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# image2.tcl --
#
# This demonstration script creates a simple collection of widgets
# that allow you to select and view images in a Tk label.
#
# SCCS: @(#) image2.tcl 1.9 97/03/02 16:24:48
if {![info exists widgetDemo]} {
error "This script should be run from the \"widget\" demo."
}
# loadDir --
# This procedure reloads the directory listbox from the directory
# named in the demo's entry.
#
# Arguments:
# w - Name of the toplevel window of the demo.
proc loadDir w {
global dirName
$w.f.list delete 0 end
foreach i [lsort [glob [file join $dirName *]]] {
$w.f.list insert end [file tail $i]
}
}
# loadImage --
# Given the name of the toplevel window of the demo and the mouse
# position, extracts the directory entry under the mouse and loads
# that file into a photo image for display.
#
# Arguments:
# w - Name of the toplevel window of the demo.
# x, y- Mouse position within the listbox.
proc loadImage {w x y} {
global dirName
set file [file join $dirName [$w.f.list get @$x,$y]]
image2a configure -file $file
}
set w .image2
catch {destroy $w}
toplevel $w
wm title $w "Image Demonstration #2"
wm iconname $w "Image2"
positionWindow $w
label $w.msg -font $font -wraplength 4i -justify left -text "This demonstration allows you to view images using a Tk \"photo\" image. First type a directory name in the listbox, then type Return to load the directory into the listbox. Then double-click on a file name in the listbox to see that image."
pack $w.msg -side top
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
label $w.dirLabel -text "Directory:"
set dirName [file join $tk_library demos images]
entry $w.dirName -width 30 -textvariable dirName
bind $w.dirName <Return> "loadDir $w"
frame $w.spacer1 -height 3m -width 20
label $w.fileLabel -text "File:"
frame $w.f
pack $w.dirLabel $w.dirName $w.spacer1 $w.fileLabel $w.f -side top -anchor w
listbox $w.f.list -width 20 -height 10 -yscrollcommand "$w.f.scroll set"
scrollbar $w.f.scroll -command "$w.f.list yview"
pack $w.f.list $w.f.scroll -side left -fill y -expand 1
$w.f.list insert 0 earth.gif earthris.gif teapot.ppm
bind $w.f.list <Double-1> "loadImage $w %x %y"
catch {image delete image2a}
image create photo image2a
frame $w.spacer2 -height 3m -width 20
label $w.imageLabel -text "Image:"
label $w.image -image image2a
pack $w.spacer2 $w.imageLabel $w.image -side top -anchor w
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