    indexing
    	description: "Eiffel Vision tree. Mswindows implementation."
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-08-24 08:35:38 -0700 (Thu, 24 Aug 2006) $"
    	revision: "$Revision: 62920 $"

    class interface
    	EV_TREE_IMP

    create
    	make (an_interface: like interface)
    			-- Create `Current' with interface `an_interface'.
    		require -- from EV_ANY_I
    			an_interface_not_void: an_interface /= Void
    		ensure -- from EV_ANY_I
    			interface_assigned: interface = an_interface
    			base_make_called: base_make_called

    feature -- Initialization

    	tooltip: STRING_32
    			-- Text of tooltip assigned to `Current'.
    			-- (from EV_TOOLTIPABLE_IMP)
    		require -- from  EV_TOOLTIPABLE_I
    			True

    feature -- Access

    	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)

    	all_ev_children: HASH_TABLE [EV_TREE_NODE_IMP, POINTER]
    			-- Children of `Current' Classified by their h_item

    	awaiting_movement: BOOLEAN
    			-- Are we currently awaiting the movement threshold to
    			-- be reached for as drag and drop or dockable move?
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	capture_enabled: BOOLEAN
    			-- Is the mouse currently captured?
    			-- See constants Capture_xxxx at the end of the class.
    			-- (from EV_PICK_AND_DROPABLE_IMP)

    	commands: WEL_COMMAND_MANAGER
    			-- Command manager associated to the current window.
    			-- (from WEL_WINDOW)

    	cursor: EV_DYNAMIC_LIST_CURSOR [EV_TREE_NODE]
    			-- Current cursor position.
    			-- (from EV_DYNAMIC_LIST_I)
    		ensure -- from EV_DYNAMIC_LIST_I
    			not_void: Result /= Void

    	cursor_on_widget: CELL [EV_WIDGET_IMP]
    			-- This cell contains the widget_imp that currently
    			-- has the pointer of the mouse. As it is a once
    			-- feature, it is a shared data.
    			-- it is used for the `mouse_enter' and `mouse_leave'
    			-- events.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True
    		ensure then -- from EV_WIDGET_IMP
    			result_exists: Result /= Void

    	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)

    	default_parent: EV_INTERNAL_SILLY_WINDOW_IMP
    			-- A default parent for creation of `Current'.
    			-- (from EV_WIDGET_IMP)
    		ensure -- from EV_WIDGET_IMP
    			valid_parent: Result /= Void

    	default_processing: BOOLEAN
    			-- (from WEL_RETURN_VALUE)

    	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)

    	drag_and_drop_starting_movement: INTEGER_32 is 3
    			-- Pointer movement in pixels required to start a drag and drop.
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	ev_children: ARRAYED_LIST [EV_TREE_NODE_IMP]
    			-- List of the direct children of `Current'.

    	ev_set_minimum_height (value: INTEGER_32)
    			-- Make `value' the new minimum_height of `Current'.
    			-- Should check if the user didn't set the minimum width
    			-- before setting a new value.
    			-- (from EV_SIZEABLE_PRIMITIVE_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True

    	ev_set_minimum_size (mw, mh: INTEGER_32)
    			-- Make `mw' the new minimum_width and `mh' the new
    			-- minimum_height of `Current'.
    			-- Should check if the user didn't set the minimum width
    			-- before setting a new value.
    			-- (from EV_SIZEABLE_PRIMITIVE_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True

    	ev_set_minimum_width (value: INTEGER_32)
    			-- Make `value' the new minimum_width of `Current'.
    			-- Should check if the user didn't set the minimum width
    			-- before setting a new value.
    			-- (from EV_SIZEABLE_PRIMITIVE_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True

    	focus_on_widget: CELL [EV_WIDGET_IMP]
    			-- Widget that has currently the focus.
    			-- (from EV_WIDGET_IMP)

    	wel_font: WEL_FONT
    			-- Font with which the control is drawing its text.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists
    		ensure -- from WEL_CONTROL
    			result_not_void: Result /= Void

    	foreground_color: EV_COLOR
    			-- Color used for the foreground of `Current'.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_COLORIZABLE_I
    			True

    	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)

    	get_parent_item (an_item: WEL_TREE_VIEW_ITEM): WEL_TREE_VIEW_ITEM
    			-- Return the parent item of the given item.
    			-- (from WEL_TREE_VIEW)

    	has_return_value: BOOLEAN
    			-- Should the window procedure return a value?
    			-- (from WEL_RETURN_VALUE)

    	height: INTEGER_32
    			-- Height of `Current'.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from  EV_POSITIONED_I
    			True

    	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

    	i_th (i: INTEGER_32): like item
    			-- Item at `i'-th position.
    			-- (from EV_DYNAMIC_LIST_IMP)
    		require -- from EV_DYNAMIC_LIST_I
    			i_within_bounds: i > 0 and then i <= count
    		ensure -- from EV_DYNAMIC_LIST_I
    			not_void: Result /= Void

    	id: INTEGER_32
    			-- Control id
    			-- (from WEL_CONTROL)

    	index: INTEGER_32
    			-- Index of current position
    			-- (from EV_DYNAMIC_LIST_I)

    	index_of (v: like item; i: INTEGER_32): INTEGER_32
    			-- Index of i_th item `v', if present.
    			-- As dynamic list descendants are all sets,
    			-- Result will be zero for all values of `i'
    			-- that are not equal to one
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			positive_occurances: i > 0

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

    	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_TREE_NODE
    			-- Current item
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			readable: index > 0 and then index <= count
    		ensure -- from EV_DYNAMIC_LIST_I
    			not_void: Result /= Void

    	wel_item: POINTER
    			-- Generic Windows handle or structure pointer.
    			-- Can be a HWND, HICON, RECT *, WNDCLASS *, etc...
    			-- (from WEL_ANY)

    	item_by_data (data: ANY): like item
    			-- First item with `data'.
    			-- (from EV_ITEM_LIST_I)
    		require -- from EV_ITEM_LIST_I
    			data_not_void: data /= Void

    	key_code_from_key_string (key_string: STRING_GENERAL): INTEGER_32
    			-- Key code value from `key_string'
    			-- (from EV_KEY_CONSTANTS)
    		require -- from EV_KEY_CONSTANTS
    			key_string_not_void: key_string /= Void

    	key_strings: ARRAY [STRING_32]
    			-- String representations of all key codes.
    			-- (from EV_KEY_CONSTANTS)

    	last_item: POINTER
    			-- Handle of the last item inserted
    			-- (from WEL_TREE_VIEW)

    	message_return_value: POINTER
    			-- Return value of the window procedure.
    			-- (from WEL_RETURN_VALUE)
    		require -- from WEL_RETURN_VALUE
    			has_return_value: has_return_value

    	minimum_height: INTEGER_32
    			-- Lower bound on height in pixels.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from  EV_POSITIONED_I
    			True

    	minimum_width: INTEGER_32
    			-- Lower bound on width in pixels.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from  EV_POSITIONED_I
    			True

    	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)

    	off: BOOLEAN
    			-- Is there no current item?
    			-- (from EV_DYNAMIC_LIST_I)

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

    	original_pressure: REAL_64
    			-- Hold the values passed to start transport so when a transport
    			-- actually starts, with real_start_transport,these can be passed
    			-- as arguments.
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	original_x: INTEGER_32
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	original_x_tilt: REAL_64
    			-- Hold the values passed to start transport so when a transport
    			-- actually starts, with real_start_transport,these can be passed
    			-- as arguments.
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	original_y: INTEGER_32
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	original_y_tilt: REAL_64
    			-- Hold the values passed to start transport so when a transport
    			-- actually starts, with real_start_transport,these can be passed
    			-- as arguments.
    			-- (from EV_SHARED_TRANSPORT_IMP)

    	parent: EV_CONTAINER
    			-- Parent of `Current'
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_WIDGET_I
    			True

    	wel_parent: WEL_WINDOW
    			-- Parent window
    			-- (from WEL_WINDOW)

    	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)

    	pixmaps_height: INTEGER_32
    			-- Height of displayed pixmaps in `Current'.
    			-- (from EV_ITEM_PIXMAP_SCALER_I)

    	pixmaps_width: INTEGER_32
    			-- Width of displayed pixmaps in `Current'.
    			-- (from EV_ITEM_PIXMAP_SCALER_I)

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

    	pointer_style: EV_POINTER_STYLE
    			-- Pointer displayed when the pointing device is over `Current'.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_DOCKABLE_SOURCE_IMP
    			True
    		require -- from  EV_WIDGET_I
    			True

    	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)

    	retrieve_item_by_data (data: ANY; should_compare_objects: BOOLEAN): EV_TREE_NODE
    			-- `Result' is first item in `Current' with data
    			-- matching `some_data'. Compare objects if
    			-- `should_compare_objects' otherwise compare references.
    			-- (from EV_DYNAMIC_LIST_I)

    	retrieve_items_by_data (data: ANY; should_compare_objects: BOOLEAN): ARRAYED_LIST [EV_TREE_NODE]
    			-- `Result' is all items in `Current' with data
    			-- matching `some_data'. Compare objects if
    			-- `should_compare_objects' otherwise compare references.
    			-- (from EV_DYNAMIC_LIST_I)

    	screen_x: INTEGER_32
    			-- Horizontal offset of `Current' relative to screen
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_POSITIONED_I
    			True
    		require -- from  EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP
    			True
    		require -- from  EV_ITEM_LIST_IMP
    			True

    	screen_y: INTEGER_32
    			-- Vertical offset of `Current' relative to screen.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_POSITIONED_I
    			True
    		require -- from  EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP
    			True
    		require -- from  EV_ITEM_LIST_IMP
    			True

    	selected_item: EV_TREE_NODE
    			-- Currently selected item.

    	selected_item_imp: EV_TREE_NODE_IMP
    			-- Currently selected_item_imp.
    			-- Added for speed, if we did not have this,
    			-- then we would have to do another reverse assigment
    			-- after selected_item to get the _IMP.

    	top_level_window: EV_WINDOW
    			-- Top level window that contains `Current'.
    			-- (from EV_WIDGET_IMP)

    	top_level_window_imp: EV_WINDOW_IMP
    			-- Top level window that contains `Current'.
    			-- (from EV_PRIMITIVE_IMP)

    	transport_executing: BOOLEAN
    			-- Is a pick and drop or drag and drop currently
    			-- being executed?
    			-- (from EV_PICK_AND_DROPABLE_IMP)

    	vk_0: INTEGER_32 is 48
    			-- (from WEL_VK_CONSTANTS)

    	vk_1: INTEGER_32 is 49
    			-- (from WEL_VK_CONSTANTS)

    	vk_2: INTEGER_32 is 50
    			-- (from WEL_VK_CONSTANTS)

    	vk_3: INTEGER_32 is 51
    			-- (from WEL_VK_CONSTANTS)

    	vk_4: INTEGER_32 is 52
    			-- (from WEL_VK_CONSTANTS)

    	vk_5: INTEGER_32 is 53
    			-- (from WEL_VK_CONSTANTS)

    	vk_6: INTEGER_32 is 54
    			-- (from WEL_VK_CONSTANTS)

    	vk_7: INTEGER_32 is 55
    			-- (from WEL_VK_CONSTANTS)

    	vk_8: INTEGER_32 is 56
    			-- (from WEL_VK_CONSTANTS)

    	vk_9: INTEGER_32 is 57
    			-- Vk_a thru Vk_z are the same as their ASCII equivalents: 'A' thru 'Z'.
    			-- (from WEL_VK_CONSTANTS)

    	vk_a: INTEGER_32 is 65
    			-- (from WEL_VK_CONSTANTS)

