    indexing
    	description: "Eiffel Vision window. Implementation interface."
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-07-27 17:53:33 -0700 (Thu, 27 Jul 2006) $"
    	revision: "$Revision: 61709 $"

    deferred class interface
    	EV_WINDOW_I

    feature -- Access

    	accelerator_list: EV_ACCELERATOR_LIST
    			-- Key combination shortcuts associated with this window.

    	accept_cursor: EV_POINTER_STYLE
    			-- Accept cursor set by user.
    			-- To be displayed when the screen pointer is over a target that accepts
    			-- pebble during pick and drop.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	actual_drop_target_agent: FUNCTION [ANY, TUPLE [INTEGER_32, INTEGER_32], EV_ABSTRACT_PICK_AND_DROPABLE]
    			-- Overrides default drop target on a certain position.
    			-- If `Void', will use the default drop target.
    			-- Always void if `Current' is not a widget.
    			-- (from EV_WIDGET_I)

    	background_color: EV_COLOR
    			-- Color displayed behind foregournd features.
    			-- (from EV_COLORIZABLE_I)

    	client_height: INTEGER_32
    			-- Height of the client area of container.
    			-- (from EV_CONTAINER_I)
    		ensure -- from EV_CONTAINER_I
    			positive: Result >= 0

    	client_width: INTEGER_32
    			-- Width of the client area of container.
    			-- (from EV_CONTAINER_I)
    		ensure -- from EV_CONTAINER_I
    			positive: Result >= 0

    	default_key_processing_handler: PREDICATE [ANY, TUPLE [EV_KEY]]
    			-- Agent used to determine whether the default key processing should occur for `Current'.
    			-- If agent returns `True' then default key processing continues as normal, False prevents
    			-- default key processing from occuring.
    			-- (from EV_WIDGET_I)

    	deny_cursor: EV_POINTER_STYLE
    			-- Deny cursor set by user.
    			-- To be displayed when the screen pointer is not over a valid target.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	foreground_color: EV_COLOR
    			-- Color of foreground features like text.
    			-- (from EV_COLORIZABLE_I)

    	generating_type: STRING_8
    			-- Name of current object's generating type
    			-- (type of which it is a direct instance)
    			-- (from ANY)

    	generator: STRING_8
    			-- Name of current object's generating class
    			-- (base class of the type of which it is a direct instance)
    			-- (from ANY)

    	has (v: like item): BOOLEAN
    			-- Does structure include `v'?

    	help_context: FUNCTION [ANY, TUPLE, EV_HELP_CONTEXT]
    			-- Agent that evaluates to help context sent to help engine when help is requested
    			-- (from EV_HELP_CONTEXTABLE_I)
    		ensure -- from EV_HELP_CONTEXTABLE_I
    			current_if_exists: internal_help_context /= Void implies Result = internal_help_context

    	internal_maximum_height: INTEGER_32
    			-- Maximum height that `Current' can take.

    	internal_maximum_width: INTEGER_32
    			-- Maximum width that `Current' can take.

    	internal_pointer_style: EV_POINTER_STYLE
    			-- Cursor displayed when screen pointer is over current widget,
    			-- as seen from interface.
    			-- (from EV_WIDGET_I)

    	is_border_enabled: BOOLEAN
    			-- Is a border displayed around `Current'?
    			-- Always return `True' if user_can_resize.

    	is_dock_executing: BOOLEAN
    			-- Is `Current' in the process of a dockable transport?
    			-- (from EV_DOCKABLE_SOURCE_I)

    	is_dockable: BOOLEAN
    			-- Is `Current' dockable?
    			-- (from EV_DOCKABLE_SOURCE_I)

    	is_external_docking_enabled: BOOLEAN
    			-- Is `Current' able to be docked into an EV_DOCKABLE_DIALOG
    			-- When there is no valid EV_DRAGABLE_TARGET upon completion
    			-- of the transport?
    			-- (from EV_DOCKABLE_SOURCE_I)

    	is_external_docking_relative: BOOLEAN
    			-- Will dockable dialog displayed when `Current' is docked externally
    			-- be displayed relative to parent window of `Current'?
    			-- Otherwise displayed as a standard window.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	item: EV_WIDGET
    			-- Current item.
    			-- (from EV_CONTAINER_I)

    	lower_bar: EV_VERTICAL_BOX
    			-- Room at bottom of `Current'. (Example use: statusbar.)

    	maximum_height: INTEGER_32
    			-- Maximum height that `Current' can take.

    	maximum_width: INTEGER_32
    			-- Maximum width that `Current' can take.

    	menu_bar: EV_MENU_BAR
    			-- Horizontal bar at top of client area that contains menu's.

