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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>QBoxLayout Class Reference</h1>
<p>The QBoxLayout class lines up child widgets horizontally or
vertically.
<a href="#details">More...</a>
<p><tt>#include <<a href="qlayout-h.html">qlayout.h</a>></tt>
<p>Inherits <a href="qlayout.html">QLayout</a>.
<p>Inherited by <a href="qhboxlayout.html">QHBoxLayout</a> and <a href="qvboxlayout.html">QVBoxLayout</a>.
<p><a href="qboxlayout-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn>enum <a href="#Direction-enum"><b>Direction</b></a> { LeftToRight, RightToLeft, TopToBottom, BottomToTop, Down = TopToBottom, Up = BottomToTop }</li>
<li class=fn><a href="#QBoxLayout"><b>QBoxLayout</b></a> ( QWidget * parent, Direction d, int margin = 0, int spacing = -1, const char * name = 0 )</li>
<li class=fn><a href="#QBoxLayout-2"><b>QBoxLayout</b></a> ( QLayout * parentLayout, Direction d, int spacing = -1, const char * name = 0 )</li>
<li class=fn><a href="#QBoxLayout-3"><b>QBoxLayout</b></a> ( Direction d, int spacing = -1, const char * name = 0 )</li>
<li class=fn><a href="#~QBoxLayout"><b>~QBoxLayout</b></a> ()</li>
<li class=fn>virtual void <a href="#addItem"><b>addItem</b></a> ( QLayoutItem * item )</li>
<li class=fn>Direction <a href="#direction"><b>direction</b></a> () const</li>
<li class=fn>void <a href="#setDirection"><b>setDirection</b></a> ( Direction direction )</li>
<li class=fn>void <a href="#addSpacing"><b>addSpacing</b></a> ( int size )</li>
<li class=fn>void <a href="#addStretch"><b>addStretch</b></a> ( int stretch = 0 )</li>
<li class=fn>void <a href="#addWidget"><b>addWidget</b></a> ( QWidget * widget, int stretch = 0, int alignment = 0 )</li>
<li class=fn>void <a href="#addLayout"><b>addLayout</b></a> ( QLayout * layout, int stretch = 0 )</li>
<li class=fn>void <a href="#addStrut"><b>addStrut</b></a> ( int size )</li>
<li class=fn>void <a href="#insertSpacing"><b>insertSpacing</b></a> ( int index, int size )</li>
<li class=fn>void <a href="#insertStretch"><b>insertStretch</b></a> ( int index, int stretch = 0 )</li>
<li class=fn>void <a href="#insertWidget"><b>insertWidget</b></a> ( int index, QWidget * widget, int stretch = 0, int alignment = 0 )</li>
<li class=fn>void <a href="#insertLayout"><b>insertLayout</b></a> ( int index, QLayout * layout, int stretch = 0 )</li>
<li class=fn>bool <a href="#setStretchFactor"><b>setStretchFactor</b></a> ( QWidget * w, int stretch )</li>
<li class=fn>bool <a href="#setStretchFactor-2"><b>setStretchFactor</b></a> ( QLayout * l, int stretch )</li>
<li class=fn>virtual QSize <a href="#sizeHint"><b>sizeHint</b></a> () const</li>
<li class=fn>virtual QSize <a href="#minimumSize"><b>minimumSize</b></a> () const</li>
<li class=fn>virtual QSize <a href="#maximumSize"><b>maximumSize</b></a> () const</li>
<li class=fn>virtual bool <a href="#hasHeightForWidth"><b>hasHeightForWidth</b></a> () const</li>
<li class=fn>virtual int <a href="#heightForWidth"><b>heightForWidth</b></a> ( int w ) const</li>
<li class=fn>virtual QSizePolicy::ExpandData <a href="#expanding"><b>expanding</b></a> () const</li>
<li class=fn>virtual void <a href="#invalidate"><b>invalidate</b></a> ()</li>
<li class=fn>virtual void <a href="#setGeometry"><b>setGeometry</b></a> ( const QRect & r )</li>
<li class=fn>int <a href="#findWidget"><b>findWidget</b></a> ( QWidget * w )</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>void <a href="#insertItem"><b>insertItem</b></a> ( int index, QLayoutItem * item )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
<p> The QBoxLayout class lines up child widgets horizontally or
vertically.