    	vk_add: INTEGER_32 is 107
    			-- Declared in Windows as VK_ADD
    			-- (from WEL_VK_CONSTANTS)

    	vk_alt: INTEGER_32 is 18
    			-- Declared in Windows as VK_MENU
    			-- Was declared in WEL_VK_CONSTANTS as synonym of Vk_menu.
    			-- (from WEL_VK_CONSTANTS)

    	vk_apps: INTEGER_32 is 93
    			-- Declared in Windows as VK_APPS
    			-- Vk_0 thru Vk_9 are the same as their ASCII equivalents: '0' thru '9'.
    			-- (from WEL_VK_CONSTANTS)

    	vk_b: INTEGER_32 is 66
    			-- (from WEL_VK_CONSTANTS)

    	vk_back: INTEGER_32 is 8
    			-- Declared in Windows as VK_BACK
    			-- (from WEL_VK_CONSTANTS)

    	vk_c: INTEGER_32 is 67
    			-- (from WEL_VK_CONSTANTS)

    	vk_cancel: INTEGER_32 is 3
    			-- Declared in Windows as VK_CANCEL
    			-- (from WEL_VK_CONSTANTS)

    	vk_capital: INTEGER_32 is 20
    			-- Declared in Windows as VK_CAPITAL
    			-- (from WEL_VK_CONSTANTS)

    	vk_clear: INTEGER_32 is 12
    			-- Declared in Windows as VK_CLEAR
    			-- (from WEL_VK_CONSTANTS)

    	vk_control: INTEGER_32 is 17
    			-- Declared in Windows as VK_CONTROL
    			-- (from WEL_VK_CONSTANTS)

    	vk_d: INTEGER_32 is 68
    			-- (from WEL_VK_CONSTANTS)

    	vk_decimal: INTEGER_32 is 110
    			-- Declared in Windows as VK_DECIMAL
    			-- (from WEL_VK_CONSTANTS)

    	vk_delete: INTEGER_32 is 46
    			-- Declared in Windows as VK_DELETE
    			-- (from WEL_VK_CONSTANTS)

    	vk_divide: INTEGER_32 is 111
    			-- Declared in Windows as VK_DIVIDE
    			-- (from WEL_VK_CONSTANTS)

    	vk_down: INTEGER_32 is 40
    			-- Declared in Windows as VK_DOWN
    			-- (from WEL_VK_CONSTANTS)

    	vk_e: INTEGER_32 is 69
    			-- (from WEL_VK_CONSTANTS)

    	vk_end: INTEGER_32 is 35
    			-- Declared in Windows as VK_END
    			-- (from WEL_VK_CONSTANTS)

    	vk_escape: INTEGER_32 is 27
    			-- Declared in Windows as VK_ESCAPE
    			-- (from WEL_VK_CONSTANTS)

    	vk_execute: INTEGER_32 is 43
    			-- Declared in Windows as VK_EXECUTE
    			-- (from WEL_VK_CONSTANTS)

    	vk_f: INTEGER_32 is 70
    			-- (from WEL_VK_CONSTANTS)

    	vk_f1: INTEGER_32 is 112
    			-- Declared in Windows as VK_F1
    			-- (from WEL_VK_CONSTANTS)

    	vk_f10: INTEGER_32 is 121
    			-- Declared in Windows as VK_F10
    			-- (from WEL_VK_CONSTANTS)

    	vk_f11: INTEGER_32 is 122
    			-- Declared in Windows as VK_F11
    			-- (from WEL_VK_CONSTANTS)

    	vk_f12: INTEGER_32 is 123
    			-- Declared in Windows as VK_F12
    			-- (from WEL_VK_CONSTANTS)

    	vk_f13: INTEGER_32 is 124
    			-- Declared in Windows as VK_F13
    			-- (from WEL_VK_CONSTANTS)

    	vk_f14: INTEGER_32 is 125
    			-- Declared in Windows as VK_F14
    			-- (from WEL_VK_CONSTANTS)

    	vk_f15: INTEGER_32 is 126
    			-- Declared in Windows as VK_F15
    			-- (from WEL_VK_CONSTANTS)

    	vk_f16: INTEGER_32 is 127
    			-- Declared in Windows as VK_F16
    			-- (from WEL_VK_CONSTANTS)

    	vk_f17: INTEGER_32 is 128
    			-- Declared in Windows as VK_F17
    			-- (from WEL_VK_CONSTANTS)

    	vk_f18: INTEGER_32 is 129
    			-- Declared in Windows as VK_F18
    			-- (from WEL_VK_CONSTANTS)

    	vk_f19: INTEGER_32 is 130
    			-- Declared in Windows as VK_F19
    			-- (from WEL_VK_CONSTANTS)

    	vk_f2: INTEGER_32 is 113
    			-- Declared in Windows as VK_F2
    			-- (from WEL_VK_CONSTANTS)

    	vk_f20: INTEGER_32 is 131
    			-- Declared in Windows as VK_F20
    			-- (from WEL_VK_CONSTANTS)

    	vk_f21: INTEGER_32 is 132
    			-- Declared in Windows as VK_F21
    			-- (from WEL_VK_CONSTANTS)

    	vk_f22: INTEGER_32 is 133
    			-- Declared in Windows as VK_F22
    			-- (from WEL_VK_CONSTANTS)

    	vk_f23: INTEGER_32 is 134
    			-- Declared in Windows as VK_F23
    			-- (from WEL_VK_CONSTANTS)

    	vk_f24: INTEGER_32 is 135
    			-- Declared in Windows as VK_F24
    			-- (from WEL_VK_CONSTANTS)

    	vk_f3: INTEGER_32 is 114
    			-- Declared in Windows as VK_F3
    			-- (from WEL_VK_CONSTANTS)

    	vk_f4: INTEGER_32 is 115
    			-- Declared in Windows as VK_F4
    			-- (from WEL_VK_CONSTANTS)

    	vk_f5: INTEGER_32 is 116
    			-- Declared in Windows as VK_F5
    			-- (from WEL_VK_CONSTANTS)

    	vk_f6: INTEGER_32 is 117
    			-- Declared in Windows as VK_F6
    			-- (from WEL_VK_CONSTANTS)

    	vk_f7: INTEGER_32 is 118
    			-- Declared in Windows as VK_F7
    			-- (from WEL_VK_CONSTANTS)

    	vk_f8: INTEGER_32 is 119
    			-- Declared in Windows as VK_F8
    			-- (from WEL_VK_CONSTANTS)

    	vk_f9: INTEGER_32 is 120
    			-- Declared in Windows as VK_F9
    			-- (from WEL_VK_CONSTANTS)

    	vk_g: INTEGER_32 is 71
    			-- (from WEL_VK_CONSTANTS)

    	vk_h: INTEGER_32 is 72
    			-- (from WEL_VK_CONSTANTS)

    	vk_help: INTEGER_32 is 47
    			-- Declared in Windows as VK_HELP
    			-- (from WEL_VK_CONSTANTS)

    	vk_home: INTEGER_32 is 36
    			-- Declared in Windows as VK_HOME
    			-- (from WEL_VK_CONSTANTS)

    	vk_i: INTEGER_32 is 73
    			-- (from WEL_VK_CONSTANTS)

    	vk_insert: INTEGER_32 is 45
    			-- Declared in Windows as VK_INSERT
    			-- (from WEL_VK_CONSTANTS)

    	vk_j: INTEGER_32 is 74
    			-- (from WEL_VK_CONSTANTS)

    	vk_k: INTEGER_32 is 75
    			-- (from WEL_VK_CONSTANTS)

    	vk_l: INTEGER_32 is 76
    			-- (from WEL_VK_CONSTANTS)

    	vk_lbutton: INTEGER_32 is 1
    			-- Declared in Windows as VK_LBUTTON
    			-- (from WEL_VK_CONSTANTS)

    	vk_lcontrol: INTEGER_32 is 162
    			-- Declared in Windows as VK_LCONTROL
    			-- (from WEL_VK_CONSTANTS)

    	vk_left: INTEGER_32 is 37
    			-- Declared in Windows as VK_LEFT
    			-- (from WEL_VK_CONSTANTS)

    	vk_lmenu: INTEGER_32 is 164
    			-- Declared in Windows as VK_LMENU
    			-- (from WEL_VK_CONSTANTS)

    	vk_lshift: INTEGER_32 is 160
    			-- Declared in Windows as VK_LSHIFT
    			-- (from WEL_VK_CONSTANTS)

    	vk_m: INTEGER_32 is 77
    			-- (from WEL_VK_CONSTANTS)

    	vk_mbutton: INTEGER_32 is 4
    			-- Declared in Windows as VK_MBUTTON
    			-- (from WEL_VK_CONSTANTS)

    	vk_menu: INTEGER_32 is 18
    			-- Declared in Windows as VK_MENU
    			-- Was declared in WEL_VK_CONSTANTS as synonym of Vk_alt.
    			-- (from WEL_VK_CONSTANTS)

    	vk_multiply: INTEGER_32 is 106
    			-- Declared in Windows as VK_MULTIPLY
    			-- (from WEL_VK_CONSTANTS)

    	vk_n: INTEGER_32 is 78
    			-- (from WEL_VK_CONSTANTS)

    	vk_next: INTEGER_32 is 34
    			-- Declared in Windows as VK_NEXT
    			-- (from WEL_VK_CONSTANTS)

    	vk_numlock: INTEGER_32 is 144
    			-- Declared in Windows as VK_NUMLOCK
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad0: INTEGER_32 is 96
    			-- Declared in Windows as VK_NUMPAD0
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad1: INTEGER_32 is 97
    			-- Declared in Windows as VK_NUMPAD1
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad2: INTEGER_32 is 98
    			-- Declared in Windows as VK_NUMPAD2
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad3: INTEGER_32 is 99
    			-- Declared in Windows as VK_NUMPAD3
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad4: INTEGER_32 is 100
    			-- Declared in Windows as VK_NUMPAD4
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad5: INTEGER_32 is 101
    			-- Declared in Windows as VK_NUMPAD5
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad6: INTEGER_32 is 102
    			-- Declared in Windows as VK_NUMPAD6
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad7: INTEGER_32 is 103
    			-- Declared in Windows as VK_NUMPAD7
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad8: INTEGER_32 is 104
    			-- Declared in Windows as VK_NUMPAD8
    			-- (from WEL_VK_CONSTANTS)

    	vk_numpad9: INTEGER_32 is 105
    			-- Declared in Windows as VK_NUMPAD9
    			-- (from WEL_VK_CONSTANTS)

    	vk_o: INTEGER_32 is 79
    			-- (from WEL_VK_CONSTANTS)

    	vk_p: INTEGER_32 is 80
    			-- (from WEL_VK_CONSTANTS)

    	vk_pause: INTEGER_32 is 19
    			-- Declared in Windows as VK_PAUSE
    			-- (from WEL_VK_CONSTANTS)

    	vk_print: INTEGER_32 is 42
    			-- Declared in Windows as VK_PRINT
    			-- (from WEL_VK_CONSTANTS)

    	vk_prior: INTEGER_32 is 33
    			-- Declared in Windows as VK_PRIOR
    			-- (from WEL_VK_CONSTANTS)

    	vk_q: INTEGER_32 is 81
    			-- (from WEL_VK_CONSTANTS)

    	vk_r: INTEGER_32 is 82
    			-- (from WEL_VK_CONSTANTS)

    	vk_rbutton: INTEGER_32 is 2
    			-- Declared in Windows as VK_RBUTTON
    			-- (from WEL_VK_CONSTANTS)

    	vk_rcontrol: INTEGER_32 is 163
    			-- Declared in Windows as VK_RCONTROL
    			-- (from WEL_VK_CONSTANTS)

