note

	description: "Command to handle leave and enter actions for a focusable."
	legal: "See notice at end of class."
	status: "See notice at end of class.";
	date: "$Date$";
	revision: "$Revision$"

class FOCUS_COMMAND 

inherit

	COMMAND

create

	make

feature {NONE} -- Initialize

	make (a_focus_label: like focus_label)
			-- Set `focus_label' to `a_focus_label'.
		do
			focus_label := a_focus_label
			create delayed_focus_command.make (Current);
			create popup_timer.make;
			create popdown_timer.make
		end;

feature -- Execution

	execute (arg: FOCUSABLE)
		do
			if arg /= Void then
				if popup_timer.is_call_back_set then
					popup_timer.set_no_call_back
				end;
				if popup_timer_initialized then
					last_focusable := arg;
					focus_label.set_text (arg.focus_string);
					if popdown_timer.is_call_back_set then
						popdown_timer.set_no_call_back
					end;
				else
					popup_timer.set_next_call_back (2000, delayed_focus_command, arg);
					if popdown_timer.is_call_back_set then
						popdown_timer.set_no_call_back
					end;
				end
			else
				focus_label.reset;
				last_focusable := Void;
				if popup_timer.is_call_back_set then
					popup_timer.set_no_call_back
				end
				if not popdown_timer.is_call_back_set then
					popdown_timer.set_next_call_back (2000, delayed_focus_command, Void);
				end
			end;
		end;

feature {NONE} -- Properties

	focus_label: FOCUS_LABEL;
			-- Focus label

	last_focusable: FOCUSABLE;
			-- Last focusable

	delayed_focus_command: DELAYED_FOCUS_COMMAND;
			-- Focus command to popup the label after a certain delay.

	popup_timer: TIMER;
			-- Timer used to popup the label after a certain delay.

	popdown_timer: TIMER;
			-- Timer used to unintialize the `popup_timer'.

	popup_timer_initialized: BOOLEAN
			-- Has the `popup_timer' been initialized?
			-- Ie: Has a popup already occurred?

feature {DELAYED_FOCUS_COMMAND} -- Implementation

	popup_label (arg: FOCUSABLE)
			-- Pops up label. Requested by `delayed_focus_command'.
		do
			last_focusable := arg;
			focus_label.set_text (arg.focus_string);
			popup_timer_initialized := True
		end;

	uninitialize_timer
			-- Uninitializes the timer.
		do
			popup_timer_initialized := False;
			if popup_timer.is_call_back_set then
				popup_timer.set_no_call_back;
			end;
		end;

note
	copyright:	"Copyright (c) 1984-2006, Eiffel Software and others"
	license:	"Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
			 Eiffel Software
			 356 Storke Road, Goleta, CA 93117 USA
			 Telephone 805-685-1006, Fax 805-685-6869
			 Website http://www.eiffel.com
			 Customer support http://support.eiffel.com
		]"




end -- class FOCUS_COMMAND