From: David Bailey <david.bailey@...>
Date: 2006-04-03T01:25:46+09:00
Subject: Placing Sets of Ruby/Tk Widgets

After a whole day of frustrating "experimentation" with no good results, 
I was ready to give up and ask this question:

How do I place two vertical sets of widgets (inside of a left and right 
frame), two horizontal set of widgets (inside of a top and bottom frame) 
and one set of rectanges in a square grid (inside of a middle center 
canvas in a middle center frame) to control the location of my "sets"?

But then I got angry (both with myself and Ruby/Tk) and became 
determined to figure it out without asking.

It took me hours and hours, but I fainally "nailed" it!  The source of 
my frustration was not realizing that the (:x,:y) coordinates were 
relative to the parent widgets' origin (in my example these are TkRoot 
and TkFrames).

If you want to take a look (where I've use :background, :borderwidth and 
:relief options to make the frames and canvas stand out), here is the 
Ruby code:

require "tk"
root=TkRoot.new(:title=>'Ruby/Tk Geometry, Frame, Canvas, ' + \
  'and Widget Meanderings', :geometry=>'705x700')

packer1 = { :fill=>:none }

#  Note:  These (x,y) coordinates are relative to the parent widget's
#  (TkRoot's or TkFrame's) origin
placer1 = { :x=>0, :y=>0 };	placer2 = { :x=>0, :y=>600 }
placer3 = { :x=>0, :y=>40 };	placer4 = { :x=>100, :y=>100 };
placer5 = { :x=>600, :y=>100 };	placer6 = { :x=>0, :y=>100 }

topFrame = TkFrame.new(root, :width=>705, :height=>100, \
  :borderwidth=>5, :relief=>:groove, :background=>:pink).place(placer1)
topFrameButton1 = TkButton.new(topFrame, :text=>'TFButton 1').\
  place(placer1)

middleLeftFrame = TkFrame.new(root, :width=>100, :height=>500, \
  :borderwidth=>5, :relief=>:groove, :background=>:cyan).place(placer6)
middleLeftFrameButton1 = TkButton.new(middleLeftFrame, :text=>\
  'MLFButton 1').place(placer1)
middleLeftFrameButton2 = TkButton.new(middleLeftFrame, :text=>\
  'MLFButton 2').place(placer3)

middleCenterFrame = TkFrame.new(root, :width=>500, :height=>500, \
  :borderwidth=>5, :relief=>:groove, :background=>:blue).place(placer4)
middleCenterCanvas = TkCanvas.new(middleCenterFrame, :width=>477, \
  :height=>477, :borderwidth=>5, :relief=>:groove, 
:background=>:yellow).\
  pack(packer1)
middleCenterCanvasButton1 = TkButton.new(middleCenterCanvas, :text=>\
  'MCCButton 1').place(placer1)

middleRightFrame = TkFrame.new(root, :width=>105, :height=>500, \
  :borderwidth=>5, :relief=>:groove, :background=>:green).place(placer5)
middleRightFrameButton1 = TkButton.new(middleRightFrame, :text=>\
  'MRFButton 1').place(placer1)

bottomFrame = TkFrame.new(root, :width=>705, :height=>100, \
  :borderwidth=>5, :relief=>:groove, 
:background=>:orange).place(placer2)
bottomFrameButton1 = TkButton.new(bottomFrame, :text=>'BFButton 1').\
  place(placer1)

ev_quit = TkVirtualEvent.new('Control-c', 'Control-q', 'q')
Tk.root.bind(ev_quit, proc{Tk.exit}).focus
Tk.mainloop

-- 
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