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QLayoutItem(3qt)					      QLayoutItem(3qt)

NAME
       QLayoutItem - Abstract item that a QLayout manipulates

SYNOPSIS
       #include <qlayout.h>

       Inherited by QLayout, QSpacerItem, and QWidgetItem.

   Public Members
       QLayoutItem ( int alignment = 0 )
       virtual ~QLayoutItem ()
       virtual QSize sizeHint () const = 0
       virtual QSize minimumSize () const = 0
       virtual QSize maximumSize () const = 0
       virtual QSizePolicy::ExpandData expanding () const = 0
       virtual void setGeometry ( const QRect & r ) = 0
       virtual QRect geometry () const = 0
       virtual bool isEmpty () const = 0
       virtual bool hasHeightForWidth () const
       virtual int heightForWidth ( int w ) const
       virtual void invalidate ()
       virtual QWidget * widget ()
       virtual QLayoutIterator iterator ()
       virtual QLayout * layout ()
       virtual QSpacerItem * spacerItem ()
       int alignment () const
       virtual void setAlignment ( int a )

DESCRIPTION
       The QLayoutItem class provides an abstract item that a QLayout
       manipulates.

       This is used by custom layouts.

       Pure virtual functions are provided to return information about the
       layout, including, sizeHint(), minimumSize(), maximumSize() and
       expanding().

       The layout's geometry can be set and retrieved with setGeometry() and
       geometry(), and its alignment with setAlignment() and alignment().

       isEmpty() returns whether the layout is empty. iterator() returns an
       iterator for the layout's children. If the concrete item is a QWidget,
       it can be retrieved using widget(). Similarly for layout() and
       spacerItem().

       See also QLayout, Widget Appearance and Style, and Layout Management.

MEMBER FUNCTION DOCUMENTATION
QLayoutItem::QLayoutItem ( int alignment = 0 )
       Constructs a layout item with an alignment that is a bitwise OR of the
       Qt::AlignmentFlags. Not all subclasses support alignment.

QLayoutItem::~QLayoutItem () [virtual]
       Destroys the QLayoutItem.

int QLayoutItem::alignment () const
       Returns the alignment of this item.

QSizePolicy::ExpandData QLayoutItem::expanding () const [pure virtual]
       Implemented in subclasses to return the direction(s) this item" wants"
       to expand in (if any).

       Reimplemented in QLayout, QSpacerItem, and QWidgetItem.

QRect QLayoutItem::geometry () const [pure virtual]
       Returns the rectangle covered by this layout item.

       Example: customlayout/border.cpp.

bool QLayoutItem::hasHeightForWidth () const [virtual]
       Returns TRUE if this layout's preferred height depends on its width;
       otherwise returns FALSE. The default implementation returns FALSE.

       Reimplement this function in layout managers that support height for
       width.

       See also heightForWidth() and QWidget::heightForWidth().

       Examples:

       Reimplemented in QGridLayout and QBoxLayout.

int QLayoutItem::heightForWidth ( int w ) const [virtual]
       Returns the preferred height for this layout item, given the width w.

       The default implementation returns -1, indicating that the preferred
       height is independent of the width of the item. Using the function
       hasHeightForWidth() will typically be much faster than calling this
       function and testing for -1.

       Reimplement this function in layout managers that support height for
       width. A typical implementation will look like this:

	       int MyLayout::heightForWidth( int w ) const
	       {
		   if ( cache_dirty || cached_width != w ) {
		       // not all C++ compilers support "mutable"
		       MyLayout *that = (MyLayout*)this;
		       int h = calculateHeightForWidth( w );
		       that->cached_hfw = h;
		       return h;
		   }
		   return cached_hfw;
	       }

       Caching is strongly recommended; without it layout will take
       exponential time.

       See also hasHeightForWidth().

       Example: customlayout/flow.cpp.

       Reimplemented in QGridLayout and QBoxLayout.

void QLayoutItem::invalidate () [virtual]
       Invalidates any cached information in this layout item.

       Reimplemented in QLayout.

bool QLayoutItem::isEmpty () const [pure virtual]
       Implemented in subclasses to return whether this item is empty, i.e.
       whether it contains any widgets.

       Reimplemented in QLayout, QSpacerItem, and QWidgetItem.

QLayoutIterator QLayoutItem::iterator () [virtual]
       Returns an iterator over this item's QLayoutItem children. The default
       implementation returns an empty iterator.

       Reimplement this function in subclasses that can have children.

       Reimplemented in QLayout.

QLayout * QLayoutItem::layout () [virtual]
       If this item is a QLayout, it is returned as a QLayout; otherwise 0 is
       returned. This function provides type-safe casting.

QSize QLayoutItem::maximumSize () const [pure virtual]
       Implemented in subclasses to return the maximum size of this item.

       Reimplemented in QLayout, QSpacerItem, and QWidgetItem.

QSize QLayoutItem::minimumSize () const [pure virtual]
       Implemented in subclasses to return the minimum size of this item.

       Examples:

       Reimplemented in QLayout, QSpacerItem, and QWidgetItem.

void QLayoutItem::setAlignment ( int a ) [virtual]
       Sets the alignment of this item to a, which is a bitwise OR of the
       Qt::AlignmentFlags. Not all subclasses support alignment.

       Example: chart/optionsform.cpp.

void QLayoutItem::setGeometry ( const QRect & r ) [pure virtual]
       Implemented in subclasses to set this item's geometry to r.

       Examples:

       Reimplemented in QLayout, QSpacerItem, and QWidgetItem.

QSize QLayoutItem::sizeHint () const [pure virtual]
       Implemented in subclasses to return the preferred size of this item.

       Examples:

       Reimplemented in QSpacerItem, QWidgetItem, QGridLayout, and QBoxLayout.

QSpacerItem * QLayoutItem::spacerItem () [virtual]
       If this item is a QSpacerItem, it is returned as a QSpacerItem;
       otherwise 0 is returned. This function provides type-safe casting.

QWidget * QLayoutItem::widget () [virtual]
       If this item is a QWidget, it is returned as a QWidget; otherwise 0 is
       returned. This function provides type-safe casting.

       Reimplemented in QWidgetItem.

SEE ALSO
       http://doc.trolltech.com/qlayoutitem.html
       http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
       license file included in the distribution for a complete license
       statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to
       help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is
       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users
       who prefer man pages, although this format is not officially supported
       by Trolltech.

       If you find errors in this manual page, please report them to qt-
       bugs@trolltech.com.  Please include the name of the manual page
       (qlayoutitem.3qt) and the Qt version (3.3.8).

Trolltech AS			2 February 2007		      QLayoutItem(3qt)
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