indexing
	description: "Eiffel Vision application. Implementation interface.%NSee ev_application.e"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	keywords: "application"
	date: "$Date: 2008-02-14 02:30:05 -0800 (Thu, 14 Feb 2008) $"
	revision: "$Revision: 72306 $"

deferred class interface
	EV_APPLICATION_I


feature -- Access

	alt_pressed: BOOLEAN
			-- Is alt key currently pressed?

	c_memory: INTEGER_32 is 2
			-- Code for the C memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	caps_lock_on: BOOLEAN
			-- Is the Caps Lock key currently on?

	captured_widget: EV_WIDGET
			-- Widget currently captured. Void if none.

	check_instruction: INTEGER_32 is 7
			-- Exception code for violated check
			-- (from EXCEP_CONST)

	class_invariant: INTEGER_32 is 6
			-- Exception code for violated class invariant
			-- (from EXCEP_CONST)

	clipboard: EV_CLIPBOARD
			-- Native platform clipboard access.

	com_exception: INTEGER_32 is 28
			-- Exception code for a COM error.
			-- (from EXCEP_CONST)

	contextual_help_accelerator: EV_ACCELERATOR
			-- Accelerator that enables contextual help mode

	create_on_deferred: INTEGER_32 is 17
			-- Create on deferred
			-- (from EXCEP_CONST)

	ctrl_pressed: BOOLEAN
			-- Is ctrl key currently pressed?

	developer_exception: INTEGER_32 is 24
			-- Exception code for developer exception
			-- (from EXCEP_CONST)

	dollar_applied_to_melted_feature: INTEGER_32 is 26
			-- $ applied to melted feature
			-- (from EXCEP_CONST)

	eiffel_memory: INTEGER_32 is 1
			-- Code for the Eiffel memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	eiffel_runtime_fatal_error: INTEGER_32 is 25
			-- Eiffel run-time fatal error
			-- (from EXCEP_CONST)

	eiffel_runtime_panic: INTEGER_32 is 13
			-- Eiffel run-time panic
			-- (from EXCEP_CONST)

	exception_in_signal_handler: INTEGER_32 is 20
			-- Exception in signal handler
			-- (from EXCEP_CONST)

	exception_manager: EXCEPTION_MANAGER
			-- Exception manager
			-- (from EXCEPTION_MANAGER_FACTORY)
		ensure -- from EXCEPTION_MANAGER_FACTORY
			exception_manager_not_void: Result /= Void

	external_exception: INTEGER_32 is 18
			-- Exception code for operating system error
			-- which does not set the `errno' variable
			-- (Unix-specific)
			-- (from EXCEP_CONST)

	floating_point_exception: INTEGER_32 is 5
			-- Exception code for floating point exception
			-- (from EXCEP_CONST)

	full_collector: INTEGER_32 is 0
			-- Statistics for full collections
			-- (from MEM_CONST)

	generating_type: STRING_8
			-- Name of current object's generating type
			-- (type of which it is a direct instance)
			-- (from ANY)
		ensure -- from ANY
			generating_type_not_void: Result /= Void
			generating_type_not_empty: not Result.is_empty

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty

	help_accelerator: EV_ACCELERATOR
			-- Accelerator that displays contextual help

	help_engine: EV_HELP_ENGINE
			-- Object that handle contextual help display requests

	incorrect_inspect_value: INTEGER_32 is 9
			-- Exception code for inspect value which is not one
			-- of the inspect constants, if there is no Else_part
			-- (from EXCEP_CONST)

	incremental_collector: INTEGER_32 is 1
			-- Statistics for incremental collections
			-- (from MEM_CONST)

	invoke_garbage_collection_when_inactive: BOOLEAN
			-- Should garbage collection be invoked when application is inactive.

	io_exception: INTEGER_32 is 21
			-- Exception code for I/O error
			-- (from EXCEP_CONST)

	is_display_remote: BOOLEAN
			-- Is application display remote?
			-- This function is primarily to determine if drawing to the display is optimal.