<p>
<p> QBoxLayout takes the space it gets (from its parent layout or from
the <a href="qlayout.html#mainWidget">mainWidget</a>()), divides it up into a row of boxes, and makes
each managed widget fill one box.
<p> <center><img src="qhbox-m.png" alt="Horizontal box with five child widgets"></center>
<p> If the QBoxLayout's orientation is <a href="qt.html#Orientation-enum">Horizontal</a> the boxes are
placed in a row, with suitable sizes. Each widget (or other box)
will get at least its minimum size and at most its maximum size.
Any excess space is shared according to the stretch factors (more
about that below).
<p> <center><img src="qvbox-m.png" alt="Vertical box with five child widgets"></center>
<p> If the QBoxLayout's orientation is <a href="qt.html#Orientation-enum">Vertical</a>, the boxes are
placed in a column, again with suitable sizes.
<p> The easiest way to create a QBoxLayout is to use one of the
convenience classes, e.g. <a href="qhboxlayout.html">QHBoxLayout</a> (for <a href="qt.html#Orientation-enum">Horizontal</a> boxes) or
<a href="qvboxlayout.html">QVBoxLayout</a> (for <a href="qt.html#Orientation-enum">Vertical</a> boxes). You can also use the
QBoxLayout constructor directly, specifying its direction as <a href="#Direction-enum">LeftToRight</a>, <a href="#Direction-enum">Down</a>, <a href="#Direction-enum">RightToLeft</a> or <a href="#Direction-enum">Up</a>.
<p> If the QBoxLayout is not the top-level layout (i.e. it is not
managing all of the widget's area and children), you must add it
to its parent layout before you can do anything with it. The
normal way to add a layout is by calling
parentLayout->addLayout().
<p> Once you have done this, you can add boxes to the QBoxLayout using
one of four functions:
<p> <ul>
<li> <a href="#addWidget">addWidget</a>() to add a widget to the QBoxLayout and set the
widget's <a href="layout.html#stretch-factor">stretch factor</a>. (The stretch factor is along the row of
boxes.)
<p> <li> <a href="#addSpacing">addSpacing</a>() to create an empty box; this is one of the
functions you use to create nice and spacious dialogs. See below
for ways to set margins.
<p> <li> <a href="#addStretch">addStretch</a>() to create an empty, stretchable box.
<p> <li> <a href="#addLayout">addLayout</a>() to add a box containing another <a href="qlayout.html">QLayout</a> to the row
and set that layout's stretch factor.
</ul>
<p> Use <a href="#insertWidget">insertWidget</a>(), <a href="#insertSpacing">insertSpacing</a>(), <a href="#insertStretch">insertStretch</a>() or
<a href="#insertLayout">insertLayout</a>() to insert a box at a specified position in the
layout.
<p> QBoxLayout also includes two margin widths:
<p> <ul>
<li> <a href="qlayout.html#setMargin">setMargin</a>() sets the width of the outer border. This is the width
of the reserved space along each of the QBoxLayout's four sides.
<li> <a href="qlayout.html#setSpacing">setSpacing</a>() sets the width between neighboring boxes. (You
can use <a href="#addSpacing">addSpacing</a>() to get more space at a particular spot.)
</ul>
<p> The margin defaults to 0. The spacing defaults to the same as the
margin width for a top-level layout, or to the same as the parent
layout. Both are parameters to the constructor.
<p> To remove a widget from a layout, call <a href="qlayout.html#remove">remove</a>(). Calling
<a href="qwidget.html#hide">QWidget::hide</a>() on a widget also effectively removes the widget
from the layout until <a href="qwidget.html#show">QWidget::show</a>() is called.
<p> You will almost always want to use <a href="qvboxlayout.html">QVBoxLayout</a> and <a href="qhboxlayout.html">QHBoxLayout</a>
rather than QBoxLayout because of their convenient constructors.
<p> <p>See also <a href="qgrid.html">QGrid</a>, <a href="layout.html">Layout Overview</a>, <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="Direction-enum"></a>QBoxLayout::Direction</h3>
<p> This type is used to determine the direction of a box layout.
