    indexing
    	description: "List of images. The list is cached to avoid multiplication of indexes for the same image"
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date$"
    	revision: "$Revision$"

    class interface
    	EV_IMAGE_LIST_IMP

    create
    	make_with_size (a_width, a_height: INTEGER_32)
    			-- Create image list with all images
    			-- `a_width' by `a_height' pixels

    feature -- Initialization

    	make (given_width: INTEGER_32; given_height: INTEGER_32; color_depth: INTEGER_32; masked_bitmap: BOOLEAN)
    			-- Initialization with an empty image list. Images located
    			-- in this imageList must have the a width equal to `given_width'
    			-- and a height equal to `given_height'.
    			--
    			-- The flag `color_depth' determines the color depth of the bitmaps.
    			-- (bitmaps with a different color depth than indicated in
    			-- `image_type' will automatically be converted)
    			-- See Ilc_colorXXXX in WEL_ILC_CONSTANTS for possible values
    			--
    			-- The flag `masked_bitmap' specify whether we are using Bitmaps with mask, or plain
    			-- bitmaps.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			valid_width: given_width > 0
    			valid_height: given_height > 0

    feature -- Access

    	count: INTEGER_32
    			-- Retrieves the number of images in the image list.
    			-- (from WEL_IMAGE_LIST)

    	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)

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

    	last_position: INTEGER_32
    			-- Position of last image inserted/deleted.
    			-- updated by `add_image'.
    			-- (from WEL_IMAGE_LIST)

    	use_masked_bitmap: BOOLEAN
    			-- Does the ImageList contains 'Bitmap+Mask' or
    			-- only 'Bitmap'
    			--
    			-- Note: to use masked bitmap, create the ImageList
    			--       using `Ilc_mask + Ilc_colorXXXX' as `image_type'
    			-- (from WEL_IMAGE_LIST)

    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

    	bitmaps_height: INTEGER_32
    			-- height of all bitmaps located in this imageList
    			-- (from WEL_IMAGE_LIST)

    	bitmaps_width: INTEGER_32
    			-- width of all bitmaps located in this imageList
    			-- (from WEL_IMAGE_LIST)

    	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

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

    	get_background_color: WEL_COLOR_REF
    			-- Retrieves the current background color for this image list.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			exists: exists
    		ensure -- from WEL_IMAGE_LIST
    			result_not_void: Result /= Void

    	pixmap_position (a_pixmap: EV_PIXMAP)
    			-- Update last_position with the position of `a_pixmap'
    			-- in the image list. Set last_position to -1 if `a_pixmap'
    			-- is not present in the image list.
    		require
    			a_pixmap_not_void: a_pixmap /= 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))

    	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)

    feature -- Status setting

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

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

    feature -- Element change

    	add_pixmap (a_pixmap: EV_PIXMAP)
    			-- Add the pixmap `a_pixmap' into the image list.
    			--
    			-- last_position is updated.

    	extend_pixmap (a_pixmap: EV_PIXMAP)
    			-- Add the pixmap `a_pixmap' at the end of the image list.
    			-- Do not test for possible cached version.
    			--
    			-- last_position is updated.

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

    feature -- Removal

    	delete
    			-- Destroy inner structure of `Current'.
    			-- To be called when Current is no more needed
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			reference_not_tracked: not reference_tracked
    		ensure -- from WEL_REFERENCE_TRACKABLE
    			destroyed: not shared implies not exists

    	destroy
    			-- destroy item by calling the
    			-- corresponding Windows function and
    			-- set item to default_pointer.
    			-- (from WEL_IMAGE_LIST)

    	dispose
    			-- Destroy inner structure of `Current'.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from  DISPOSABLE
    			True
    		ensure then -- from WEL_REFERENCE_TRACKABLE
    			internal_object_id_freed: internal_object_id = 0

    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

    	add_bitmap (bitmap_to_add: WEL_BITMAP)
    			-- Add the bitmap `bitmap_to_add' into the image list.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			bitmap_not_void: bitmap_to_add /= Void
    			compatible_width_for_bitmap: bitmap_to_add.width = bitmaps_width
    			compatible_height_for_bitmap: bitmap_to_add.height = bitmaps_height
    			exists: exists

    	add_color_masked_bitmap (bitmap_to_add: WEL_BITMAP; mask_color: WEL_COLOR_REF)
    			-- Add the bitmap `bitmap_to_add' into the image list.
    			-- `mask_color' represents the color used to generate the mask.
    			-- Each pixel of this color in the specified bitmap is changed to black
    			-- and the corresponding bit in the mask is set to 1.
    			--
    			-- Note: Bitmaps with color depth greater than 8bpp are not supported
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			bitmap_not_void: bitmap_to_add /= Void
    			mask_color_not_void: mask_color /= Void
    			compatible_width_for_bitmap: bitmap_to_add.width = bitmaps_width
    			compatible_height_for_bitmap: bitmap_to_add.height = bitmaps_height
    			exists: exists

