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109 lines
3.3 KiB
109 lines
3.3 KiB
6 years ago
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# image2.tcl --
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#
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# This demonstration script creates a simple collection of widgets
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# that allow you to select and view images in a Tk label.
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if {![info exists widgetDemo]} {
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error "This script should be run from the \"widget\" demo."
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}
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package require Tk
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# loadDir --
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# This procedure reloads the directory listbox from the directory
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# named in the demo's entry.
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#
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# Arguments:
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# w - Name of the toplevel window of the demo.
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proc loadDir w {
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global dirName
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$w.f.list delete 0 end
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foreach i [lsort [glob -type f -directory $dirName *]] {
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$w.f.list insert end [file tail $i]
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}
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}
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# selectAndLoadDir --
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# This procedure pops up a dialog to ask for a directory to load into
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# the listobx and (if the user presses OK) reloads the directory
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# listbox from the directory named in the demo's entry.
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#
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# Arguments:
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# w - Name of the toplevel window of the demo.
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proc selectAndLoadDir w {
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global dirName
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set dir [tk_chooseDirectory -initialdir $dirName -parent $w -mustexist 1]
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if {$dir ne ""} {
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set dirName $dir
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loadDir $w
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}
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}
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# loadImage --
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# Given the name of the toplevel window of the demo and the mouse
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# position, extracts the directory entry under the mouse and loads
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# that file into a photo image for display.
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#
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# Arguments:
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# w - Name of the toplevel window of the demo.
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# x, y- Mouse position within the listbox.
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proc loadImage {w x y} {
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global dirName
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set file [file join $dirName [$w.f.list get @$x,$y]]
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if {[catch {
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image2a configure -file $file
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}]} then {
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# Mark the file as not loadable
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$w.f.list itemconfigure @$x,$y -bg \#c00000 -selectbackground \#ff0000
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}
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}
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set w .image2
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catch {destroy $w}
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toplevel $w
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wm title $w "Image Demonstration #2"
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wm iconname $w "Image2"
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positionWindow $w
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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."
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pack $w.msg -side top
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## See Code / Dismiss buttons
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set btns [addSeeDismiss $w.buttons $w]
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pack $btns -side bottom -fill x
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frame $w.mid
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pack $w.mid -fill both -expand 1
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labelframe $w.dir -text "Directory:"
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# Main widget program sets variable tk_demoDirectory
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set dirName [file join $tk_demoDirectory images]
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entry $w.dir.e -width 30 -textvariable dirName
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button $w.dir.b -pady 0 -padx 2m -text "Select Dir." \
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-command "selectAndLoadDir $w"
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bind $w.dir.e <Return> "loadDir $w"
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pack $w.dir.e -side left -fill both -padx 2m -pady 2m -expand true
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pack $w.dir.b -side left -fill y -padx {0 2m} -pady 2m
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labelframe $w.f -text "File:" -padx 2m -pady 2m
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listbox $w.f.list -width 20 -height 10 -yscrollcommand "$w.f.scroll set"
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ttk::scrollbar $w.f.scroll -command "$w.f.list yview"
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pack $w.f.list $w.f.scroll -side left -fill y -expand 1
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$w.f.list insert 0 earth.gif earthris.gif teapot.ppm
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bind $w.f.list <Double-1> "loadImage $w %x %y"
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catch {image delete image2a}
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image create photo image2a
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labelframe $w.image -text "Image:"
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label $w.image.image -image image2a
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pack $w.image.image -padx 2m -pady 2m
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grid $w.dir - -sticky ew -padx 1m -pady 1m -in $w.mid
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grid $w.f $w.image -sticky nw -padx 1m -pady 1m -in $w.mid
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grid columnconfigure $w.mid 1 -weight 1
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