    	merged_radio_button_groups: ARRAYED_LIST [EV_CONTAINER]
    			-- `Result' is all other radio button groups
    			-- merged with `Current'.
    			-- (from EV_CONTAINER_I)
    		ensure -- from EV_CONTAINER_I
    			current_not_included: Result /= Void implies not Result.has (interface)

    	not_external_docking_enabled: BOOLEAN
    			-- Attribute used for `is_externally_dockable'. We must implement
    			-- `is_externally_dockable' this way as we have no easy solution to
    			-- assign `True' to `is_externally_dockable'.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	not_is_external_docking_relative: BOOLEAN
    			-- Will dockable dialog displayed when `Current' is docked externally
    			-- be displayed relative to parent window of `Current'?
    			-- Otherwise displayed as a standard window.
    			-- Internal reversed value of is_external_docking_relative as we cannot
    			-- easily initialize a BOOLE to True in this case.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	original_parent_position: INTEGER_32
    			-- Original position in parent. Required
    			-- to restore widget later.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	parent: EV_CONTAINER
    			-- Container widget that contains `Current'.
    			-- (Void if `Current' is not in a container)
    			-- (from EV_WIDGET_I)

    	pebble: ANY
    			-- Data to be transported by pick and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	pebble_function: FUNCTION [ANY, TUPLE, ANY]
    			-- Returns data to be transported by pick and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	pebble_positioning_enabled: BOOLEAN
    			-- If `True' then pick and drop start coordinates are
    			-- pebble_x_position, pebble_y_position.
    			-- If `False' then pick and drop start coordinates are
    			-- the pointer coordinates.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	pebble_x_position: INTEGER_32
    			-- Initial x position for pick and drop relative to `Current'.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	pebble_y_position: INTEGER_32
    			-- Initial y position for pick and drop relative to `Current'.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	background_pixmap: EV_PIXMAP
    			-- Image displayed on `Current'.
    			-- (from EV_PIXMAPABLE_I)

    	pointer_position: EV_COORDINATE
    			-- Position of the screen pointer relative to `Current'.
    			-- (from EV_WIDGET_I)
    		ensure -- from EV_WIDGET_I
    			result_not_void: Result /= Void

    	pointer_style: EV_POINTER_STYLE
    			-- Cursor displayed when screen pointer is over current widget.
    			-- Void if none has been set using `set_pointer_position'.
    			-- (from EV_WIDGET_I)

    	real_source: EV_DOCKABLE_SOURCE
    			-- `Result' is EV_DOCKABLE_SOURCE which should be
    			-- dragged when docking begins on `Current'.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	real_target: EV_DOCKABLE_TARGET
    			-- `Result' is target used during a dockable transport if
    			-- mouse pointer is above `Current'.
    			-- (from EV_WIDGET_I)

    	title: STRING_32
    			-- Application name to be displayed by the window manager.

    	upper_bar: EV_VERTICAL_BOX
    			-- Room at top of `Current'. (Example use: toolbars.)
    			-- Positioned below menu bar.

    	user_can_resize: BOOLEAN
    			-- Can the user resize?

    feature -- Measurement

    	height: INTEGER_32
    			-- Vertical size in pixels.
    			-- (from EV_POSITIONED_I)

    	minimum_height: INTEGER_32
    			-- Minimum vertical size in pixels.
    			-- (from EV_POSITIONED_I)

    	minimum_width: INTEGER_32
    			-- Minimum horizontal size in pixels.
    			-- (from EV_POSITIONED_I)

    	screen_x: INTEGER_32
    			-- Horizontal offset relative to screen.
    			-- (from EV_POSITIONED_I)

    	screen_y: INTEGER_32
    			-- Vertical offset relative to screen.
    			-- (from EV_POSITIONED_I)

    	width: INTEGER_32
    			-- Horizontal size in pixels.
    			-- (from EV_POSITIONED_I)

    	x_position: INTEGER_32
    			-- Horizontal offset relative to parent x_position in pixels.
    			-- (from EV_POSITIONED_I)

    	y_position: INTEGER_32
    			-- Vertical offset relative to parent y_position in pixels.
    			-- (from EV_POSITIONED_I)

    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 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))

    	is_equal (other: like Current): 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: like Current): 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

    	closest_dockable_target: EV_DOCKABLE_TARGET
    			-- `Result' is first dockable target that is_dockable found by recursively
    			-- searching up through the parenting structure from the widget
    			-- currently underneath the pointer position.
    			-- `Result' will be `Void' if a dockable target is not found.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			result_is_dockable: Result /= Void implies Result.is_docking_enabled

    	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

    	get_next_target (a_widget: EV_WIDGET): EV_DOCKABLE_TARGET
    			-- `Result' is next dockable target that is is_dockable found by
    			-- recursively seraching up the parenting structure from `current_target'.
    			-- `Result' will be `Void' if none.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			a_widget_not_void: a_widget /= Void
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			result_is_dockable: Result /= Void implies Result.is_docking_enabled

    	internal_non_sensitive: BOOLEAN
    			-- Is `Current' not sensitive to input as seen
    			-- from interface?
    			-- (from EV_SENSITIVE_I)

    	is_docking_enabled: BOOLEAN
    			-- May `Current' be docked to?
    			-- (from EV_DOCKABLE_TARGET_I)

    	is_transport_enabled: BOOLEAN
    			-- Is the transport mechanism enabled?
    			-- (from EV_PICK_AND_DROPABLE_I)

    	mode_is_drag_and_drop: BOOLEAN
    			-- Is the transport mechanism drag and drop?
    			-- (from EV_PICK_AND_DROPABLE_I)

    	mode_is_pick_and_drop: BOOLEAN
    			-- Is the transport mechanism pick and drop?
    			-- (from EV_PICK_AND_DROPABLE_I)

    	mode_is_target_menu: BOOLEAN
    			-- Is the transport mechanism target menu?
    			-- (from EV_PICK_AND_DROPABLE_I)