    	vk_return: INTEGER_32 is 13
    			-- Declared in Windows as VK_RETURN
    			-- (from WEL_VK_CONSTANTS)

    	vk_right: INTEGER_32 is 39
    			-- Declared in Windows as VK_RIGHT
    			-- (from WEL_VK_CONSTANTS)

    	vk_rmenu: INTEGER_32 is 165
    			-- Declared in Windows as VK_RMENU
    			-- (from WEL_VK_CONSTANTS)

    	vk_rshift: INTEGER_32 is 161
    			-- Declared in Windows as VK_RSHIFT
    			-- (from WEL_VK_CONSTANTS)

    	vk_s: INTEGER_32 is 83
    			-- (from WEL_VK_CONSTANTS)

    	vk_scroll: INTEGER_32 is 145
    			-- Declared in Windows as VK_SCROLL
    			-- (from WEL_VK_CONSTANTS)

    	vk_select: INTEGER_32 is 41
    			-- Declared in Windows as VK_SELECT
    			-- (from WEL_VK_CONSTANTS)

    	vk_separator: INTEGER_32 is 108
    			-- Declared in Windows as VK_SEPARATOR
    			-- (from WEL_VK_CONSTANTS)

    	vk_shift: INTEGER_32 is 16
    			-- Declared in Windows as VK_SHIFT
    			-- (from WEL_VK_CONSTANTS)

    	vk_snapshot: INTEGER_32 is 44
    			-- Declared in Windows as VK_SNAPSHOT
    			-- (from WEL_VK_CONSTANTS)

    	vk_space: INTEGER_32 is 32
    			-- Declared in Windows as VK_SPACE
    			-- (from WEL_VK_CONSTANTS)

    	vk_subtract: INTEGER_32 is 109
    			-- Declared in Windows as VK_SUBTRACT
    			-- (from WEL_VK_CONSTANTS)

    	vk_t: INTEGER_32 is 84
    			-- (from WEL_VK_CONSTANTS)

    	vk_tab: INTEGER_32 is 9
    			-- Declared in Windows as VK_TAB
    			-- (from WEL_VK_CONSTANTS)

    	vk_u: INTEGER_32 is 85
    			-- (from WEL_VK_CONSTANTS)

    	vk_up: INTEGER_32 is 38
    			-- Declared in Windows as VK_UP
    			-- (from WEL_VK_CONSTANTS)

    	vk_v: INTEGER_32 is 86
    			-- (from WEL_VK_CONSTANTS)

    	vk_w: INTEGER_32 is 87
    			-- (from WEL_VK_CONSTANTS)

    	vk_x: INTEGER_32 is 88
    			-- (from WEL_VK_CONSTANTS)

    	vk_y: INTEGER_32 is 89
    			-- (from WEL_VK_CONSTANTS)

    	vk_z: INTEGER_32 is 90
    			-- (from WEL_VK_CONSTANTS)

    	widget_imp_at_pointer_position: EV_WIDGET_IMP
    			-- `Result' is implementation of widget at current
    			-- pointer position or Void if none.
    			-- (from EV_SHARED_TRANSPORT_IMP)
    		require -- from  EV_DOCKABLE_SOURCE_I
    			True

    	width: INTEGER_32
    			-- Width of `Current'.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from  EV_POSITIONED_I
    			True

    	x_position: INTEGER_32
    			-- `Result' is x_position of `Current' in pixels.
    			-- If wel_parent not Void then `Result' is relative to wel_parent else
    			-- `Result' is relative to screen.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from  EV_POSITIONED_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			wel_parent = Void implies Result = absolute_x

    	y_position: INTEGER_32
    			-- `Result' is x_position of `Current' in pixels.
    			-- If wel_parent not Void then `Result' is relative to wel_parent else
    			-- `Result' is relative to screen.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from  EV_POSITIONED_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			wel_parent = Void implies Result = absolute_y

    feature -- Measurement

    	count: INTEGER_32
    			-- Number of items.
    			-- (from EV_DYNAMIC_LIST_IMP)
    		require -- from  EV_DYNAMIC_LIST_I
    			True

    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

    	absolute_x: INTEGER_32
    			-- Absolute x position
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			Result = window_rect.x

    	absolute_y: INTEGER_32
    			-- Absolute y position
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			Result = window_rect.y

    	background_brush: WEL_BRUSH
    			-- Current window background color used to refresh the window when
    			-- requested by the WM_ERASEBKGND windows message.
    			-- By default there is no background
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			new_object: Result /= Void implies Result /= background_brush

    	captured_window: WEL_WINDOW
    			-- Current window which has been captured.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			window_captured: window_captured

    	client_rect: WEL_RECT
    			-- Client rectangle
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	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

    	command (message: INTEGER_32): WEL_COMMAND
    			-- Command associated to `message'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0
    			command_exists: command_exists (message)
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	command_argument (message: INTEGER_32): ANY
    			-- Command argument associated to `message'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0
    			command_exists: command_exists (message)

    	command_exists (message: INTEGER_32): BOOLEAN
    			-- Does a command associated to `message' exist?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0

    	commands_enabled: BOOLEAN
    			-- Is the commands execution enabled?
    			-- (from WEL_WINDOW)

    	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

    	total_count: INTEGER_32
    			-- Number of items in the tree view window
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    		ensure -- from WEL_TREE_VIEW
    			positive_result: Result >= 0

    	destroyed: BOOLEAN
    			-- Is `Current' destroyed ?
    			-- (from EV_WIDGET_IMP)

    	is_sensitive: BOOLEAN
    			-- Is the window enabled for mouse and keyboard input?
    			-- (from WEL_WINDOW)
    		require -- from  EV_SENSITIVE_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	ex_style: INTEGER_32
    			-- Window ex_style
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	exists: BOOLEAN
    			-- Does the item exist?
    			-- (from WEL_ANY)
    		require -- from  EV_WIDGET_IMP
    			True
    		ensure -- from WEL_ANY
    			Result = (wel_item /= default_pointer)

    	find_item_recursively_by_data (data: ANY): EV_TREE_NODE
    			-- If `data' contained in a tree item at any level then
    			-- assign this item to `Result'.
    			-- (from EV_TREE_NODE_LIST_I)
    		ensure -- from EV_TREE_NODE_LIST_I
    			index_not_changed: old interface.index = interface.index

    	focused_window: WEL_WINDOW
    			-- Current window which has the focus.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	foreground_window: WEL_WINDOW
    			-- Foreground window (window with focus)
    			-- (from WEL_WINDOWS_ROUTINES)

    	get_background_color: WEL_COLOR_REF
    			-- `Result' is background color used for control.
    			-- (from WEL_TREE_VIEW)

    	get_image_list: WEL_IMAGE_LIST
    			-- Get the image list associated with this treeview.
    			-- Returns Void if none.
    			-- (from WEL_TREE_VIEW)

    	get_item_rect (an_item: WEL_TREE_VIEW_ITEM): WEL_RECT
    			-- `Result' is rect of item `an_item' or `Void'
    			-- if `an_item' is not visible.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			an_item_not_void: an_item /= Void

    	get_item_text_rect (an_item: WEL_TREE_VIEW_ITEM): WEL_RECT
    			-- `Result' is rect for text of `an_item' or `Void'
    			-- if `an_item' is not visible.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			an_item_not_void: an_item /= 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

    	get_text_color: WEL_COLOR_REF
    			-- `Result' is color for item text.
    			-- (from WEL_TREE_VIEW)

    	get_tooltip: WEL_TOOLTIP
    			-- `Result' is tooltip associated with `Current'.
    			-- (from WEL_TREE_VIEW)

    	has (v: like item): BOOLEAN
    			-- Does structure contain `v'?
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			v_not_void: v /= Void

    	has_capture: BOOLEAN
    			-- Does `Current' have capture?
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_WIDGET_I
    			True

    	wel_has_capture: BOOLEAN
    			-- Does this window have the capture?
    			-- (from WEL_WINDOW)
    		require -- from  EV_DOCKABLE_SOURCE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	has_focus: BOOLEAN
    			-- Does this window have the focus?
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	has_heavy_capture: BOOLEAN
    			-- Does this window have the heavy capture?
    			-- (from WEL_WINDOW)

    	has_horizontal_scroll_bar: BOOLEAN
    			-- Does this window have a horizontal scroll bar?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	has_item (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Does `an_item' exist in the tree?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			item_not_void: an_item /= Void
    			item_valid: an_item.exists
    		ensure -- from WEL_TREE_VIEW
    			mask_unchanged: an_item.mask = old an_item.mask

    	has_recursively (an_item: like item): BOOLEAN
    			-- Does `Current' contain `an_item' at any level?
    			-- (from EV_TREE_NODE_LIST_I)
    		ensure -- from EV_TREE_NODE_LIST_I
    			index_not_changed: old interface.index = interface.index

    	has_system_font: BOOLEAN
    			-- Does the control use the system font?
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists

    	has_vertical_scroll_bar: BOOLEAN
    			-- Does this window have a vertical scroll bar?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	heavy_capture_activated: BOOLEAN
    			-- Is the heavy capture currently running?
    			-- (i.e. is there a window in the current program
    			-- with has_heavy_capture to True?)
    			-- (from WEL_WINDOW)

    	wel_height: INTEGER_32
    			-- Window height
    			-- (from WEL_WINDOW)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	indent: INTEGER_32
    			-- Amout, in pixels, that child items are indented
    			-- relative to their parent items.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

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

    	is_bold (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Is `an_item' bold?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	is_cut (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Is `an_item' selected as part of a cut and paste
    			-- operation?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	is_drophilited (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Is `an_item' selected as a drag ans drop target?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	is_expanded (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Is `an_item' expanded?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	is_inside: BOOLEAN
    			-- Is the current window inside another window?
    			-- (from WEL_WINDOW)

    	is_parent (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Is `an_item' a parent of other items?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	is_selected (an_item: WEL_TREE_VIEW_ITEM): BOOLEAN
    			-- Is `an_item' selected?
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	is_show_requested: BOOLEAN
    			-- Is `Current' displayed in its parent?
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from  EV_WIDGET_I
    			True

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

    	is_window (hwnd: POINTER): BOOLEAN
    			-- Does `hwnd' point to a valid Window?
    			-- (from WEL_WINDOWS_ROUTINES)

    	key_down (virtual_key: INTEGER_32): BOOLEAN
    			--Is 'virtual' key pressed
    			-- (from WEL_WINDOWS_ROUTINES)

    	key_locked (virtual_key: INTEGER_32): BOOLEAN
    			--Is 'virtual' key locked
    			-- (from WEL_WINDOWS_ROUTINES)

    	key_to_string (key_data: INTEGER_32): STRING_32
    			-- Give the string associated with the key given by
    			-- `virtual_key'.
    			-- (from WEL_WINDOWS_ROUTINES)

    	managed: BOOLEAN is True
    			-- All widgets are managed.
    			-- (from EV_WIDGET_IMP)

    	maximal_height: INTEGER_32
    			-- Maximal height allowed for the window
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			result_large_enough: Result >= minimal_height

    	maximal_width: INTEGER_32
    			-- Maximal width allowed for the window
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			result_large_enough: Result >= minimal_width

    	maximized: BOOLEAN
    			-- Is the window maximized?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	minimal_height: INTEGER_32
    			-- Minimal height allowed for the window
    			-- Zero by default.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			positive_result: Result >= 0
    			result_small_enough: Result <= maximal_height

    	minimal_width: INTEGER_32
    			-- Minimal width allowed for the window
    			-- Zero by default.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			positive_result: Result >= 0
    			result_small_enough: Result <= maximal_width

    	minimized: BOOLEAN
    			-- Is the window minimized?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	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)

    	placement: WEL_WINDOW_PLACEMENT
    			-- Window placement information
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	recursive_do_all (action: PROCEDURE [ANY, TUPLE [EV_TREE_NODE]])
    			-- Apply `action' to every item.
    			-- Semantics not guaranteed if `action' changes the structure;
    			-- (from EV_TREE_NODE_LIST_I)

    	retrieve_item_recursively_by_data (data: ANY; should_compare_objects: BOOLEAN): EV_TREE_NODE
    			-- If `data' contained in a tree item at any level then
    			-- assign this item to `Result'. Compare objects if
    			-- `should_compare_objects' otherwise compare references.
    			-- (from EV_TREE_NODE_LIST_I)
    		ensure -- from EV_TREE_NODE_LIST_I
    			index_not_changed: old interface.index = interface.index

    	retrieve_items_recursively_by_data (data: ANY; should_compare_objects: BOOLEAN): ARRAYED_LIST [EV_TREE_NODE]
    			-- `Result' is all tree items contained in `Current' at any level,
    			-- with data matching `data'. Compare objects if
    			-- `should_compare_objects' otherwise compare references.
    			-- (from EV_TREE_NODE_LIST_I)
    		ensure -- from EV_TREE_NODE_LIST_I
    			result_not_void: Result /= Void

