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.\" ========================================================================
.\"
.IX Title "Tickit::SingleChildWidget 3pm"
.TH Tickit::SingleChildWidget 3pm "2020-11-04" "perl v5.30.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
"Tickit::SingleChildWidget" \- abstract base class for widgets that contain a
single other widget
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& TODO
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This subclass of Tickit::ContainerWidget acts as an abstract base class for
widgets that contain exactly one other widget. It enforces that only one child
widget may be contained at any one time, and provides a convenient accessor to
obtain it.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.SS "new"
.IX Subsection "new"
.Vb 1
\&   $widget = Tickit::SingleChildWidget\->new( %args )
.Ve
.PP
Constructs a new \f(CW\*(C`Tickit::SingleChildWidget\*(C'\fR object.
.PP
As a back-compatibility option if passed an argument called \f(CW\*(C`child\*(C'\fR this will
be added as the contained child widget. This is now discouraged as it
complicates the creation of subclasses; see instead the \*(L"set_child\*(R" method
used as a chaining mutator.
.SH "METHODS"
.IX Header "METHODS"
.SS "child"
.IX Subsection "child"
.Vb 1
\&   $child = $widget\->child
.Ve
.PP
Returns the contained child widget.
.SS "set_child"
.IX Subsection "set_child"
.Vb 1
\&   $widget\->set_child( $child )
.Ve
.PP
Sets the child widget, or \f(CW\*(C`undef\*(C'\fR to remove.
.PP
This method returns the container widget instance itself making it suitable to
use as a chaining mutator; e.g.
.PP
.Vb 2
\&   my $container = Tickit::SingleChildWidget\->new( ... )
\&      \->set_child( Tickit::Widget::Static\->new( ... ) );
.Ve
.PP
This should be preferred over using the \f(CW\*(C`child\*(C'\fR constructor argument, which
is now discouraged.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Evans <leonerd@leonerd.org.uk>