<ul>
<li><tt>QBoxLayout::LeftToRight</tt> - Horizontal, from left to right
<li><tt>QBoxLayout::RightToLeft</tt> - Horizontal, from right to left
<li><tt>QBoxLayout::TopToBottom</tt> - Vertical, from top to bottom
<li><tt>QBoxLayout::Down</tt> - The same as <a href="#Direction-enum">TopToBottom</a>
<li><tt>QBoxLayout::BottomToTop</tt> - Vertical, from bottom to top
<li><tt>QBoxLayout::Up</tt> - The same as <a href="#Direction-enum">BottomToTop</a>
</ul>
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QBoxLayout"></a>QBoxLayout::QBoxLayout ( <a href="qwidget.html">QWidget</a> * parent, <a href="qboxlayout.html#Direction-enum">Direction</a> d, int margin = 0, int spacing = -1, const char * name = 0 )
</h3>
Constructs a new QBoxLayout with direction <em>d</em> and main widget <em>parent</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 its managed children. The <em>spacing</em> is the default
number of pixels between neighboring children. If <em>spacing</em> is -1
the value of <em>margin</em> is used for <em>spacing</em>.
<p> <em>name</em> is the internal object name.
<p> <p>See also <a href="#direction">direction</a>().
<h3 class=fn><a name="QBoxLayout-2"></a>QBoxLayout::QBoxLayout ( <a href="qlayout.html">QLayout</a> * parentLayout, <a href="qboxlayout.html#Direction-enum">Direction</a> d, int spacing = -1, const char * name = 0 )
</h3>
Constructs a new QBoxLayout called <em>name</em>, with direction <em>d</em>,
and inserts it into <em>parentLayout</em>.
<p> The <em>spacing</em> is the default number of pixels between neighboring
children. If <em>spacing</em> is -1, the layout will inherit its
parent's <a href="qlayout.html#spacing">spacing</a>().
<h3 class=fn><a name="QBoxLayout-3"></a>QBoxLayout::QBoxLayout ( <a href="qboxlayout.html#Direction-enum">Direction</a> d, int spacing = -1, const char * name = 0 )
</h3>
Constructs a new QBoxLayout called <em>name</em>, with direction <em>d</em>.
<p> If <em>spacing</em> is -1, the layout will inherit its parent's
<a href="qlayout.html#spacing">spacing</a>(); otherwise <em>spacing</em> is used.
<p> You must insert this box into another layout.
<h3 class=fn><a name="~QBoxLayout"></a>QBoxLayout::~QBoxLayout ()
</h3>
Destroys this box layout.
<p> The layout's widgets aren't destroyed.
<h3 class=fn>void <a name="addItem"></a>QBoxLayout::addItem ( <a href="qlayoutitem.html">QLayoutItem</a> * item )<tt> [virtual]</tt>
</h3>
Adds <em>item</em> to the end of this box layout.
<p>Examples: <a href="tutorial2-09.html#x2629">chart/optionsform.cpp</a> and <a href="tutorial2-08.html#x2593">chart/setdataform.cpp</a>.
<p>Reimplemented from <a href="qlayout.html#addItem">QLayout</a>.
<h3 class=fn>void <a name="addLayout"></a>QBoxLayout::addLayout ( <a href="qlayout.html">QLayout</a> * layout, int stretch = 0 )
</h3>
Adds <em>layout</em> to the end of the box, with serial <a href="layout.html#stretch-factor">stretch factor</a>
<em>stretch</em>.
<p> When a layout is constructed with another layout as its parent,
you don't need to call <a href="#addLayout">addLayout</a>(); the child layout is
automatically added to the parent layout as it is constructed.
<p> <p>See also <a href="#insertLayout">insertLayout</a>(), <a href="qlayout.html#setAutoAdd">setAutoAdd</a>(), <a href="#addWidget">addWidget</a>(), and <a href="#addSpacing">addSpacing</a>().
