1# image2.tcl --
2#
3# This demonstration script creates a simple collection of widgets
4# that allow you to select and view images in a Tk label.
5
6if {![info exists widgetDemo]} {
7    error "This script should be run from the \"widget\" demo."
8}
9
10package require Tk
11
12# loadDir --
13# This procedure reloads the directory listbox from the directory
14# named in the demo's entry.
15#
16# Arguments:
17# w -			Name of the toplevel window of the demo.
18
19proc loadDir w {
20    global dirName
21
22    $w.f.list delete 0 end
23    foreach i [lsort [glob -type f -directory $dirName *]] {
24	$w.f.list insert end [file tail $i]
25    }
26}
27
28# selectAndLoadDir --
29# This procedure pops up a dialog to ask for a directory to load into
30# the listobx and (if the user presses OK) reloads the directory
31# listbox from the directory named in the demo's entry.
32#
33# Arguments:
34# w -			Name of the toplevel window of the demo.
35
36proc selectAndLoadDir w {
37    global dirName
38    set dir [tk_chooseDirectory -initialdir $dirName -parent $w -mustexist 1]
39    if {[string length $dir] != 0} {
40	set dirName $dir
41	loadDir $w
42    }
43}
44
45# loadImage --
46# Given the name of the toplevel window of the demo and the mouse
47# position, extracts the directory entry under the mouse and loads
48# that file into a photo image for display.
49#
50# Arguments:
51# w -			Name of the toplevel window of the demo.
52# x, y-			Mouse position within the listbox.
53
54proc loadImage {w x y} {
55    global dirName
56
57    set file [file join $dirName [$w.f.list get @$x,$y]]
58    if {[catch {
59	image2a configure -file $file
60    }]} then {
61	# Mark the file as not loadable
62	$w.f.list itemconfigure @$x,$y -bg \#c00000 -selectbackground \#ff0000
63    }
64}
65
66set w .image2
67catch {destroy $w}
68toplevel $w
69wm title $w "Image Demonstration #2"
70wm iconname $w "Image2"
71positionWindow $w
72
73label $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."
74pack $w.msg -side top
75
76## See Code / Dismiss buttons
77set btns [addSeeDismiss $w.buttons $w]
78pack $btns -side bottom -fill x
79
80frame $w.mid
81pack $w.mid -fill both -expand 1
82
83labelframe $w.dir -text "Directory:"
84# Main widget program sets variable tk_demoDirectory
85set dirName [file join $tk_demoDirectory images]
86entry $w.dir.e -width 30 -textvariable dirName
87button $w.dir.b -pady 0 -padx 2m -text "Select Dir." \
88	-command "selectAndLoadDir $w"
89bind $w.dir.e <Return> "loadDir $w"
90pack $w.dir.e -side left -fill both -padx 2m     -pady 2m -expand true
91pack $w.dir.b -side left -fill y    -padx {0 2m} -pady 2m
92labelframe $w.f -text "File:" -padx 2m -pady 2m
93
94listbox $w.f.list -width 20 -height 10 -yscrollcommand "$w.f.scroll set"
95scrollbar $w.f.scroll -command "$w.f.list yview"
96pack $w.f.list $w.f.scroll -side left -fill y -expand 1
97$w.f.list insert 0 earth.gif earthris.gif teapot.ppm
98bind $w.f.list <Double-1> "loadImage $w %x %y"
99
100catch {image delete image2a}
101image create photo image2a
102labelframe $w.image -text "Image:"
103label $w.image.image -image image2a
104pack $w.image.image -padx 2m -pady 2m
105
106grid $w.dir -        -sticky ew -padx 1m -pady 1m -in $w.mid
107grid $w.f   $w.image -sticky nw -padx 1m -pady 1m -in $w.mid
108grid columnconfigure $w.mid 1 -weight 1
109