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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>QLayout Class Reference</h1>
<p>The QLayout class is the base class of geometry managers.
<a href="#details">More...</a>
<p><tt>#include <<a href="qlayout-h.html">qlayout.h</a>></tt>
<p>Inherits <a href="qobject.html">QObject</a> and <a href="qlayoutitem.html">QLayoutItem</a>.
<p>Inherited by <a href="qgridlayout.html">QGridLayout</a> and <a href="qboxlayout.html">QBoxLayout</a>.
<p><a href="qlayout-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class=fn><a href="#QLayout"><b>QLayout</b></a> ( QWidget * parent, int margin = 0, int spacing = -1, const char * name = 0 )</div></li>
<li><div class=fn><a href="#QLayout-2"><b>QLayout</b></a> ( QLayout * parentLayout, int spacing = -1, const char * name = 0 )</div></li>
<li><div class=fn><a href="#QLayout-3"><b>QLayout</b></a> ( int spacing = -1, const char * name = 0 )</div></li>
<li><div class=fn>int <a href="#margin"><b>margin</b></a> () const</div></li>
<li><div class=fn>int <a href="#spacing"><b>spacing</b></a> () const</div></li>
<li><div class=fn>virtual void <a href="#setMargin"><b>setMargin</b></a> ( int )</div></li>
<li><div class=fn>virtual void <a href="#setSpacing"><b>setSpacing</b></a> ( int )</div></li>
<li><div class=fn>enum <a href="#ResizeMode-enum"><b>ResizeMode</b></a> { FreeResize, Minimum, Fixed }</div></li>
<li><div class=fn>void <a href="#setResizeMode"><b>setResizeMode</b></a> ( ResizeMode )</div></li>
<li><div class=fn>ResizeMode <a href="#resizeMode"><b>resizeMode</b></a> () const</div></li>
<li><div class=fn>virtual void <a href="#setMenuBar"><b>setMenuBar</b></a> ( QMenuBar * w )</div></li>
<li><div class=fn>QMenuBar * <a href="#menuBar"><b>menuBar</b></a> () const</div></li>
<li><div class=fn>QWidget * <a href="#mainWidget"><b>mainWidget</b></a> ()</div></li>
<li><div class=fn>bool <a href="#isTopLevel"><b>isTopLevel</b></a> () const</div></li>
<li><div class=fn>virtual void <a href="#setAutoAdd"><b>setAutoAdd</b></a> ( bool b )</div></li>
<li><div class=fn>bool <a href="#autoAdd"><b>autoAdd</b></a> () const</div></li>
<li><div class=fn>virtual void <a href="#invalidate"><b>invalidate</b></a> ()</div></li>
<li><div class=fn>bool <a href="#activate"><b>activate</b></a> ()</div></li>
<li><div class=fn>void <a href="#add"><b>add</b></a> ( QWidget * w )</div></li>
<li><div class=fn>virtual void <a href="#addItem"><b>addItem</b></a> ( QLayoutItem * item ) = 0</div></li>
<li><div class=fn>virtual QSizePolicy::ExpandData <a href="#expanding"><b>expanding</b></a> () const</div></li>
<li><div class=fn>virtual QSize <a href="#minimumSize"><b>minimumSize</b></a> () const</div></li>
<li><div class=fn>virtual QSize <a href="#maximumSize"><b>maximumSize</b></a> () const</div></li>
<li><div class=fn>virtual void <a href="#setGeometry"><b>setGeometry</b></a> ( const QRect & r ) = 0</div></li>
<li><div class=fn>virtual QLayoutIterator <a href="#iterator"><b>iterator</b></a> () = 0</div></li>
<li><div class=fn>virtual bool <a href="#isEmpty"><b>isEmpty</b></a> () const</div></li>
<li><div class=fn>bool <a href="#supportsMargin"><b>supportsMargin</b></a> () const</div></li>
<li><div class=fn>void <a href="#setEnabled"><b>setEnabled</b></a> ( bool enable )</div></li>
<li><div class=fn>bool <a href="#isEnabled"><b>isEnabled</b></a> () const</div></li>
</ul>
<h2>Properties</h2>
<ul>
<li><div class=fn>int <a href="#margin-prop"><b>margin</b></a> - the width of the outside border of the layout</div></li>
<li><div class=fn>ResizeMode <a href="#resizeMode-prop"><b>resizeMode</b></a> - the resize mode of the layout</div></li>
<li><div class=fn>int <a href="#spacing-prop"><b>spacing</b></a> - the spacing between widgets inside the layout</div></li>
</ul>
<h2>Protected Members</h2>
<ul>
<li><div class=fn>void <a href="#addChildLayout"><b>addChildLayout</b></a> ( QLayout * l )</div></li>
<li><div class=fn>void <a href="#deleteAllItems"><b>deleteAllItems</b></a> ()</div></li>
<li><div class=fn>void <a href="#setSupportsMargin"><b>setSupportsMargin</b></a> ( bool b )</div></li>
<li><div class=fn>QRect <a href="#alignmentRect"><b>alignmentRect</b></a> ( const QRect & r ) const</div></li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QLayout class is the base class of geometry managers.
