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  if {![info exists widgetDemo]} {
  7      error "This script should be run from the \"widget\" demo."
  8  }
  9  
 10  package 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  
 19  proc 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  
 36  proc selectAndLoadDir w {
 37      global dirName
 38      set dir [tk_chooseDirectory -initialdir $dirName -parent $w -mustexist 1]
 39      if {$dir ne ""} {
 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  
 54  proc 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  
 66  set w .image2
 67  catch {destroy $w}
 68  toplevel $w
 69  wm title $w "Image Demonstration #2"
 70  wm iconname $w "Image2"
 71  positionWindow $w
 72  
 73  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."
 74  pack $w.msg -side top
 75  
 76  ## See Code / Dismiss buttons
 77  set btns [addSeeDismiss $w.buttons $w]
 78  pack $btns -side bottom -fill x
 79  
 80  frame $w.mid
 81  pack $w.mid -fill both -expand 1
 82  
 83  labelframe $w.dir -text "Directory:"
 84  # Main widget program sets variable tk_demoDirectory
 85  set dirName [file join $tk_demoDirectory images]
 86  entry $w.dir.e -width 30 -textvariable dirName
 87  button $w.dir.b -pady 0 -padx 2m -text "Select Dir." \
 88  	-command "selectAndLoadDir $w"
 89  bind $w.dir.e <Return> "loadDir $w"
 90  pack $w.dir.e -side left -fill both -padx 2m     -pady 2m -expand true
 91  pack $w.dir.b -side left -fill y    -padx {0 2m} -pady 2m
 92  labelframe $w.f -text "File:" -padx 2m -pady 2m
 93  
 94  listbox $w.f.list -width 20 -height 10 -yscrollcommand "$w.f.scroll set"
 95  ttk::scrollbar $w.f.scroll -command "$w.f.list yview"
 96  pack $w.f.list $w.f.scroll -side left -fill y -expand 1
 97  $w.f.list insert 0 earth.gif earthris.gif teapot.ppm
 98  bind $w.f.list <Double-Button-1> "loadImage $w %x %y"
 99  
100  catch {image delete image2a}
101  image create photo image2a
102  labelframe $w.image -text "Image:"
103  label $w.image.image -image image2a
104  pack $w.image.image -padx 2m -pady 2m
105  
106  grid $w.dir -        -sticky ew -padx 1m -pady 1m -in $w.mid
107  grid $w.f   $w.image -sticky nw -padx 1m -pady 1m -in $w.mid
108  grid columnconfigure $w.mid 1 -weight 1