    	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))

    	selected: BOOLEAN
    			-- Is an item selected?
    			-- (from WEL_TREE_VIEW)
    		require -- from  EV_TREE_I
    			True
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	wel_selected_item: WEL_TREE_VIEW_ITEM
    			-- Return the currently selected item.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			selected: selected
    		ensure -- from WEL_TREE_VIEW
    			item_valid: Result.exists

    	shared: BOOLEAN
    			-- Is item shared by another object?
    			-- If False (by default), item will
    			-- be destroyed by destroy_item.
    			-- If True, item will not be destroyed.
    			-- (from WEL_ANY)

    	is_displayed: BOOLEAN
    			-- Is the window shown?
    			-- (from WEL_WINDOW)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from  EV_WIDGET_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	style: INTEGER_32
    			-- Window style
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	system_directory: STRING_32
    			-- Path of the Windows system directory
    			-- (from WEL_WINDOWS_ROUTINES)
    		ensure -- from WEL_WINDOWS_ROUTINES
    			result_not_void: Result /= Void

    	text: STRING_32
    			-- Window text
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	text_length: INTEGER_32
    			-- Text length
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			positive_result: Result >= 0

    	tick_count: INTEGER_32
    			-- Number of milliseconds that have
    			-- elapsed since Windows was started.
    			-- (from WEL_WINDOWS_ROUTINES)
    		ensure -- from WEL_WINDOWS_ROUTINES
    			positive_result: Result >= 0

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

    	valid_cursor (p: CURSOR): BOOLEAN
    			-- Can the cursor be moved to position `p'?
    			-- This is True if `p' conforms to EV_DYNAMIC_LIST_CURSOR and
    			-- if it points to an item, `Current' must have it.
    			-- (from EV_DYNAMIC_LIST_I)

    	visible_count: INTEGER_32
    			-- Number of items that will fit into the tree
    			-- view window
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    		ensure -- from WEL_TREE_VIEW
    			positive_result: Result >= 0

    	wel_width: INTEGER_32
    			-- Window width
    			-- (from WEL_WINDOW)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	window_captured: BOOLEAN
    			-- Has a window been captured?
    			-- (from WEL_WINDOW)

    	window_of_item (hwnd: POINTER): WEL_WINDOW
    			-- Retrieve Eiffel object associated with `hwnd' pointer.
    			-- (from WEL_WINDOWS_ROUTINES)
    		require -- from WEL_WINDOWS_ROUTINES
    			hwnd_not_null: hwnd /= default_pointer
    			is_window_pointer: is_window (hwnd)
    		ensure -- from WEL_WINDOWS_ROUTINES
    			is_wel_window: Result /= Void implies (create {INTERNAL}).type_conforms_to ((create {INTERNAL}).dynamic_type (Result), (create {INTERNAL}).dynamic_type_from_string ("WEL_WINDOW"))

    	window_rect: WEL_RECT
    			-- Window rectangle (absolute position)
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	windows_directory: STRING_32
    			-- Path of the Windows directory
    			-- (from WEL_WINDOWS_ROUTINES)
    		ensure -- from WEL_WINDOWS_ROUTINES
    			result_not_void: Result /= Void

    feature {ANY} -- Status report

    	valid_hwnd_constant (c: POINTER): BOOLEAN
    			-- Is `c' a valid hwnd constant?
    			-- (from WEL_HWND_CONSTANTS)

    feature -- Status setting

    	check_drag_and_drop_release (a_x, a_y: INTEGER_32)
    			-- End transport if in drag and drop.
    			-- (from EV_PICK_AND_DROPABLE_IMP)

    	check_dragable_release (a_x, a_y: INTEGER_32)
    			-- End transport if in drag and drop.
    			-- (from EV_DOCKABLE_SOURCE_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP
    			True

    	deselect_item (an_item: WEL_TREE_VIEW_ITEM)
    			-- Deselect the given item.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)
    		ensure -- from WEL_TREE_VIEW
    			item_deselected: not is_selected (an_item)

    	disable
    			-- Disable mouse and keyboard input
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			disabled: not is_sensitive

    	disable_capture
    			-- Release all user events.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_I
    			True
    		require -- from  EV_DOCKABLE_SOURCE_IMP
    			True

    	disable_commands
    			-- Disable commands execution.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			commands_disabled: not commands_enabled

    	disable_default_processing
    			-- Disable default window processing.
    			-- The standard window procedure will not be called for
    			-- each messages received by the window and then the
    			-- normal behavior will not occur.
    			-- (from WEL_WINDOW)
    		require -- from  EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP
    			True
    		require -- from  EV_WIDGET_IMP
    			True
    		ensure -- from WEL_WINDOW
    			default_processing_disabled: not default_processing

    	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_drag_accept_files
    			-- Disallow `Current' from being a file drag and drop target.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists

    	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_sensitive
    			-- Set `Current' to insensitive mode.
    			-- This means that any events with an
    			-- event type of KeyPress, KeyRelease,
    			-- ButtonPress, ButtonRelease, MotionNotify,
    			-- EnterNotify, LeaveNotify, FocusIn or
    			-- FocusOut will not be dispatched to current
    			-- widget and to all its children.  Set it to
    			-- sensitive mode otherwise.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SENSITIVE_I
    			True

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

    	dragable_motion (a_x, a_y, a_screen_x, a_screen_y: INTEGER_32)
    			-- If in drag/pick and drop then update.
    			-- (from EV_DOCKABLE_SOURCE_IMP)

    	dragable_press (a_x, a_y, a_button, a_screen_x, a_screen_y: INTEGER_32)
    			-- Process `a_button' to start/stop the drag/pick and
    			-- drop mechanism.
    			-- (from EV_DOCKABLE_SOURCE_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP
    			True

    	enable
    			-- Enable mouse and keyboard input.
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			enabled: is_sensitive

    	enable_capture
    			-- Enable capture.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_I
    			True

    	enable_commands
    			-- Enable commands execution.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			commands_enabled: commands_enabled

    	enable_default_processing
    			-- Enable default window processing.
    			-- The standard window procedure will be called for
    			-- each messages received by the window and then the
    			-- normal behavior will occur.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			default_processing_enabled: default_processing

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

    	enable_drag_accept_files
    			-- Allow `Current' to be a file drag and drop target.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists

    	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_sensitive
    			-- Set `Current' to sensitive mode.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SENSITIVE_I
    			True

    	enable_transport
    			-- Activate pick/drag and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE_IMP)
    		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

    	has_parent: BOOLEAN
    			-- Is `Current' parented?
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SENSITIVE_I
    			True

    	hide
    			-- Hide `Current'.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_WIDGET_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			hidden: not is_displayed

    	maximize
    			-- Maximize the window
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			maximized: maximized

    	minimize
    			-- Minimize the window and display its icon
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			minimized: minimized

    	parent_is_sensitive: BOOLEAN
    			-- Is parent of `Current' sensitive?
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_SENSITIVE_I
    			True

    	pnd_motion (a_x, a_y, a_screen_x, a_screen_y: INTEGER_32)
    			-- If in drag/pick and drop then update.
    			-- (from EV_PICK_AND_DROPABLE_IMP)

    	release_capture
    			-- Release the mouse capture after a call
    			-- to set_capture.
    			-- (from WEL_WINDOW)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True
    		require -- from  EV_DOCKABLE_SOURCE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    			has_capture: wel_has_capture
    		ensure -- from WEL_WINDOW
    			not_has_capture: not wel_has_capture

    	release_heavy_capture
    			-- Release the mouse capture after a call
    			-- to set_heavy_capture.
    			-- (from WEL_WINDOW)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    			has_heavy_capture: has_heavy_capture
    			heavy_capture_activated: heavy_capture_activated
    		ensure -- from WEL_WINDOW
    			heavy_capture_set: not has_heavy_capture
    			heavy_capture_deactivated: not heavy_capture_activated

    	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_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

    	restore
    			-- Restore the window to its
    			-- original size and position after
    			-- minimize or maximize
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	select_drop_target (an_item: WEL_TREE_VIEW_ITEM)
    			-- Redraw the given `an_item' in the style used to
    			-- indicate the target of a drag and drop operation.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	select_first_visible (an_item: WEL_TREE_VIEW_ITEM)
    			-- Scrolls the tree view vertically so that
    			-- the given `an_item' is the first visible item.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)

    	select_item (an_item: WEL_TREE_VIEW_ITEM)
    			-- Set the selection to the given `an_item'.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			valid_item: has_item (an_item)
    		ensure -- from WEL_TREE_VIEW
    			item_selected: is_selected (an_item)

    	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

    	wel_set_background_color (a_color: WEL_COLOR_REF)
    			-- Assign `a_color' to background color.
    			-- (from WEL_TREE_VIEW)

    	set_capture
    			-- Set the mouse capture to the `Current' window.
    			-- Once the window has captured the mouse, all
    			-- mouse input is directed to this window, regardless
    			-- of whether the cursor is over that window. Only
    			-- one window can have the mouse capture at a time.
    			--
    			-- Works only for windows in the same thread as your
    			-- application.
    			-- (from WEL_WINDOW)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True
    		require -- from  EV_DOCKABLE_SOURCE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    			has_not_capture: not wel_has_capture
    			has_not_heavy_capture: not has_heavy_capture
    		ensure -- from WEL_WINDOW
    			has_capture: wel_has_capture

    	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_default_minimum_size
    			-- Initialize the size of `Current'.
    			-- Redefined by many widgets.
    			-- (from EV_WIDGET_IMP)

    	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_ex_style (an_ex_style: INTEGER_32)
    			-- Set `an_ex_style' with ex_style.
    			--
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_focus
    			-- Set the focus to `Current'
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	set_heavy_capture
    			-- Set the mouse capture to the `Current' window.
    			-- Once the window has captured the mouse, all
    			-- mouse input is directed to this window, regardless
    			-- of whether the cursor is over that window. Only
    			-- one window can have the mouse capture at a time.
    			--
    			-- Works for ALL windows.
    			-- (from WEL_WINDOW)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    			has_not_heavy_capture: not has_heavy_capture
    			heavy_capture_deactivated: not heavy_capture_activated
    		ensure -- from WEL_WINDOW
    			heavy_capture_set: has_heavy_capture implies heavy_capture_activated

    	set_image_list (an_imagelist: WEL_IMAGE_LIST)
    			-- Set the current image list to `an_imagelist'.
    			-- If `an_imagelist' is set to Void, it removes
    			-- the current associated image list (if any).
    			-- (from WEL_TREE_VIEW)

    	set_indent (an_indent: INTEGER_32)
    			-- Set indent with `an_indent'.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	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_pixmaps_size (a_width: INTEGER_32; a_height: INTEGER_32)
    			-- Set the size of displayed pixmaps in `Current' to
    			-- `a_width' by `a_height'.
    			-- (from EV_ITEM_PIXMAP_SCALER_I)
    		ensure -- from EV_ITEM_PIXMAP_SCALER_I
    			width_set: pixmaps_width = a_width
    			height_set: pixmaps_height = a_height