<p>
<p> This is an abstract base class inherited by the concrete classes,
<a href="qboxlayout.html">QBoxLayout</a> and <a href="qgridlayout.html">QGridLayout</a>.
<p> For users of QLayout subclasses or of <a href="qmainwindow.html">QMainWindow</a> there is seldom
any need to use the basic functions provided by QLayout, such as <a href="#resizeMode-prop">resizeMode</a> or <a href="#setMenuBar">setMenuBar</a>(). See the <a href="layout.html">layout
overview page</a> for more information.
<p> To make your own layout manager, subclass <a href="qglayoutiterator.html">QGLayoutIterator</a>
and implement the functions <a href="#addItem">addItem</a>(), <a href="qlayoutitem.html#sizeHint">sizeHint</a>(), <a href="#setGeometry">setGeometry</a>(), and
<a href="#iterator">iterator</a>(). You should also implement <a href="#minimumSize">minimumSize</a>() to ensure your
layout isn't resized to zero size if there is too little space. To
support children whose height depend on their widths, implement
<a href="qlayoutitem.html#hasHeightForWidth">hasHeightForWidth</a>() and <a href="qlayoutitem.html#heightForWidth">heightForWidth</a>().
See the <a href="customlayout.html">custom layout page</a> for an
in-depth description.
<p> Geometry management stops when the layout manager is deleted.
<p>See also <a href="appearance.html">Widget Appearance and Style</a> and <a href="geomanagement.html">Layout Management</a>.
<hr><h2>Member Type Documentation</h2>
<h3 class=fn><a name="ResizeMode-enum"></a>QLayout::ResizeMode</h3>
<p> The possible values are:
<ul>
<li><tt>QLayout::Fixed</tt> - The main widget's size is set to <a href="qlayoutitem.html#sizeHint">sizeHint</a>(); it
cannot be resized at all.
<li><tt>QLayout::Minimum</tt> - The main widget's minimum size is set to
<a href="#minimumSize">minimumSize</a>(); it cannot be smaller.
<li><tt>QLayout::FreeResize</tt> - The widget is not constrained.
</ul>
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QLayout"></a>QLayout::QLayout ( <a href="qwidget.html">QWidget</a> * parent, int margin = 0, int spacing = -1, const char * name = 0 )
</h3>
Constructs a new top-level QLayout with main widget <em>parent</em>, and name <em>name</em>. <em>parent</em> may not be 0.
<p> The <em>margin</em> is the number of pixels between the edge of the widget and
the managed children. The <em>spacing</em> sets the value of <a href="#spacing">spacing</a>(), which
gives the spacing between the managed widgets. If <em>spacing</em> is -1
(the default), spacing is set to the value of <em>margin</em>.
