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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
25proc 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
40proc 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
54proc 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
69proc 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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