indexing
	description: "EiffelVision tree item. Implementation interface."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2006-01-22 18:25:44 -0800 (Sun, 22 Jan 2006) $"
	revision: "$Revision: 56675 $"

deferred class interface
	EV_TREE_ITEM_I

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)

	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

	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)

	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)

	i_th (i: INTEGER_32): EV_TREE_NODE
			-- Item at `i'-th position.
			-- (from EV_DYNAMIC_LIST_I)
		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

	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

	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

	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

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

	parent: EV_TREE_NODE_LIST
			-- Parent of `Current'.
			-- (from EV_TREE_NODE_I)

	parent_imp: EV_ITEM_LIST_I [EV_ITEM]
			-- The parent of the Current widget
			-- Can be void.
			-- (from EV_ITEM_I)

	parent_tree: EV_TREE
			-- Root tree that holds `Current'.
			-- (from EV_TREE_NODE_I)

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

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

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

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

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

	pixmap: EV_PIXMAP
			-- Image displayed on `Current'.
			-- (from EV_PIXMAPABLE_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)

	text: STRING_32
			-- Text displayed in label.
			-- (from EV_TEXTABLE_I)
		ensure -- from EV_TEXTABLE_I
			not_void: Result /= Void
			cloned: Result /= text

	tooltip: STRING_32
			-- Tooltip displayed on `Current'.
			-- (from EV_TOOLTIPABLE_I)
	
feature -- Measurement

	count: INTEGER_32
			-- Number of items.
			-- (from EV_DYNAMIC_LIST_I)
	
feature -- Comparison

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

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

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

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

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

	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

	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

	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_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

	is_expanded: BOOLEAN
			-- is `Current' expanded ?
			-- (from EV_TREE_NODE_I)
		require -- from EV_TREE_NODE_I
			in_tree: parent_tree /= Void

	is_selectable: BOOLEAN
			-- May the `Current' be selected?
			-- (from EV_TREE_NODE_I)

	is_selected: BOOLEAN
			-- Is objects state set to selected?
			-- (from EV_SELECTABLE_I)

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

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

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

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

	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))

	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)
	
feature -- Status setting

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

	disable_select
			-- Deselect the object.
			-- (from EV_DESELECTABLE_I)
		require -- from EV_DESELECTABLE_I
			is_selectable: is_selectable
		ensure -- from EV_DESELECTABLE_I
			deselected: not is_selected

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

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

	enable_select
			-- Select the object.
			-- (from EV_SELECTABLE_I)
		require -- from EV_SELECTABLE_I
			is_selectable: is_selectable
		ensure -- from EV_SELECTABLE_I
			selected: is_selected

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

	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

	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_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_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_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
	
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

	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)

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

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

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

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

	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 -- 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

	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 -- Access EV_DRAGABLE_SOURCE.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	pointer_x: INTEGER_16
			-- (from EV_SHARED_TRANSPORT_I)

	pointer_y: INTEGER_16
			-- (from EV_SHARED_TRANSPORT_I)
	
feature -- Contract support

	pixmap_equal_to (a_pixmap: EV_PIXMAP): BOOLEAN
			-- Is `a_pixmap' equal to pixmap?
			-- (from EV_TREE_NODE_I)
	
feature -- Event handling

	collapse_actions: EV_NOTIFY_ACTION_SEQUENCE
			-- Actions to be performed when collapsed.
			-- (from EV_TREE_NODE_ACTION_SEQUENCES_I)
		ensure -- from EV_TREE_NODE_ACTION_SEQUENCES_I
			not_void: Result /= Void

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

	deselect_actions: EV_NOTIFY_ACTION_SEQUENCE
			-- Actions to be performed when deselected.
			-- (from EV_TREE_NODE_ACTION_SEQUENCES_I)
		ensure -- from EV_TREE_NODE_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

	expand_actions: EV_NOTIFY_ACTION_SEQUENCE
			-- Actions to be performed when expanded.
			-- (from EV_TREE_NODE_ACTION_SEQUENCES_I)
		ensure -- from EV_TREE_NODE_ACTION_SEQUENCES_I
			not_void: Result /= Void

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

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

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

	select_actions: EV_NOTIFY_ACTION_SEQUENCE
			-- Actions to be performed when selected.
			-- (from EV_TREE_NODE_ACTION_SEQUENCES_I)
		ensure -- from EV_TREE_NODE_ACTION_SEQUENCES_I
			not_void: Result /= Void
	
feature -- Output

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

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

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

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

	operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
	
invariant
		-- 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_DYNAMIC_LIST_I
	index_within_bounds: is_usable implies (index >= 0 and then index <= count + 1)

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_ITEM_I