mingw/lib/tk8.5/demos/hscale.tcl

   1 # hscale.tcl --
   2 #
   3 # This demonstration script shows an example with a horizontal scale.
   4
   5 if {![info exists widgetDemo]} {
   6     error "This script should be run from the \"widget\" demo."
   7 }
   8
   9 package require Tk
  10
  11 set w .hscale
  12 catch {destroy $w}
  13 toplevel $w
  14 wm title $w "Horizontal Scale Demonstration"
  15 wm iconname $w "hscale"
  16 positionWindow $w
  17
  18 label $w.msg -font $font -wraplength 3.5i -justify left -text "An arrow and a horizontal scale are displayed below.  If you click or drag mouse button 1 in the scale, you can change the length of the arrow."
  19 pack $w.msg -side top -padx .5c
  20
  21 ## See Code / Dismiss buttons
  22 set btns [addSeeDismiss $w.buttons $w]
  23 pack $btns -side bottom -fill x
  24
  25 frame $w.frame -borderwidth 10
  26 pack $w.frame -side top -fill x
  27
  28 canvas $w.frame.canvas -width 50 -height 50 -bd 0 -highlightthickness 0
  29 $w.frame.canvas create polygon 0 0 1 1 2 2 -fill DeepSkyBlue3 -tags poly
  30 $w.frame.canvas create line 0 0 1 1 2 2 0 0 -fill black -tags line
  31 scale $w.frame.scale -orient horizontal -length 284 -from 0 -to 250 \
  32         -command "setWidth $w.frame.canvas" -tickinterval 50
  33 pack $w.frame.canvas -side top -expand yes -anchor s -fill x  -padx 15
  34 pack $w.frame.scale -side bottom -expand yes -anchor n
  35 $w.frame.scale set 75
  36
  37 proc setWidth {w width} {
  38     incr width 21
  39     set x2 [expr {$width - 30}]
  40     if {$x2 < 21} {
  41         set x2 21
  42     }
  43     $w coords poly 20 15 20 35 $x2 35 $x2 45 $width 25 $x2 5 $x2 15 20 15
  44     $w coords line 20 15 20 35 $x2 35 $x2 45 $width 25 $x2 5 $x2 15 20 15
  45 }