em>s</em>; otherwise
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returns FALSE.
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<p> <p>See also <a href="#operator-eq-eq">operator==</a>().
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<h3 class=fn>bool <a name="operator-eq-eq"></a>QSizePolicy::operator== ( const <a href="qsizepolicy.html">QSizePolicy</a> & s ) const
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</h3>
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<p> Returns TRUE if this policy is equal to <em>s</em>; otherwise returns
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FALSE.
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<p> <p>See also <a href="#operator!-eq">operator!=</a>().
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<h3 class=fn>void <a name="setHeightForWidth"></a>QSizePolicy::setHeightForWidth ( bool b )
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</h3>
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<p> Sets the <a href="#hasHeightForWidth">hasHeightForWidth</a>() flag to <em>b</em>.
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<p> <p>See also <a href="#hasHeightForWidth">hasHeightForWidth</a>().
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<h3 class=fn>void <a name="setHorData"></a>QSizePolicy::setHorData ( <a href="qsizepolicy.html#SizeType-enum">SizeType</a> d )
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</h3>
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<p> Sets the horizontal component of the size policy to size type <em>d</em>.
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<p> <p>See also <a href="#horData">horData</a>() and <a href="#setVerData">setVerData</a>().
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<h3 class=fn>void <a name="setHorStretch"></a>QSizePolicy::setHorStretch ( uchar sf )
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</h3>
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<p> Sets the horizontal <a href="layout.html#stretch-factor">stretch factor</a> of the size policy to <em>sf</em>.
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<p> <p>See also <a href="#horStretch">horStretch</a>() and <a href="#setVerStretch">setVerStretch</a>().
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<h3 class=fn>void <a name="setVerData"></a>QSizePolicy::setVerData ( <a href="qsizepolicy.html#SizeType-enum">SizeType</a> d )
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</h3>
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<p> Sets the vertical component of the size policy to size type <em>d</em>.
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<p> <p>See also <a href="#verData">verData</a>() and <a href="#setHorData">setHorData</a>().
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<h3 class=fn>void <a name="setVerStretch"></a>QSizePolicy::setVerStretch ( uchar sf )
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</h3>
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<p> Sets the vertical <a href="layout.html#stretch-factor">stretch factor</a> of the size policy to <em>sf</em>.
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<p> <p>See also <a href="#verStretch">verStretch</a>() and <a href="#setHorStretch">setHorStretch</a>().
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<h3 class=fn>void <a name="transpose"></a>QSizePolicy::transpose ()
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</h3>
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<p> Swaps the horizontal and vertical policies and stretches.
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<h3 class=fn><a href="qsizepolicy.html#SizeType-enum">SizeType</a> <a name="verData"></a>QSizePolicy::verData () const
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</h3>
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<p> Returns the vertical component of the size policy.
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||
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<p> <p>See also <a href="#setVerData">setVerData</a>(), <a href="#horData">horData</a>(), and <a href="#verStretch">verStretch</a>().
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||
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<h3 class=fn>uint <a name="verStretch"></a>QSizePolicy::verStretch () const
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</h3>
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||
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||
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<p> Returns the vertical <a href="layout.html#stretch-factor">stretch factor</a> of the size policy.
|
||
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<p> <p>See also <a href="#setVerStretch">setVerStretch</a>() and <a href="#horStretch">horStretch</a>().
|
||
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||
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<!-- eof -->
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<hr><p>
|
||
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This file is part of the <a href="index.html">Qt toolkit</a>.
|
||
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Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
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</html>
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