<p>Examples: <a href="tutorial2-09.html#x2630">chart/optionsform.cpp</a>, <a href="tutorial2-08.html#x2594">chart/setdataform.cpp</a>, <a href="simple-font-demo-example.html#x2835">fonts/simple-qfont-demo/viewer.cpp</a>, <a href="listbox-example.html#x1422">listbox/listbox.cpp</a>, <a href="regexptester-example.html#x2469">regexptester/regexptester.cpp</a>, and <a href="tictac-example.html#x19">tictac/tictac.cpp</a>.
<h3 class=fn>void <a name="addSpacing"></a>QBoxLayout::addSpacing ( int size )
</h3>
Adds a non-stretchable space with size <em>size</em> to the end of this
box layout. QBoxLayout provides default margin and spacing. This
function adds additional space.
<p> <p>See also <a href="#insertSpacing">insertSpacing</a>() and <a href="#addStretch">addStretch</a>().
<p>Example: <a href="listbox-example.html#x1423">listbox/listbox.cpp</a>.
<h3 class=fn>void <a name="addStretch"></a>QBoxLayout::addStretch ( int stretch = 0 )
</h3>
Adds a stretchable space with zero minimum size and <a href="layout.html#stretch-factor">stretch factor</a>
<em>stretch</em> to the end of this box layout.
<p> <p>See also <a href="#addSpacing">addSpacing</a>().
<p>Examples: <a href="layout-example.html#x528">layout/layout.cpp</a>, <a href="listbox-example.html#x1424">listbox/listbox.cpp</a>, <a href="regexptester-example.html#x2470">regexptester/regexptester.cpp</a>, and <a href="tutorial1-13.html#x2410">t13/gamebrd.cpp</a>.
<h3 class=fn>void <a name="addStrut"></a>QBoxLayout::addStrut ( int size )
</h3>
Limits the perpendicular dimension of the box (e.g. height if the
box is LeftToRight) to a minimum of <em>size</em>. Other constraints may
increase the limit.
<h3 class=fn>void <a name="addWidget"></a>QBoxLayout::addWidget ( <a href="qwidget.html">QWidget</a> * widget, int stretch = 0, int alignment = 0 )
</h3>
Adds <em>widget</em> to the end of this box layout, with a <a href="layout.html#stretch-factor">stretch factor</a> of <em>stretch</em> and alignment <em>alignment</em>.
<p> The stretch factor applies only in the <a href="#direction">direction</a> of the QBoxLayout, and is relative to the other boxes and
widgets in this QBoxLayout. Widgets and boxes with higher stretch
factors grow more.
<p> If the stretch factor is 0 and nothing else in the QBoxLayout has
a stretch factor greater than zero, the space is distributed
according to the QWidget:sizePolicy() of each widget that's
involved.
<p> Alignment is specified by <em>alignment</em> which is a bitwise OR of <a href="qt.html#AlignmentFlags-enum">Qt::AlignmentFlags</a> values. The default alignment is 0, which means
that the widget fills the entire cell.
<p> From Qt 3.0, the <em>alignment</em> parameter is interpreted more
aggressively than in previous versions of Qt. A non-default
alignment now indicates that the widget should not grow to fill
the available space, but should be sized according to <a href="#sizeHint">sizeHint</a>().
<p> <p>See also <a href="#insertWidget">insertWidget</a>(), <a href="qlayout.html#setAutoAdd">setAutoAdd</a>(), <a href="#addLayout">addLayout</a>(), and <a href="#addSpacing">addSpacing</a>().
<p>Examples: <a href="tutorial2-09.html#x2631">chart/optionsform.cpp</a>, <a href="checklists-example.html#x423">checklists/checklists.cpp</a>, <a href="layout-example.html#x529">layout/layout.cpp</a>, <a href="lineedits-example.html#x169">lineedits/lineedits.cpp</a>, <a href="listbox-example.html#x1425">listbox/listbox.cpp</a>, <a href="tutorial1-13.html#x2411">t13/gamebrd.cpp</a>, and <a href="tutorial1-13.html#x2401">t13/lcdrange.cpp</a>.
<h3 class=fn><a href="qboxlayout.html#Direction-enum">Direction</a> <a name="direction"></a>QBoxLayout::direction () const
</h3>
<p> Returns the direction of the box. <a href="#addWidget">addWidget</a>() and <a href="#addSpacing">addSpacing</a>()
work in this direction; the stretch stretches in this direction.
