 ###############################################################################
 #  Copyright 2022 Ian McIntosh <ian@openanswers.org>
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
 #  the Free Software Foundation; either version 2 of the License, or
 #  (at your option) any later version.
 #
 #  This program is distributed in the hope that it will be useful,
 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #  GNU Library General Public License for more details.
 #
 #  You should have received a copy of the GNU General Public License
 #  along with this program; if not, write to the Free Software
 #  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 ###############################################################################

require 'pathname'
require 'cairo'
require 'delegate'

class Canvas < Cairo::ImageSurface
	attr_reader :widget, :height, :width

	def initialize (window, width=100, height=100)
		super(Cairo::Format::RGB24, height, width)
		@cr = Cairo::Context.new(self)
		@parent = window
		@width = width
		@height= height

		window.signal_connect('configure-event') { |obj, event|		# Widget changed size
			@width, @height = event.width, event.height
		}

		window.signal_connect('draw') { |obj, event|							# Widget changed visibility
			@redraw_needed = false
		}
	end
end

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