indexing
	description: "[
				A control in which the user can enter and edit rich text.
		
				Note: Rich edit DLL needs to be loaded. See class WEL_RICH_EDIT_DLL.
					All paragraph measurements are in twips. A twip is 1/1440 of
					an inch or 1/20 of a point.
	]"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2007-07-10 17:31:52 -0700 (Tue, 10 Jul 2007) $"
	revision: "$Revision: 69379 $"

class interface
	WEL_RICH_EDIT


create 
	make (a_parent: WEL_WINDOW; a_name: STRING_GENERAL; a_x, a_y, a_width, a_height, an_id: INTEGER_32)
			-- Make a rich edit control.
		require
			a_parent_not_void: a_parent /= Void
			a_parent_exists: a_parent.exists
			a_name_not_void: a_name /= Void
		ensure
			parent_set: parent = a_parent
			exists: exists
			name_set: text.is_equal (a_name)
			id_set: id = an_id

	make_by_id (a_parent: WEL_DIALOG; an_id: INTEGER_32)
			-- Make a control identified by `an_id' with `a_parent'
			-- as parent.
			-- (from WEL_CONTROL)
		require -- from WEL_CONTROL
			a_parent_not_void: a_parent /= Void
			positive_id: an_id > 0
		ensure -- from WEL_CONTROL
			parent_set: parent = a_parent
			id_set: id = an_id

feature -- Access

	background_color: WEL_COLOR_REF
			-- Background color used for the background of the
			-- control
			-- Can be redefined by the user
			-- (from WEL_EDIT)
		require -- from WEL_COLOR_CONTROL
			exists: exists
		ensure -- from WEL_COLOR_CONTROL
			background_color_not_void: Result /= Void

	color_3ddkshadow: INTEGER_32 is 21
			-- Dark shadow for three-dimensional display elements.
			--
			-- Declared in Windows as COLOR_3DDKSHADOW
			-- (from WEL_COLOR_CONSTANTS)

	color_3dface: INTEGER_32 is 15
			-- Face color for three-dimensional display elements and
			-- for dialog box backgrounds.
			--
			-- Declared in Windows as COLOR_3DFACE
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_btnface.
			-- (from WEL_COLOR_CONSTANTS)

	color_3dhighlight: INTEGER_32 is 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_3dhilight, Color_btnhilight and Color_btnhighlight.
			-- (from WEL_COLOR_CONSTANTS)

	color_3dhilight: INTEGER_32 is 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_3dhighlight, Color_btnhilight and Color_btnhighlight.
			-- (from WEL_COLOR_CONSTANTS)

	color_3dlight: INTEGER_32 is 22
			-- Light color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DLIGHT
			-- (from WEL_COLOR_CONSTANTS)

	color_3dshadow: INTEGER_32 is 16
			-- Shadow color for three-dimensional display elements
			-- (for edges facing away from the light source).
			--
			-- Declared in Windows as COLOR_3DSHADOW
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_btnshadow.
			-- (from WEL_COLOR_CONSTANTS)

	color_activeborder: INTEGER_32 is 10
			-- Active window border.
			--
			-- Declared in Windows as COLOR_ACTIVEBORDER
			-- (from WEL_COLOR_CONSTANTS)

	color_activecaption: INTEGER_32 is 2
			-- Active window title bar. 
			--
			-- Windows 98/Me, Windows 2000 or later:
			--   Specifies the left side color in the color gradient of an active
			--   window's title bar if the gradient effect is enabled.
			--
			-- Declared in Windows as COLOR_ACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	color_appworkspace: INTEGER_32 is 12
			-- Background color of multiple document interface (MDI) applications.
			--
			-- Declared in Windows as COLOR_APPWORKSPACE
			-- (from WEL_COLOR_CONSTANTS)

	color_background: INTEGER_32 is 1
			-- Desktop.
			--
			-- Declared in Windows as COLOR_BACKGROUND
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_desktop.
			-- (from WEL_COLOR_CONSTANTS)

