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authorrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
committerrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
commit066ea7fd88d49cb456f74da71dbe875e4fc0aabb (patch)
tree8fb30cb152c4dc191be47fa043d2e6f5ea38c7ba /library/demos/image2.tcl
parent13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22 (diff)
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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