Curses::UI::Searchable - Add 'less'-like search abilities to a widget

       Copyright (c) 2001-2002 Maurice Makaay. All rights reserved.

       Maintained by Marcus Thiesen (marcus@cpan.thiesenweb.de)

       This package is free software and is provided "as is" without express or  implied  warranty.  It  may  be
       used, redistributed and/or modified under the same terms as perl itself.

perl v5.32.0                                       2021-01-01                        Curses::UI::Searchable(3pm)

        Curses::UI::Searchable - base class

       Using Curses::UI::Searchable, you can add 'less'-like search capabilities to your widget.

       To make your widget searchable using this class, your widget should meet the following requirements:

       •   makeitadescendantofCurses::UI::Searchable

           All  methods  for searching are in Curses::UI::Searchable.  By making your class a descendant of this
           class, these methods are automatically inherited.

       •   -yposdatamember

           The current vertical position in the widget should be identified by $this->{-ypos}.  This  y-position
           is the index of the line of content. Here's an example for a Listbox widget.

            -ypos
              |
              v
                  +------+
              0   |One   |
              1   |Two   |
              2   |Three |
                  +------+

       •   method:number_of_lines()

           Your  widget  class  should have a method number_of_lines, which returns the total number of lines in
           the widget's content. So in the example above, this method would return the value 3.

       •   method:getline_at_ypos(YPOS)

           Your widget class should have a method getline_at_ypos, which returns the line of  content  at  -ypos
           YPOS.  So in the example above, this method would return the value "Two" for YPOS = 1.

       •   method:layout_content()

           The  search  routines  will  set  the  -ypos  of your widget if a match is found for the given search
           string. Your layout_content routine should make sure that the line of content at -ypos will  be  made
           visible if the draw method is called.

       •   method:draw()

           If the search routines find a match, $this->{-search_highlight} will be set to the -ypos for the line
           on  which the match was found. If no match was found $this->{-search_highlight} will be undefined. If
           you want a matching line to be highlighted, in your widget, you can use this data member to do so (an
           example of a widget that uses this option is the Curses::UI::TextViewer widget).

       •   bindingsforsearchroutines

           There are two search routines. These are search_forward and search_backward. These have to be  called
           in  order  to  display  the  search prompt. The best way to do this is by creating bindings for them.
           Here's an example which will make '/' a forward search and '?' a backward search:

               $this->set_routine('search-forward'  , \&search_forward);
               $this->set_binding('search-forward'  , '/');
               $this->set_routine('search-backward' , \&search_backward);
               $this->set_binding('search-backward' , '?');

       Curses::UI::Searchable - Add 'less'-like search abilities to a widget

       Curses::UI,

           package MyWidget;

           use Curses::UI::Searchable;
           use vars qw(@ISA);
           @ISA = qw(Curses::UI::Searchable);

           ....

           sub new () {
               # Create class instance $this.
               ....

               $this->set_routine('search-forward', \&search_forward);
               $this->set_binding('search-forward', '/');
               $this->set_routine('search-backward', \&search_backward);
               $this->set_binding('search-backward', '?');
           }

           sub layout_content() {
               my $this = shift;

               # Layout your widget's content.
               ....

               return $this;
           }

           sub number_of_lines() {
               my $this = shift;

               # Return the number of lines in
               # the widget's content.
               return ....
           }

           sub getline_at_ypos($;) {
               my $this = shift;
               my $ypos = shift;

               # Return the content on the line
               # where ypos = $ypos
               return ....
           }