1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
#
# checkbutton widget demo2 (called by 'widget')
#
# delete old toplevel widget
if defined?($check2_demo) && $check2_demo
$check2_demo.destroy
$check2_demo = nil
end
# create demo toplevel widget
$check2_demo = TkToplevel.new {|w|
title("Checkbutton Demonstration 2")
iconname("check2")
positionWindow(w)
}
base_frame = TkFrame.new($check2_demo).pack(:fill=>:both, :expand=>true)
# label
msg = TkLabel.new(base_frame) {
font $font
wraplength '4i'
justify 'left'
text "Four checkbuttons are displayed below. If you click on a button, it will toggle the button's selection state and set a Tcl variable to a value indicating the state of the checkbutton. The first button also follows the state of the other three. If only some of the three are checked, the first button will display the tri-state mode. Click the \"See Variables\" button to see the current values of the variables."
}
msg.pack('side'=>'top')
# variable
safety = TkVariable.new(0)
wipers = TkVariable.new(0)
brakes = TkVariable.new(0)
sober = TkVariable.new(0)
# frame
TkFrame.new(base_frame) {|frame|
TkGrid(TkFrame.new(frame, :height=>2, :relief=>:sunken, :bd=>2),
:columnspan=>4, :row=>0, :sticky=>'ew', :pady=>2)
TkGrid('x',
TkButton.new(frame, :text=>'See Variables',
:image=>$image['view'], :compound=>:left,
:command=>proc{
showVars($check2_demo,
['safety', safety], ['wipers', wipers],
['brakes', brakes], ['sober', sober])
}),
TkButton.new(frame, :text=>'See Code',
:image=>$image['view'], :compound=>:left,
:command=>proc{showCode 'check2'}),
TkButton.new(frame, :text=>'Dismiss',
:image=>$image['delete'], :compound=>:left,
:command=>proc{
tmppath = $check2_demo
$check2_demo = nil
$showVarsWin[tmppath.path] = nil
tmppath.destroy
}),
:padx=>4, :pady=>4)
frame.grid_columnconfigure(0, :weight=>1)
}.pack('side'=>'bottom', 'fill'=>'x')
# checkbutton
TkCheckButton.new(base_frame, :text=>'Safety Check', :variable=>safety,
:relief=>:flat, :onvalue=>'all', :offvalue=>'none',
:tristatevalue=>'partial'){
pack('side'=>'top', 'pady'=>2, 'anchor'=>'w')
}
[ TkCheckButton.new(base_frame, 'text'=>'Wipers OK', 'variable'=>wipers),
TkCheckButton.new(base_frame, 'text'=>'Brakes OK', 'variable'=>brakes),
TkCheckButton.new(base_frame, 'text'=>'Driver Sober', 'variable'=>sober)
].each{|w|
w.relief('flat')
w.pack('side'=>'top', 'padx'=>15, 'pady'=>2, 'anchor'=>'w')
}
# tristate check
in_check = false
tristate_check = proc{|n1,n2,op|
unless in_check
in_check = true
begin
if n1 == safety
if safety == 'none'
wipers.value = 0
brakes.value = 0
sober.value = 0
elsif safety == 'all'
wipers.value = 1
brakes.value = 1
sober.value = 1
end
else
if wipers == 1 && brakes == 1 && sober == 1
safety.value = 'all'
elsif wipers == 1 || brakes == 1 || sober == 1
safety.value = 'partial'
else
safety.value = 'none'
end
end
ensure
in_check = false
end
end
}
[wipers, brakes, sober, safety].each{|v| v.trace('w', tristate_check)}
|
