NAME

       term::interact::pager - Terminal widget, paging

SYNOPSIS

       package require Tcl  8.4

       package require term::interact::pager  ?0.1?

       term::interact::pager object text ?options...?

       object interact

       object done

       object clear

       object text text

       object configure

       object configure option

       object configure option value...

       object cget option

_________________________________________________________________________________________________

DESCRIPTION

       This package provides a class for the creation of a simple paging text display.

CLASS API

       The  package  exports  a single command, the class command, enabling the creation of pager
       instances. Its API is:

       term::interact::pager object text ?options...?
              This command creates a new pager object with the name object, initializes  it,  and
              returns the fully qualified name of the object command as its result.

              The  argument  is  the text to show, possibly followed by configuration options and
              their values. The options are explained in the section Configuration.

OBJECT API

       The objects created by the class command provide the methods listed below:

       object interact
              Show the pager in the screen at the configured location and start interacting  with
              it.  This  opens  its own event loop for the processing of incoming characters. The
              method returns when the interaction has completed. See section  Interaction  for  a
              description of the possible interaction.

       object done
              This  method can be used by user supplied actions to terminate the interaction with
              the object.

       object clear
              This method can be used by user supplied actions  to  remove  the  pager  from  the
              terminal.

       object text text
              This  method  can  be  used  to change the text shown by the pager.  The pager will
              reset the dispay to show the first line of the text at the top.

       object configure

       object configure option

       object configure option value...

       object cget option
              Standard methods to retrieve and configure the options of the pager.

CONFIGURATION

       A pager instance recognizes the following options:

       -in chan
              Specifies the channel to read character sequences from. Defaults to stdin.

       -out chan
              Specifies the channel to write the pager contents to. Defaults to stdout.

       -column int
              Specifies the column of the terminal where the left margin  of  the  pager  display
              should appear. Defaults to 0, i.e. the left-most column.

       -line int
              Specifies the line of the terminal where the top margin of the pager display should
              appear. Defaults to 0, i.e. the top-most line.

       -height int
              Specifies the number of lines of text to show at most in the display.  Defaults  to
              25.

       -actions dict
              Specifies  a dictionary containing additional actions, using character sequences as
              keys. Note that these sequences cannot override the hardwired  sequences  described
              in section Interaction.

INTERACTION

       A  pager  object  recognizes the control sequences listed below and acts as described. The
       user can supply more control sequences to act on via the configuration, but is not able to
       overide these defaults.

       Cursor Up
              The  text  is scrolled down a single line, making one more line visible at the top.
              The pager will not react if the first line of the text is already shown.

       Cursor Down
              The text is scrolled up a single line, making one more line visible at the  bottom.
              The pager will not react if the last line of the text is already shown.

       Page Up
              The text is scrolled down a page. The pager will not react if the first line of the
              text is already shown.

       Page Down
              The text is scrolled up a page. The pager will not react if the last  line  of  the
              text is already shown.

       Enter/Return
              The interaction with the object is terminated.

BUGS, IDEAS, FEEDBACK

       This  document,  and  the  package  it  describes, will undoubtedly contain bugs and other
       problems.   Please  report  such  in  the   category   term   of   the   Tcllib   Trackers
       [http://core.tcl.tk/tcllib/reportlist].  Please also report any ideas for enhancements you
       may have for either package and/or documentation.

KEYWORDS

       control, pager, terminal, text display

CATEGORY

       Terminal control

COPYRIGHT

       Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>