git.zerfleddert.de Git - micropolis/blob - res/button.tcl

   1 # button.tcl --
   2 #
   3 # This file contains Tcl procedures used to manage Tk buttons.
   4 #
   5 # $Header: /user6/ouster/wish/scripts/RCS/button.tcl,v 1.7 92/07/28 15:41:13 ouster Exp $ SPRITE (Berkeley)
   6 #
   7 # Copyright 1992 Regents of the University of California
   8 # Permission to use, copy, modify, and distribute this
   9 # software and its documentation for any purpose and without
  10 # fee is hereby granted, provided that this copyright
  11 # notice appears in all copies.  The University of California
  12 # makes no representations about the suitability of this
  13 # software for any purpose.  It is provided "as is" without
  14 # express or implied warranty.
  15 #
  16
  17 # $tk_priv(window@$screen) keeps track of the button containing the mouse,
  18 # and $tk_priv(relief@$screen) saves the original relief of the button so
  19 # it can be restored when the mouse button is released.
  20
  21 # The procedure below is invoked when the mouse pointer enters a
  22 # button widget.  It records the button we're in and changes the
  23 # state of the button to active unless the button is disabled.
  24
  25 proc tk_butEnter w {
  26     global tk_priv
  27     set screen [winfo screen $w]
  28     if {[lindex [$w config -state] 4] != "disabled"} {
  29         $w config -state active
  30         set tk_priv(window@$screen) $w
  31     } else {
  32         set tk_priv(window@$screen) ""
  33     }
  34 }
  35
  36 # The procedure below is invoked when the mouse pointer leaves a
  37 # button widget.  It changes the state of the button back to
  38 # inactive.
  39
  40 proc tk_butLeave w {
  41     global tk_priv
  42     if {[lindex [$w config -state] 4] != "disabled"} {
  43         $w config -state normal
  44     }
  45     set screen [winfo screen $w]
  46     set tk_priv(window@$screen) ""
  47 }
  48
  49 # The procedure below is invoked when the mouse button is pressed in
  50 # a button/radiobutton/checkbutton widget.  It records information
  51 # (a) to indicate that the mouse is in the button, and
  52 # (b) to save the button's relief so it can be restored later.
  53
  54 proc tk_butDown w {
  55     global tk_priv
  56     set screen [winfo screen $w]
  57     set tk_priv(relief@$screen) [lindex [$w config -relief] 4]
  58     if {[lindex [$w config -state] 4] != "disabled"} {
  59         $w config -relief sunken
  60         update idletasks
  61     }
  62 }
  63
  64 # The procedure below is invoked when the mouse button is released
  65 # for a button/radiobutton/checkbutton widget.  It restores the
  66 # button's relief and invokes the command as long as the mouse
  67 # hasn't left the button.
  68
  69 proc tk_butUp w {
  70     global tk_priv
  71     set screen [winfo screen $w]
  72     $w config -relief $tk_priv(relief@$screen)
  73     update idletasks
  74     if {($w == $tk_priv(window@$screen))
  75             && ([lindex [$w config -state] 4] != "disabled")} {
  76         uplevel #0 [list $w invoke]
  77     }
  78 }