    	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_shared
    			-- Set shared to True.
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			shared: shared

    	set_style (a_style: INTEGER_32)
    			-- Set style with `a_style'.
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	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_text_color (a_color: WEL_COLOR_REF)
    			-- Assign `a_color' to color of item text.
    			-- (from WEL_TREE_VIEW)

    	wel_set_tooltip (tooltip: WEL_TOOLTIP)
    			-- (from WEL_TREE_VIEW)

    	set_unshared
    			-- Set shared to False.
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			unshared: not shared

    	show
    			-- Show `Current'.
    			-- Need to notify the parent.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_WIDGET_I
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	update_cached_style (new_ex_style, old_ex_style: INTEGER_32)
    			-- Update Window cache buffer for Window style.
    			-- (from WEL_WINDOW)

    	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 -- Cursor movement

    	back
    			-- Move to previous item.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			not_before: index > 0

    	forth
    			-- Move cursor to next position.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			not_after: index <= count

    	go_i_th (i: INTEGER_32)
    			-- Move cursor to `i'-th position.
    			-- (from EV_DYNAMIC_LIST_I)

    	go_to (p: CURSOR)
    			-- Move cursor to position `p'.
    			-- (from EV_DYNAMIC_LIST_I)

    	move (i: INTEGER_32)
    			-- Move cursor `i' positions.
    			-- (from EV_DYNAMIC_LIST_I)

    	start
    			-- Move cursor to first position.
    			-- (from EV_DYNAMIC_LIST_I)
    		ensure -- from EV_DYNAMIC_LIST_I
    			index_on_first: index = 1

    feature -- Element change

    	append (s: SEQUENCE [EV_TREE_NODE])
    			-- Append a copy of `s'. Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			sequence_not_void: s /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			count_increased: old count + s.count = count

    	delete_item (an_item: WEL_TREE_VIEW_ITEM)
    			-- Remove `an_item' from the tree.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			item_not_void: an_item /= Void
    			valid_item: has_item (an_item)
    			has_items: total_count > 0

    	disable_redraw
    			-- Disable redrawing of `Current' until next call to enable_redraw.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	enable_redraw
    			-- Ensure `Current' is redrawn as required.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	extend (v: like item)
    			-- Add `v' to end. Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			v_not_void: v /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			has_v: has (v)

    	has_system_window_locked: BOOLEAN
    			-- Is there any window locked ?
    			-- (from WEL_WINDOW)

    	wel_insert_item (an_item: WEL_TREE_VIEW_INSERT_STRUCT)
    			-- Insert `an_item' in the tree.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			an_item_not_void: an_item /= Void
    			an_item_exists: an_item.exists
    		ensure -- from WEL_TREE_VIEW
    			new_count: total_count = old total_count + 1

    	lock_window_update
    			-- Disables drawing in the current window. A locked window cannot be moved.
    			-- Only one window can be locked at a time. To unlock a window locked with
    			-- lock_window_update , call 'unlock_window_update'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			has_system_window_locked

    	merge_left (other: like interface)
    			-- Merge `other' into current structure before cursor
    			-- position. Do not move cursor. Empty `other'.
    			-- (from EV_DYNAMIC_LIST_I)

    	merge_right (other: like interface)
    			-- Merge `other' into current structure after cursor
    			-- position. Do not move cursor. Empty `other'.
    			-- (from EV_DYNAMIC_LIST_I)

    	put_front (v: like item)
    			-- Add `v' at beginning. Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			v_not_void: v /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			has_v: has (v)

    	put_i_th (v: like item; i: INTEGER_32)
    			-- Replace item at `i'-th position by `v'.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			valid_index: i > 0 and i <= count
    			v_not_void: v /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			has_v: has (v)

    	put_left (v: like item)
    			-- Add `v' to the left of cursor position. Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			v_not_void: v /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			has_v: has (v)

    	put_right (v: like item)
    			-- Add `v' to the right of cursor position. Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			v_not_void: v /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			has_v: has (v)

    	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

    	replace (v: like item)
    			-- Replace current item by `v'.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			writable: index > 0 and then index <= count
    			v_not_void: v /= Void
    		ensure -- from EV_DYNAMIC_LIST_I
    			has_v: has (v)

    	reset_content
    			-- Remove all `items' from `Current'.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			has_items: total_count > 0

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

    	wel_set_font (a_font: WEL_FONT)
    			-- Set `font' with `a_font'.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists
    			a_font_not_void: a_font /= Void
    			a_font_exists: a_font.exists
    		ensure -- from WEL_CONTROL
    			font_set: not has_system_font implies wel_font.item = a_font.item

    	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_item (an_item: POINTER)
    			-- Set item with `an_item'
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			item_set: wel_item = an_item

    	set_parent (par: EV_CONTAINER)
    			-- Make `par' the new parent of the widget.
    			-- `par' can be Void then the parent is the
    			-- default_parent.
    			-- (from EV_PRIMITIVE_IMP)

    	wel_set_parent (a_parent: WEL_WINDOW)
    			-- Change the parent of the current window.
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	set_placement (a_placement: WEL_WINDOW_PLACEMENT)
    			-- Set placement with `a_placement'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			a_placement_not_void: a_placement /= Void

    	set_text (a_text: STRING_GENERAL)
    			-- Set the window text
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			text_set_when_not_void: a_text /= Void implies text.is_equal (a_text)
    			text_set_when_void: a_text = Void implies text.count = 0

    	set_timer (timer_id, time_out: INTEGER_32)
    			-- Set a timer identified by `timer_id' with a
    			-- `time_out' value (in milliseconds).
    			-- See also on_timer, kill_timer.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			positive_timer_id: timer_id > 0
    			positive_time_out: time_out > 0

    	set_tooltip (a_tooltip: STRING_GENERAL)
    			-- Assign `a_tooltip' to tooltip.
    			-- (from EV_TOOLTIPABLE_IMP)
    		require -- from EV_TOOLTIPABLE_I
    			a_tooltip_not_void: a_tooltip /= Void

    	set_top_level_window_imp (a_window: EV_WINDOW_IMP)
    			-- Make `a_window' the new top_level_window_imp
    			-- of `Current'.
    			-- (from EV_PRIMITIVE_IMP)

    	set_tree_item (an_item: WEL_TREE_VIEW_ITEM)
    			-- Set some or all of a tree view item's attributes.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists
    			item_exists: an_item /= Void and then an_item.exists
    			valid_item: has_item (an_item)
    			has_items: total_count > 0

    	set_x (a_x: INTEGER_32)
    			-- Set `x' with `a_x'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_y (a_y: INTEGER_32)
    			-- Set `y' with `a_y'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	unlock_window_update
    			-- Unlock a locked window.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    feature -- Removal

    	wel_destroy
    			-- Destroy the window.
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			not_exists: not exists

    	prune (v: like item)
    			-- Remove `v' if present. Do not move cursor, except if
    			-- cursor was on `v', move to right neighbor.
    			-- (from EV_DYNAMIC_LIST_I)
    		ensure -- from EV_DYNAMIC_LIST_I
    			cursor_not_moved: not old has (v) implies old interface.index = interface.index
    			cursor_not_moved: old has (v) and then old interface.index < old index_of (v, 1) implies index = old index
    			cursor_not_moved: old has (v) and then old interface.index >= old index_of (v, 1) implies index = old index - 1
    			not_has_v: not has (v)

    	remove
    			-- Remove current item. Move cursor to right neighbor
    			-- (or `after' if no right neighbor).
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			writable: not off
    		ensure -- from EV_DYNAMIC_LIST_I
    			not_has_v: not has (old item)

    	remove_left
    			-- Remove item to the left of cursor position.
    			-- Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			left_exists: index > 1
    			not_before: not (index = 0)
    		ensure then -- from EV_DYNAMIC_LIST_I
    			left_neighbor_removed: not has (old i_th (index - 1))

    	remove_right
    			-- Remove item to the right of cursor position.
    			-- Do not move cursor.
    			-- (from EV_DYNAMIC_LIST_I)
    		require -- from EV_DYNAMIC_LIST_I
    			right_exists: index < count
    		ensure then -- from EV_DYNAMIC_LIST_I
    			right_neighbor_removed: not has (old i_th (index + 1))

    	wipe_out
    			-- Remove all items.
    			-- (from EV_DYNAMIC_LIST_I)

    feature -- Resizing

    	set_height (value: INTEGER_32)
    			-- Make `value' the new height of `Current'.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_minimum_height (value: INTEGER_32)
    			-- Make `value' the new minimum_height of `Current'.
    			-- There is no need to grow `Current' if its size is
    			-- too small, the parent will do it if necessary.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_WIDGET_I
    			a_minimum_height_positive: value >= 0
    		ensure -- from EV_WIDGET_I
    			minimum_height_assigned: is_usable implies interface.minimum_height = value

    	set_minimum_size (mw, mh: INTEGER_32)
    			-- Make `mw' the new minimum_width and `mh' the new
    			-- minimum_height of `Current'.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_WIDGET_I
    			a_minimum_width_positive: mw >= 0
    			a_minimum_height_positive: mh >= 0
    		ensure -- from EV_WIDGET_I
    			minimum_width_assigned: is_usable implies interface.minimum_width = mw
    			minimum_height_assigned: is_usable implies interface.minimum_height = mh

    	set_minimum_width (value: INTEGER_32)
    			-- Make `value' the new minimum_width of `Current'.
    			-- There is no need to grow `Current' if its size is
    			-- too small, the parent will do it if necessary.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_WIDGET_I
    			a_minimum_width_positive: value >= 0
    		ensure -- from EV_WIDGET_I
    			minimum_width_assigned: is_usable implies interface.minimum_width = value

    	set_size (w, h: INTEGER_32)
    			-- Resize `Current'.
    			-- (from EV_SIZEABLE_IMP)

    	set_width (value: INTEGER_32)
    			-- Make `value' the new width of `Current'.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from WEL_WINDOW
    			exists: exists

    feature -- Conversion

    	key_code_from_wel (a_wel_code: INTEGER_32): INTEGER_32
    			-- Corresponding key code for ``a_wel_code''.
    			-- (from EV_WEL_KEY_CONVERSION)
    		require -- from EV_WEL_KEY_CONVERSION
    			a_wel_code_valid: valid_wel_code (a_wel_code)

    	key_code_to_wel (a_key_code: INTEGER_32): INTEGER_32
    			-- Corresponding WEL code for ``a_key_code''.
    			-- (from EV_WEL_KEY_CONVERSION)
    		require -- from EV_WEL_KEY_CONVERSION
    			a_key_code_valid: valid_key_code (a_key_code)

    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

    	arrow_action (direction: BOOLEAN)
    			-- Go to the next widget that takes the focus throughthe arrow
    			-- keys. If `direction' it goes to the next widget otherwise,
    			-- it goes to the previous one.
    			-- (from EV_PRIMITIVE_IMP)

    	bring_to_top
    			-- Bring this window to the top of the Z order.
    			--
    			-- Note:
    			--  * If the window is a top-level window, it is activated.
    			--  * If the window is a child window, the top-level parent window
    			--    associated with the child window is activated.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	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_process_notification (notification_code: INTEGER_32)
    			-- Process a `notification_code' which has not been
    			-- processed by process_notification.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists

