    indexing
    	description: "Objects that represent an EiffelVision2 header item for EV_GRID_COLUMN."
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-01-31 14:44:41 -0800 (Tue, 31 Jan 2006) $"
    	revision: "$Revision: 56811 $"

    class interface
    	EV_GRID_HEADER_ITEM

    create {EV_GRID_COLUMN_I}
    	make_with_grid_column (a_column: EV_GRID_COLUMN_I)
    			-- Create and associate `Current' with `a_column'
    		require
    			a_column_not_void: a_column /= Void

    feature -- Access

    	accept_cursor: EV_POINTER_STYLE
    			-- `Result' is cursor displayed when the screen pointer is over a
    			-- target that accepts pebble during pick and drop.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from  EV_ABSTRACT_PICK_AND_DROPABLE
    			True
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			result_not_void: Result /= Void
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.accept_cursor

    	column: EV_GRID_COLUMN_I
    			-- Grid column to which `Current' is associated with.

    	data: ANY
    			-- Arbitrary user data may be stored here.
    			-- (from EV_ANY)

    	deny_cursor: EV_POINTER_STYLE
    			-- `Result' is cursor displayed when the screen pointer is over a
    			-- target that does not accept pebble during pick and drop.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from  EV_ABSTRACT_PICK_AND_DROPABLE
    			True
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			result_not_void: Result /= Void
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.deny_cursor

    	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)

    	frozen id_object (an_id: INTEGER_32): IDENTIFIED
    			-- Object associated with `an_id' (void if no such object)
    			-- (from IDENTIFIED)
    		ensure -- from IDENTIFIED
    			consistent: Result = Void or else Result.object_id = an_id

    	maximum_width: INTEGER_32
    			-- Upper bound on width in pixels.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    		ensure -- from EV_HEADER_ITEM
    			bridge_ok: Result = implementation.maximum_width
    			positive_or_zero: Result >= 0

    	minimum_width: INTEGER_32
    			-- Lower bound on width in pixels.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    		ensure -- from EV_HEADER_ITEM
    			bridge_ok: Result = implementation.minimum_width
    			positive_or_zero: Result >= 0

    	frozen object_id: INTEGER_32
    			-- Unique for current object in any given session
    			-- (from IDENTIFIED)
    		ensure -- from IDENTIFIED
    			valid_id: id_object (Result) = Current

    	parent: EV_ITEM_LIST [EV_ITEM]
    			-- Item list containing `Current'.
    			-- (from EV_ITEM)
    		require -- from EV_CONTAINABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_ITEM
    			bridge_ok: Result = implementation.parent

    	pebble: ANY
    			-- Data to be transported by pick and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from  EV_ABSTRACT_PICK_AND_DROPABLE
    			True
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.pebble

    	pebble_function: FUNCTION [ANY, TUPLE, ANY]
    			-- Returns data to be transported by pick and drop mechanism.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from  EV_ABSTRACT_PICK_AND_DROPABLE
    			True
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.pebble_function

    	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)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.pebble_positioning_enabled

    	pebble_x_position: INTEGER_32
    			-- Initial x position for pick and drop relative to `Current'.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.pebble_x_position

    	pebble_y_position: INTEGER_32
    			-- Initial y position for pick and drop relative to `Current'.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.pebble_y_position

    	pixmap: EV_PIXMAP
    			-- Copy of image displayed on `Current'.
    			-- Void if none.
    			-- (from EV_PIXMAPABLE)
    		require -- from EV_PIXMAPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PIXMAPABLE
    			bridge_ok: (Result = Void and implementation.pixmap = Void) or Result.is_equal (implementation.pixmap)

    	target_name: STRING_GENERAL
    			-- Optional textual name describing `Current' pick and drop hole.
    			-- (from EV_ABSTRACT_PICK_AND_DROPABLE)

    	text: STRING_32
    			-- Text displayed in textable.
    			-- (from EV_TEXTABLE)
    		require -- from EV_TEXTABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_TEXTABLE
    			bridge_ok: equal (Result, implementation.text)
    			not_void: Result /= Void
    			cloned: Result /= implementation.text
    			no_carriage_returns: not Result.has ('%R')

