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#
6# RCS: @(#) $Id$
7
8if {![info exists widgetDemo]} {
9    error "This script should be run from the \"widget\" demo."
10}
11
12package require Tk
13
14# loadDir --
15# This procedure reloads the directory listbox from the directory
16# named in the demo's entry.
17#
18# Arguments:
19# w -			Name of the toplevel window of the demo.
20
21proc loadDir w {
22    global dirName
23
24    $w.f.list delete 0 end
25    foreach i [lsort [glob -type f -directory $dirName *]] {
26	$w.f.list insert end [file tail $i]
27    }
28}
29
30# selectAndLoadDir --
31# This procedure pops up a dialog to ask for a directory to load into
32# the listobx and (if the user presses OK) reloads the directory
33# listbox from the directory named in the demo's entry.
34#
35# Arguments:
36# w -			Name of the toplevel window of the demo.
37
38proc selectAndLoadDir w {
39    global dirName
40    set dir [tk_chooseDirectory -initialdir $dirName -parent $w -mustexist 1]
41    if {[string length $dir] != 0} {
42	set dirName $dir
43	loadDir $w
44    }
45}
46
47# loadImage --
48# Given the name of the toplevel window of the demo and the mouse
49# position, extracts the directory entry under the mouse and loads
50# that file into a photo image for display.
51#
52# Arguments:
53# w -			Name of the toplevel window of the demo.
54# x, y-			Mouse position within the listbox.
55
56proc loadImage {w x y} {
57    global dirName
58
59    set file [file join $dirName [$w.f.list get @$x,$y]]
60    if {[catch {
61	image2a configure -file $file
62    }]} then {
63	# Mark the file as not loadable
64	$w.f.list itemconfigure @$x,$y -bg \#c00000 -selectbackground \#ff0000
65    }
66}
67
68set w .image2
69catch {destroy $w}
70toplevel $w
71wm title $w "Image Demonstration #2"
72wm iconname $w "Image2"
73positionWindow $w
74
75label $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."
76pack $w.msg -side top
77
78## See Code / Dismiss buttons
79set btns [addSeeDismiss $w.buttons $w]
80pack $btns -side bottom -fill x
81
82frame $w.mid
83pack $w.mid -fill both -expand 1
84
85labelframe $w.dir -text "Directory:"
86# Main widget program sets variable tk_demoDirectory
87set dirName [file join $tk_demoDirectory images]
88entry $w.dir.e -width 30 -textvariable dirName
89button $w.dir.b -pady 0 -padx 2m -text "Select Dir." \
90	-command "selectAndLoadDir $w"
91bind $w.dir.e <Return> "loadDir $w"
92pack $w.dir.e -side left -fill both -padx 2m     -pady 2m -expand true
93pack $w.dir.b -side left -fill y    -padx {0 2m} -pady 2m
94labelframe $w.f -text "File:" -padx 2m -pady 2m
95
96listbox $w.f.list -width 20 -height 10 -yscrollcommand "$w.f.scroll set"
97scrollbar $w.f.scroll -command "$w.f.list yview"
98pack $w.f.list $w.f.scroll -side left -fill y -expand 1
99$w.f.list insert 0 earth.gif earthris.gif teapot.ppm
100bind $w.f.list <Double-1> "loadImage $w %x %y"
101
102catch {image delete image2a}
103image create photo image2a
104labelframe $w.image -text "Image:"
105label $w.image.image -image image2a
106pack $w.image.image -padx 2m -pady 2m
107
108grid $w.dir -        -sticky ew -padx 1m -pady 1m -in $w.mid
109grid $w.f   $w.image -sticky nw -padx 1m -pady 1m -in $w.mid
110grid columnconfigure $w.mid 1 -weight 1
111