Provided by: tklib_0.5-3_all bug

NAME

       ntextBindings - Alternative Bindings for the Text Widget

SYNOPSIS

       package require Tcl  8.5

       package require Tk  8.5

       package require ntext  ?0.81?

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DESCRIPTION

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

       The Text binding tag provides around one hundred bindings to the text  widget  (the  exact
       number is platform-dependent).  A few of these behave in a way that is different from most
       contemporary text-editing applications.  Ntext aims to provide more familiar behaviour.

       Features of the Ntext bindings that differ from the default Text bindings:

       ·      Clicking near the end of a (logical) line moves the cursor to the end of that  line
              (not  the  start  of the next line).  If the widget is in -wrap word mode, the same
              rule applies to display lines.

       ·      Double-clicking or dragging near the end of a (logical) line will  highlight/select
              characters  from  the end of that line (not the next line, or the region at the end
              of the line where there are no characters).  If the widget is in -wrap  word  mode,
              the same rule applies to display lines.

       ·      The  End  key  implements "Smart End" (successive keypresses move the cursor to the
              end of the display line, then to the  end  of  the  logical  line);  the  Home  key
              implements  "Smart Home" (which is similar to "Smart End", but also toggles between
              the beginning and end of leading whitespace).

       ·      When a selection exists, a <<Paste>> operation (e.g.  <Control-v>)  overwrites  the
              selection (as most editors do), and does so on all platforms.

       ·      The <Insert> key toggles between "Insert" and "Overwrite" modes for keyboard input.
              (In contrast, the Text binding tag uses <Insert> as a method to paste the  "primary
              selection", a task that can be accomplished instead by mouse middle-click.)

       ·      The <Escape> key clears the selection.

       ·      Selecting  with <Shift-Button1> selects from the previous position of the insertion
              cursor. (In the Text binding tag, the selection anchor may be the position  of  the
              previous mouse click.)

       ·      <Shift-Button1>  operations do not alter the selection anchor. (In the Text binding
              tag, they do.)

       ·      By default, the Ntext binding tag does  not  provide  several  of  the  Control-key
              bindings  supplied  by  the Text binding tag.  Modern keyboards offer alternatives,
              such as cursor keys for navigation; modern applications often use  the  Control-key
              bindings for other purposes (e.g. <Control-p> for "print").

       The  last three cases, the behavior of Text is often useful, so Ntext gives you the option
       of retaining it, by setting variables defined in the ::ntext namespace to  1  (instead  of
       their default 0).  Explaining these features in more detail:

       ·      If the mouse is clicked at position A, then the keyboard is used to move the cursor
              to B, then shift is held down, and the mouse is clicked at C: the Text binding  tag
              gives  a  selection  from  A to C; the Ntext gives a selection from B to C.  If you
              want Ntext to behave like Text in this respect, set ::ntext::classicMouseSelect  to
              1.

       ·      The  Text binding tag allows successive <Shift-Button-1> events to change both ends
              of the selection, by moving the selection  anchor  to  the  end  of  the  selection
              furthest  from  the  mouse click.  Instead, the Ntext binding tag fixes the anchor,
              and multiple Shift-Button-1 events can  only  move  the  non-anchored  end  of  the
              selection.    If  you  want  Ntext  to  behave  like  Text  in  this  respect,  set
              ::ntext::classicAnchor to 1.  In both Text and Ntext, keyboard navigation with  the
              Shift key held down alters the selection and keeps the selection anchor fixed.

       ·      The  following  "extra"  Text  bindings  are  switched  off  by default, but can be
              activated in Ntext by setting ::ntext::classicExtras to 1:  <Control-a>,  <Control-
              b>,  <Control-d>,  <Control-e>, <Control-f>, <Control-h>, <Control-i>, <Control-k>,
              <Control-n>,  <Control-o>,  <Control-p>,  <Control-t>,  <Control-space>,  <Control-
              Shift-space>.

CONFIGURATION OPTIONS

       Ntext  provides  alternatives  to  a number of behaviours of the classic Text binding tag.
       Where there is an option, the Ntext behaviour  is  switched  on  by  default,  except  for
       display-line indentation which is discussed on a separate page at ntextIndent.

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

       ::ntext::classicAnchor

       ·      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

       ::ntext::classicExtras

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

       ·      1 - selects classic Text behaviour, i.e. the "extra" Text bindings are activated

       ::ntext::classicMouseSelect

       ·      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

       ::ntext::overwrite

       ·      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.

EXAMPLE

       To use Ntext but keep classic Text 's variable-anchor feature:

              package require ntext
              text .t
              set ::ntext::classicAnchor 1
              bindtags .t {.t Ntext . all}

SEE ALSO

       bindtags, ntext, ntextIndent, text

KEYWORDS

       bindtags, text