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+'\" t
+.TH QLayoutItem 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
+.\" Copyright 1992-2007 Trolltech ASA.  All rights reserved.  See the
+.\" license file included in the distribution for a complete license
+.\" statement.
+.\"
+.ad l
+.nh
+.SH NAME
+QLayoutItem \- Abstract item that a QLayout manipulates
+.SH SYNOPSIS
+\fC#include <qlayout.h>\fR
+.PP
+Inherited by QLayout, QSpacerItem, and QWidgetItem.
+.PP
+.SS "Public Members"
+.in +1c
+.ti -1c
+.BI "\fBQLayoutItem\fR ( int alignment = 0 )"
+.br
+.ti -1c
+.BI "virtual \fB~QLayoutItem\fR ()"
+.br
+.ti -1c
+.BI "virtual QSize \fBsizeHint\fR () const = 0"
+.br
+.ti -1c
+.BI "virtual QSize \fBminimumSize\fR () const = 0"
+.br
+.ti -1c
+.BI "virtual QSize \fBmaximumSize\fR () const = 0"
+.br
+.ti -1c
+.BI "virtual QSizePolicy::ExpandData \fBexpanding\fR () const = 0"
+.br
+.ti -1c
+.BI "virtual void \fBsetGeometry\fR ( const QRect & r ) = 0"
+.br
+.ti -1c
+.BI "virtual QRect \fBgeometry\fR () const = 0"
+.br
+.ti -1c
+.BI "virtual bool \fBisEmpty\fR () const = 0"
+.br
+.ti -1c
+.BI "virtual bool \fBhasHeightForWidth\fR () const"
+.br
+.ti -1c
+.BI "virtual int \fBheightForWidth\fR ( int w ) const"
+.br
+.ti -1c
+.BI "virtual void \fBinvalidate\fR ()"
+.br
+.ti -1c
+.BI "virtual QWidget * \fBwidget\fR ()"
+.br
+.ti -1c
+.BI "virtual QLayoutIterator \fBiterator\fR ()"
+.br
+.ti -1c
+.BI "virtual QLayout * \fBlayout\fR ()"
+.br
+.ti -1c
+.BI "virtual QSpacerItem * \fBspacerItem\fR ()"
+.br
+.ti -1c
+.BI "int \fBalignment\fR () const"
+.br
+.ti -1c
+.BI "virtual void \fBsetAlignment\fR ( int a )"
+.br
+.in -1c
+.SH DESCRIPTION
+The QLayoutItem class provides an abstract item that a QLayout manipulates.
+.PP
+This is used by custom layouts.
+.PP
+Pure virtual functions are provided to return information about the layout, including, sizeHint(), minimumSize(), maximumSize() and expanding().
+.PP
+The layout's geometry can be set and retrieved with setGeometry() and geometry(), and its alignment with setAlignment() and alignment().
+.PP
+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().
+.PP
+See also QLayout, Widget Appearance and Style, and Layout Management.
+.SH MEMBER FUNCTION DOCUMENTATION
+.SH "QLayoutItem::QLayoutItem ( int alignment = 0 )"
+Constructs a layout item with an \fIalignment\fR that is a bitwise OR of the Qt::AlignmentFlags. Not all subclasses support alignment.
+.SH "QLayoutItem::~QLayoutItem ()\fC [virtual]\fR"
+Destroys the QLayoutItem.
+.SH "int QLayoutItem::alignment () const"
+Returns the alignment of this item.
+.SH "QSizePolicy::ExpandData QLayoutItem::expanding () const\fC [pure virtual]\fR"
+Implemented in subclasses to return the direction(s) this item" wants" to expand in (if any).
+.PP
+Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
+.SH "QRect QLayoutItem::geometry () const\fC [pure virtual]\fR"
+Returns the rectangle covered by this layout item.
+.PP
+Example: customlayout/border.cpp.
+.SH "bool QLayoutItem::hasHeightForWidth () const\fC [virtual]\fR"
+Returns TRUE if this layout's preferred height depends on its width; otherwise returns FALSE. The default implementation returns FALSE.
+.PP
+Reimplement this function in layout managers that support height for width.
+.PP
+See also heightForWidth() and QWidget::heightForWidth().
+.PP
+Examples:
+.)l customlayout/border.cpp and customlayout/flow.cpp.
+.PP
+Reimplemented in QGridLayout and QBoxLayout.
