lib/tk8.4/demos/search.tcl

   1 # search.tcl --
   2 #
   3 # This demonstration script creates a collection of widgets that
   4 # allow you to load a file into a text widget, then perform searches
   5 # on that file.
   6 #
   7 # RCS: @(#) $Id: search.tcl,v 1.2 1998/09/14 18:23:30 stanton Exp $
   8
   9 if {![info exists widgetDemo]} {
  10     error "This script should be run from the \"widget\" demo."
  11 }
  12
  13 # textLoadFile --
  14 # This procedure below loads a file into a text widget, discarding
  15 # the previous contents of the widget. Tags for the old widget are
  16 # not affected, however.
  17 #
  18 # Arguments:
  19 # w -           The window into which to load the file.  Must be a
  20 #               text widget.
  21 # file -        The name of the file to load.  Must be readable.
  22
  23 proc textLoadFile {w file} {
  24     set f [open $file]
  25     $w delete 1.0 end
  26     while {![eof $f]} {
  27         $w insert end [read $f 10000]
  28     }
  29     close $f
  30 }
  31
  32 # textSearch --
  33 # Search for all instances of a given string in a text widget and
  34 # apply a given tag to each instance found.
  35 #
  36 # Arguments:
  37 # w -           The window in which to search.  Must be a text widget.
  38 # string -      The string to search for.  The search is done using
  39 #               exact matching only;  no special characters.
  40 # tag -         Tag to apply to each instance of a matching string.
  41
  42 proc textSearch {w string tag} {
  43     $w tag remove search 0.0 end
  44     if {$string == ""} {
  45         return
  46     }
  47     set cur 1.0
  48     while 1 {
  49         set cur [$w search -count length $string $cur end]
  50         if {$cur == ""} {
  51             break
  52         }
  53         $w tag add $tag $cur "$cur + $length char"
  54         set cur [$w index "$cur + $length char"]
  55     }
  56 }
  57
  58 # textToggle --
  59 # This procedure is invoked repeatedly to invoke two commands at
  60 # periodic intervals.  It normally reschedules itself after each
  61 # execution but if an error occurs (e.g. because the window was
  62 # deleted) then it doesn't reschedule itself.
  63 #
  64 # Arguments:
  65 # cmd1 -        Command to execute when procedure is called.
  66 # sleep1 -      Ms to sleep after executing cmd1 before executing cmd2.
  67 # cmd2 -        Command to execute in the *next* invocation of this
  68 #               procedure.
  69 # sleep2 -      Ms to sleep after executing cmd2 before executing cmd1 again.
  70
  71 proc textToggle {cmd1 sleep1 cmd2 sleep2} {
  72     catch {
  73         eval $cmd1
  74         after $sleep1 [list textToggle $cmd2 $sleep2 $cmd1 $sleep1]
  75     }
  76 }
  77
  78 set w .search
  79 catch {destroy $w}
  80 toplevel $w
  81 wm title $w "Text Demonstration - Search and Highlight"
  82 wm iconname $w "search"
  83 positionWindow $w
  84
  85 frame $w.buttons
  86 pack $w.buttons -side bottom -fill x -pady 2m
  87 button $w.buttons.dismiss -text Dismiss -command "destroy $w"
  88 button $w.buttons.code -text "See Code" -command "showCode $w"
  89 pack $w.buttons.dismiss $w.buttons.code -side left -expand 1
  90
  91 frame $w.file
  92 label $w.file.label -text "File name:" -width 13 -anchor w
  93 entry $w.file.entry -width 40 -textvariable fileName
  94 button $w.file.button -text "Load File" \
  95         -command "textLoadFile $w.text \$fileName"
  96 pack $w.file.label $w.file.entry -side left
  97 pack $w.file.button -side left -pady 5 -padx 10
  98 bind $w.file.entry <Return> "
  99     textLoadFile $w.text \$fileName
 100     focus $w.string.entry
 101 "
 102 focus $w.file.entry
 103
 104 frame $w.string
 105 label $w.string.label -text "Search string:" -width 13 -anchor w
 106 entry $w.string.entry -width 40 -textvariable searchString
 107 button $w.string.button -text "Highlight" \
 108         -command "textSearch $w.text \$searchString search"
 109 pack $w.string.label $w.string.entry -side left
 110 pack $w.string.button -side left -pady 5 -padx 10
 111 bind $w.string.entry <Return> "textSearch $w.text \$searchString search"
 112
 113 text $w.text -yscrollcommand "$w.scroll set" -setgrid true
 114 scrollbar $w.scroll -command "$w.text yview"
 115 pack $w.file $w.string -side top -fill x
 116 pack $w.scroll -side right -fill y
 117 pack $w.text -expand yes -fill both
 118
 119 # Set up display styles for text highlighting.
 120
 121 if {[winfo depth $w] > 1} {
 122     textToggle "$w.text tag configure search -background \
 123             #ce5555 -foreground white" 800 "$w.text tag configure \
 124             search -background {} -foreground {}" 200
 125 } else {
 126     textToggle "$w.text tag configure search -background \
 127             black -foreground white" 800 "$w.text tag configure \
 128             search -background {} -foreground {}" 200
 129 }
 130 $w.text insert 1.0 \
 131 {This window demonstrates how to use the tagging facilities in text
 132 widgets to implement a searching mechanism.  First, type a file name
 133 in the top entry, then type <Return> or click on "Load File".  Then
 134 type a string in the lower entry and type <Return> or click on
 135 "Load File".  This will cause all of the instances of the string to
 136 be tagged with the tag "search", and it will arrange for the tag's
 137 display attributes to change to make all of the strings blink.}
 138 $w.text mark set insert 0.0
 139
 140 set fileName ""
 141 set searchString ""