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108 lines
3 KiB
Ruby
108 lines
3 KiB
Ruby
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#
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# checkbutton widget demo2 (called by 'widget')
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#
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# delete old toplevel widget
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if defined?($check2_demo) && $check2_demo
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$check2_demo.destroy
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$check2_demo = nil
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end
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# create demo toplevel widget
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$check2_demo = TkToplevel.new {|w|
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title("Checkbutton Demonstration 2")
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iconname("check2")
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positionWindow(w)
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}
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# label
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msg = TkLabel.new($check2_demo) {
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font $font
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wraplength '4i'
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justify 'left'
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text "Four checkbuttons are displayed below. If you click on a button, it will toggle the button's selection state and set a Tcl variable to a value indicating the state of the checkbutton. The first button also follows the state of the other three. If only some of the three are checked, the first button will display the tri-state mode. Click the \"See Variables\" button to see the current values of the variables."
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}
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msg.pack('side'=>'top')
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# variable
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safety = TkVariable.new(0)
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wipers = TkVariable.new(0)
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brakes = TkVariable.new(0)
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sober = TkVariable.new(0)
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# frame
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TkFrame.new($check2_demo) {|frame|
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TkGrid(TkFrame.new(frame, :height=>2, :relief=>:sunken, :bd=>2),
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:columnspan=>4, :row=>0, :sticky=>'ew', :pady=>2)
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TkGrid('x',
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TkButton.new(frame, :text=>'See Variables',
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:image=>$image['view'], :compound=>:left,
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:command=>proc{
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showVars($check2_demo,
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['safety', safety], ['wipers', wipers],
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['brakes', brakes], ['sober', sober])
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}),
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TkButton.new(frame, :text=>'See Code',
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:image=>$image['view'], :compound=>:left,
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:command=>proc{showCode 'check2'}),
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TkButton.new(frame, :text=>'Dismiss',
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:image=>$image['delete'], :compound=>:left,
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:command=>proc{
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tmppath = $check2_demo
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$check2_demo = nil
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$showVarsWin[tmppath.path] = nil
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tmppath.destroy
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}),
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:padx=>4, :pady=>4)
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frame.grid_columnconfigure(0, :weight=>1)
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}.pack('side'=>'bottom', 'fill'=>'x')
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# checkbutton
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TkCheckButton.new($check2_demo, :text=>'Safety Check', :variable=>safety,
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:relief=>:flat, :onvalue=>'all', :offvalue=>'none',
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:tristatevalue=>'partial'){
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pack('side'=>'top', 'pady'=>2, 'anchor'=>'w')
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}
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[ TkCheckButton.new($check2_demo, 'text'=>'Wipers OK', 'variable'=>wipers),
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TkCheckButton.new($check2_demo, 'text'=>'Brakes OK', 'variable'=>brakes),
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TkCheckButton.new($check2_demo, 'text'=>'Driver Sober', 'variable'=>sober)
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].each{|w|
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w.relief('flat')
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w.pack('side'=>'top', 'padx'=>15, 'pady'=>2, 'anchor'=>'w')
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}
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# tristate check
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in_check = false
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tristate_check = proc{|n1,n2,op|
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return if in_check
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in_check = true
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begin
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if n1 == safety
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if safety == 'none'
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wipers.value = 0
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brakes.value = 0
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sober.value = 0
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elsif safety == 'all'
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wipers.value = 1
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brakes.value = 1
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sober.value = 1
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end
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else
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if wipers == 1 && brakes == 1 && sober == 1
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safety.value = 'all'
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elsif wipers == 1 || brakes == 1 || sober == 1
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safety.value = 'partial'
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else
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safety.value = 'none'
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end
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end
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ensure
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in_check = false
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end
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}
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[wipers, brakes, sober, safety].each{|v| v.trace('w', tristate_check)}
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