<p> <p>See also <a href="#Direction-enum">QBoxLayout::Direction</a>, <a href="#addWidget">addWidget</a>(), and <a href="#addSpacing">addSpacing</a>().
<h3 class=fn><a href="qsizepolicy.html#ExpandData-enum">QSizePolicy::ExpandData</a> <a name="expanding"></a>QBoxLayout::expanding () const<tt> [virtual]</tt>
</h3>
Returns whether this layout can make use of more space than
<a href="#sizeHint">sizeHint</a>(). A value of <a href="qt.html#Orientation-enum">Vertical</a> or <a href="qt.html#Orientation-enum">Horizontal</a> means that it wants
to grow in only one dimension, whereas <tt>BothDirections</tt> means that
it wants to grow in both dimensions.
<p>Reimplemented from <a href="qlayout.html#expanding">QLayout</a>.
<h3 class=fn>int <a name="findWidget"></a>QBoxLayout::findWidget ( <a href="qwidget.html">QWidget</a> * w )
</h3>
Searches for widget <em>w</em> in this layout (not including child
layouts).
<p> Returns the index of <em>w</em>, or -1 if <em>w</em> is not found.
<h3 class=fn>bool <a name="hasHeightForWidth"></a>QBoxLayout::hasHeightForWidth () const<tt> [virtual]</tt>
</h3>
Returns TRUE if this layout's preferred height depends on its width;
otherwise returns FALSE.
<p>Reimplemented from <a href="qlayoutitem.html#hasHeightForWidth">QLayoutItem</a>.
<h3 class=fn>int <a name="heightForWidth"></a>QBoxLayout::heightForWidth ( int w ) const<tt> [virtual]</tt>
</h3>
Returns the layout's preferred height when it is <em>w</em> pixels wide.
<p>Reimplemented from <a href="qlayoutitem.html#heightForWidth">QLayoutItem</a>.
<h3 class=fn>void <a name="insertItem"></a>QBoxLayout::insertItem ( int index, <a href="qlayoutitem.html">QLayoutItem</a> * item )<tt> [protected]</tt>
</h3>
Inserts <em>item</em> into this box layout at position <em>index</em>. If <em>index</em> is negative, the item is added at the end.
<p> <b>Warning:</b> Does not call QLayout::insertChildLayout() if <em>item</em> is
a <a href="qlayout.html">QLayout</a>.
<p> <p>See also <a href="#addItem">addItem</a>() and <a href="#findWidget">findWidget</a>().
<h3 class=fn>void <a name="insertLayout"></a>QBoxLayout::insertLayout ( int index, <a href="qlayout.html">QLayout</a> * layout, int stretch = 0 )
</h3>
Inserts <em>layout</em> at position <em>index</em>, with <a href="layout.html#stretch-factor">stretch factor</a> <em>stretch</em>. If <em>index</em> is negative, the layout is added at the end.
<p> <em>layout</em> becomes a child of the box layout.
<p> <p>See also <a href="qlayout.html#setAutoAdd">setAutoAdd</a>(), <a href="#insertWidget">insertWidget</a>(), and <a href="#insertSpacing">insertSpacing</a>().
<h3 class=fn>void <a name="insertSpacing"></a>QBoxLayout::insertSpacing ( int index, int size )
</h3>
Inserts a non-stretchable space at position <em>index</em>, with size <em>size</em>. If <em>index</em> is negative the space is added at the end.
<p> The box layout has default margin and spacing. This function adds
additional space.
<p> <p>See also <a href="#insertStretch">insertStretch</a>().
<h3 class=fn>void <a name="insertStretch"></a>QBoxLayout::insertStretch ( int index, int stretch = 0 )
</h3>
Inserts a stretchable space at position <em>index</em>, with zero
minimum size and <a href="layout.html#stretch-factor">stretch factor</a> <em>stretch</em>. If <em>index</em> is
negative the space is added at the end.
<p> <p>See also <a href="#insertSpacing">insertSpacing</a>().
