indexing

	status: "See notice at end of class";
	date: "$Date$";
	revision: "$Revision$"

deferred class

	SCREEN_I 

inherit

	DRAWING_I
	
feature 

	buttons: BUTTONS is
			-- Current state of the mouse buttons
		deferred
		ensure
			result_not_void: Result /= Void
		end;

	screen_object: POINTER is
			-- Screen object associated
		deferred
		end;

	widget_pointed: WIDGET is
			-- Widget currently pointed by the pointer
		deferred
		end;

	width: INTEGER is
			-- Width of screen (in pixel)
		deferred
		ensure
			width_large_enough: Result >= 0
		end;

	height: INTEGER is
			-- Height of screen (in pixel)
		deferred
		ensure
			height_large_enough: Result >= 0
		end;

	visible_width: INTEGER is
			-- Width of the visible part of the screen (in pixel)
		deferred
		ensure
			visible_width_large_enough: Result >= 0
		end;

	visible_height: INTEGER is
			-- Height of the visible part of the screen (in pixel)
		deferred
		ensure
			visible_height_large_enough: Result >= 0
		end;

	x: INTEGER is
			-- Current absolute horizontal coordinate of the mouse
		deferred
		ensure
			position_positive: Result >= 0;
			position_small_enough: Result < width
		end;

	y: INTEGER is
			-- Current absolute vertical coordinate of the mouse
		deferred
		ensure
			position_positive: Result >= 0;
			position_small_enough: Result < height
		end;

	is_valid: BOOLEAN is
			-- Is Current screen created?
		deferred
		end

end -- class SCREEN_I



--|----------------------------------------------------------------
--| EiffelVision: library of reusable components for ISE Eiffel.
--| Copyright (C) 1986-2001 Interactive Software Engineering Inc.
--| All rights reserved. Duplication and distribution prohibited.
--| May be used only with ISE Eiffel, under terms of user license. 
--| Contact ISE for any other use.
--|
--| Interactive Software Engineering Inc.
--| ISE Building
--| 360 Storke Road, Goleta, CA 93117 USA
--| Telephone 805-685-1006, Fax 805-685-6869
--| Electronic mail <info@eiffel.com>
--| Customer support: http://support.eiffel.com>
--| For latest info see award-winning pages: http://www.eiffel.com
--|----------------------------------------------------------------