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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 }
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