    	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))

    	user_is_sensitive: BOOLEAN
    			-- Is the object sensitive to user input.
    			-- (from EV_SENSITIVE_I)

    	veto_dock_function: FUNCTION [ANY, TUPLE [EV_DOCKABLE_SOURCE], BOOLEAN]
    			-- Function used to veto transport.
    			-- (from EV_DOCKABLE_TARGET_I)

    feature -- Status setting

    	allow_resize
    			-- Allow the resize of the window.

    	disable_border
    			-- Ensure no border is displayed around `Current'
    			-- and set internal_is_border_enabled to `False'.
    		ensure
    			border_disabled: not user_can_resize implies not is_border_enabled

    	disable_dockable
    			-- Ensure `Current' is not dockable
    			-- (from EV_DOCKABLE_SOURCE_I)
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			not_is_dockable: not is_dockable

    	disable_docking
    			-- Ensure is_docking_enabled is False.
    			-- `Current' will not accept docking.
    			-- (from EV_DOCKABLE_TARGET_I)
    		ensure -- from EV_DOCKABLE_TARGET_I
    			not_dockable: not is_docking_enabled
    			id_not_stored_in_application: not (create {EV_ENVIRONMENT}).application.implementation.dockable_targets.has (interface.object_id)

    	disable_external_docking
    			-- Forbid `Current' to be docked into an EV_DOCKABLE_DIALOG
    			-- When there is no valid EV_DRAGABLE_TARGET upon completion
    			-- of the transport?
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			is_dockable: is_dockable
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			not_externally_dockable: not is_external_docking_enabled

    	disable_external_docking_relative
    			-- Assign `False' to is_external_docking_relative, ensuring that
    			-- a dockable dialog displayed when `Current' is docked externally
    			-- is displayed as a standard window.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			external_docking_enabled: is_external_docking_enabled
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			external_docking_not_relative: not is_external_docking_relative

    	disable_pebble_positioning
    			-- Assign `False' to pebble_positioning_enabled.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	disable_transport
    			-- Deactivate pick/drag and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			is_transport_disabled: not is_transport_enabled

    	disable_user_resize
    			-- Forbid the resize of the window.

    	enable_border
    			-- Ensure a border is displayed around `Current'
    			-- and set internal_is_border_enabled to `True'.
    		ensure
    			is_border_enabled: is_border_enabled

    	enable_dockable
    			-- Allow `Current' to be dockable
    			-- (from EV_DOCKABLE_SOURCE_I)
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			is_dockable: is_dockable

    	enable_docking
    			-- Ensure is_docking_enabled is True.
    			-- `Current' will accept docking from a
    			-- compatible EV_DOCKABLE_SOURCE.
    			-- (from EV_DOCKABLE_TARGET_I)
    		ensure -- from EV_DOCKABLE_TARGET_I
    			is_dockable: is_docking_enabled
    			id_stored_in_application: (create {EV_ENVIRONMENT}).application.implementation.dockable_targets.has (interface.object_id)

    	enable_external_docking
    			-- Allow `Current' to be docked into an EV_DOCKABLE_DIALOG
    			-- When there is no valid EV_DRAGABLE_TARGET upon completion
    			-- of the transport?
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			is_dockable: is_dockable
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			is_externally_dockable: is_external_docking_enabled

    	enable_external_docking_relative
    			-- Assign `True' to is_external_docking_relative, ensuring that
    			-- a dockable dialog displayed when `Current' is docked externally
    			-- is displayed relative to the top level window.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			external_docking_enabled: is_external_docking_enabled
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			external_docking_not_relative: is_external_docking_relative

    	enable_pebble_positioning
    			-- Assign `True' to pebble_positioning_enabled.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	enable_transport
    			-- Activate pick/drag and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		require -- from EV_PICK_AND_DROPABLE_I
    			pebble_not_void: pebble /= Void or pebble_function /= Void
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			is_transport_enabled: interface.implementation.is_transport_enabled

    	enable_user_resize
    			-- Allow the resize of the window.

    	forbid_resize
    			-- Forbid the resize of the window.

    	hide
    			-- Request that `Current' not be displayed when its parent is.
    			-- (from EV_WIDGET_I)

    	internal_disable_dockable
    			-- Platform specific implementation of disable_dockable.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	internal_enable_dockable
    			-- Platform specific implementation of enable_dockable.
    			-- (from EV_DOCKABLE_SOURCE_I)

    	lock_update
    			-- Lock updates for this window on certain platforms until
    			-- unlock_update is called.