	locked_window: EV_WINDOW
			-- Window currently locked. Void if no window
			-- is currently locked.
			--
			-- See `{EV_WINDOW}.lock_update' for more details

	loop_invariant: INTEGER_32 is 11
			-- Exception code for violated loop invariant
			-- (from EXCEP_CONST)

	loop_variant: INTEGER_32 is 10
			-- Exception code for non-decreased loop variant
			-- (from EXCEP_CONST)

	no_more_memory: INTEGER_32 is 2
			-- Exception code for failed memory allocation
			-- (from EXCEP_CONST)

	number_of_codes: INTEGER_32 is 31
			-- How many codes are there to represent exceptions?
			-- (from EXCEP_CONST)

	old_exception: INTEGER_32 is 30
			-- Old exception code.
			-- (from EXCEP_CONST)

	operating_system_exception: INTEGER_32 is 22
			-- Exception code for operating system error
			-- which sets the `errno' variable
			-- (Unix-specific)
			-- (from EXCEP_CONST)

	out_of_memory: INTEGER_32 is 15
			-- Out of memory (cannot be ignored)
			-- (from EXCEP_CONST)

	pick_and_drop_source: EV_PICK_AND_DROPABLE_I
			-- The current pick and drop source.

	pnd_targets: HASH_TABLE [INTEGER_32, INTEGER_32]
			-- Global list of pick and drop target object ids.

	postcondition: INTEGER_32 is 4
			-- Exception code for violated postcondition
			-- (from EXCEP_CONST)

	precondition: INTEGER_32 is 3
			-- Exception code for violated precondition
			-- (from EXCEP_CONST)

	rescue_exception: INTEGER_32 is 14
			-- Exception code for exception in rescue clause
			-- (from EXCEP_CONST)

	resumption_failed: INTEGER_32 is 16
			-- Resumption failed (retry did not succeed)
			-- (from EXCEP_CONST)

	retrieve_exception: INTEGER_32 is 23
			-- Exception code for retrieval error
			-- may be raised by `retrieved' in `IO_MEDIUM'.
			-- (from EXCEP_CONST)

	routine_failure: INTEGER_32 is 8
			-- Exception code for failed routine
			-- (from EXCEP_CONST)

	runtime_check_exception: INTEGER_32 is 29
			-- Exception code for runtime check being violated.
			-- (from EXCEP_CONST)

	runtime_io_exception: INTEGER_32 is 27
			-- Exception code for I/O error raised by runtime functions
			-- such as store/retrieve, file access...
			-- (from EXCEP_CONST)

	serialization_exception: INTEGER_32 is 31
			-- Serialization exception code.
			-- (from EXCEP_CONST)

	shift_pressed: BOOLEAN
			-- Is shift key currently pressed?

	signal_exception: INTEGER_32 is 12
			-- Exception code for operating system signal
			-- (from EXCEP_CONST)

	total_memory: INTEGER_32 is 0
			-- Code for all the memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	transport_in_progress: BOOLEAN
			-- Is a Pick and Drop transport currently in progress?

	valid_code (c: INTEGER_32): BOOLEAN
			-- Is `c' a valid code to represent some kind of exceptions?
			-- (from EXCEP_CONST)

	void_assigned_to_expanded: INTEGER_32 is 19
			-- Exception code for assignment of void value
			-- to expanded entity
			-- (from EXCEP_CONST)

	void_call_target: INTEGER_32 is 1
			-- Exception code for feature applied to void reference
			-- (from EXCEP_CONST)

	windows: LINEAR [EV_WINDOW]
			-- Global list of windows.
	
feature -- Measurement

	gc_statistics (collector_type: INTEGER_32): GC_INFO
			-- Garbage collection information for `collector_type'.
			-- (from MEMORY)
		require -- from MEMORY
			type_ok: collector_type = full_collector or collector_type = incremental_collector

	memory_statistics (memory_type: INTEGER_32): MEM_INFO
			-- Memory usage information for `memory_type'
			-- (from MEMORY)
		require -- from MEMORY
			type_ok: memory_type = total_memory or memory_type = eiffel_memory or memory_type = c_memory
	
feature -- Comparison

	frozen deep_equal (some: ?ANY; other: like arg #1): BOOLEAN
			-- Are `some' and `other' either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		ensure -- from ANY
			shallow_implies_deep: standard_equal (some, other) implies Result
			both_or_none_void: (some = Void) implies (Result = (other = Void))
			same_type: (Result and (some /= Void)) implies (other /= Void and then some.same_type (other))
			symmetric: Result implies deep_equal (other, some)

	frozen equal (some: ?ANY; other: like arg #1): BOOLEAN
			-- Are `some' and `other' either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		ensure -- from ANY
			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))

	frozen is_deep_equal (other: EV_APPLICATION_I): BOOLEAN
			-- Are `Current' and `other' attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)

	is_equal (other: EV_APPLICATION_I): BOOLEAN
			-- Is `other' attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			symmetric: Result implies other.is_equal (Current)
			consistent: standard_is_equal (other) implies Result

	frozen standard_equal (some: ?ANY; other: like arg #1): BOOLEAN
			-- Are `some' and `other' either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		ensure -- from ANY
			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))

