ntext(n) Alternative Bindings for the Text Widget ntext(n)______________________________________________________________________________NAMEntext - Alternative Bindings for the Text Widget
SYNOPSIS
package require Tcl 8.5
package require Tk 8.5
package require ntext ?0.81?
_________________________________________________________________DESCRIPTION
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 behav‐
iour. 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 fur‐
ther 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 dis‐
play 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 dif‐
ferent 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 tag.
CONFIGURATION OPTIONS
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:
::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 tradi‐
tional Text bindings are de-activated
· 1 - selects classic Text behaviour, i.e. all 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 navi‐
gation
· 1 - selects classic Text behaviour
::ntext::classicWordBreak
· 0 - (default value) selects Ntext behaviour, i.e. platform-inde‐
pendent, 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 con‐
figuration options.
::ntext::classicWrap
· 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 indentation.
· 1 - (default value) selects classic Text behaviour, i.e. no
indentation
::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 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.
SEE ALSO
bindtags, ntextBindings, ntextIndent, ntextWordBreak, re_syntax, reg‐
exp, text
KEYWORDS
bindtags, re_syntax, regexp, text
ntext 0.81 ntext(n)