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

    	disable_horizontal_scroll_bar
    			-- Disable the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	disable_vertical_scroll_bar
    			-- Disable the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

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

    	enable_horizontal_scroll_bar
    			-- Enable the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	enable_vertical_scroll_bar
    			-- Enable the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	ensure_item_visible (tree_node: EV_TREE_NODE)
    			-- Ensure `tree_item' is visible in `Current'.
    			-- Tree nodes may be expanded to achieve this.

    	general_insert_item (item_imp: EV_TREE_NODE_IMP; par, after: POINTER; an_index: INTEGER_32)
    			-- Add `item_imp' to the tree with `par' as parent.
    			-- if `par' is the default_pointer, the parent is the tree.

    	general_remove_item (item_imp: EV_TREE_NODE_IMP)
    			-- Remove `item_imp' from `Current'.

    	get_children (item_imp: EV_TREE_NODE_IMP): ARRAYED_LIST [EV_TREE_NODE_IMP]
    			-- List of the direct children of `item_imp'.
    			-- If the `item_imp' is Void, it returns the children of the tree.

    	go_to_next_group_item (a_parent: WEL_COMPOSITE_WINDOW; after: BOOLEAN)
    			-- Find the previous or following control with the
    			-- Wm_tabstop style in the current group in `a_parent'
    			-- depending on the value of `after'.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			valid_parent: a_parent /= Void and then a_parent.exists

    	go_to_next_tab_item (a_parent: WEL_COMPOSITE_WINDOW; after: BOOLEAN)
    			-- Find the previous or following control with the
    			-- Wm_tabstop style in `a_parent depending on the
    			-- value of `after'.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			valid_parent: a_parent /= Void and then a_parent.exists

    	hide_cursor
    			-- Hide the cursor.
    			-- (from WEL_WINDOWS_ROUTINES)

    	hide_horizontal_scroll_bar
    			-- Hide the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	hide_scroll_bars
    			-- Hide the horizontal and vertical scroll bars.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	hide_vertical_scroll_bar
    			-- Hide the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	insert_after (a_window: WEL_WINDOW)
    			-- Insert the current window after `a_window'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			a_window_not_void: a_window /= Void
    			a_window_not_current: a_window /= Current
    			a_window_exists: a_window.exists

    	internal_general_remove_item (item_imp: EV_TREE_NODE_IMP; depth: INTEGER_32)
    			-- Remove `item_imp' from `Current'.
    			-- This should only be called by `internal_remove_item'.
    			-- We need to track `depth' so that we only assign `False'
    			-- to removing_item when we return from the top level of the recursion.

    	invalidate
    			-- Invalide the entire client area of the window. The
    			-- background will be erased before.
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	invalidate_rect (rect: WEL_RECT; erase_background: BOOLEAN)
    			-- Invalidate the area `rect' and erase
    			-- the background if `erase_background' is True.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			rect_not_void: rect /= Void

    	invalidate_region (region: WEL_REGION; erase_background: BOOLEAN)
    			-- Invalidate the area `region' and erase
    			-- the background if `erase_background' is True.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			region_not_void: region /= Void
    			region_exists: region.exists

    	invalidate_without_background
    			-- Invalidate the entire client area of the window. The
    			-- background will not be erased.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	kill_timer (timer_id: INTEGER_32)
    			-- Kill the timer identified by `timer_id'.
    			-- See also set_timer, on_timer.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			positive_timer_id: timer_id > 0

    	message_beep_asterisk
    			-- Play the system asterisk waveform sound.
    			-- (from WEL_WINDOWS_ROUTINES)

    	message_beep_exclamation
    			-- Play the system exclamation waveform sound.
    			-- (from WEL_WINDOWS_ROUTINES)

    	message_beep_hand
    			-- Play the system hand waveform sound.
    			-- (from WEL_WINDOWS_ROUTINES)

    	message_beep_ok
    			-- Play the system ok waveform sound.
    			-- (from WEL_WINDOWS_ROUTINES)

    	message_beep_question
    			-- Play the system question waveform sound.
    			-- (from WEL_WINDOWS_ROUTINES)

    	wel_move (a_x, a_y: INTEGER_32)
    			-- Move the window to `a_x', `a_y'.
    			-- (from WEL_WINDOW)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	wel_move_and_resize (a_x, a_y, a_width, a_height: INTEGER_32; repaint: BOOLEAN)
    			-- Move the window to `a_x', `a_y' position and
    			-- resize it with `a_width', `a_height'.
    			-- (from WEL_WINDOW)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	on_getdlgcode
    			-- Called when window receives WM_GETDLGCODE message.
    			-- (from EV_PRIMITIVE_IMP)
    		require -- from  WEL_WINDOW
    			True

    	output_debug_string (s: STRING_GENERAL)
    			-- Send a string `s' to the system debugger.
    			-- (from WEL_WINDOWS_ROUTINES)
    		require -- from WEL_WINDOWS_ROUTINES
    			s_not_void: s /= Void

    	process_tab_and_arrows_keys (virtual_key: INTEGER_32)
    			-- Process a tab or arrow key press to give the focus to the next
    			-- widget. Need to be called in the feature on_key_down when the
    			-- control need to process this kind of keys.
    			-- (from EV_PRIMITIVE_IMP)

    	process_tab_key (virtual_key: INTEGER_32)
    			-- Process a tab or arrow key press to give the focus to the next
    			-- widget. Need to be called in the feature on_key_down when the
    			-- control needs to process this kind of keys.
    			-- (from EV_PRIMITIVE_IMP)

    	put_command (a_command: WEL_COMMAND; message: INTEGER_32; argument: ANY)
    			-- Put `a_command' associated to `message'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			a_command_not_void: a_command /= Void
    			positive_message: message >= 0
    		ensure -- from WEL_WINDOW
    			command_added: command (message) = a_command and command_argument (message) = argument

    	remove_command (message: INTEGER_32)
    			-- Remove the command associated to `message'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0
    			command_exists: command_exists (message)
    		ensure -- from WEL_WINDOW
    			command_removed: not command_exists (message)

    	wel_resize (a_width, a_height: INTEGER_32)
    			-- Resize the window with `a_width', `a_height'.
    			-- (from WEL_WINDOW)
    		require -- from  EV_SIZEABLE_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	resource_string_id (an_id: INTEGER_32): STRING_32
    			-- String identified by `an_id' in the resource file.
    			-- (from WEL_WINDOWS_ROUTINES)
    		ensure -- from WEL_WINDOWS_ROUTINES
    			result_not_void: Result /= Void

    	scroll (a_x, a_y: INTEGER_32)
    			-- Scroll the contents of the window's client area.
    			-- `a_x' and `a_y' specify the amount of horizontal
    			-- and vertical scrolling.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_class_icon (new_icon: WEL_ICON)
    			-- Replace the current icon for the class which this window
    			-- belongs to.
    			--
    			-- The SetClassLong function replaces the specified 32-bit (long)
    			-- value at the specified offset into the extra class memory
    			-- or the WNDCLASSEX structure for the class to which the
    			-- specified window belongs.
    			-- (from WEL_WINDOW)

    	set_class_small_icon (new_icon: WEL_ICON)
    			-- Replace the current icon for the class which this window
    			-- belongs to.
    			--
    			-- The SetClassLong function replaces the specified 32-bit (long)
    			-- value at the specified offset into the extra class memory
    			-- or the WNDCLASSEX structure for the class to which the
    			-- specified window belongs.
    			-- (from WEL_WINDOW)

    	set_cursor_position_absolute (x, y: INTEGER_32)
    			-- Set the cursor position to `x', `y'.
    			-- (from WEL_WINDOWS_ROUTINES)

    	set_z_order (z_order: POINTER)
    			-- Set the z-order of the window.
    			-- See class WEL_HWND_CONSTANTS for `z_order' values.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			valid_hwnd_constant: valid_hwnd_constant (z_order)

    	show_cursor
    			-- Show the cursor.
    			-- (from WEL_WINDOWS_ROUTINES)

    	show_horizontal_scroll_bar
    			-- Show the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_scroll_bars
    			-- Show the horizontal and vertical scroll bars.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_vertical_scroll_bar
    			-- Show the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_with_option (cmd_show: INTEGER_32)
    			-- Set the window's visibility with `cmd_show'.
    			-- See class WEL_SW_CONSTANTS for `cmd_show' value.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			parent_shown: wel_parent /= Void implies wel_parent.exists and wel_parent.shown

    	tab_action (direction: BOOLEAN)
    			-- Go to the next widget that takes the focus through to the tab
    			-- key. If `direction' it goes to the next widget otherwise,
    			-- it goes to the previous one.
    			-- (from EV_PRIMITIVE_IMP)

    	tooltip_window: WEL_WINDOW
    			-- `Result' is WEL_WINDOW of `Current' used
    			-- to trigger tooltip events. May be redefined in
    			-- descendents that are composed of more than one window
    			-- such as combo boxes.
    			-- (from EV_PRIMITIVE_IMP)

    	update
    			-- Update the client area by sending a Wm_paint message.
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True
    		require -- from WEL_WINDOW
    			exists: exists

    	validate
    			-- Validate the entire client area of the window.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	validate_rect (rect: WEL_RECT)
    			-- Validate the area `rect'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			rect_not_void: rect /= Void

    	validate_region (region: WEL_REGION)
    			-- Validate the area `region'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			region_not_void: region /= Void
    			region_exists: region.exists

    	win_help (help_file: STRING_GENERAL; a_command, data: INTEGER_32)
    			-- Start the Windows Help program with `help_file'.
    			-- `a_command' specifies the type of help requested. See
    			-- class WEL_HELP_CONSTANTS for `a_command' values.
    			-- 'data' is depandant on 'a_command'.  Check MSDN for more details.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			help_file_not_void: help_file /= Void

    feature -- Obsolete

    	nc_minheight: INTEGER_32 is 2
    			-- Used only in the `notify_change' feature to
    			-- notify the parent that the minimum height of
    			-- `Current' has changed.
    			-- (from EV_SIZEABLE_IMP)

    	nc_minsize: INTEGER_32 is 3
    			-- Used only in the `notify_change' feature to
    			-- notify the parent that both the minimum width
    			-- and height of `Current' widget have changed.
    			-- (from EV_SIZEABLE_IMP)

    	nc_minwidth: INTEGER_32 is 1
    			-- Used only in the `notify_change' feature to
    			-- notify the parent that the minimum width of
    			-- `Current' has changed.
    			-- (from EV_SIZEABLE_IMP)

    feature -- Inapplicable

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

    feature -- Implementation

    	escape_pnd
    			-- Escape the pick and drop.
    			-- (from EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True
    		ensure -- from EV_PICK_AND_DROPABLE_IMP
    			not_in_transport: not transport_executing

    	internal_disable_dockable
    			-- Enable or disable dockable.
    			-- This has no implementation on Windows, as we do not need it.
    			-- On Gtk, this is necessary, so that the necessary signal
    			-- connections may be performed.
    			-- Was declared in EV_DOCKABLE_SOURCE_IMP as synonym of internal_enable_dockable.
    			-- (from EV_DOCKABLE_SOURCE_IMP)
    		require -- from  EV_DOCKABLE_SOURCE_I
    			True

    	internal_enable_dockable
    			-- Enable or disable dockable.
    			-- This has no implementation on Windows, as we do not need it.
    			-- On Gtk, this is necessary, so that the necessary signal
    			-- connections may be performed.
    			-- Was declared in EV_DOCKABLE_SOURCE_IMP as synonym of internal_disable_dockable.
    			-- (from EV_DOCKABLE_SOURCE_IMP)
    		require -- from  EV_DOCKABLE_SOURCE_I
    			True

    	pnd_press (a_x, a_y, a_button, a_screen_x, a_screen_y: INTEGER_32)
    			-- (from EV_PICK_AND_DROPABLE_ITEM_HOLDER_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_IMP
    			True

