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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Qt Toolkit - QLayoutItem Class</title><style type="text/css"><!--
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<h1 align=center>QLayoutItem Class Reference</h1><br clear="all">
<p>
The abstract items which a <a href="qlayout.html">QLayout</a> manipulates.
<a href="#details">More...</a>
<p>
<code>#include &lt;<a href="qabstractlayout-h.html">qabstractlayout.h</a>&gt;</code>
<p>Inherited by <a href="qlayout.html">QLayout</a>, <a href="qspaceritem.html">QSpacerItem</a> and <a href="qwidgetitem.html">QWidgetItem</a>.
<p><a href="qlayoutitem-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#78c9ab"><b>QLayoutItem</b></a>(intalignment=0)</div>
<li><div class="fn">virtual<a href="#05fc2d"><b>~QLayoutItem</b></a>()</div>
<li><div class="fn">virtualQSize<a href="#48b5b2"><b>sizeHint</b></a>()const</div>
<li><div class="fn">virtualQSize<a href="#83838c"><b>minimumSize</b></a>()const</div>
<li><div class="fn">virtualQSize<a href="#7c9b8e"><b>maximumSize</b></a>()const</div>
<li><div class="fn">virtualQSizePolicy::ExpandData<a href="#132fc8"><b>expanding</b></a>()const</div>
<li><div class="fn">virtualvoid<a href="#0c6928"><b>setGeometry</b></a>(constQRect&amp;)</div>
<li><div class="fn">virtualQRect<a href="#14a669"><b>geometry</b></a>()const</div>
<li><div class="fn">virtualbool<a href="#ca255b"><b>isEmpty</b></a>()const</div>
<li><div class="fn">virtualbool<a href="#27843f"><b>hasHeightForWidth</b></a>()const</div>
<li><div class="fn">virtualint<a href="#03af08"><b>heightForWidth</b></a>(int)const</div>
<li><div class="fn">virtualvoid<a href="#91d950"><b>invalidate</b></a>()</div>
<li><div class="fn">virtualQWidget*<a href="#618010"><b>widget</b></a>()</div>
<li><div class="fn">virtualQLayoutIterator<a href="#40af74"><b>iterator</b></a>()</div>
<li><div class="fn">virtualQLayout*<a href="#902494"><b>layout</b></a>()</div>
<li><div class="fn">virtualQSpacerItem*<a href="#238c12"><b>spacerItem</b></a>()</div>
<li><div class="fn">int<a href="#4c4fa7"><b>alignment</b></a>()const</div>
<li><div class="fn">virtualvoid<a href="#06c4a7"><b>setAlignment</b></a>(inta)</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The abstract items which a <a href="qlayout.html">QLayout</a> manipulates.
<p>
For custom layouts.
<p>See also  <a href="qlayout.html">QLayout</a>.

<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="78c9ab"></a>QLayoutItem::QLayoutItem(intalignment=0)</h3>
<p>Constructs a layout item with an <em>alignment</em>
that is a bitwise OR of <a href="qt.html#AlignmentFlags">Qt::AlignmentFlags</a>.
Alignment may not be supported by all subclasses.
<h3 class="fn"><a name="05fc2d"></a>QLayoutItem::~QLayoutItem() <code>[virtual]</code></h3>
<p>Destructs the QLayoutItem.
<h3 class="fn">int<a name="4c4fa7"></a>QLayoutItem::alignment()const</h3>
<p>Returns the alignment of this item.
<h3 class="fn">QSizePolicy::ExpandData<a name="132fc8"></a>QLayoutItem::expanding()const <code>[virtual]</code></h3>
<p>Implemented in subclasses to return whether this item "wants" to expand.
<p>Reimplemented in <a href="qspaceritem.html#3cdc6d">QSpacerItem</a>, <a href="qwidgetitem.html#001b7a">QWidgetItem</a>, <a href="qboxlayout.html#2175a1">QBoxLayout</a>, <a href="qlayout.html#b4ec8c">QLayout</a> and <a href="qgridlayout.html#99ccc5">QGridLayout</a>.
