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.\"
.IX Title "Tickit::Widget::Scroller::Item 3pm"
.TH Tickit::Widget::Scroller::Item 3pm "2020-06-18" "perl v5.30.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
"Tickit::Widget::Scroller::Item" \- interface for renderable scroller items
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Items added to a \f(CW\*(C`Tickit::Widget::Scroller\*(C'\fR must adhere to the interface
documented here.
.SH "METHODS"
.IX Header "METHODS"
.SS "height_for_width"
.IX Subsection "height_for_width"
.Vb 1
\&  $height = $item\->height_for_width( $width )
.Ve
.PP
Returns the number of screen lines the item would occupy if rendered to the
given width.
.SS "render"
.IX Subsection "render"
.Vb 1
\&  $item\->render( $rb, %args )
.Ve
.PP
Renders the item to the given Tickit::RenderBuffer. \f(CW%args\fR will contain
the following keys:
.IP "firstline => \s-1INT\s0" 8
.IX Item "firstline => INT"
.PD 0
.IP "lastline => \s-1INT\s0" 8
.IX Item "lastline => INT"
.PD
The (inclusive) bounds of the line numbers to render. If these do not cover
the entire height of the item, then they imply that clipping will occur; the
item need draw only the lines indicated.
.Sp
These are passed for informational purposes. Item implementations are free to
ignore this if they wish, as clipping will be performed by the RenderBuffer.
.IP "top => \s-1INT\s0" 8
.IX Item "top => INT"
The line of \f(CW$rc\fR to consider as the top of the item. This is passed for
legacy purposes and will always be zero. Item implementations are free to
ignore this value, as it will now be performed using the \f(CW\*(C`translate\*(C'\fR facility
of the RenderBuffer.
.IP "width => \s-1INT\s0" 8
.IX Item "width => INT"
.PD 0
.IP "height => \s-1INT\s0" 8
.IX Item "height => INT"
.PD
The width in columns and the height in lines to render the item. This will
correspond to the most recent call to \f(CW\*(C`height_for_width\*(C'\fR, and is passed in
for consistency and convenience of the item's render method. This is given as
the full dimensions of the item, which may be larger than the subset of lines
requested by the \f(CW\*(C`firstline\*(C'\fR and \f(CW\*(C`lastline\*(C'\fR parameters.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Evans <leonerd@leonerd.org.uk>