	frozen standard_is_equal (other: EV_APPLICATION_I): BOOLEAN
			-- Is `other' attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
	
feature -- Status report

	assertion_violation: BOOLEAN
			-- Is last exception originally due to a violated
			-- assertion or non-decreasing variant?
			-- (from EXCEPTIONS)

	chunk_size: INTEGER_32
			-- Minimal size of a memory chunk. The run-time always
			-- allocates a multiple of this size.
			-- If the environment variable EIF_MEMORY_CHUNK
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)

	class_name: ?STRING_8
			-- Name of the class that includes the recipient
			-- of original form of last exception
			-- (from EXCEPTIONS)

	coalesce_period: INTEGER_32
			-- Period of full coalesce (in number of collections)
			-- If the environment variable EIF_FULL_COALESCE_PERIOD
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- If null, no full coalescing is launched.
			-- (from MEMORY)

	collecting: BOOLEAN
			-- Is garbage collection enabled?
			-- (from MEMORY)

	collection_period: INTEGER_32
			-- Period of full collection.
			-- If the environment variable EIF_FULL_COLLECTION_PERIOD
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- If null, no full collection is launched.
			-- (from MEMORY)

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of `other' (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void

	developer_exception_name: ?STRING_8
			-- Name of last developer-raised exception
			-- (from EXCEPTIONS)
		require -- from EXCEPTIONS
			applicable: is_developer_exception

	exception: INTEGER_32
			-- Code of last exception that occurred
			-- (from EXCEPTIONS)

	exception_trace: ?STRING_8
			-- String representation of the exception trace
			-- (from EXCEPTIONS)

	focused_widget: EV_WIDGET
			-- Widget with keyboard focus

	generation_object_limit: INTEGER_32
			-- Maximum size of object in generational scavenge zone.
			-- If the environment variable EIF_GS_LIMIT
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)

	is_destroyed: BOOLEAN
			-- Is `Current' no longer usable?
			-- (from EV_ANY_I)

	is_developer_exception: BOOLEAN
			-- Is the last exception originally due to
			-- a developer exception?
			-- (from EXCEPTIONS)

	is_developer_exception_of_name (name: STRING_8): BOOLEAN
			-- Is the last exception originally due to a developer
			-- exception of name `name'?
			-- (from EXCEPTIONS)

	is_signal: BOOLEAN
			-- Is last exception originally due to an external
			-- event (operating system signal)?
			-- (from EXCEPTIONS)

	is_system_exception: BOOLEAN
			-- Is last exception originally due to an
			-- external event (operating system error)?
			-- (from EXCEPTIONS)

	largest_coalesced_block: INTEGER_32
			-- Size of largest coalesced block since last call to
			-- `largest_coalesced'; 0 if none.
			-- (from MEMORY)

	max_mem: INTEGER_32
			-- Maximum amount of bytes the run-time can allocate.
			-- (from MEMORY)

	meaning (except: INTEGER_32): ?STRING_8
			-- A message in English describing what `except' is
			-- (from EXCEPTIONS)

	memory_count_map: HASH_TABLE [INTEGER_32, INTEGER_32]
			-- Number of instances per dynamic type present in system.
			-- Same as memory_map except that no references on the objects themselves
			-- is kept.
			-- (from MEMORY)

	memory_map: HASH_TABLE [ARRAYED_LIST [ANY], INTEGER_32]
			-- Retrieves all object in system as a table indexed by dynamic type
			-- where elements are all instances of a given data type.
			-- (from MEMORY)

	memory_threshold: INTEGER_32
			-- Minimum amount of bytes to be allocated before
			-- starting an automatic garbage collection.
			-- (from MEMORY)

	objects_instance_of (an_object: ANY): SPECIAL [ANY]
			-- Objects that have same dynamic type as `an_object'.
			-- (from MEMORY)

	original_class_name: ?STRING_8
			-- Name of the class that includes the recipient
			-- of original form of last exception
			-- (from EXCEPTIONS)

	original_exception: INTEGER_32
			-- Original code of last exception that triggered
			-- current exception
			-- (from EXCEPTIONS)

	original_recipient_name: ?STRING_8
			-- Name of the routine whose execution was
			-- interrupted by original form of last exception
			-- (from EXCEPTIONS)

	original_tag_name: ?STRING_8
			-- Assertion tag for original form of last
			-- assertion violation.
			-- (from EXCEPTIONS)

	recipient_name: ?STRING_8
			-- Name of the routine whose execution was
			-- interrupted by last exception
			-- (from EXCEPTIONS)

	referers (an_object: ANY): SPECIAL [ANY]
			-- Objects that refer to `an_object'.
			-- (from MEMORY)