<h3 class="fn"><a href="qrect.html">QRect</a><a name="14a669"></a>QLayoutItem::geometry()const <code>[virtual]</code></h3>
<p>Returns the rectangle covered by this layout item.
<p>Reimplemented in <a href="qwidgetitem.html#818023">QWidgetItem</a>, <a href="qlayout.html#688c64">QLayout</a> and <a href="qspaceritem.html#72a6fe">QSpacerItem</a>.
<h3 class="fn">bool<a name="27843f"></a>QLayoutItem::hasHeightForWidth()const <code>[virtual]</code></h3>
<p>Returns TRUE if this layout's preferred height depends on its
width. The default implementation returns FALSE;
<p>Reimplement this function in layout managers that support
height for width.
<p>See also  <a href="#03af08">heightForWidth</a>() and <a href="qwidget.html#1a2d58">QWidget::heightForWidth</a>().
<p>Reimplemented in <a href="qboxlayout.html#60f893">QBoxLayout</a>, <a href="qwidgetitem.html#b5c03d">QWidgetItem</a> and <a href="qgridlayout.html#9141b9">QGridLayout</a>.
<h3 class="fn">int<a name="03af08"></a>QLayoutItem::heightForWidth(int)const <code>[virtual]</code></h3>
<p>Returns the preferred height for this layout item, given the width
<em>w.</em>
<p>The default implementation returns -1, indicating that the preferred
height is independent of the width of the item.  Using the function
<a href="#27843f">hasHeightForWidth</a>() will typically be much faster than calling this
function and testing for -1.
<p>Reimplement this function in layout managers that support
height for width. A typical implementation will look like this:
<pre>  int MyLayout::heightForWidth( int w ) const
  {
      if ( cache_dirty || cached_width != w ) {
          //Not all C++ compilers support "mutable" yet:
          MyLayout * mthis = (MyLayout*)this;
          int h = calculateHeightForWidth( w );
          mthis-&gt;cached_hfw = h;
          return h;
      }
      return cached_hfw;
  }
</pre>
<p>Caching is strongly recommended, without it layout will take
exponential time.
<p>See also  <a href="#27843f">hasHeightForWidth</a>().
<p>Reimplemented in <a href="qwidgetitem.html#25694c">QWidgetItem</a>, <a href="qgridlayout.html#c213e1">QGridLayout</a> and <a href="qboxlayout.html#cc3365">QBoxLayout</a>.
<h3 class="fn">void<a name="91d950"></a>QLayoutItem::invalidate() <code>[virtual]</code></h3>
<p>Invalidates any cached information in this layout item.
<p>Reimplemented in <a href="qgridlayout.html#86ef06">QGridLayout</a>, <a href="qlayout.html#9af473">QLayout</a> and <a href="qboxlayout.html#22f03b">QBoxLayout</a>.
<h3 class="fn">virtualbool<a name="ca255b"></a>QLayoutItem::isEmpty()const <code>[virtual]</code></h3>
<p>Implemented in subclasses to return whether this item is empty,
i.e. whether it contains any widgets.
<p>Reimplemented in <a href="qwidgetitem.html#10ac3e">QWidgetItem</a>, <a href="qspaceritem.html#ea0024">QSpacerItem</a> and <a href="qlayout.html#b61308">QLayout</a>.
<h3 class="fn"><a href="qlayoutiterator.html">QLayoutIterator</a><a name="40af74"></a>QLayoutItem::iterator() <code>[virtual]</code></h3>
<p>Returns an iterator over this item's QLayoutItem children.
The default implementation returns an empty iterator.
<p>Reimplement this function in subclasses that can have
children.
<p>Reimplemented in <a href="qgridlayout.html#9b8c68">QGridLayout</a>, <a href="qlayout.html#3d3ab8">QLayout</a> and <a href="qboxlayout.html#c34aa2">QBoxLayout</a>.