    	merge_radio_button_groups (other: EV_CONTAINER)
    			-- Merge `Current' radio button group with that of `other'.
    			-- (from EV_CONTAINER_I)

    	remove_default_key_processing_handler
    			-- Ensure default_key_processing_handler is Void.
    			-- (from EV_WIDGET_I)
    		ensure -- from EV_WIDGET_I
    			default_key_processing_handler_removed: default_key_processing_handler = Void

    	remove_menu_bar
    			-- Set menu_bar to `Void'.
    		ensure
    			menu_bar_void: menu_bar = Void

    	remove_pebble
    			-- Remove pebble.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			pebble_removed: pebble = Void and pebble_function = Void
    			is_transport_disabled: not is_transport_enabled

    	remove_real_source
    			-- Ensure real_source is `Void'.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			is_dockable: is_dockable
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			real_source_void: real_source = Void

    	remove_real_target
    			-- Ensure real_target is `Void'.
    			-- (from EV_WIDGET_I)
    		ensure -- from EV_WIDGET_I
    			real_target_void: real_target = Void

    	set_accept_cursor (a_cursor: like accept_cursor)
    			-- Set `a_cursor' to be displayed when the screen pointer is over a
    			-- target that accepts pebble during pick and drop.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	set_actual_drop_target_agent (an_agent: like actual_drop_target_agent)
    			-- Assign `an_agent' to actual_drop_target_agent.
    			-- (from EV_WIDGET_I)
    		require -- from EV_WIDGET_I
    			an_agent_not_void: an_agent /= Void
    		ensure -- from EV_WIDGET_I
    			assigned: actual_drop_target_agent = an_agent

    	set_default_colors
    			-- Set foreground and background color to their default values.
    			-- (from EV_COLORIZABLE_I)

    	set_default_key_processing_handler (a_handler: like default_key_processing_handler)
    			-- Assign default_key_processing_handler to `a_handler'.
    			-- (from EV_WIDGET_I)

    	set_deny_cursor (a_cursor: like deny_cursor)
    			-- Set `a_cursor' to be displayed when the screen pointer is over a
    			-- target that doesn't accept pebble during pick and drop.
    			-- (from EV_PICK_AND_DROPABLE_I)

    	set_drag_and_drop_mode
    			-- Set transport mechanism to drag and drop,
    			-- (from EV_PICK_AND_DROPABLE_I)
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			mode_is_drag_and_drop: mode_is_drag_and_drop

    	set_focus
    			-- Grab keyboard focus.
    			-- (from EV_WIDGET_I)

    	set_height (a_height: INTEGER_32)
    			-- Set the vertical size to `a_height'.
    			-- (from EV_POSITIONABLE_I)
    		require -- from EV_POSITIONABLE_I
    			a_height_positive_or_zero: a_height >= 0
    		ensure -- from EV_POSITIONABLE_I
    			height_assigned: height = minimum_height or else height = a_height

    	set_maximum_height (value: INTEGER_32)
    			-- Make `value' the new maximum_height.
    		require
    			large_enough: value >= 0
    		ensure
    			maximum_height_set: maximum_height = value

    	set_maximum_size (mw, mh: INTEGER_32)
    			-- Make `mw' the new minimum_width and `mh' the new
    			-- minimum_height.
    		require
    			valid_width: mw >= minimum_width
    			valid_height: mh >= minimum_height

    	set_maximum_width (value: INTEGER_32)
    			-- Make `value' the new maximum_width.
    		require
    			large_enough: value >= 0
    		ensure
    			maximum_width_set: maximum_width = value

    	set_menu_bar (a_menu_bar: EV_MENU_BAR)
    			-- Set menu_bar to `a_menu_bar'.
    		require
    			no_menu_bar_assigned: menu_bar = Void
    			a_menu_bar_not_void: a_menu_bar /= Void
    		ensure
    			assigned: menu_bar = a_menu_bar

    	set_pebble (a_pebble: like pebble)
    			-- Assign `a_pebble' to pebble.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		require -- from EV_PICK_AND_DROPABLE_I
    			a_pebble_not_void: a_pebble /= Void
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			pebble_assigned: interface.implementation.pebble = a_pebble
    			is_transport_enabled: interface.implementation.is_transport_enabled

    	set_pebble_function (a_function: FUNCTION [ANY, TUPLE, ANY])
    			-- Assign `a_function' to pebble_function.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		require -- from EV_PICK_AND_DROPABLE_I
    			a_function_not_void: a_function /= Void
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			pebble_function_assigned: interface.implementation.pebble_function = a_function
    			is_transport_enabled: interface.implementation.is_transport_enabled

    	set_pebble_position (a_x, a_y: INTEGER_32)
    			-- Set the initial position for pick and drop relative to `Current'.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			pick_x_assigned: pick_x = a_x
    			pick_y_assigned: pick_y = a_y

    	set_pick_and_drop_mode
    			-- Set transport mechanism to pick and drop,
    			-- (from EV_PICK_AND_DROPABLE_I)
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			mode_is_pick_and_drop: mode_is_pick_and_drop

    	set_position (a_x, a_y: INTEGER_32)
    			-- Set horizontal offset to parent to `a_x'.
    			-- Set vertical offset to parent to `a_y'.
    			-- (from EV_POSITIONABLE_I)
    		ensure -- from EV_POSITIONABLE_I
    			x_position_assigned: x_position = a_x
    			y_position_assigned: y_position = a_y

    	set_real_source (dockable_source: EV_DOCKABLE_SOURCE)
    			-- Set `dockable_source' to be the widget moved when a
    			-- drag begins on `Current'.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			is_dockable: is_dockable
    			dockable_source_not_void: dockable_source /= Void
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			real_source_assigned: real_source = dockable_source

