qlayout.html

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<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#x1362">customlayout/border.cpp</a> and <a href="customlayout-example.html#x1339">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
this layout's children.
<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#x1363">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1383">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1340">customlayout/flow.cpp</a>.
<p>Reimplemented from <a href="qlayoutitem.html#iterator">QLayoutItem</a>.
<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <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>&nbsp;* <a name="menuBar"></a>QLayout::menuBar () const
</h3>

<p> Returns the menu bar set for this layout, or 0 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#x1364">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1384">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1341">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&nbsp;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#x1927">i18n/main.cpp</a>.
<h3 class=fn>void <a name="setEnabled"></a>QLayout::setEnabled ( bool&nbsp;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&nbsp;<a href="qrect.html">QRect</a>&nbsp;&amp;&nbsp;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#x1365">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1385">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1342">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>&nbsp;*&nbsp;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#x490">layout/layout.cpp</a> and <a href="scrollview-example.html#x718">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&nbsp;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>().
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