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#! /usr/bin/env tclsh
#==============================================================================
# Demo: wcb::callback <listbox> before activate <callback>
#
# Copyright (c) 1999-2023 Csaba Nemethi (E-mail: csaba.nemethi@t-online.de)
#==============================================================================
package require Tk
package require wcb
wm title . "Listboxtest #2"
#
# Add some entries to the Tk option database
#
source [file join [file dirname [info script]] option.tcl]
set dirName [file join [file dirname [info script]] images]
image create photo photoImage
#
# Frame .spacer and listbox .lb
#
frame .spacer -width 7p
listbox .lb -height 0 -width 0 -background white
set pattern [file join $dirName *]
##nagelfar ignore
foreach pathName [lsort [glob $pattern]] {
.lb insert end [file tail $pathName]
}
#
# Label .picture
#
label .picture -relief sunken -background white
#
# Define a before-activate callback for .lb
#
wcb::callback .lb before activate showPicture
#
# Callback procedure showPicture
#
proc showPicture {w idx} {
set leafName [$w get $idx]
#
# When traversing the listbox with the arrow keys, the value
# of idx can become -1 or the number of listbox elements,
# hence the value of leafName can be an empty string:
#
if {$leafName eq ""} {
return ""
}
global dirName
set pathName [file join $dirName $leafName]
if {[regexp {^\.(bmp|xbm)$} [file extension $pathName]]} {
.picture configure -bitmap @$pathName -image ""
} else {
.picture configure -bitmap "" -image ""
catch {
photoImage configure -file $pathName
.picture configure -bitmap "" -image photoImage
}
}
}
#
# Button .close
#
button .close -text Close -command exit
#
# Manage the widgets
#
pack .spacer .lb -side left -fill y -pady 7p
pack .close -side bottom -padx 7p -pady {0 7p}
pack .picture -padx 7p -pady 7p
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