<p> There can be only one top-level layout for a widget. It is returned
by <a href="qwidget.html#layout">QWidget::layout</a>()
<h3 class=fn><a name="QLayout-2"></a>QLayout::QLayout ( <a href="qlayout.html">QLayout</a> * parentLayout, int spacing = -1, const char * name = 0 )
</h3>
Constructs a new child QLayout called <em>name</em>, and places it inside
<em>parentLayout</em> by using the default placement defined by <a href="#addItem">addItem</a>().
<p> If <em>spacing</em> is -1, this QLayout inherits <em>parentLayout</em>'s
<a href="#spacing">spacing</a>(), otherwise the value of <em>spacing</em> is used.
<p>
<h3 class=fn><a name="QLayout-3"></a>QLayout::QLayout ( int spacing = -1, const char * name = 0 )
</h3>
Constructs a new child QLayout called <em>name</em>.
If <em>spacing</em> is -1, this QLayout inherits its parent's
<a href="#spacing">spacing</a>(); otherwise the value of <em>spacing</em> is used.
<p> This layout has to be inserted into another layout before geometry
management will work.
<h3 class=fn>bool <a name="activate"></a>QLayout::activate ()
</h3> Redoes the layout for <a href="#mainWidget">mainWidget</a>(). You should generally not
need to call this because it is automatically called at the most appropriate
times.
<p> However, if you set up a QLayout for a visible widget without
resizing that widget, you will need to call this function in order to lay
it out.
<p> <p>See also <a href="qwidget.html#updateGeometry">QWidget::updateGeometry</a>().
<p>Examples: <a href="layout-example.html#x1334">layout/layout.cpp</a>, <a href="popup-example.html#x883">popup/popup.cpp</a>, <a href="scrollview-example.html#x483">scrollview/scrollview.cpp</a> and <a href="sql.html#x2336">sql/overview/form1/main.cpp</a>.
<h3 class=fn>void <a name="add"></a>QLayout::add ( <a href="qwidget.html">QWidget</a> * w )
</h3>
<p> Adds widget <em>w</em> to this layout in a manner specific to the layout.
This function uses addItem.
<p>Examples: <a href="customlayout-example.html#x1799">customlayout/border.cpp</a> and <a href="customlayout-example.html#x1846">customlayout/main.cpp</a>.
<h3 class=fn>void <a name="addChildLayout"></a>QLayout::addChildLayout ( <a href="qlayout.html">QLayout</a> * l )<tt> [protected]</tt>
</h3>
This function is called from addLayout() functions in subclasses to
add layout <em>l</em> as a sublayout.
<h3 class=fn>void <a name="addItem"></a>QLayout::addItem ( <a href="qlayoutitem.html">QLayoutItem</a> * item )<tt> [pure virtual]</tt>
</h3>
<p> Implemented in subclasses to add an <em>item</em>. How it is added is
specific to each subclass.
<p> The ownership of <em>item</em> is transferred to the layout, and it's the
layout's responsibility to delete it.
<p>Examples: <a href="customlayout-example.html#x1800">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1821">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1777">customlayout/flow.cpp</a>.
<p>Reimplemented in <a href="qgridlayout.html#addItem-2">QGridLayout</a> and <a href="qboxlayout.html#addItem">QBoxLayout</a>.
<h3 class=fn><a href="qrect.html">QRect</a> <a name="alignmentRect"></a>QLayout::alignmentRect ( const <a href="qrect.html">QRect</a> & r ) const<tt> [protected]</tt>
</h3>
Returns the rectangle that should be covered when the geometry of
this layout is set to <em>r</em>, provided that this layout supports
<a href="qlayoutitem.html#setAlignment">setAlignment</a>().
<p> The result is derived from <a href="qlayoutitem.html#sizeHint">sizeHint</a>() and <a href="#expanding">expanding</a>(). It is
never larger than <em>r</em>.
<h3 class=fn>bool <a name="autoAdd"></a>QLayout::autoAdd () const
</h3>
Returns TRUE if this layout automatically grabs all new
<a href="#mainWidget">mainWidget</a>()'s new children and adds them as defined by
<a href="#addItem">addItem</a>(); otherwise returns FALSE. This has effect only for
top-level layouts, i.e. layouts that are direct children of their
mainWidget().