	color_btnface: INTEGER_32 is 15
			-- Face color for three-dimensional display elements and
			-- for dialog box backgrounds.
			--
			-- Declared in Windows as COLOR_3DFACE
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_3dface.
			-- (from WEL_COLOR_CONSTANTS)

	color_btnhighlight: INTEGER_32 is 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_3dhilight, Color_3dhighlight and Color_btnhilight.
			-- (from WEL_COLOR_CONSTANTS)

	color_btnhilight: INTEGER_32 is 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_3dhilight, Color_3dhighlight and Color_btnhighlight.
			-- (from WEL_COLOR_CONSTANTS)

	color_btnshadow: INTEGER_32 is 16
			-- Shadow color for three-dimensional display elements
			-- (for edges facing away from the light source).
			--
			-- Declared in Windows as COLOR_3DSHADOW
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_3dshadow.
			-- (from WEL_COLOR_CONSTANTS)

	color_btntext: INTEGER_32 is 18
			-- Text on push buttons.
			--
			-- Declared in Windows as COLOR_BTNTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_captiontext: INTEGER_32 is 9
			-- Text in caption, size box, and scroll bar arrow box.
			--
			-- Declared in Windows as COLOR_CAPTIONTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_desktop: INTEGER_32 is 1
			-- Desktop.
			--
			-- Declared in Windows as COLOR_BACKGROUND
			-- Was declared in WEL_COLOR_CONSTANTS as synonym of Color_background.
			-- (from WEL_COLOR_CONSTANTS)

	color_gradientactivecaption: INTEGER_32 is 27
			-- Windows 98/Me, Windows 2000 or later:
			--   Right side color in the color gradient of an active window's
			--   title bar. COLOR_ACTIVECAPTION specifies the left side color.
			--   Use SPI_GETGRADIENTCAPTIONS with the SystemParametersInfo
			--   function to determine whether the gradient effect is enabled.
			--
			-- Declared in Windows as COLOR_GRADIENTACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	color_gradientinactivecaption: INTEGER_32 is 28
			-- Windows 98/Me, Windows 2000 or later:
			--   Right side color in the color gradient of an inactive window's
			--   title bar. COLOR_INACTIVECAPTION specifies the left side color.
			--
			-- Declared in Windows as COLOR_GRADIENTINACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	color_graytext: INTEGER_32 is 17
			-- Grayed (disabled) text. This color is set to 0 if the current
			-- display driver does not support a solid gray color.
			--
			-- Declared in Windows as COLOR_GRAYTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_highlight: INTEGER_32 is 13
			-- Item(s) selected in a control.
			--
			-- Declared in Windows as COLOR_HIGHLIGHT
			-- (from WEL_COLOR_CONSTANTS)

	color_highlighttext: INTEGER_32 is 14
			-- Text of item(s) selected in a control.
			--
			-- Declared in Windows as COLOR_HIGHLIGHTTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_hotlight: INTEGER_32 is 26
			-- Windows 98/Me, Windows 2000 or later:
			--   Color for a hot-tracked item. Single clicking a hot-tracked
			--   item executes the item.
			--
			-- Declared in Windows as COLOR_HOTLIGHT
			-- (from WEL_COLOR_CONSTANTS)

	color_inactiveborder: INTEGER_32 is 11
			-- Inactive window border.
			--
			-- Declared in Windows as COLOR_INACTIVEBORDER
			-- (from WEL_COLOR_CONSTANTS)

	color_inactivecaption: INTEGER_32 is 3
			-- Inactive window caption. 
			--
			-- Windows 98/Me, Windows 2000 or later:
			--   Specifies the left side color in the color gradient of an inactive
			--   window's title bar if the gradient effect is enabled.
			--
			-- Declared in Windows as COLOR_INACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	color_inactivecaptiontext: INTEGER_32 is 19
			-- Color of text in an inactive caption.
			--
			-- Declared in Windows as COLOR_INACTIVECAPTIONTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_infobk: INTEGER_32 is 24
			-- Background color for tooltip controls.
			--
			-- Declared in Windows as COLOR_INFOBK
			-- (from WEL_COLOR_CONSTANTS)