    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)
    		require -- from  EV_SHARED_TRANSPORT_IMP
    			True

    	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 -- Basic Operations

    	refresh_now
    			-- Refresh now.
    			-- (from EV_WIDGET_IMP)
    		require -- from  EV_WIDGET_I
    			True

    feature -- Basic operation

    	internal_set_minimum_height (value: INTEGER_32)
    			-- Make `value' the new minimum_height of `Current'.
    			-- Should check if the user didn't set the minimum width
    			-- before to set the new value.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_SIZEABLE_IMP
    			positive_value: value >= 0

    	internal_set_minimum_size (mw, mh: INTEGER_32)
    			-- Make `mw' the new minimum_width and `mh' the new
    			-- minimum_height of `Current'.
    			-- Should check if the user didn't set the minimum width
    			-- before to set the new value.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_SIZEABLE_IMP
    			positive_mw: mw >= 0
    			positive_mh: mh >= 0

    	internal_set_minimum_width (value: INTEGER_32)
    			-- Make `value' the new minimum_width of `Current'.
    			-- Should check if the user didn't set the minimum width
    			-- before to set the new value.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_SIZEABLE_IMP
    			positive_value: value >= 0

    	internal_set_size (mw, mh: INTEGER_32)
    			-- Set `size' of child_cell.
    			-- (from EV_SIZEABLE_IMP)
    		require -- from EV_SIZEABLE_IMP
    			positive_mw: mw >= 0
    			positive_mh: mh >= 0

    	parent_ask_resize (a_width, a_height: INTEGER_32)
    			-- Called by the parent when the size of `Current' has to be
    			-- changed to `a_width', `a_height'.
    			-- (from EV_SIZEABLE_IMP)

    	set_move_and_size (a_x_position, a_y_position, a_width, a_height: INTEGER_32)
    			-- Move and resize the widget. Only the parent can call this feature
    			-- because it doesn't notify the parent of the change.
    			-- Equivalent of parent_ask_resize with move.
    			-- (from EV_SIZEABLE_IMP)

    feature -- Constants

    	key_0: INTEGER_32 is 1
    			-- (from EV_KEY_CONSTANTS)

    	key_1: INTEGER_32 is 2
    			-- (from EV_KEY_CONSTANTS)

    	key_2: INTEGER_32 is 3
    			-- (from EV_KEY_CONSTANTS)

    	key_3: INTEGER_32 is 4
    			-- (from EV_KEY_CONSTANTS)

    	key_4: INTEGER_32 is 5
    			-- (from EV_KEY_CONSTANTS)

    	key_5: INTEGER_32 is 6
    			-- (from EV_KEY_CONSTANTS)

    	key_6: INTEGER_32 is 7
    			-- (from EV_KEY_CONSTANTS)

    	key_7: INTEGER_32 is 8
    			-- (from EV_KEY_CONSTANTS)

    	key_8: INTEGER_32 is 9
    			-- (from EV_KEY_CONSTANTS)

    	key_9: INTEGER_32 is 10
    			-- (from EV_KEY_CONSTANTS)

    	key_a: INTEGER_32 is 68
    			-- (from EV_KEY_CONSTANTS)

    	key_alt: INTEGER_32 is 96
    			-- (from EV_KEY_CONSTANTS)

    	key_b: INTEGER_32 is 69
    			-- (from EV_KEY_CONSTANTS)

    	key_back_space: INTEGER_32 is 40
    			-- (from EV_KEY_CONSTANTS)

    	key_backquote: INTEGER_32 is 56
    			-- (from EV_KEY_CONSTANTS)

    	key_backslash: INTEGER_32 is 54
    			-- (from EV_KEY_CONSTANTS)

    	key_c: INTEGER_32 is 70
    			-- (from EV_KEY_CONSTANTS)

    	key_caps_lock: INTEGER_32 is 45
    			-- (from EV_KEY_CONSTANTS)

    	key_close_bracket: INTEGER_32 is 52
    			-- (from EV_KEY_CONSTANTS)

    	key_comma: INTEGER_32 is 47
    			-- (from EV_KEY_CONSTANTS)

    	key_ctrl: INTEGER_32 is 95
    			-- (from EV_KEY_CONSTANTS)

    	key_d: INTEGER_32 is 71
    			-- (from EV_KEY_CONSTANTS)

    	key_dash: INTEGER_32 is 57
    			-- (from EV_KEY_CONSTANTS)

    	key_delete: INTEGER_32 is 67
    			-- (from EV_KEY_CONSTANTS)

    	key_down_arrow: INTEGER_32 is 59
    			-- (from EV_KEY_CONSTANTS)

    	key_e: INTEGER_32 is 72
    			-- (from EV_KEY_CONSTANTS)

    	key_end: INTEGER_32 is 65
    			-- (from EV_KEY_CONSTANTS)

    	key_enter: INTEGER_32 is 41
    			-- (from EV_KEY_CONSTANTS)

    	key_equal: INTEGER_32 is 48
    			-- (from EV_KEY_CONSTANTS)

    	key_escape: INTEGER_32 is 42
    			-- (from EV_KEY_CONSTANTS)

    	key_f: INTEGER_32 is 73
    			-- (from EV_KEY_CONSTANTS)

    	key_f1: INTEGER_32 is 27
    			-- (from EV_KEY_CONSTANTS)

    	key_f10: INTEGER_32 is 36
    			-- (from EV_KEY_CONSTANTS)

    	key_f11: INTEGER_32 is 37
    			-- (from EV_KEY_CONSTANTS)

    	key_f12: INTEGER_32 is 38
    			-- (from EV_KEY_CONSTANTS)

    	key_f2: INTEGER_32 is 28
    			-- (from EV_KEY_CONSTANTS)

    	key_f3: INTEGER_32 is 29
    			-- (from EV_KEY_CONSTANTS)

    	key_f4: INTEGER_32 is 30
    			-- (from EV_KEY_CONSTANTS)

    	key_f5: INTEGER_32 is 31
    			-- (from EV_KEY_CONSTANTS)

    	key_f6: INTEGER_32 is 32
    			-- (from EV_KEY_CONSTANTS)

    	key_f7: INTEGER_32 is 33
    			-- (from EV_KEY_CONSTANTS)

    	key_f8: INTEGER_32 is 34
    			-- (from EV_KEY_CONSTANTS)

    	key_f9: INTEGER_32 is 35
    			-- (from EV_KEY_CONSTANTS)

    	key_g: INTEGER_32 is 74
    			-- (from EV_KEY_CONSTANTS)

    	key_h: INTEGER_32 is 75
    			-- (from EV_KEY_CONSTANTS)

    	key_home: INTEGER_32 is 64
    			-- (from EV_KEY_CONSTANTS)

    	key_i: INTEGER_32 is 76
    			-- (from EV_KEY_CONSTANTS)

    	key_insert: INTEGER_32 is 66
    			-- (from EV_KEY_CONSTANTS)

    	key_j: INTEGER_32 is 77
    			-- (from EV_KEY_CONSTANTS)

    	key_k: INTEGER_32 is 78
    			-- (from EV_KEY_CONSTANTS)

    	key_l: INTEGER_32 is 79
    			-- (from EV_KEY_CONSTANTS)

    	key_left: INTEGER_32 is 60
    			-- (from EV_KEY_CONSTANTS)

    	key_left_meta: INTEGER_32 is 97
    			-- (from EV_KEY_CONSTANTS)

    	key_m: INTEGER_32 is 80
    			-- (from EV_KEY_CONSTANTS)

    	key_menu: INTEGER_32 is 99
    			-- (from EV_KEY_CONSTANTS)

    	key_n: INTEGER_32 is 81
    			-- (from EV_KEY_CONSTANTS)

    	key_num_lock: INTEGER_32 is 24
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_0: INTEGER_32 is 11
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_1: INTEGER_32 is 12
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_2: INTEGER_32 is 13
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_3: INTEGER_32 is 14
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_4: INTEGER_32 is 15
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_5: INTEGER_32 is 16
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_6: INTEGER_32 is 17
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_7: INTEGER_32 is 18
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_8: INTEGER_32 is 19
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_9: INTEGER_32 is 20
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_add: INTEGER_32 is 21
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_decimal: INTEGER_32 is 26
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_divide: INTEGER_32 is 22
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_multiply: INTEGER_32 is 23
    			-- (from EV_KEY_CONSTANTS)

    	key_numpad_subtract: INTEGER_32 is 25
    			-- (from EV_KEY_CONSTANTS)

    	key_o: INTEGER_32 is 82
    			-- (from EV_KEY_CONSTANTS)

    	key_open_bracket: INTEGER_32 is 51
    			-- (from EV_KEY_CONSTANTS)

    	key_p: INTEGER_32 is 83
    			-- (from EV_KEY_CONSTANTS)

    	key_page_down: INTEGER_32 is 63
    			-- (from EV_KEY_CONSTANTS)

    	key_page_up: INTEGER_32 is 62
    			-- (from EV_KEY_CONSTANTS)

    	key_pause: INTEGER_32 is 44
    			-- (from EV_KEY_CONSTANTS)

    	key_period: INTEGER_32 is 49
    			-- (from EV_KEY_CONSTANTS)

    	key_q: INTEGER_32 is 84
    			-- (from EV_KEY_CONSTANTS)

    	key_quote: INTEGER_32 is 55
    			-- (from EV_KEY_CONSTANTS)

    	key_r: INTEGER_32 is 85
    			-- (from EV_KEY_CONSTANTS)

    	key_right: INTEGER_32 is 61
    			-- (from EV_KEY_CONSTANTS)

    	key_right_meta: INTEGER_32 is 98
    			-- (from EV_KEY_CONSTANTS)

    	key_s: INTEGER_32 is 86
    			-- (from EV_KEY_CONSTANTS)

    	key_scroll_lock: INTEGER_32 is 46
    			-- (from EV_KEY_CONSTANTS)

    	key_semicolon: INTEGER_32 is 50
    			-- (from EV_KEY_CONSTANTS)

    	key_shift: INTEGER_32 is 94
    			-- (from EV_KEY_CONSTANTS)

    	key_slash: INTEGER_32 is 53
    			-- (from EV_KEY_CONSTANTS)

    	key_space: INTEGER_32 is 39
    			-- (from EV_KEY_CONSTANTS)

    	key_t: INTEGER_32 is 87
    			-- (from EV_KEY_CONSTANTS)

    	key_tab: INTEGER_32 is 43
    			-- (from EV_KEY_CONSTANTS)

    	key_u: INTEGER_32 is 88
    			-- (from EV_KEY_CONSTANTS)

    	key_up_arrow: INTEGER_32 is 58
    			-- (from EV_KEY_CONSTANTS)

    	key_v: INTEGER_32 is 89
    			-- (from EV_KEY_CONSTANTS)

    	key_w: INTEGER_32 is 90
    			-- (from EV_KEY_CONSTANTS)

    	key_x: INTEGER_32 is 91
    			-- (from EV_KEY_CONSTANTS)

    	key_y: INTEGER_32 is 92
    			-- (from EV_KEY_CONSTANTS)

    	key_z: INTEGER_32 is 93
    			-- (from EV_KEY_CONSTANTS)

    feature -- Contract support

    	valid_key_code (a_code: INTEGER_32): BOOLEAN
    			-- Is ``a_code'' a valid key code?
    			-- (from EV_KEY_CONSTANTS)

    	valid_wel_code (a_wel_code: INTEGER_32): BOOLEAN
    			-- Is ``a_wel_code'' valid?
    			-- (from EV_WEL_KEY_CONVERSION)