<p> <a href="#autoAdd">autoAdd</a>() is disabled by default.
<p> Note that a top-level layout is not necessarily associated with the
top-level widget.
<p> <p>See also <a href="#setAutoAdd">setAutoAdd</a>().
<h3 class=fn>void <a name="deleteAllItems"></a>QLayout::deleteAllItems ()<tt> [protected]</tt>
</h3>
Removes and deletes all items in this layout.
<h3 class=fn><a href="qsizepolicy.html#ExpandData-enum">QSizePolicy::ExpandData</a> <a name="expanding"></a>QLayout::expanding () const<tt> [virtual]</tt>
</h3>
Returns whether this layout can make use of more space than
<a href="qlayoutitem.html#sizeHint">sizeHint</a>(). A value of Vertical or Horizontal means that it wants
to grow in only one dimension, whereas BothDirections means that it wants to
grow in both dimensions.
<p> The default implementation returns BothDirections.
<p>Examples: <a href="customlayout-example.html#x1801">customlayout/border.cpp</a> and <a href="customlayout-example.html#x1778">customlayout/flow.cpp</a>.
<p>Reimplemented from <a href="qlayoutitem.html#expanding">QLayoutItem</a>.
<p>Reimplemented in <a href="qgridlayout.html#expanding">QGridLayout</a> and <a href="qboxlayout.html#expanding">QBoxLayout</a>.
<h3 class=fn>void <a name="invalidate"></a>QLayout::invalidate ()<tt> [virtual]</tt>
</h3>
Invalidates cached information. Reimplementations must call this.
<p>Reimplemented from <a href="qlayoutitem.html#invalidate">QLayoutItem</a>.
<p>Reimplemented in <a href="qgridlayout.html#invalidate">QGridLayout</a> and <a href="qboxlayout.html#invalidate">QBoxLayout</a>.
<h3 class=fn>bool <a name="isEmpty"></a>QLayout::isEmpty () const<tt> [virtual]</tt>
</h3>
Returns TRUE if this layout is empty. The default implementation
returns FALSE.
<p>Reimplemented from <a href="qlayoutitem.html#isEmpty">QLayoutItem</a>.
<h3 class=fn>bool <a name="isEnabled"></a>QLayout::isEnabled () const
</h3>
Returns TRUE if the layout is enabled; otherwise returns FALSE.
<p> <p>See also <a href="#setEnabled">setEnabled</a>().
<h3 class=fn>bool <a name="isTopLevel"></a>QLayout::isTopLevel () const
</h3>
<p> Returns TRUE if this layout is a top-level layout, i.e., not a child
of another layout; otherwise returns FALSE.
<h3 class=fn><a href="qlayoutiterator.html">QLayoutIterator</a> <a name="iterator"></a>QLayout::iterator ()<tt> [pure virtual]</tt>
</h3>
<p> Implemented in subclasses to return an iterator that iterates over
the children of this layout.
<p> A typical implementation will be:
<pre>
QLayoutIterator MyLayout::iterator()
{
<a href="qglayoutiterator.html">QGLayoutIterator</a> *i = new MyLayoutIterator( internal_data );
return QLayoutIterator( i );
}
</pre>
where MyLayoutIterator is a subclass of <a href="qglayoutiterator.html">QGLayoutIterator</a>.
<p>Examples: <a href="customlayout-example.html#x1802">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1822">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1779">customlayout/flow.cpp</a>.
<p>Reimplemented from <a href="qlayoutitem.html#iterator">QLayoutItem</a>.
<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="mainWidget"></a>QLayout::mainWidget ()
</h3>
Returns the main widget (parent widget) of this layout, or 0 if this
layout is a sub-layout that is not yet inserted.
<h3 class=fn>int <a name="margin"></a>QLayout::margin () const
</h3><p>Returns the width of the outside border of the layout.
See the <a href="qlayout.html#margin-prop">"margin"</a> property for details.
<h3 class=fn><a href="qsize.html">QSize</a> <a name="maximumSize"></a>QLayout::maximumSize () const<tt> [virtual]</tt>
</h3>
Returns the maximum size of this layout. This is the largest size
that the layout can have while still respecting the specifications.
