75 lines
1.4 KiB
Ruby
75 lines
1.4 KiB
Ruby
#!/usr/bin/env ruby
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# square --
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# This script generates a demo application containing only
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# a "square" widget. It's only usable if Tk has been compiled
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# with tkSquare.c and with the -DSQUARE_DEMO compiler switch.
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# This demo arranges the following bindings for the widget:
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#
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# Button-1 press/drag: moves square to mouse
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# "a": toggle size animation on/off
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#
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require 'tk'
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require 'tkafter'
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class TkSquare<TkWindow
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def create_self
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tk_call 'square', path
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end
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def size(amount=nil)
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if amount
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tk_send 'size', amount
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else
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number(tk_send 'size')
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end
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end
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def position(x,y)
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tk_send 'position', x, y
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end
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end
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$s = TkSquare.new{
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pack('expand'=>'yes', 'fill'=>'both')
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bind('1', proc{|x,y| center(x,y)}, '%s %y')
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bind('B1-Motion', proc{|x,y| center(x,y)}, '%s %y')
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bind('a', proc{animate})
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focus
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}
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TkRoot.new.minsize(1,1)
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# The procedure below centers the square on a given position.
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def center(x,y)
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a = $s.size
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$s.position(x-(a/2), y-(a/2))
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end
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# The procedures below provide a simple form of animation where
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# the box changes size in a pulsing pattern: larger, smaller, larger,
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# and so on.
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$inc = 0
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def timer_proc
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a = $s.size
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return if $inc == 0
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$inc = -3 if a >= 40
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$inc = 3 if a <= 10
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$s.size(a+$inc)
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end
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$timer = TkAfter.new(30, -1, proc{timer_proc})
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def animate
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if $inc == 0
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$inc = 3
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$timer.start
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else
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$inc = 0
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$timer.stop
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end
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end
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Tk.mainloop
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