	color_infotext: INTEGER_32 is 23
			-- Text color for tooltip controls.
			--
			-- Declared in Windows as COLOR_INFOTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_menu: INTEGER_32 is 4
			-- Menu background.
			--
			-- Declared in Windows as COLOR_MENU
			-- (from WEL_COLOR_CONSTANTS)

	color_menubar: INTEGER_32 is 30
			-- Windows XP:
			--   The background color for the menu bar when menus appear as 
			--   flat menus (see SystemParametersInfo). However, Color_menu
			--   continues to specify the background color of the menu popup.
			--
			-- Declared in Windows as COLOR_MENUBAR
			-- (from WEL_COLOR_CONSTANTS)

	color_menuhilight: INTEGER_32 is 29
			-- Windows XP:
			--   The color used to highlight menu items when the menu appears
			--   as a flat menu (see SystemParametersInfo). The highlighted
			--   menu item is outlined with COLOR_HIGHLIGHT.
			--
			-- Declared in Windows as COLOR_MENUHILIGHT
			-- (from WEL_COLOR_CONSTANTS)

	color_menutext: INTEGER_32 is 7
			-- Text in menus.
			--
			-- Declared in Windows as COLOR_MENUTEXT
			-- (from WEL_COLOR_CONSTANTS)

	color_scrollbar: INTEGER_32 is 0
			-- Scroll bar gray area.
			--
			-- Declared in Windows as COLOR_SCROLLBAR
			-- (from WEL_COLOR_CONSTANTS)

	color_window: INTEGER_32 is 5
			-- Window background.
			--
			-- Declared in Windows as COLOR_WINDOW
			-- (from WEL_COLOR_CONSTANTS)

	color_windowframe: INTEGER_32 is 6
			-- Window frame.
			--
			-- Declared in Windows as COLOR_WINDOWFRAME
			-- (from WEL_COLOR_CONSTANTS)

	color_windowtext: INTEGER_32 is 8
			-- Text in windows.
			--
			-- Declared in Windows as COLOR_WINDOWTEXT
			-- (from WEL_COLOR_CONSTANTS)

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

	default_processing: BOOLEAN
			-- (from WEL_RETURN_VALUE)

	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: WEL_COLOR_REF
			-- foreground color used for the text of the
			-- control
			-- Can be redefined by the user
			-- (from WEL_STATIC)
		require -- from WEL_COLOR_CONTROL
			exists: exists
		ensure -- from WEL_COLOR_CONTROL
			foreground_color_not_void: Result /= Void

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

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

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

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

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

	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

	parent: WEL_WINDOW
			-- Parent window
			-- (from WEL_WINDOW)
	
feature -- Comparison

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

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

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

	is_equal (other: WEL_RICH_EDIT): 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: WEL_RICH_EDIT): 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 WEL_WINDOW
			exists: exists
		ensure -- from WEL_WINDOW
			Result = window_rect.x

	absolute_y: INTEGER_32
			-- Absolute y position
			-- (from WEL_WINDOW)
		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

	can_undo: BOOLEAN
			-- Can the last operation be undone?
			-- (from WEL_EDIT)
		require -- from WEL_EDIT
			exists: exists

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

	caret_position: INTEGER_32
			-- Caret position
		require -- from WEL_EDIT
			exists: exists

	character_index_from_position (a_x, a_y: INTEGER_32): INTEGER_32
			-- Zero-based character index of the character which is
			-- the nearest to `a_x' and `a_y' position in the client
			-- area.
			-- A returned coordinate can be negative if the
			-- character has been scrolled outside the edit
			-- control's client area. The coordinates are truncated
			-- to integer values and are in screen units relative
			-- to the upper-left corner of the client area of the
			-- control.
		require
			exists: exists
			a_x_large_enough: a_x >= 0
			a_y_large_enough: a_y >= 0