    	text_alignment: INTEGER_32
    			-- Current alignment.
    			-- See class EV_TEXT_ALIGNABLE_CONSTANTS for
    			-- possible values.
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_TEXT_ALIGNABLE
    			bridge_ok: Result = implementation.text_alignment

    	user_can_resize: BOOLEAN
    			-- Can a user resize `Current'?
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    		ensure -- from EV_HEADER_ITEM
    			bridge_ok: Result = implementation.user_can_resize

    	width: INTEGER_32
    			-- `Result' is width of `Current' used
    			-- while parented.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    		ensure -- from EV_HEADER_ITEM
    			result_non_negative: Result >= 0

    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

    	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

    	is_center_aligned: BOOLEAN
    			-- Is `Current' center aligned?
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed

    	is_left_aligned: BOOLEAN
    			-- Is `Current' left aligned?
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed

    	is_right_aligned: BOOLEAN
    			-- Is `Current' right aligned?
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed

    	mode_is_drag_and_drop: BOOLEAN
    			-- Is the user interface mode drag and drop?
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.mode_is_drag_and_drop

    	mode_is_pick_and_drop: BOOLEAN
    			-- Is the user interface mode pick and drop?
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.mode_is_pick_and_drop

    	mode_is_target_menu: BOOLEAN
    			-- Is the user interface mode a pop-up menu of targets?
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure then -- from EV_PICK_AND_DROPABLE
    			bridge_ok: Result = implementation.mode_is_target_menu

    	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))

    feature -- Status setting

    	align_text_center
    			-- Display text centered.
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_TEXT_ALIGNABLE
    			alignment_set: is_center_aligned

    	align_text_left
    			-- Display text left aligned.
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_TEXT_ALIGNABLE
    			alignment_set: is_left_aligned

    	align_text_right
    			-- Display text right aligned.
    			-- (from EV_TEXT_ALIGNABLE)
    		require -- from EV_TEXT_ALIGNABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_TEXT_ALIGNABLE
    			alignment_set: is_right_aligned

    	disable_pebble_positioning
    			-- Assign `False' to pebble_positioning_enabled.
    			-- The pick and drop will start at the pointer position.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PICK_AND_DROPABLE
    			pebble_positioning_updated: not pebble_positioning_enabled

    	disable_user_resize
    			-- Prevent `Current' from being resized by users.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    		ensure -- from EV_HEADER_ITEM
    			not_user_can_resize: not user_can_resize

    	enable_pebble_positioning
    			-- Assign `True' to pebble_positioning_enabled.
    			-- Use pebble_x_position and pebble_y_position as the initial coordinates
    			-- for the pick and drop in pixels relative to `Current'.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PICK_AND_DROPABLE
    			pebble_positioning_updated: pebble_positioning_enabled

    	enable_user_resize
    			-- Permit `Current' from being resized by users.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    		ensure -- from EV_HEADER_ITEM
    			user_can_resize: user_can_resize

    	remove_pebble
    			-- Make pebble `Void' and pebble_function `Void,
    			-- Removing transport.
    			-- (from EV_PICK_AND_DROPABLE)
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			pebble_removed: pebble = Void and pebble_function = Void

    	resize_to_content
    			-- Resize `Current' to fully display both pixmap and text.
    			-- As size of text is dependent on `font' of parent, `Current'
    			-- must be parented. Note that the width is still restricted to
    			-- minimum_width and maximum_width.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    			parent_not_void: parent /= Void

    	set_accept_cursor (a_cursor: like accept_cursor)
    			-- Set `a_cursor' to be displayed when the screen pointer is over a
    			-- target that accepts pebble during pick and drop.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			a_cursor_not_void: a_cursor /= Void
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			accept_cursor_assigned: accept_cursor.is_equal (a_cursor)

    	set_deny_cursor (a_cursor: like deny_cursor)
    			-- Set `a_cursor' to be displayed when the screen pointer is not
    			-- over a valid target.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			a_cursor_not_void: a_cursor /= Void
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			deny_cursor_assigned: deny_cursor.is_equal (a_cursor)

    	set_drag_and_drop_mode
    			-- Set user interface mode to drag and drop.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PICK_AND_DROPABLE
    			drag_and_drop_set: mode_is_drag_and_drop