Does not include what's needed by <a href="#margin">margin</a>() or <a href="#menuBar">menuBar</a>().
<p> The default implementation allows unlimited resizing.
<p>Reimplemented from <a href="qlayoutitem.html#maximumSize">QLayoutItem</a>.
<p>Reimplemented in <a href="qgridlayout.html#maximumSize">QGridLayout</a> and <a href="qboxlayout.html#maximumSize">QBoxLayout</a>.
<h3 class=fn><a href="qmenubar.html">QMenuBar</a> * <a name="menuBar"></a>QLayout::menuBar () const
</h3>
<p> Returns the menu bar set for this layout, or a null pointer if no
menu bar is set.
<h3 class=fn><a href="qsize.html">QSize</a> <a name="minimumSize"></a>QLayout::minimumSize () const<tt> [virtual]</tt>
</h3>
Returns the minimum size of this layout. This is the smallest size
that the layout can have while still respecting the specifications.
Does not include what's needed by <a href="#margin">margin</a>() or <a href="#menuBar">menuBar</a>().
<p> The default implementation allows unlimited resizing.
<p>Examples: <a href="customlayout-example.html#x1803">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1823">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1780">customlayout/flow.cpp</a>.
<p>Reimplemented from <a href="qlayoutitem.html#minimumSize">QLayoutItem</a>.
<p>Reimplemented in <a href="qgridlayout.html#minimumSize">QGridLayout</a> and <a href="qboxlayout.html#minimumSize">QBoxLayout</a>.
<h3 class=fn><a href="qlayout.html#ResizeMode-enum">ResizeMode</a> <a name="resizeMode"></a>QLayout::resizeMode () const
</h3><p>Returns the resize mode of the layout.
See the <a href="qlayout.html#resizeMode-prop">"resizeMode"</a> property for details.
<h3 class=fn>void <a name="setAutoAdd"></a>QLayout::setAutoAdd ( bool b )<tt> [virtual]</tt>
</h3>
If <em>b</em> is TRUE auto-add is enabled; otherwise auto-add is disabled.
<p> <p>See also <a href="#autoAdd">autoAdd</a>().
<p>Example: <a href="i18n-example.html#x1373">i18n/main.cpp</a>.
<h3 class=fn>void <a name="setEnabled"></a>QLayout::setEnabled ( bool enable )
</h3>
Enables this layout if <em>enable</em> is TRUE, otherwise disables it.
<p> An enabled layout adjusts dynamically to changes; a disabled layout
acts as if it did not exist.
<p> By default all layouts are enabled.
<p> <p>See also <a href="#isEnabled">isEnabled</a>().
<h3 class=fn>void <a name="setGeometry"></a>QLayout::setGeometry ( const <a href="qrect.html">QRect</a> & r )<tt> [pure virtual]</tt>
</h3>
This function is reimplemented in subclasses to
perform layout.
<p> The default implementation maintains the <a href="qlayoutitem.html#geometry">geometry</a>() information
given by rect <em>r</em>. Reimplementors must call this function.
<p>Examples: <a href="customlayout-example.html#x1804">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1824">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1781">customlayout/flow.cpp</a>.
<p>Reimplemented from <a href="qlayoutitem.html#setGeometry">QLayoutItem</a>.
<p>Reimplemented in <a href="qgridlayout.html#setGeometry">QGridLayout</a> and <a href="qboxlayout.html#setGeometry">QBoxLayout</a>.
<h3 class=fn>void <a name="setMargin"></a>QLayout::setMargin ( int )<tt> [virtual]</tt>
</h3><p>Sets the width of the outside border of the layout.
See the <a href="qlayout.html#margin-prop">"margin"</a> property for details.
<h3 class=fn>void <a name="setMenuBar"></a>QLayout::setMenuBar ( <a href="qmenubar.html">QMenuBar</a> * w )<tt> [virtual]</tt>
</h3>
Makes the geometry manager take account of the menu bar <em>w</em>. All
child widgets are placed below the bottom edge of the menu bar.
