From: Thomas Sondergaard <tsondergaard@...>
Date: 2002-03-11T00:56:22+09:00
Subject: Fiddling with ruby/tk canvas

I've got a TkCanvas with a number of TkcImage items on it. I've set it
up (with canvas.itembind) so a TkMenu is popped up, when the user
right-clicks one of my TkcImage items, but I need to figure out which
item in the canvas I got the mouseclick event from, and I don't know how
to do that.

Here's some code. I'd like to know what I should ask the TkComm::Event
instance I get in the proc below, to have it tell me what item I
right-clicked.

canvas = TkCanvas.new

canvasImg2 = TkcImage.new(canvas, 200, 200, 'image'=>image)
canvasImg2.addtag 'bingopoint'

canvas.itembind('bingopoint', 'ButtonPress-3', 
		proc { |e| puts "get canvasImg2 instance from e, but how?" })


I've spend a few hours now with ruby/tk, and I really miss some
documentation. My pick axe book tells me that the best documentation for
ruby/tk is probably a book about perl/tk. Is this still so? Is the perl
book (Learning Perl/Tk: Graphical User Interfaces with Perl) actually a
reliable reference/tutorial for ruby/tk?

Cheers,

Thomas