<h3 class="fn"><a href="qlayout.html">QLayout</a>*<a name="902494"></a>QLayoutItem::layout() <code>[virtual]</code></h3>
<p>If this item is a <a href="qlayout.html">QLayout</a>, return it as a QLayout, otherwise return 0.
This function provides type-safe casting.
<p>Reimplemented in <a href="qlayout.html#0af322">QLayout</a>.
<h3 class="fn"><a href="qsize.html">QSize</a><a name="7c9b8e"></a>QLayoutItem::maximumSize()const <code>[virtual]</code></h3>
<p>Implemented in subclasses to return the maximum size of this item.
<p>Reimplemented in <a href="qboxlayout.html#860362">QBoxLayout</a>, <a href="qlayout.html#7a16d1">QLayout</a>, <a href="qgridlayout.html#f731ea">QGridLayout</a>, <a href="qwidgetitem.html#11d46e">QWidgetItem</a> and <a href="qspaceritem.html#9b024b">QSpacerItem</a>.
<h3 class="fn"><a href="qsize.html">QSize</a><a name="83838c"></a>QLayoutItem::minimumSize()const <code>[virtual]</code></h3>
<p>Implemented in subclasses to return the minimum size of this item.
<p>Reimplemented in <a href="qboxlayout.html#53b861">QBoxLayout</a>, <a href="qgridlayout.html#dad856">QGridLayout</a>, <a href="qlayout.html#8e1dc2">QLayout</a>, <a href="qwidgetitem.html#b61c0b">QWidgetItem</a> and <a href="qspaceritem.html#5294e1">QSpacerItem</a>.
<h3 class="fn">void<a name="06c4a7"></a>QLayoutItem::setAlignment(inta) <code>[virtual]</code></h3>
<p>Sets the alignment of this item to <em>a,</em>
which is a bitwise OR of <a href="qt.html#AlignmentFlags">Qt::AlignmentFlags</a>.
<h3 class="fn">void<a name="0c6928"></a>QLayoutItem::setGeometry(const<a href="qrect.html">QRect</a>&amp;r) <code>[virtual]</code></h3>
<p>Implemented in subclasses to set this item's geometry to <em>r.</em>
<p>Reimplemented in <a href="qboxlayout.html#95f741">QBoxLayout</a>, <a href="qlayout.html#f1f752">QLayout</a>, <a href="qgridlayout.html#e4d9b7">QGridLayout</a>, <a href="qspaceritem.html#d26460">QSpacerItem</a> and <a href="qwidgetitem.html#430c16">QWidgetItem</a>.
<h3 class="fn"><a href="qsize.html">QSize</a><a name="48b5b2"></a>QLayoutItem::sizeHint()const <code>[virtual]</code></h3>
<p>Implemented in subclasses to return the preferred size of this item.
<p>Reimplemented in <a href="qboxlayout.html#b239cc">QBoxLayout</a>, <a href="qwidgetitem.html#157d1f">QWidgetItem</a>, <a href="qspaceritem.html#b93829">QSpacerItem</a> and <a href="qgridlayout.html#81d455">QGridLayout</a>.
<h3 class="fn"><a href="qspaceritem.html">QSpacerItem</a>*<a name="238c12"></a>QLayoutItem::spacerItem() <code>[virtual]</code></h3>
<p>If this item is a <a href="qspaceritem.html">QSpacerItem</a>, return it as a QSpacerItem, otherwise
return 0.  This function provides type-safe casting.
<p>Reimplemented in <a href="qspaceritem.html#895567">QSpacerItem</a>.
<h3 class="fn"><a href="qwidget.html">QWidget</a>*<a name="618010"></a>QLayoutItem::widget() <code>[virtual]</code></h3>
<p>If this item is a <a href="qwidgetitem.html">QWidgetItem</a>, the managed widget is returned.
The default implementation returns 0;.
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