indexing
	description: "Objects that provide common attributes for transport mechanisms."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2006-07-12 15:15:52 -0700 (Wed, 12 Jul 2006) $"
	revision: "$Revision: 61253 $"

class interface
	EV_SHARED_TRANSPORT_I

create 
	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)

feature -- Access

	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)
	
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

	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 -- 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.

	global_drag_targets: ARRAYED_LIST [INTEGER_32]
			-- Shortcut to EV_APPLICATION.pnd_targets.

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

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

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

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

	internal_screen: EV_SCREEN
			-- Once access to an EV_SCREEN.

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

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

	originating_source: EV_DOCKABLE_SOURCE_I
			-- Dragable source that originated the transport of `source_being_dragged'.

	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.
		ensure
			not_parented: insert_label.parent = Void

	remove_insert_sep
			-- Ensure `inset_sep' is not parented.
		ensure
			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.
	
feature -- Access EV_PICK_AND_DROPABLE.

	default_accept_cursor: EV_POINTER_STYLE
			-- Used in lieu of a user defined `accept_cursor'.

	default_deny_cursor: EV_POINTER_STYLE
			-- Used in lieu of a user defined `deny_cursor'.

	default_pixmaps: EV_STOCK_PIXMAPS
			-- Default pixmaps

	global_pnd_targets: HASH_TABLE [INTEGER_32, INTEGER_32]
			-- Shortcut to EV_APPLICATION.pnd_targets.

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

	pointer_x: INTEGER_16

	pointer_y: INTEGER_16
	
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 ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

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_SHARED_TRANSPORT_I