    	set_maximum_width (a_maximum_width: INTEGER_32)
    			-- Assign `a_maximum_width' in pixels to maximum_width.
    			-- If width is greater than `a_maximum_width', resize.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    			a_maximum_width_positive: a_maximum_width >= 0
    			maximum_width_greater_than_or_equal_to_minimum_width: maximum_width >= minimum_width
    		ensure -- from EV_HEADER_ITEM
    			maximum_width_assigned: maximum_width = a_maximum_width

    	set_minimum_width (a_minimum_width: INTEGER_32)
    			-- Assign `a_minimum_width' in pixels to minimum_width.
    			-- If width is less than `a_minimum_width', resize.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    			a_minimum_width_positive: a_minimum_width >= 0
    			minimum_width_less_than_or_equal_to_maximum_width: minimum_width <= maximum_width
    		ensure -- from EV_HEADER_ITEM
    			minimum_width_assigned: minimum_width = a_minimum_width

    	set_pebble (a_pebble: like pebble)
    			-- Assign `a_pebble' to pebble.
    			-- Overrides set_pebble_function.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			a_pebble_not_void: a_pebble /= Void
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			pebble_assigned: pebble = a_pebble

    	set_pebble_function (a_function: FUNCTION [ANY, TUPLE, ANY])
    			-- Set `a_function' to compute pebble.
    			-- It will be called once each time a pick occurs, the result
    			-- will be assigned to pebble for the duration of transport.
    			-- When a pick occurs, the pick position in widget coordinates,
    			-- <<x, y>> in pixels, is passed.
    			-- To handle this data use `a_function' of type
    			-- FUNCTION [ANY, TUPLE [INTEGER, INTEGER], ANY] and return the
    			-- pebble as a function of x and y.
    			-- Overrides set_pebble.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			a_function_not_void: a_function /= Void
    			a_function_takes_two_integer_open_operands: a_function.valid_operands ([1, 1])
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			pebble_function_assigned: pebble_function = a_function

    	set_pebble_position (a_x, a_y: INTEGER_32)
    			-- Set the initial position for pick and drop
    			-- Coordinates are in pixels and are relative to position of `Current'.
    			-- Pebble_positioning_enabled must be `True' for the position to be used,
    			-- use enable_pebble_positioning.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PICK_AND_DROPABLE
    			pebble_position_assigned: pebble_x_position = a_x and pebble_y_position = a_y

    	set_pick_and_drop_mode
    			-- Set user interface mode to pick and drop.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PICK_AND_DROPABLE
    			pick_and_drop_set: mode_is_pick_and_drop

    	set_target_menu_mode
    			-- Set user interface mode to pop-up menu of targets.
    			-- (from EV_PICK_AND_DROPABLE)
    		require -- from EV_PICK_AND_DROPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PICK_AND_DROPABLE
    			target_menu_mode_set: mode_is_target_menu

    	set_target_name (a_name: STRING_GENERAL)
    			-- Assign `a_name' to target_name.
    			-- (from EV_ABSTRACT_PICK_AND_DROPABLE)
    		require -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			a_name_not_void: a_name /= Void
    		ensure -- from EV_ABSTRACT_PICK_AND_DROPABLE
    			target_name_assigned: a_name /= target_name and a_name.is_equal (target_name)

    	set_width (a_width: INTEGER_32)
    			-- Assign `a_width' to width.
    			-- (from EV_HEADER_ITEM)
    		require -- from EV_HEADER_ITEM
    			not_destroyed: not is_destroyed
    			width_non_negative: a_width >= 0
    			width_greater_than_or_equal_to_minimum_width: a_width >= minimum_width
    			width_less_than_or_equal_to_maximum_width: a_width <= maximum_width
    		ensure -- from EV_HEADER_ITEM
    			width_set: width = a_width

    feature -- Element change

    	remove_pixmap
    			-- Remove image displayed on `Current'.
    			-- (from EV_PIXMAPABLE)
    		require -- from EV_PIXMAPABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_PIXMAPABLE
    			pixmap_removed: pixmap = Void

