Provided by: tklib_0.5-3_all bug


       ntext - Alternative Bindings for the Text Widget


       package require Tcl  8.5

       package require Tk  8.5

       package require ntext  ?0.81?



       The  purpose  of the ntext package is to make the text widget behave more like other text-
       editing applications. It makes the text widget more useful for implementing a text editor,
       and makes it behave in a way that will be more familiar to most users.

       The  package  provides  a  binding tag named Ntext for use by text widgets in place of the
       default Text binding tag.

       Package ntext 's functions and variables are contained entirely in the ::ntext  namespace;
       its  other code is contained in the binding tag Ntext.  ntext has no exports to the global
       or other namespaces, and no new widget commands.  It uses modified copies of the Tk  code,
       leaving the original code, and the Text binding tag, unchanged.

       The  differences  between  the  Ntext  binding tag and the default Text binding tag are in
       three categories:

       ·      Some Text bindings behave differently from most text-editing  applications.   Ntext
              gives these bindings more familiar behaviour.  For details see ntextBindings.

       ·      When  a  logical  line  with  leading whitespace is word-wrapped onto more than one
              display line, the wrapped display lines begin further to the left  than  the  first
              display  line,  which can make the text layout untidy and difficult to read.  Ntext
              can indent the wrapped lines to match the leading whitespace of the  first  display
              line (this facility is switched off by default).  For details see ntextIndent.

       ·      When  the  user  navigates  or  selects text, Tcl/Tk sometimes needs to detect word
              boundaries.  Ntext provides  improved  rules  for  word  boundary  detection.   For
              details see ntextWordBreak.

       The  remainder of this page describes the basic use and configuration of all three aspects
       of Ntext.  For more detailed information on the different facilities  of  Ntext,  see  the
       pages ntextBindings, ntextIndent, and ntextWordBreak.

       See  Section  EXAMPLE  for how to apply the Ntext binding tag in place of the Text binding


       Ntext provides alternatives to a number of behaviours of the  classic  Text  binding  tag.
       Where  there  is  an  option, the Ntext behaviour (except for display-line indentation) is
       switched on by default.

       The behaviour of Ntext may be configured application-wide  by  setting  the  values  of  a
       number of namespace variables:


       ·      0 - (default value) selects Ntext behaviour, i.e. the anchor point is fixed

       ·      1 - selects classic Text behaviour, i.e. the anchor point is variable


       ·      0 - (default value) selects Ntext behaviour, i.e. several traditional Text bindings
              are de-activated

       ·      1 - selects classic Text behaviour, i.e. all Text bindings are activated


       ·      0 - (default value) selects Ntext  behaviour,  i.e.  the  anchor  point  for  mouse
              selection operations is moved by keyboard navigation

       ·      1 - selects classic Text behaviour


       ·      0 - (default value) selects Ntext behaviour, i.e. platform-independent, two classes
              of word characters and one class of non-word characters.

       ·      1 - selects classic Text behaviour, i.e.  platform-dependent,  one  class  of  word
              characters and one class of non-word characters

       ·      After  changing  this  value,  the  matching  patterns should be recalculated.  See
              ntextWordBreak for details and advanced configuration options.


       ·      0 - selects Ntext behaviour, i.e. display lines of text widgets in -wrap word  mode
              are indented to match the initial whitespace of the first display line of a logical
              line.  If the widget already holds text when this value is set, a function call may
              be  necessary.   See  ntextIndent  for detailed instructions on the use of Ntext 's

       ·      1 - (default value) selects classic Text behaviour, i.e. no indentation


       ·      0 - (initial value) text typed at the keyboard is inserted into the widget

       ·      1 - text typed at the keyboard overwrites text already in the widget

       ·      The value is toggled by the Insert key.


       To create a text widget .t and use the Ntext bindings:

              package require ntext
              text .t
              bindtags .t {.t Ntext . all}

       See bindtags for more information.


       bindtags, ntextBindings, ntextIndent, ntextWordBreak, re_syntax, regexp, text


       bindtags, re_syntax, regexp, text