+.SH "int QLayoutItem::heightForWidth ( int w ) const\fC [virtual]\fR"
+Returns the preferred height for this layout item, given the width \fIw\fR.
+.PP
+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.
+.PP
+Reimplement this function in layout managers that support height for width. A typical implementation will look like this:
+.PP
+.nf
+.br
+        int MyLayout::heightForWidth( int w ) const
+.br
+        {
+.br
+            if ( cache_dirty || cached_width != w ) {
+.br
+                // not all C++ compilers support "mutable"
+.br
+                MyLayout *that = (MyLayout*)this;
+.br
+                int h = calculateHeightForWidth( w );
+.br
+                that->cached_hfw = h;
+.br
+                return h;
+.br
+            }
+.br
+            return cached_hfw;
+.br
+        }
+.br
+.fi
+.PP
+Caching is strongly recommended; without it layout will take exponential time.
+.PP
+See also hasHeightForWidth().
+.PP
+Example: customlayout/flow.cpp.
+.PP
+Reimplemented in QGridLayout and QBoxLayout.
+.SH "void QLayoutItem::invalidate ()\fC [virtual]\fR"
+Invalidates any cached information in this layout item.
+.PP
+Reimplemented in QLayout.
+.SH "bool QLayoutItem::isEmpty () const\fC [pure virtual]\fR"
+Implemented in subclasses to return whether this item is empty, i.e. whether it contains any widgets.
+.PP
+Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
+.SH "QLayoutIterator QLayoutItem::iterator ()\fC [virtual]\fR"
+Returns an iterator over this item's QLayoutItem children. The default implementation returns an empty iterator.
+.PP
+Reimplement this function in subclasses that can have children.
+.PP
+Reimplemented in QLayout.
+.SH "QLayout * QLayoutItem::layout ()\fC [virtual]\fR"
+If this item is a QLayout, it is returned as a QLayout; otherwise 0 is returned. This function provides type-safe casting.
+.SH "QSize QLayoutItem::maximumSize () const\fC [pure virtual]\fR"
+Implemented in subclasses to return the maximum size of this item.
+.PP
+Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
+.SH "QSize QLayoutItem::minimumSize () const\fC [pure virtual]\fR"
+Implemented in subclasses to return the minimum size of this item.
+.PP
+Examples:
+.)l customlayout/border.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
+.PP
+Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
+.SH "void QLayoutItem::setAlignment ( int a )\fC [virtual]\fR"
+Sets the alignment of this item to \fIa\fR, which is a bitwise OR of the Qt::AlignmentFlags. Not all subclasses support alignment.
+.PP
+Example: chart/optionsform.cpp.
+.SH "void QLayoutItem::setGeometry ( const QRect & r )\fC [pure virtual]\fR"
+Implemented in subclasses to set this item's geometry to \fIr\fR.
+.PP
+Examples:
+.)l customlayout/border.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
+.PP
+Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
+.SH "QSize QLayoutItem::sizeHint () const\fC [pure virtual]\fR"
+Implemented in subclasses to return the preferred size of this item.
+.PP
+Examples:
+.)l customlayout/border.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
+.PP
+Reimplemented in QSpacerItem, QWidgetItem, QGridLayout, and QBoxLayout.
+.SH "QSpacerItem * QLayoutItem::spacerItem ()\fC [virtual]\fR"
+If this item is a QSpacerItem, it is returned as a QSpacerItem; otherwise 0 is returned. This function provides type-safe casting.
+.SH "QWidget * QLayoutItem::widget ()\fC [virtual]\fR"
+If this item is a QWidget, it is returned as a QWidget; otherwise 0 is returned. This function provides type-safe casting.
+.PP
+Reimplemented in QWidgetItem.
+
+.SH "SEE ALSO"
+.BR http://doc.trolltech.com/qlayoutitem.html
+.BR http://www.trolltech.com/faq/tech.html
+.SH COPYRIGHT
+Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
+license file included in the distribution for a complete license
+statement.
+.SH AUTHOR
+Generated automatically from the source code.
+.SH BUGS
+If you find a bug in Qt, please report it as described in
+.BR http://doc.trolltech.com/bughowto.html .
+Good bug reports help us to help you. Thank you.
+.P
+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. 
+.P
+If you find errors in this manual page, please report them to
+.BR [email protected] .
+Please include the name of the manual page (qlayoutitem.3qt) and the Qt
+version (3.3.8).