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of `other'?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))

	scavenge_zone_size: INTEGER_32
			-- Size of generational scavenge zone.
			-- If the environment variable EIF_MEMORY_SCAVENGE
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)

	tag_name: ?STRING_8
			-- Tag of last violated assertion clause
			-- (from EXCEPTIONS)

	tenure: INTEGER_32
			-- Maximum age of object before being considered
			-- as old (old objects are not scanned during
			-- partial collection).
			-- If the environment variable EIF_TENURE_MAX
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)

	tooltip_delay: INTEGER_32
			-- Time in milliseconds before tooltips pop up.
	
feature -- Status setting

	allocate_compact
			-- Enter ``memory'' mode: will try to compact memory
			-- before requesting more from the operating system.
			-- (from MEMORY)

	allocate_fast
			-- Enter ``speed'' mode: will optimize speed of memory
			-- allocation rather than memory usage.
			-- (from MEMORY)

	allocate_tiny
			-- Enter ``tiny'' mode: will enter ``memory'' mode
			-- after having freed as much memory as possible.
			-- (from MEMORY)

	catch (code: INTEGER_32)
			-- Make sure that any exception of code `code' will be
			-- caught. This is the default.
			-- (from EXCEPTIONS)

	collection_off
			-- Disable garbage collection.
			-- (from MEMORY)

	collection_on
			-- Enable garbage collection.
			-- (from MEMORY)

	die (code: INTEGER_32)
			-- Terminate execution with exit status `code',
			-- without triggering an exception.
			-- (from EXCEPTIONS)

	disable_time_accounting
			-- Disable GC time accounting (default).
			-- (from MEMORY)

	enable_time_accounting
			-- Enable GC time accouting, accessible in gc_statistics.
			-- (from MEMORY)

	execute_without_collection (a_action: PROCEDURE [ANY, TUPLE])
			-- Execute `a_action' with the garbage collector disabled.
			-- If `a_action' modifies the status of collecting, we restore
			-- it no matter what at the end.
			-- (from MEMORY)
		require -- from MEMORY
			a_action_not_void: a_action /= Void
		ensure -- from MEMORY
			collection_status_preserved: collecting = old collecting

	ignore (code: INTEGER_32)
			-- Make sure that any exception of code `code' will be
			-- ignored. This is not the default.
			-- (from EXCEPTIONS)

	message_on_failure
			-- Print an exception history table
			-- in case of failure.
			-- This is the default.
			-- (from EXCEPTIONS)

	no_message_on_failure
			-- Do not print an exception history table
			-- in case of failure.
			-- (from EXCEPTIONS)

	raise (name: STRING_8)
			-- Raise a developer exception of name `name'.
			-- (from EXCEPTIONS)

	raise_retrieval_exception (name: STRING_8)
			-- Raise a retrieval exception of name `name'.
			-- (from EXCEPTIONS)

	set_coalesce_period (value: INTEGER_32)
			-- Set coalesce_period. Every `value' collection,
			-- the Garbage Collector will coalesce
			-- the whole memory.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value >= 0

	set_collection_period (value: INTEGER_32)
			-- Set collection_period. Every `value' collection,
			-- the Garbage collector will perform a collection
			-- on the whole memory (full collection), otherwise
			-- a simple partial collection is done.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value >= 0

	set_max_mem (value: INTEGER_32)
			-- Set the maximum amount of memory the run-time can allocate.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value > 0

	set_memory_threshold (value: INTEGER_32)
			-- Set a new memory_threshold in bytes. Whenever the memory
			-- allocated for Eiffel reaches this value, an automatic
			-- collection is performed.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value > 0

	set_tooltip_delay (a_delay: INTEGER_32)
			-- Set tooltip_delay to `a_delay'.
		require
			a_delay_non_negative: a_delay >= 0
		ensure
			assigned: tooltip_delay = a_delay
	
feature -- Removal

	collect
			-- Force a partial collection cycle if garbage
			-- collection is enabled; do nothing otherwise.
			-- (from MEMORY)

	dispose
			-- Action to be executed just before garbage collection
			-- reclaims an object.
			-- Default version does nothing; redefine in descendants
			-- to perform specific dispose actions. Those actions
			-- should only take care of freeing external resources;
			-- they should not perform remote calls on other objects
			-- since these may also be dead and reclaimed.
			-- (from MEMORY)

	free (object: ANY)
			-- Free `object', by-passing garbage collection.
			-- Erratic behavior will result if the object is still
			-- referenced.
			-- (from MEMORY)