    	set_real_target (a_target: EV_DOCKABLE_TARGET)
    			-- Assign `a_target' to real_target.
    			-- (from EV_WIDGET_I)
    		require -- from EV_WIDGET_I
    			target_not_void: a_target /= Void
    		ensure -- from EV_WIDGET_I
    			assigned: real_target = a_target

    	set_size (a_width, a_height: INTEGER_32)
    			-- Set the horizontal size to `a_width'.
    			-- Set the vertical size to `a_height'.
    			-- (from EV_POSITIONABLE_I)
    		require -- from EV_POSITIONABLE_I
    			a_width_positive_or_zero: a_width >= 0
    			a_height_positive_or_zero: a_height >= 0
    		ensure -- from EV_POSITIONABLE_I
    			width_assigned: width = minimum_width or else width = a_width
    			height_assigned: height = minimum_height or else height = a_height

    	set_target_menu_mode
    			-- Set transport mechanism to target_menu.
    			-- (from EV_PICK_AND_DROPABLE_I)
    		ensure -- from EV_PICK_AND_DROPABLE_I
    			mode_is_target_menu: mode_is_target_menu

    	set_title (txt: STRING_GENERAL)
    			-- Make `txt' the new title.
    		require
    			valid_title: txt /= Void

    	set_veto_dock_function (a_function: FUNCTION [ANY, TUPLE [EV_DOCKABLE_SOURCE], BOOLEAN])
    			-- Assign `a_function' to veto_dock_function.
    			-- (from EV_DOCKABLE_TARGET_I)
    		require -- from EV_DOCKABLE_TARGET_I
    			a_function_not_void: a_function /= Void
    		ensure -- from EV_DOCKABLE_TARGET_I
    			veto_function_set: veto_dock_function = a_function

    	set_width (a_width: INTEGER_32)
    			-- Set the horizontal size to `a_width'.
    			-- (from EV_POSITIONABLE_I)
    		require -- from EV_POSITIONABLE_I
    			a_width_positive_or_zero: a_width >= 0
    		ensure -- from EV_POSITIONABLE_I
    			width_assigned: width = minimum_width or else width = a_width

    	set_x_position (a_x: INTEGER_32)
    			-- Set horizontal offset to parent to `a_x'.
    			-- (from EV_POSITIONABLE_I)
    		ensure -- from EV_POSITIONABLE_I
    			x_position_assigned: x_position = a_x

    	set_y_position (a_y: INTEGER_32)
    			-- Set vertical offset to parent to `a_y'.
    			-- (from EV_POSITIONABLE_I)
    		ensure -- from EV_POSITIONABLE_I
    			y_position_assigned: y_position = a_y

    	show
    			-- Request that `Current' be displayed when its parent is.
    			-- (from EV_WIDGET_I)

    	show_relative_to_window (a_parent: EV_WINDOW)
    			-- Show `Current' with respect to `a_parent'.

    	unlock_update
    			-- Unlock updates for this window on certain platforms.

    	unmerge_radio_button_groups (other: EV_CONTAINER)
    			-- Remove `other' from radio button group of `Current'.
    			-- (from EV_CONTAINER_I)

    	user_disable_sensitive
    			-- Make object desensitive to user input.
    			-- (from EV_SENSITIVE_I)
    		ensure -- from EV_SENSITIVE_I
    			is_desensitive: not user_is_sensitive

    	user_enable_sensitive
    			-- Make object sensitive to user input.
    			-- (from EV_SENSITIVE_I)
    		ensure -- from EV_SENSITIVE_I
    			is_sensitive_if_parent_sensitive: (has_parent and then parent_is_sensitive) implies interface.implementation.is_sensitive
    			is_sensitive_if_orphaned: not has_parent implies interface.implementation.is_sensitive

    feature -- Element change

    	extend (an_item: like item)
    			-- Ensure that structure includes `an_item'.
    			-- (from EV_CELL_I)
    		require -- from EV_CONTAINER_I
    			v_not_void: an_item /= Void

    	pixmap_equal_to (a_pixmap: EV_PIXMAP): BOOLEAN
    			-- Is `a_pixmap' equal to `pixmap'?
    			-- (from EV_PIXMAPABLE_I)

    	remove_help_context
    			-- Remove key press action associated with `EV_APPLICATION.help_key'.
    			-- (from EV_HELP_CONTEXTABLE_I)
    		require -- from EV_HELP_CONTEXTABLE_I
    			help_context_not_void: help_context /= Void
    		ensure -- from EV_HELP_CONTEXTABLE_I
    			no_help_context: internal_help_context = Void

    	remove_background_pixmap
    			-- Make `pixmap' `Void'.
    			-- (from EV_PIXMAPABLE_I)
    		ensure -- from EV_PIXMAPABLE_I
    			pixmap_removed: background_pixmap = Void

    	replace (v: like item)
    			-- Replace item with `v'.
    			-- (from EV_CONTAINER_I)

