From: Valen Onish <valenonish@...>
Date: 2007-06-26T20:44:06+09:00
Subject: Ruby/Tk - simple task that I'm srtuck

I have:
1. $lb_1 = TkLabel.new(root){..}       - label
2. bt_toss=TkButton.new(root){..}      - button

I want when I press the button:         1. label's background is changed
to blue
                                        2. display changed  label's
background
                                        3. sleep(0.5)
                                        4. label's background is changed
to green
                                        5. display changed  label's
background

but I see only the last colour.

here the code:

require 'tk'

root = TkRoot.new { title "Ruby/Tk  Example" }

$lb_1 = TkLabel.new(root){
background "red"
foreground "blue"
text "Your area"
font "system,12"
place('relx'=>0.4, 'rely'=>0.08)
}

bt_toss=TkButton.new(root){
text "Toss"
command proc{change_colour}
place('relx'=>0.2, 'rely'=>0.78)
}

def change_colour
  $lb_1.configure('background'=>'blue')
  sleep(0.5)
  $lb_1.configure('background'=>'green')
  sleep(0.5)
  $lb_1.configure('background'=>'gray')

end

Tk.mainloop

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