NAME

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

CLASS HIERARCHY

Curses::UI::Searchable - base class

SYNOPSIS

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 ....
}

DESCRIPTION

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:

• make it a descendant of Curses::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.

• -ypos data member

  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).

• bindings for searchroutines

  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' , '?');

SEE ALSO

Curses::UI, Curses::UI::SearchEntry,

AUTHOR

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

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.