    	set_background_color (a_color: like background_color)
    			-- Assign `a_color' to foreground_color.
    			-- (from EV_COLORIZABLE_I)
    		require -- from EV_COLORIZABLE_I
    			a_color_not_void: a_color /= Void
    		ensure -- from EV_COLORIZABLE_I
    			background_color_assigned: is_initialized implies interface.implementation.background_color.is_equal (a_color)

    	set_foreground_color (a_color: like foreground_color)
    			-- Assign `a_color' to foreground_color.
    			-- (from EV_COLORIZABLE_I)
    		require -- from EV_COLORIZABLE_I
    			a_color_not_void: a_color /= Void
    		ensure -- from EV_COLORIZABLE_I
    			foreground_color_assigned: is_initialized implies interface.implementation.foreground_color.is_equal (a_color)

    	set_help_context (an_help_context: like help_context)
    			-- Assign `a_help_context' to help_context.
    			-- Assign `an_help_context' to help_context.
    			-- (from EV_HELP_CONTEXTABLE_I)
    		require -- from EV_HELP_CONTEXTABLE_I
    			an_help_context_not_void: an_help_context /= Void
    		ensure -- from EV_HELP_CONTEXTABLE_I
    			help_context_assigned: help_context.is_equal (an_help_context)

    	set_minimum_height (a_minimum_height: INTEGER_32)
    			-- Set the minimum vertical size to `a_minimum_height' in pixels.
    			-- (from EV_WIDGET_I)
    		require -- from EV_WIDGET_I
    			a_minimum_height_positive: a_minimum_height >= 0
    		ensure -- from EV_WIDGET_I
    			minimum_height_assigned: is_usable implies interface.minimum_height = a_minimum_height

    	set_minimum_size (a_minimum_width, a_minimum_height: INTEGER_32)
    			-- Set the minimum horizontal size to `a_minimum_width' in pixels.
    			-- Set the minimum vertical size to `a_minimum_height' in pixels.
    			-- (from EV_WIDGET_I)
    		require -- from EV_WIDGET_I
    			a_minimum_width_positive: a_minimum_width >= 0
    			a_minimum_height_positive: a_minimum_height >= 0
    		ensure -- from EV_WIDGET_I
    			minimum_width_assigned: is_usable implies interface.minimum_width = a_minimum_width
    			minimum_height_assigned: is_usable implies interface.minimum_height = a_minimum_height

    	set_minimum_width (a_minimum_width: INTEGER_32)
    			-- Set the minimum horizontal size to `a_minimum_width' in pixels.
    			-- (from EV_WIDGET_I)
    		require -- from EV_WIDGET_I
    			a_minimum_width_positive: a_minimum_width >= 0
    		ensure -- from EV_WIDGET_I
    			minimum_width_assigned: is_usable implies interface.minimum_width = a_minimum_width

    	set_background_pixmap (a_pixmap: EV_PIXMAP)
    			-- Assign `a_pixmap' to `pixmap'.
    			-- (from EV_PIXMAPABLE_I)
    		require -- from EV_PIXMAPABLE_I
    			pixmap_not_void: a_pixmap /= Void

    feature -- Duplication

    	copy (other: like Current)
    			-- 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: like Current)
    			-- 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: like Current
    			-- New object structure recursively duplicated from Current.
    			-- (from ANY)
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, Result)

    	frozen standard_copy (other: like Current)
    			-- 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: like Current
    			-- 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: like Current
    			-- 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

    	close_dockable_dialog (dockable_dialog: EV_DOCKABLE_DIALOG)
    			-- Close request received by `dockable_dialog' so
    			-- restore widget contained back to its original position
    			-- in its old parent if possible.
    			-- We must fire `dock_ended' actions.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			dockable_dialog_destroyed: dockable_dialog.is_destroyed

    	complete_dock
    			-- Complete a dock from source_being_docked.
    			-- (from EV_DOCKABLE_SOURCE_I)
    		require -- from EV_DOCKABLE_SOURCE_I
    			source_being_docked: source_being_docked /= Void
    		ensure -- from EV_DOCKABLE_SOURCE_I
    			not_dock_executing: not is_dock_executing
    			insert_separator_not_parented: insert_sep.parent = Void
    			insert_label_not_parented: insert_label.parent = Void

    	frozen default: like Current
    			-- 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)

    	propagate_background_color
    			-- Propagate the current background color of the
    			-- container to the children.
    			-- (from EV_CONTAINER_I)
    		ensure -- from EV_CONTAINER_I
    			background_color_propagated: interface.background_color_propagated

    	propagate_foreground_color
    			-- Propagate the current foreground color of the
    			-- container to the children.
    			-- (from EV_CONTAINER_I)
    		ensure -- from EV_CONTAINER_I
    			foreground_color_propagated: interface.foreground_color_propagated

    	refresh_now
    			-- Force an immediate redraw of `Current'.
    			-- (from EV_WIDGET_I)

    feature -- Inapplicable

    	drag_cursor: EV_POINTER_STYLE
    			-- Cursor used when `Current' is being transported.
    			-- (from EV_DOCKABLE_SOURCE_I)

    feature -- Access EV_DRAGABLE_SOURCE.