    feature -- Deferred features

    	has_tabstop: BOOLEAN
    			-- Does `Current' exhibit all attributes to permit it to receive the
    			-- focus while tabbing?
    			-- (from EV_WIDGET_IMP)

    	next_dlggroupitem (hdlg, hctl: POINTER; previous: BOOLEAN): POINTER
    			-- Encapsulation of the SDK GetNextDlgGroupItem,
    			-- because we cannot do a deferred feature become an
    			-- external feature.
    			-- (from EV_WIDGET_IMP)

    	next_dlgtabitem (hdlg, hctl: POINTER; previous: BOOLEAN): POINTER
    			-- Encapsulation of the SDK GetNextDlgTabItem,
    			-- because we cannot do a deferred feature become an
    			-- external feature.
    			-- (from EV_WIDGET_IMP)

    	next_tabstop_widget (start_widget: EV_WIDGET; search_pos: INTEGER_32; forwards: BOOLEAN): EV_WIDGET_IMP
    			-- Return the next widget that may by tabbed to as a result of pressing the tab key from `start_widget'.
    			-- `search_pos' is the index where searching must start from for containers, and `forwards' determines the
    			-- tabbing direction. If `search_pos' is less then 1 or more than count for containers, the parent of the
    			-- container must be searched next.
    			-- (from EV_WIDGET_IMP)
    		require -- from EV_WIDGET_IMP
    			start_widget_not_void: start_widget /= Void
    		ensure -- from EV_WIDGET_IMP
    			result_not_void: Result /= Void

    	next_tabstop_widget_from_parent (start_widget: EV_WIDGET; search_pos: INTEGER_32; forwards: BOOLEAN): EV_WIDGET_IMP
    			-- Return the next widget that may be tabbed to as a result of pressing the tab key from `start_widget'
    			-- by visiting the parent of `Current' with a search index determined by `search_pos' and `forwards'.
    			-- (from EV_WIDGET_IMP)
    		require -- from EV_WIDGET_IMP
    			start_widget_not_void: start_widget /= Void
    		ensure -- from EV_WIDGET_IMP
    			result_not_void: Result /= Void

    	on_size (size_type, a_width, a_height: INTEGER_32)
    			-- `Current' has been resized.
    			-- (from EV_WIDGET_IMP)
    		require -- from WEL_WINDOW
    			exists: exists

    	return_current_if_next_tabstop_widget (start_widget: EV_WIDGET; search_pos: INTEGER_32; forwards: BOOLEAN): EV_WIDGET_IMP
    			-- If `Current' is not equal to `start_widget' then return `Current' but only if `search_pos' is 1 and `forwards' or
    			-- `search_pos' is 0 and not `forwards. This ensures that we return a container in the correct order (before or after)
    			-- its children dependent on the state of `forwards'.
    			-- (from EV_WIDGET_IMP)
    		require -- from EV_WIDGET_IMP
    			start_widget_not_void: start_widget /= Void

    	start_widget_searched_cell: CELL [INTEGER_32]
    			-- A cell to hold the seach index that the item tabbed from started with.
    			-- This is necessary to prevent infinite recursion in the
    			-- case where there is no next item as if we return to the
    			-- original widget with the same search position, then we know we have exhausted all other possibilities.
    			-- (from EV_WIDGET_IMP)

    	wel_background_color: WEL_COLOR_REF
    			-- `Result' is background color of `Current'.
    			-- (from EV_WIDGET_IMP)

    	wel_foreground_color: WEL_COLOR_REF
    			-- `Result' is foreground color of `Current'.
    			-- (from EV_WIDGET_IMP)

    feature -- Element Change

    	set_default_processing (value: BOOLEAN)
    			-- Enable or disable default processing of window messages.
    			-- (from WEL_RETURN_VALUE)
    		ensure -- from WEL_RETURN_VALUE
    			value_set: default_processing = value

    	set_message_return_value (value: POINTER)
    			-- Set the window-procedure-return-value.
    			-- (from WEL_RETURN_VALUE)
    		require -- from  EV_WIDGET_IMP
    			True
    		ensure -- from WEL_RETURN_VALUE
    			has_return_value: has_return_value
    			value_set: message_return_value = value

    feature -- Event handling

    	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

    	create_conforming_pick_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a conforming_pick action sequence.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			True

    	create_deselect_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a deselect action sequence.
    			-- (from EV_TREE_ACTION_SEQUENCES_IMP)
    		require -- from  EV_TREE_ACTION_SEQUENCES_I
    			True

    	create_focus_in_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a focus_in action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_focus_out_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a focus_out action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_key_press_actions: EV_KEY_ACTION_SEQUENCE
    			-- Create a key_press action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_key_press_string_actions: EV_KEY_STRING_ACTION_SEQUENCE
    			-- Create a key_press_string action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_key_release_actions: EV_KEY_ACTION_SEQUENCE
    			-- Create a key_release action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_mouse_wheel_actions: EV_INTEGER_ACTION_SEQUENCE
    			-- Create a mouse_wheel action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_pick_actions: EV_PND_START_ACTION_SEQUENCE
    			-- Create a pick action sequence.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			True

    	create_pick_ended_actions: EV_PND_FINISHED_ACTION_SEQUENCE
    			-- Create a pick ended action sequence.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_IMP)
    		require -- from  EV_PICK_AND_DROPABLE_ACTION_SEQUENCES_I
    			True

    	create_pointer_button_press_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE
    			-- Create a pointer_button_press action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_pointer_button_release_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE
    			-- Create a pointer_button_release action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_pointer_double_press_actions: EV_POINTER_BUTTON_ACTION_SEQUENCE
    			-- Create a pointer_double_press action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_pointer_enter_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a pointer_enter action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_pointer_leave_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a pointer_leave action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_pointer_motion_actions: EV_POINTER_MOTION_ACTION_SEQUENCE
    			-- Create a pointer_motion action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_resize_actions: EV_GEOMETRY_ACTION_SEQUENCE
    			-- Create a resize action sequence.
    			-- (from EV_WIDGET_ACTION_SEQUENCES_IMP)
    		require -- from  EV_WIDGET_ACTION_SEQUENCES_I
    			True

    	create_select_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Create a select action sequence.
    			-- (from EV_TREE_ACTION_SEQUENCES_IMP)
    		require -- from  EV_TREE_ACTION_SEQUENCES_I
    			True

    	deselect_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when a tree item is deselected.
    			-- (from EV_TREE_ACTION_SEQUENCES_I)
    		ensure -- from EV_TREE_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

    	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

    	new_item_actions: ACTION_SEQUENCE [TUPLE [EV_ITEM]]
    			-- Actions to be performed after an item is added.
    			-- (from EV_ITEM_LIST_IMP)

    	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

    	remove_item_actions: ACTION_SEQUENCE [TUPLE [EV_ITEM]]
    			-- Actions to be performed before an item is removed.
    			-- (from EV_ITEM_LIST_IMP)

    	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

    	select_actions: EV_NOTIFY_ACTION_SEQUENCE
    			-- Actions to be performed when a tree item is selected.
    			-- (from EV_TREE_ACTION_SEQUENCES_I)
    		ensure -- from EV_TREE_ACTION_SEQUENCES_I
    			not_void: Result /= Void

    feature -- Externals

    	cwin_get_next_dlggroupitem (hdlg, hctl: POINTER; previous: BOOLEAN): POINTER
    			-- SDK GetNextDlgGroupItem
    			-- (from WEL_CONTROL)
    		require -- from  EV_WIDGET_IMP
    			True

    	cwin_get_next_dlgtabitem (hdlg, hctl: POINTER; previous: BOOLEAN): POINTER
    			-- SDK GetNextDlgGroupItem
    			-- (from WEL_CONTROL)
    		require -- from  EV_WIDGET_IMP
    			True

    	cwin_show_window (hwnd: POINTER; cmd_show: INTEGER_32)
    			-- SDK ShowWindow
    			-- (from WEL_WINDOW)
    		require -- from  EV_WIDGET_IMP
    			True

    feature -- Feature that should be directly implemented by externals

    	show_window (hwnd: POINTER; cmd_show: INTEGER_32)
    			-- Encapsulation of the cwin_show_window function of
    			-- WEL_WINDOW. Normaly, we should be able to have directly
    			-- cwin_show_window deferred but it does not wotk because
    			-- it would be implemented by an external.
    			-- (from EV_WIDGET_IMP)

    feature -- Notifications

    	on_tvn_begindrag (info: WEL_NM_TREE_VIEW)
    			-- A drag-and-drop operation involving the left mouse
    			-- button is being initiated.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_beginlabeledit (info: WEL_TREE_VIEW_ITEM)
    			-- A label editing for an item has started.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_beginrdrag (info: WEL_NM_TREE_VIEW)
    			-- A drag-and-drop operation involving the right mouse
    			-- button is being initiated.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_deleteitem (info: WEL_NM_TREE_VIEW)
    			-- An item has been deleted.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_endlabeledit (info: WEL_TREE_VIEW_ITEM)
    			-- A label editing for an item has ended.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_getdispinfo (info: WEL_TREE_VIEW_ITEM)
    			-- The parent window must provide information needed
    			-- to display or sort an item.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_itemexpanding (info: WEL_NM_TREE_VIEW)
    			-- a parent item's list of child items is about to
    			-- expand or collapse.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_keydown (virtual_key: INTEGER_32)
    			-- The user pressed a key and the tree-view control
    			-- has the input focus.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    	on_tvn_setdispinfo (info: WEL_TREE_VIEW_ITEM)
    			-- The parent window must update the informations
    			-- it maintains about an item.
    			-- (from WEL_TREE_VIEW)
    		require -- from WEL_TREE_VIEW
    			exists: exists

    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 -- Position

    	set_position (new_x_position: INTEGER_32; new_y_position: INTEGER_32)
    			-- Put at horizontal position `new_x_position' and at
    			-- vertical position `new_y_position' relative to parent.
    			-- (from EV_SIZEABLE_IMP)

    feature -- Registration

    	is_registered: BOOLEAN
    			-- Is `window' registered?
    			-- (from WEL_WINDOW)

    	frozen register_current_window
    			-- Register `Current' in window manager.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			registered: is_registered

    feature -- Tooltip Flag constants

    	ttf_centertip: INTEGER_32 is 2
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttf_idishwnd: INTEGER_32 is 1
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttf_rtlreading: INTEGER_32 is 4
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttf_subclass: INTEGER_32 is 16
    			-- (from WEL_TOOLTIP_CONSTANTS)

    feature -- Tooltip message constants

    	ttm_activate: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_addtool: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_deltool: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_enumtools: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_getcurrenttool: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_getdelaytime: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_getmaxtipwidth: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_gettext: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_gettipbkcolor: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_gettiptextcolor: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_gettoolcount: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_gettoolinfo: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_hittest: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_newtoolrect: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_relayevent: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_setdelaytime: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_setmaxtipwidth: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_settipbkcolor: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_settiptextcolor: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_settoolinfo: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_updatetiptext: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttm_windowfrompoint: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    feature -- Tooltip style constants

    	tts_alwaystip: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	tts_noprefix: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    feature -- Tooltip time delay constants

    	ttdt_automatic: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttdt_autopop: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttdt_initial: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    	ttdt_reshow: INTEGER_32
    			-- (from WEL_TOOLTIP_CONSTANTS)

    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

    		-- from EV_DYNAMIC_LIST_I
    	index_within_bounds: is_usable implies (index >= 0 and then index <= count + 1)

    		-- from EV_ITEM_LIST_IMP
    	new_item_actions_not_void: is_usable implies new_item_actions /= Void
    	remove_item_actions_not_void: is_usable implies remove_item_actions /= Void

    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_TREE_IMP