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Diffstat (limited to 'library/demos/search.tcl')
| -rw-r--r-- | library/demos/search.tcl | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/library/demos/search.tcl b/library/demos/search.tcl new file mode 100644 index 0000000..ffefd82 --- /dev/null +++ b/library/demos/search.tcl @@ -0,0 +1,141 @@ +# search.tcl -- +# +# This demonstration script creates a collection of widgets that +# allow you to load a file into a text widget, then perform searches +# on that file. +# +# SCCS: @(#) search.tcl 1.5 97/03/02 16:27:25 + +if {![info exists widgetDemo]} { + error "This script should be run from the \"widget\" demo." +} + +# textLoadFile -- +# This procedure below loads a file into a text widget, discarding +# the previous contents of the widget. Tags for the old widget are +# not affected, however. +# +# Arguments: +# w - The window into which to load the file. Must be a +# text widget. +# file - The name of the file to load. Must be readable. + +proc textLoadFile {w file} { + set f [open $file] + $w delete 1.0 end + while {![eof $f]} { + $w insert end [read $f 10000] + } + close $f +} + +# textSearch -- +# Search for all instances of a given string in a text widget and +# apply a given tag to each instance found. +# +# Arguments: +# w - The window in which to search. Must be a text widget. +# string - The string to search for. The search is done using +# exact matching only; no special characters. +# tag - Tag to apply to each instance of a matching string. + +proc textSearch {w string tag} { + $w tag remove search 0.0 end + if {$string == ""} { + return + } + set cur 1.0 + while 1 { + set cur [$w search -count length $string $cur end] + if {$cur == ""} { + break + } + $w tag add $tag $cur "$cur + $length char" + set cur [$w index "$cur + $length char"] + } +} + +# textToggle -- +# This procedure is invoked repeatedly to invoke two commands at +# periodic intervals. It normally reschedules itself after each +# execution but if an error occurs (e.g. because the window was +# deleted) then it doesn't reschedule itself. +# +# Arguments: +# cmd1 - Command to execute when procedure is called. +# sleep1 - Ms to sleep after executing cmd1 before executing cmd2. +# cmd2 - Command to execute in the *next* invocation of this +# procedure. +# sleep2 - Ms to sleep after executing cmd2 before executing cmd1 again. + +proc textToggle {cmd1 sleep1 cmd2 sleep2} { + catch { + eval $cmd1 + after $sleep1 [list textToggle $cmd2 $sleep2 $cmd1 $sleep1] + } +} + +set w .search +catch {destroy $w} +toplevel $w +wm title $w "Text Demonstration - Search and Highlight" +wm iconname $w "search" +positionWindow $w + +frame $w.buttons +pack $w.buttons -side bottom -fill x -pady 2m +button $w.buttons.dismiss -text Dismiss -command "destroy $w" +button $w.buttons.code -text "See Code" -command "showCode $w" +pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 + +frame $w.file +label $w.file.label -text "File name:" -width 13 -anchor w +entry $w.file.entry -width 40 -textvariable fileName +button $w.file.button -text "Load File" \ + -command "textLoadFile $w.text \$fileName" +pack $w.file.label $w.file.entry -side left +pack $w.file.button -side left -pady 5 -padx 10 +bind $w.file.entry <Return> " + textLoadFile $w.text \$fileName + focus $w.string.entry +" +focus $w.file.entry + +frame $w.string +label $w.string.label -text "Search string:" -width 13 -anchor w +entry $w.string.entry -width 40 -textvariable searchString +button $w.string.button -text "Highlight" \ + -command "textSearch $w.text \$searchString search" +pack $w.string.label $w.string.entry -side left +pack $w.string.button -side left -pady 5 -padx 10 +bind $w.string.entry <Return> "textSearch $w.text \$searchString search" + +text $w.text -yscrollcommand "$w.scroll set" -setgrid true +scrollbar $w.scroll -command "$w.text yview" +pack $w.file $w.string -side top -fill x +pack $w.scroll -side right -fill y +pack $w.text -expand yes -fill both + +# Set up display styles for text highlighting. + +if {[winfo depth $w] > 1} { + textToggle "$w.text tag configure search -background \ + #ce5555 -foreground white" 800 "$w.text tag configure \ + search -background {} -foreground {}" 200 +} else { + textToggle "$w.text tag configure search -background \ + black -foreground white" 800 "$w.text tag configure \ + search -background {} -foreground {}" 200 +} +$w.text insert 1.0 \ +{This window demonstrates how to use the tagging facilities in text +widgets to implement a searching mechanism. First, type a file name +in the top entry, then type <Return> or click on "Load File". Then +type a string in the lower entry and type <Return> or click on +"Load File". This will cause all of the instances of the string to +be tagged with the tag "search", and it will arrange for the tag's +display attributes to change to make all of the strings blink.} +$w.text mark set insert 0.0 + +set fileName "" +set searchString "" |