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

	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

	count: INTEGER_32
			-- Length of text.

	current_line_index: INTEGER_32
			-- Index of the line that contains the caret.
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0

	current_line_number: INTEGER_32
			-- Line number of the line that contains the caret.
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0
			result_small_enough: Result < line_count

	current_selection_character_format: WEL_CHARACTER_FORMAT
			-- Current selection character format information
		require
			exists: exists
		ensure
			result_not_void: Result /= Void

	default_character_format: WEL_CHARACTER_FORMAT
			-- Default character format information
		require
			exists: exists
		ensure
			result_not_void: Result /= Void

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

	event_mask: INTEGER_32
			-- Event mask which specifies notification message the
			-- control sends to its parent window.
			-- See class WEL_ENM_CONSTANTS for values.
		require
			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  WEL_COLOR_CONTROL
			True
		ensure -- from WEL_ANY
			Result = (item /= default_pointer)

	first_visible_line: INTEGER_32
			-- Upper most visible line
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0
			result_small_enough: Result < line_count

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

	formatting_rect: WEL_RECT
			-- Limiting rectangle the text. It is independent of
			-- the size of the edit-control window.
			-- (from WEL_EDIT)
		require -- from WEL_EDIT
			exists: exists
		ensure -- from WEL_EDIT
			result_not_void: Result /= Void

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

	has_focus: BOOLEAN
			-- Does this window have the focus?
			-- (from WEL_WINDOW)
		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_selection: BOOLEAN
			-- Has a current selection?
		require -- from WEL_EDIT
			exists: exists

	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)

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

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

	line (i: INTEGER_32): STRING_32
			-- `i'th line
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
			i_large_enough: i >= 0
			i_small_enough: i < line_count
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			result_exists: Result /= Void

	line_count: INTEGER_32
			-- Number of lines
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0

	line_from_char (i: INTEGER_32): INTEGER_32
			-- Index of the line that contains the character
			-- index `i'. A character index is the number of
			-- characters from the beginning of the edit control.
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0

	line_index (i: INTEGER_32): INTEGER_32
			-- Number of characters from the beginning of the edit
			-- control to the zero-based line `i'.
			-- Retrieve a character index for a given line number.
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
			i_large_enough: i >= 0
			i_small_enough: i < line_count
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0

	line_length (i: INTEGER_32): INTEGER_32
			-- Length of the `i'th line
			-- (from WEL_MULTIPLE_LINE_EDIT)
		require -- from WEL_MULTIPLE_LINE_EDIT
			exists: exists
			i_large_enough: i >= 0
			i_small_enough: i < line_count
		ensure -- from WEL_MULTIPLE_LINE_EDIT
			positive_result: Result >= 0
			result_ok: Result = line (i).count

	line_number_from_position (a_pos: INTEGER_32): INTEGER_32
			-- Retrieves the line number from a character position.
			-- Line numbers start at 0.
		require
			exists: exists
			a_pos_large_enough: a_pos >= 0

	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

	modified: BOOLEAN
			-- Has the text been modified?
			-- (from WEL_EDIT)
		require -- from WEL_EDIT
			exists: exists

	options: INTEGER_32
			-- Give the current set of options.

	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

	position_from_character_index (character_index: INTEGER_32): WEL_POINT
			-- Coordinates of a character at `character_index' in
			-- the client area.
			-- A returned coordinate can be negative if the
			-- character has been scrolled outside the edit
			-- control's client area.
			-- The coordinates are truncated to integer values and
			-- are in screen units relative to the upper-left
			-- corner of the client area of the control.
		require
			exists: exists
			index_large_enough: character_index >= 0
			index_small_enough: character_index <=