ntextBindings(3tk)				     Alternative Bindings for the Text Widget					ntextBindings(3tk)

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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:

       o      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.

       o      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.

       o      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).

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

       o      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.)

       o      The <Escape> key clears the selection.

       o      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.)

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

       o      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:

       o      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.

       o      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-But-
	      ton-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.

       o      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

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

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

       ::ntext::classicExtras

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

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

       ::ntext::classicMouseSelect

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

       o      1 - selects classic Text behaviour

       ::ntext::overwrite

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

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

       o      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

ntext								       0.81							ntextBindings(3tk)