    	dockable_dialog_target: EV_DOCKABLE_DIALOG
    			-- A dockable dialog that will be created as
    			-- necessary. This is not a local, to avoid it
    			-- being garbage collected.
    			-- (from EV_SHARED_TRANSPORT_I)

    	global_drag_targets: ARRAYED_LIST [INTEGER_32]
    			-- Shortcut to EV_APPLICATION.pnd_targets.
    			-- (from EV_SHARED_TRANSPORT_I)

    	insert_label: EV_CELL
    			-- Label used to indicate where `Current' will be placed in target.
    			-- (from EV_SHARED_TRANSPORT_I)
    		ensure -- from EV_SHARED_TRANSPORT_I
    			result_not_void: Result /= Void

    	insert_label_imp: EV_CELL_I
    			-- Once access to implementation of Insert_label.
    			-- (from EV_SHARED_TRANSPORT_I)
    		ensure -- from EV_SHARED_TRANSPORT_I
    			Result /= Void

    	insert_sep: EV_TOOL_BAR_SEPARATOR
    			-- Once access to a separator used to indicate the insertion position
    			-- when moving tool bar items.
    			-- (from EV_SHARED_TRANSPORT_I)

    	insert_sep_imp: EV_TOOL_BAR_SEPARATOR_I
    			-- Once access to implementation of Insert_sep.
    			-- (from EV_SHARED_TRANSPORT_I)
    		ensure -- from EV_SHARED_TRANSPORT_I
    			Result /= Void

    	internal_screen: EV_SCREEN
    			-- Once access to an EV_SCREEN.
    			-- (from EV_SHARED_TRANSPORT_I)

    	original_x_offset: INTEGER_16
    			-- Original x_offset and original_y_offset of transport
    			-- realtive to widget. Only used for dragable transports.
    			-- (from EV_SHARED_TRANSPORT_I)

    	original_y_offset: INTEGER_16
    			-- Original x_offset and original_y_offset of transport
    			-- realtive to widget. Only used for dragable transports.
    			-- (from EV_SHARED_TRANSPORT_I)

    	originating_source: EV_DOCKABLE_SOURCE_I
    			-- Dragable source that originated the transport of `source_being_dragged'.
    			-- (from EV_SHARED_TRANSPORT_I)

    	remove_insert_label
    			-- Remove Insert_label from its current parent.
    			-- We must handle a special case for cells. If the parent is a cell,
    			-- then we remove the cell from its parent, and then restore it.
    			-- Otherwise, when the label, removed, the cell keeps it size, and cells
    			-- are normally used with real_target when the cell must
    			-- not be visible.
    			-- (from EV_SHARED_TRANSPORT_I)
    		ensure -- from EV_SHARED_TRANSPORT_I
    			not_parented: insert_label.parent = Void

    	remove_insert_sep
    			-- Ensure `inset_sep' is not parented.
    			-- (from EV_SHARED_TRANSPORT_I)
    		ensure -- from EV_SHARED_TRANSPORT_I
    			not_parented: insert_sep.parent = Void

    	source_being_docked: EV_DOCKABLE_SOURCE_I
    			-- Dragable source currently being transported. May be a
    			-- WIDGET_IMP or an EV_TOOL_BAR_BUTTON_IMP.
    			-- (from EV_SHARED_TRANSPORT_I)

    feature -- Access EV_PICK_AND_DROPABLE.

    	default_accept_cursor: EV_POINTER_STYLE
    			-- Used in lieu of a user defined accept_cursor.
    			-- (from EV_SHARED_TRANSPORT_I)

    	default_deny_cursor: EV_POINTER_STYLE
    			-- Used in lieu of a user defined deny_cursor.
    			-- (from EV_SHARED_TRANSPORT_I)

    	default_pixmaps: EV_STOCK_PIXMAPS
    			-- Default pixmaps
    			-- (from EV_SHARED_TRANSPORT_I)

    	global_pnd_targets: HASH_TABLE [INTEGER_32, INTEGER_32]
    			-- Shortcut to EV_APPLICATION.pnd_targets.
    			-- (from EV_SHARED_TRANSPORT_I)

    	rubber_band_is_drawn: BOOLEAN
    			-- Is a rubber band line currently on the screen?
    			-- (from EV_SHARED_TRANSPORT_I)

    feature -- Access common.

    	pointer_x: INTEGER_16
    			-- (from EV_SHARED_TRANSPORT_I)

    	pointer_y: INTEGER_16
    			-- (from EV_SHARED_TRANSPORT_I)

