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