<p> A menu bar does its own geometry management: never do addWidget()
on a <a href="qmenubar.html">QMenuBar</a>.
<p>Examples: <a href="layout-example.html#x1335">layout/layout.cpp</a> and <a href="scrollview-example.html#x484">scrollview/scrollview.cpp</a>.
<h3 class=fn>void <a name="setResizeMode"></a>QLayout::setResizeMode ( <a href="qlayout.html#ResizeMode-enum">ResizeMode</a> )
</h3><p>Sets the resize mode of the layout.
See the <a href="qlayout.html#resizeMode-prop">"resizeMode"</a> property for details.
<h3 class=fn>void <a name="setSpacing"></a>QLayout::setSpacing ( int )<tt> [virtual]</tt>
</h3><p>Sets the spacing between widgets inside the layout.
See the <a href="qlayout.html#spacing-prop">"spacing"</a> property for details.
<h3 class=fn>void <a name="setSupportsMargin"></a>QLayout::setSupportsMargin ( bool b )<tt> [protected]</tt>
</h3>
Sets the value returned by <a href="#supportsMargin">supportsMargin</a>(). If <em>b</em> is TRUE,
<a href="#margin">margin</a>() handling is implemented by the subclass. If <em>b</em> is
FALSE (the default), QLayout will add margin() around top-level
layouts.
<p> If <em>b</em> is TRUE, margin handling needs to be implemented in
<a href="#setGeometry">setGeometry</a>(), <a href="#maximumSize">maximumSize</a>(), <a href="#minimumSize">minimumSize</a>(), <a href="qlayoutitem.html#sizeHint">sizeHint</a>() and
<a href="qlayoutitem.html#heightForWidth">heightForWidth</a>().
<p> <p>See also <a href="#supportsMargin">supportsMargin</a>().
<h3 class=fn>int <a name="spacing"></a>QLayout::spacing () const
</h3><p>Returns the spacing between widgets inside the layout.
See the <a href="qlayout.html#spacing-prop">"spacing"</a> property for details.
<h3 class=fn>bool <a name="supportsMargin"></a>QLayout::supportsMargin () const
</h3>
<p> Returns TRUE if this layout supports <a href="#margin-prop">QLayout::margin</a> on non-top-level
layouts; otherwise returns FALSE.
<p> <p>See also <a href="#margin-prop">margin</a>.
<hr><h2>Property Documentation</h2>
<h3 class=fn>int <a name="margin-prop"></a>margin</h3>
<p>This property holds the width of the outside border of the layout.
<p>For some layout classes this property has an effect only on
top-level layouts; <a href="qboxlayout.html">QBoxLayout</a> and <a href="qgridlayout.html">QGridLayout</a> support margins for
child layouts. The default value is 0.
<p> <p>See also <a href="#spacing-prop">spacing</a>.
<p>Set this property's value with <a href="#setMargin">setMargin</a>() and get this property's value with <a href="#margin">margin</a>().
<h3 class=fn><a href="qlayout.html#ResizeMode-enum">ResizeMode</a> <a name="resizeMode-prop"></a>resizeMode</h3>
<p>This property holds the resize mode of the layout.
<p>The default mode is <a href="#ResizeMode-enum">Minimum</a> for top-level widgets and <a href="#ResizeMode-enum">FreeResize</a>
for all others.
<p> <p>See also <a href="#ResizeMode-enum">QLayout::ResizeMode</a>.
<p>Set this property's value with <a href="#setResizeMode">setResizeMode</a>() and get this property's value with <a href="#resizeMode">resizeMode</a>().
<h3 class=fn>int <a name="spacing-prop"></a>spacing</h3>
<p>This property holds the spacing between widgets inside the layout.
<p>The default value is -1, which signifies that the layout's spacing
should not override the widget's spacing.
<p> <p>See also <a href="#margin-prop">margin</a>.
<p>Set this property's value with <a href="#setSpacing">setSpacing</a>() and get this property's value with <a href="#spacing">spacing</a>().
<!-- eof -->
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