	full_coalesce
			-- Coalesce the whole memory: merge adjacent free
			-- blocks to reduce fragmentation. Useful, when
			-- a lot of memory is allocated with garbage collector off.
			-- (from MEMORY)

	full_collect
			-- Force a full collection cycle if garbage
			-- collection is enabled; do nothing otherwise.
			-- (from MEMORY)

	mem_free (addr: POINTER)
			-- Free memory of object at `addr'.
			-- (Preferred interface is free.)
			-- (from MEMORY)
	
feature -- Duplication

	copy (other: EV_APPLICATION_I)
			-- Update current object using fields of object attached
			-- to `other', so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		ensure -- from ANY
			is_equal: is_equal (other)

	frozen deep_copy (other: EV_APPLICATION_I)
			-- Effect equivalent to that of:
			--		copy (`other' . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)

	frozen deep_twin: EV_APPLICATION_I
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)

	frozen standard_copy (other: EV_APPLICATION_I)
			-- Copy every field of `other' onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)

	frozen standard_twin: EV_APPLICATION_I
			-- New object field-by-field identical to `other'.
			-- Always uses default copying semantics.
			-- (from ANY)
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)

	frozen twin: EV_APPLICATION_I
			-- New object equal to `Current'
			-- twin calls copy; to change copying/twining semantics, redefine copy.
			-- (from ANY)
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result.is_equal (Current)
	
feature -- Basic operations

	frozen default: ?EV_APPLICATION_I
			-- Default value of object's type
			-- (from ANY)

	frozen default_pointer: POINTER
			-- Default value of type `POINTER'
			-- (Avoid the need to write `p'.default for
			-- some `p' of type `POINTER'.)
			-- (from ANY)

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
	
feature -- Implementation

	call_post_launch_actions
			-- Call the post launch actions.

	exception_dialog: EV_DIALOG
			-- Dialog used for showing uncaught exceptions.

	interface: EV_APPLICATION
			-- Provides a common user interface to platform dependent
			-- functionality implemented by `Current'

	new_exception: EXCEPTION
			-- New exception object representating the last exception caught in Current
		ensure
			new_exception_not_void: Result /= Void

	on_exception_action (an_exception: EXCEPTION)
			-- Call exception actions.
		require
			an_exception_not_void: an_exception /= Void

	show_exception_dialog: BOOLEAN is True
			-- Should the exception dialog be shown by default?

	uncaught_exception_actions_called: BOOLEAN
			-- Are the `uncaught_exceptions_actions' currently being called?
			-- This is used to prevent infinite looping should an exception be raised as part of calling uncaught_exception_actions.
	
feature 

	pointer_motion_actions: EV_LITE_ACTION_SEQUENCE [TUPLE [EV_WIDGET, INTEGER_32, INTEGER_32]]
			-- Actions to be performed when screen pointer moves.
			-- (from EV_APPLICATION_ACTION_SEQUENCES_I)
		ensure -- from EV_APPLICATION_ACTION_SEQUENCES_I
			not_void: Result /= Void
	
feature -- Basic operation

	add_idle_action (a_idle_action: PROCEDURE [ANY, TUPLE])
			-- Extend idle_actions with `a_idle_action'.
			-- Thread safe
		require
			a_idle_action_not_void: a_idle_action /= Void

	display_help_for_widget (a_widget: EV_WIDGET)
			-- Display contextual help for `a_widget', if any.
		require
			a_widget_not_void: a_widget /= Void

	enable_contextual_help
			-- Change mouse cursor to help cursor
			-- Capture mouse input
			-- Send help context of widget under mouse cursor when left mouse button is pressed to help engine.
			-- Cancel contextual help mode when right mouse button is pressed.

	lock
			-- Lock the Mutex.

	process_events
			-- Process any pending events.

	process_events_until_stopped
			-- Process all events until 'stop_processing' is called.

	process_graphical_events
			-- Process any pending paint events.
			-- Pass control to the GUI toolkit so that it can
			-- handle any paint events that may be in its queue.

	remove_idle_action (a_idle_action: PROCEDURE [ANY, TUPLE])
			-- Remove `a_idle_action' from idle_actions
			-- Thread safe
		require
			a_idle_action_not_void: a_idle_action /= Void

	sleep (msec: INTEGER_32)
			-- Wait for `msec' milliseconds and return.
		require
			msec_non_negative: msec >= 0

	stop_processing
			--  Exit process_events_until_stopped.

	try_lock: BOOLEAN
			-- Try to see if we can lock, False means no lock could be attained