<h3 class=fn>void <a name="insertWidget"></a>QBoxLayout::insertWidget ( int index, <a href="qwidget.html">QWidget</a> * widget, int stretch = 0, int alignment = 0 )
</h3>
Inserts <em>widget</em> at position <em>index</em>, with <a href="layout.html#stretch-factor">stretch factor</a> <em>stretch</em> and alignment <em>alignment</em>. If <em>index</em> is negative, the
widget is added at the end.
<p> The stretch factor applies only in the <a href="#direction">direction</a> of the QBoxLayout, and is relative to the other boxes and
widgets in this QBoxLayout. Widgets and boxes with higher stretch
factors grow more.
<p> If the stretch factor is 0 and nothing else in the QBoxLayout has
a stretch factor greater than zero, the space is distributed
according to the QWidget:sizePolicy() of each widget that's
involved.
<p> Alignment is specified by <em>alignment</em>, which is a bitwise OR of
<a href="qt.html#AlignmentFlags-enum">Qt::AlignmentFlags</a> values. The default alignment is 0, which
means that the widget fills the entire cell.
<p> From Qt 3.0, the <em>alignment</em> parameter is interpreted more
aggressively than in previous versions of Qt. A non-default
alignment now indicates that the widget should not grow to fill
the available space, but should be sized according to <a href="#sizeHint">sizeHint</a>().
<p> <p>See also <a href="qlayout.html#setAutoAdd">setAutoAdd</a>(), <a href="#insertLayout">insertLayout</a>(), and <a href="#insertSpacing">insertSpacing</a>().
<h3 class=fn>void <a name="invalidate"></a>QBoxLayout::invalidate ()<tt> [virtual]</tt>
</h3>
Resets cached information.
<p>Reimplemented from <a href="qlayout.html#invalidate">QLayout</a>.
<h3 class=fn><a href="qsize.html">QSize</a> <a name="maximumSize"></a>QBoxLayout::maximumSize () const<tt> [virtual]</tt>
</h3>
Returns the maximum size needed by this box layout.
<p>Reimplemented from <a href="qlayout.html#maximumSize">QLayout</a>.
<h3 class=fn><a href="qsize.html">QSize</a> <a name="minimumSize"></a>QBoxLayout::minimumSize () const<tt> [virtual]</tt>
</h3>
Returns the minimum size needed by this box layout.
<p>Reimplemented from <a href="qlayout.html#minimumSize">QLayout</a>.
<h3 class=fn>void <a name="setDirection"></a>QBoxLayout::setDirection ( <a href="qboxlayout.html#Direction-enum">Direction</a> direction )
</h3>
Sets the direction of this layout to <em>direction</em>.
<h3 class=fn>void <a name="setGeometry"></a>QBoxLayout::setGeometry ( const <a href="qrect.html">QRect</a> & r )<tt> [virtual]</tt>
</h3>
Resizes managed widgets within the rectangle <em>r</em>.
<p>Reimplemented from <a href="qlayout.html#setGeometry">QLayout</a>.
<h3 class=fn>bool <a name="setStretchFactor"></a>QBoxLayout::setStretchFactor ( <a href="qwidget.html">QWidget</a> * w, int stretch )
</h3>
Sets the <a href="layout.html#stretch-factor">stretch factor</a> for widget <em>w</em> to <em>stretch</em> and returns
TRUE if <em>w</em> is found in this layout (not including child
layouts); otherwise returns FALSE.
<h3 class=fn>bool <a name="setStretchFactor-2"></a>QBoxLayout::setStretchFactor ( <a href="qlayout.html">QLayout</a> * l, int stretch )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Sets the <a href="layout.html#stretch-factor">stretch factor</a> for the layout <em>l</em> to <em>stretch</em> and
returns TRUE if <em>l</em> is found in this layout (not including child
layouts); otherwise returns FALSE.
<h3 class=fn><a href="qsize.html">QSize</a> <a name="sizeHint"></a>QBoxLayout::sizeHint () const<tt> [virtual]</tt>
</h3>
Returns the preferred size of this box layout.
<p>Reimplemented from <a href="qlayoutitem.html#sizeHint">QLayoutItem</a>.
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