| | 1 | # text.tcl -- |
| | 2 | # |
| | 3 | # This file contains Tcl procedures used to manage Tk entries. |
| | 4 | # |
| | 5 | # $Header: /user6/ouster/wish/scripts/RCS/text.tcl,v 1.2 92/07/16 16:26:33 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 when dragging one end of the selection. |
| | 18 | # The arguments are the text window name and the index of the character |
| | 19 | # that is to be the new end of the selection. |
| | 20 | |
| | 21 | proc tk_textSelectTo {w index} { |
| | 22 | global tk_priv |
| | 23 | |
| | 24 | case $tk_priv(selectMode) { |
| | 25 | char { |
| | 26 | if [$w compare $index < anchor] { |
| | 27 | set first $index |
| | 28 | set last anchor |
| | 29 | } else { |
| | 30 | set first anchor |
| | 31 | set last [$w index $index+1c] |
| | 32 | } |
| | 33 | } |
| | 34 | word { |
| | 35 | if [$w compare $index < anchor] { |
| | 36 | set first [$w index "$index wordstart"] |
| | 37 | set last [$w index "anchor wordend"] |
| | 38 | } else { |
| | 39 | set first [$w index "anchor wordstart"] |
| | 40 | set last [$w index "$index wordend"] |
| | 41 | } |
| | 42 | } |
| | 43 | line { |
| | 44 | if [$w compare $index < anchor] { |
| | 45 | set first [$w index "$index linestart"] |
| | 46 | set last [$w index "anchor lineend + 1c"] |
| | 47 | } else { |
| | 48 | set first [$w index "anchor linestart"] |
| | 49 | set last [$w index "$index lineend + 1c"] |
| | 50 | } |
| | 51 | } |
| | 52 | } |
| | 53 | $w tag remove sel 0.0 $first |
| | 54 | $w tag add sel $first $last |
| | 55 | $w tag remove sel $last end |
| | 56 | } |
| | 57 | |
| | 58 | # The procedure below is invoked to backspace over one character in |
| | 59 | # a text widget. The name of the widget is passed as argument. |
| | 60 | |
| | 61 | proc tk_textBackspace w { |
| | 62 | $w delete insert-1c insert |
| | 63 | } |
| | 64 | |
| | 65 | # The procedure below compares three indices, a, b, and c. Index b must |
| | 66 | # be less than c. The procedure returns 1 if a is closer to b than to c, |
| | 67 | # and 0 otherwise. The "w" argument is the name of the text widget in |
| | 68 | # which to do the comparison. |
| | 69 | |
| | 70 | proc tk_textIndexCloser {w a b c} { |
| | 71 | set a [$w index $a] |
| | 72 | set b [$w index $b] |
| | 73 | set c [$w index $c] |
| | 74 | if [$w compare $a <= $b] { |
| | 75 | return 1 |
| | 76 | } |
| | 77 | if [$w compare $a >= $c] { |
| | 78 | return 0 |
| | 79 | } |
| | 80 | scan $a "%d.%d" lineA chA |
| | 81 | scan $b "%d.%d" lineB chB |
| | 82 | scan $c "%d.%d" lineC chC |
| | 83 | if {$chC == 0} { |
| | 84 | incr lineC -1 |
| | 85 | set chC [string length [$w get $lineC.0 $lineC.end]] |
| | 86 | } |
| | 87 | if {$lineB != $lineC} { |
| | 88 | return [expr {($lineA-$lineB) < ($lineC-$lineA)}] |
| | 89 | } |
| | 90 | return [expr {($chA-$chB) < ($chC-$chA)}] |
| | 91 | } |
| | 92 | |
| | 93 | # The procedure below is called to reset the selection anchor to |
| | 94 | # whichever end is FARTHEST from the index argument. |
| | 95 | |
| | 96 | proc tk_textResetAnchor {w index} { |
| | 97 | global tk_priv |
| | 98 | if {[$w tag ranges sel] == ""} { |
| | 99 | set tk_priv(selectMode) char |
| | 100 | $w mark set anchor $index |
| | 101 | return |
| | 102 | } |
| | 103 | if [tk_textIndexCloser $w $index sel.first sel.last] { |
| | 104 | if {$tk_priv(selectMode) == "char"} { |
| | 105 | $w mark set anchor sel.last |
| | 106 | } else { |
| | 107 | $w mark set anchor sel.last-1c |
| | 108 | } |
| | 109 | } else { |
| | 110 | $w mark set anchor sel.first |
| | 111 | } |
| | 112 | } |
projects / micropolis / blame_incremental