    feature -- Event handling

    	close_request_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when window is requested to be closed.
    			-- (from EV_WINDOW_ACTION_SEQUENCES_I)
    		ensure -- from EV_WINDOW_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	conforming_pick_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when a pebble that fits here is picked.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I)
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	dock_ended_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed after a dock completes from `Current'.
    			-- Either to a dockable target or a dockable dialog.
    			-- (from EV_DOCKABLE_SOURCE_ACTION_SEQUENCES_I)
    		ensure -- from EV_DOCKABLE_SOURCE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	dock_started_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when pebble is picked up.
    			-- (from EV_DOCKABLE_SOURCE_ACTION_SEQUENCES_I)
    		ensure -- from EV_DOCKABLE_SOURCE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	docked_actions: EV_DOCKABLE_SOURCE_ACTION_SEQUENCE
    			-- Actions to be performed
    			-- (from EV_DOCKABLE_TARGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_DOCKABLE_TARGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	drop_actions: EV_PND_ACTION_SEQUENCE
    			-- Actions to be performed when a pebble is dropped here.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I)
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	file_drop_actions: ACTION_SEQUENCE [TUPLE [LIST [STRING_32]]]
    			-- Actions to be performed when an OS file drop occurs on `Current'.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	focus_in_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when keyboard focus is gained.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	focus_out_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when keyboard focus is lost.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	key_press_actions: EV_KEY_ACTION_SEQUENCE
    			-- Actions to be performed when a keyboard key is pressed.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	key_press_string_actions: EV_KEY_STRING_ACTION_SEQUENCE
    			-- Actions to be performed when a keyboard press generates a displayable character.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	key_release_actions: EV_KEY_ACTION_SEQUENCE
    			-- Actions to be performed when a keyboard key is released.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	mouse_wheel_actions: EV_INTEGER_ACTION_SEQUENCE
    			-- Actions to be performed when mouse wheel is rotated.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	move_actions: EV_GEOMETRY_ACTION_SEQUENCE
    			-- Actions to be performed when window moves.
    			-- (from EV_WINDOW_ACTION_SEQUENCES_I)
    		ensure -- from EV_WINDOW_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	new_item_actions: EV_NEW_ITEM_ACTION_SEQUENCE
    			-- Actions to be performed when a new item is added.
    			-- (from EV_CONTAINER_ACTION_SEQUENCES_I)
    		ensure -- from EV_CONTAINER_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pick_actions: EV_PND_START_ACTION_SEQUENCE
    			-- Actions to be performed when pebble is picked up.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I)
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pick_ended_actions: EV_PND_FINISHED_ACTION_SEQUENCE
    			-- Actions to be performed when a transport from `Current' ends.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I)
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pointer_button_press_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE
    			-- Actions to be performed when screen pointer button is pressed.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pointer_button_release_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE
    			-- Actions to be performed when screen pointer button is released.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pointer_double_press_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE
    			-- Actions to be performed when screen pointer is double clicked.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pointer_enter_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when screen pointer enters widget.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pointer_leave_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when screen pointer leaves widget.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	pointer_motion_actions: EV_POINTER_MOTION_ACTION_SEQUENCE
    			-- Actions to be performed when screen pointer moves.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	resize_actions: EV_GEOMETRY_ACTION_SEQUENCE
    			-- Actions to be performed when size changes.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_I)
    		ensure -- from EV_WIDGET_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    	show_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when window is shown.
    			-- (from EV_WINDOW_ACTION_SEQUENCES_I)
    		ensure -- from EV_WINDOW_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    feature -- Output

    	io: STD_FILES
    			-- Handle to standard file setup
    			-- (from ANY)

    	out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of tagged_out.
    			-- (from ANY)

    	print (some: ANY)
    			-- Write terse external representation of `some'
    			-- on standard output.
    			-- (from ANY)

    	frozen tagged_out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of out.
    			-- (from ANY)

    feature -- Platform

    	operating_environment: OPERATING_ENVIRONMENT
    			-- Objects available from the operating system
    			-- (from ANY)

    feature -- Status Report

    	has_capture: BOOLEAN
    			-- Does widget have capture?
    			-- (from EV_WIDGET_I)

    	has_focus: BOOLEAN
    			-- Does widget have the keyboard focus?
    			-- (from EV_WIDGET_I)

    	is_displayed: BOOLEAN
    			-- Is `Current' visible on the screen?
    			-- False if `Current' is entirely obscured by another window.
    			-- (from EV_WIDGET_I)

    	is_show_requested: BOOLEAN
    			-- Will `Current' be displayed when its parent is?
    			-- See also is_displayed.
    			-- (from EV_WIDGET_I)

    invariant
    		-- from EV_WIDGET_I
    	is_displayed_implies_show_requested: is_usable and is_displayed implies is_show_requested

    		-- from EV_PICK_AND_DROPABLE_I
    	user_interface_modes_mutually_exclusive: mode_is_pick_and_drop.to_integer + mode_is_drag_and_drop.to_integer + mode_is_target_menu.to_integer = 1
    	pebble_function_takes_two_integer_open_operands: pebble_function /= Void implies pebble_function.valid_operands ([1, 1])

    		-- from EV_ANY_I
    	interface_coupled: is_usable implies interface /= Void and then interface.implementation = Current
    	base_make_called: base_make_called

    		-- from ANY
    	reflexive_equality: standard_is_equal (Current)
    	reflexive_conformance: conforms_to (Current)

    		-- from EV_DOCKABLE_SOURCE_I
    	widget_or_item_source: not (widget_source_being_docked /= Void and item_source_being_docked /= Void)
    	dock_executing: is_dock_executing implies widget_source_being_docked /= Void or item_source_being_docked /= Void

    		-- from EV_POSITIONED_I
    	minimum_width_positive_or_zero: is_usable implies minimum_width >= 0
    	minimum_height_positive_or_zero: is_usable implies minimum_height >= 0

    indexing
    	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 EV_WINDOW_I