indexing

	description: 
		"Implementation of XPropertyEvent.";
	status: "See notice at end of class.";
	date: "$Date$";
	revision: "$Revision$"

class
	MEL_PROPERTY_EVENT

inherit

	MEL_EVENT

create
	make

feature -- Access

    time: INTEGER is
            -- Time when property was changed?
        do
            Result := c_event_time (handle)
        end;

	atom: MEL_ATOM is
			-- Name of property involved
        do
			create Result.make_from_existing (c_event_atom (handle));
		ensure
			result_not_void: Result /= Void
        end;

	state: INTEGER is
			-- State of Event
		do
            Result := c_event_state (handle)
		ensure
			valid_result: is_property_new_value or else
				is_property_delete
		end;

	is_property_new_value: BOOLEAN is
			-- Is `state' value set to PropertyNewValue?
		do
			Result := state = PropertyNewValue
		end;	

	is_property_delete: BOOLEAN is
			-- Is `state' value set to PropertyDelete?
		do
			Result := state = PropertyDelete
		end;	

feature {NONE} -- Implementation

	c_event_time (event_ptr: POINTER): INTEGER is
		external
			"C [macro %"events.h%"] (XPropertyEvent *): EIF_INTEGER"
		end;

	c_event_state (event_ptr: POINTER): INTEGER is
		external
			"C [macro %"events.h%"] (XPropertyEvent *): EIF_INTEGER"
		end;

	c_event_atom (event_ptr: POINTER): POINTER is
		external
			"C [macro %"events.h%"] (XPropertyEvent *): EIF_POINTER"
		end;

end -- class MEL_PROPERTY_EVENT


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