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1 # entry.tcl --
2 #
3 # This file contains Tcl procedures used to manage Tk entries.
4 #
5 # $Header: /user6/ouster/wish/scripts/RCS/entry.tcl,v 1.2 92/05/23 16:40:57 ouster Exp $ SPRITE (Berkeley)
6 #
7 # Copyright 1992 Regents of the University of California
8 # Permission to use, copy, modify, and distribute this
9 # software and its documentation for any purpose and without
10 # fee is hereby granted, provided that this copyright
11 # notice appears in all copies. The University of California
12 # makes no representations about the suitability of this
13 # software for any purpose. It is provided "as is" without
14 # express or implied warranty.
15 #
16
17 # The procedure below is invoked to backspace over one character
18 # in an entry widget. The name of the widget is passed as argument.
19
20 proc tk_entryBackspace w {
21 set x [expr {[$w index cursor] - 1}]
22 if {$x != -1} {$w delete $x}
23 }
24
25 # The procedure below is invoked to backspace over one word in an
26 # entry widget. The name of the widget is passed as argument.
27
28 proc tk_entryBackword w {
29 set string [$w get]
30 set curs [expr [$w index cursor]-1]
31 if {$curs < 0} return
32 for {set x $curs} {$x > 0} {incr x -1} {
33 if {([string first [string index $string $x] " \t"] < 0)
34 && ([string first [string index $string [expr $x-1]] " \t"]
35 >= 0)} {
36 break
37 }
38 }
39 $w delete $x $curs
40 }
41
42 # The procedure below is invoked after insertions. If the caret is not
43 # visible in the window then the procedure adjusts the entry's view to
44 # bring the caret back into the window again.
45
46 proc tk_entrySeeCaret w {
47 set c [$w index cursor]
48 set left [$w index @0]
49 if {$left > $c} {
50 $w view $c
51 return
52 }
53 while {[$w index @[expr [winfo width $w]-5]] < $c} {
54 set left [expr $left+1]
55 $w view $left
56 }
57 }
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