    	remove_text
    			-- Make text `is_empty'.
    			-- (from EV_TEXTABLE)
    		require -- from EV_TEXTABLE
    			not_destroyed: not is_destroyed
    		ensure -- from EV_TEXTABLE
    			text_empty: text.is_empty

    	set_data (some_data: like data)
    			-- Assign `some_data' to data.
    			-- (from EV_ANY)
    		require -- from EV_ANY
    			not_destroyed: not is_destroyed
    		ensure -- from EV_ANY
    			data_assigned: data = some_data

    	set_pixmap (a_pixmap: EV_PIXMAP)
    			-- Display image of `a_pixmap' on `Current'.
    			-- Image of pixmap will be a copy of `a_pixmap'.
    			-- Image may be scaled in some descendents, i.e EV_TREE_ITEM
    			-- See EV_TREE.set_pixmaps_size.
    			-- (from EV_PIXMAPABLE)
    		require -- from EV_PIXMAPABLE
    			not_destroyed: not is_destroyed
    			pixmap_not_void: a_pixmap /= Void

    	set_text (a_text: STRING_GENERAL)
    			-- Assign `a_text' to text.
    			-- (from EV_TEXTABLE)
    		require -- from EV_TEXTABLE
    			not_destroyed: not is_destroyed
    			a_text_not_void: a_text /= Void
    			no_carriage_returns: not a_text.has_code (('%R').natural_32_code)
    		ensure -- from EV_TEXTABLE
    			text_cloned: text.is_equal (a_text) and then text /= a_text

    feature -- Duplication

    	copy (other: like Current)
    			-- Update current object using fields of object attached
    			-- to `other', so as to yield equal objects.
    			-- (from EV_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

    	frozen default: like Current
    			-- Default value of object's type
    			-- (from ANY)

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

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

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

    feature -- Command

    	destroy
    			-- Destroy underlying native toolkit object.
    			-- Render `Current' unusable.
    			-- (from EV_ANY)
    		ensure -- from EV_ANY
    			is_destroyed: is_destroyed

    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)
    		require -- from  EV_ABSTRACT_PICK_AND_DROPABLE
    			True
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES
    			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)
    		require -- from  EV_ABSTRACT_PICK_AND_DROPABLE
    			True
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES
    			not_void: Result /= Void

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

    	pick_ended_actions: EV_PND_FINISHED_ACTION_SEQUENCE
    			-- Actions to be performed when a transport from `Current' ends.
    			-- If transport completed successfully, then event data
    			-- is target. If cancelled, then event data is Void.
    			-- (from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES)
    		ensure -- from EV_PICK_AND_DROPABLE_ACTION_SEQUENCES
    			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_ITEM_ACTION_SEQUENCES)
    		ensure -- from EV_ITEM_ACTION_SEQUENCES
    			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_ITEM_ACTION_SEQUENCES)
    		ensure -- from EV_ITEM_ACTION_SEQUENCES
    			not_void: Result /= Void

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

    feature -- Output

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

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

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

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

    feature -- Platform

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

    feature -- Status Report

    	is_destroyed: BOOLEAN
    			-- Is `Current' no longer usable?
    			-- (from EV_ANY)
    		ensure -- from EV_ANY
    			bridge_ok: Result = implementation.is_destroyed

    invariant
    	column_not_void: column /= Void
    	parented_whilst_in_grid: column.is_displayed implies column.parent.header = parent

    		-- from EV_HEADER_ITEM
    	width_greater_than_or_equal_to_minimum_width: width >= minimum_width
    	width_less_than_or_equal_to_maximum_width: width <= maximum_width
    	minimum_width_less_than_or_equal_to_maximum_width: minimum_width <= maximum_width

    		-- from EV_PICK_AND_DROPABLE
    	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

    		-- from EV_ANY
    	is_initialized: is_initialized
    	is_coupled: implementation /= Void and then implementation.interface = Current
    	default_create_called: default_create_called

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

    		-- from EV_TEXT_ALIGNABLE
    	valid_alignment: (create {EV_TEXT_ALIGNMENT_CONSTANTS}).valid_alignment (text_alignment)

    		-- from EV_TEXTABLE
    	text_not_void: is_usable implies text /= 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_GRID_HEADER_ITEM