    	add_icon (icon_to_add: WEL_GRAPHICAL_RESOURCE)
    			-- Adds the icon or cursor `icon_to_add' to this image list
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			icon_not_void: icon_to_add /= Void
    			exists: exists

    	add_masked_bitmap (bitmap_to_add: WEL_BITMAP; bitmap_mask: WEL_BITMAP)
    			-- Add the bitmap `bitmap_to_add' into the image list.
    			-- `bitmap_mask' represents the mask for the bitmap.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			bitmap_not_void: bitmap_to_add /= Void
    			mask_not_void: bitmap_mask /= Void
    			compatible_width_for_bitmap: bitmap_to_add.width = bitmaps_width
    			compatible_height_for_bitmap: bitmap_to_add.height = bitmaps_height
    			compatible_width_for_mask: bitmap_mask.width = bitmaps_width
    			compatible_height_for_mask: bitmap_mask.height = bitmaps_height
    			masked_bitmap_in_use: use_masked_bitmap
    			exists: exists

    	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)

    	get_icon (index, flags: INTEGER_32): WEL_ICON
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			index_not_too_small: index >= 0
    			index_not_too_big: index < count
    			exists: exists

    	remove_all_images (index: INTEGER_32)
    			-- Remove all images from the image list.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			exists: exists

    	remove_image (index: INTEGER_32)
    			-- Remove the image at index `index' from the image list.
    			--
    			-- When an image is removed, the indexes of the remaining images are
    			-- adjusted so that the image indexes always range from zero to one
    			-- less than the number of images in the image list.
    			-- For example, if you remove the image at index 0, then image 1 becomes
    			-- image 0, image 2 becomes image 1, and so on.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			index_not_too_small: index >= 0
    			index_not_too_big: index < count
    			exists: exists

    	replace_bitmap (bitmap_to_add: WEL_BITMAP; index: INTEGER_32)
    			-- Replace the bitmap at position `index' in the imageList by
    			-- `bitmap_to_add'.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			bitmap_not_void: bitmap_to_add /= Void
    			not_use_masked_bitmap: not use_masked_bitmap
    			index_not_too_small: index >= 0
    			index_not_too_big: index < count
    			exists: exists

    	replace_icon (icon_to_add: WEL_GRAPHICAL_RESOURCE; index: INTEGER_32)
    			-- Replace the bitmap at position `index' in the imageList by
    			-- the cursor or icon `icon_to_add'.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			icon_not_void: icon_to_add /= Void
    			index_not_too_small: index >= 0
    			index_not_too_big: index < count
    			exists: exists

    	replace_masked_bitmap (bitmap_to_add: WEL_BITMAP; bitmap_mask: WEL_BITMAP; index: INTEGER_32)
    			-- Replace the bitmap at position `index' in the imageList by
    			-- `bitmap_to_add'.
    			-- `bitmap_mask' represents the mask for the bitmap.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			bitmap_not_void: bitmap_to_add /= Void
    			mask_not_void: bitmap_mask /= Void
    			compatible_width_for_bitmap: bitmap_to_add.width = bitmaps_width
    			compatible_height_for_bitmap: bitmap_to_add.height = bitmaps_height
    			compatible_width_for_mask: bitmap_mask.width = bitmaps_width
    			compatible_height_for_mask: bitmap_mask.height = bitmaps_height
    			masked_bitmap_in_use: use_masked_bitmap
    			index_not_too_small: index >= 0
    			index_not_too_big: index < count
    			exists: exists

    	set_background_color (new_color: WEL_COLOR_REF)
    			-- Sets the background color for this image list.
    			-- (from WEL_IMAGE_LIST)
    		require -- from WEL_IMAGE_LIST
    			new_color_not_void: new_color /= Void
    			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 -- Status Report

    	reference_tracked: BOOLEAN
    			-- Are number references of `Current' tracked?
    			-- (from WEL_REFERENCE_TRACKABLE)

    	references_count: INTEGER_32
    			-- Number of object referring to current object.
    			-- (from WEL_REFERENCE_TRACKABLE)

    feature -- Status Setting

    	decrement_reference
    			-- Decrement number of references to current object.
    			-- When number of references reaches zero,
    			-- delete is called if object is not protected.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			exists: exists
    			tracking_references_started: reference_tracked

    	enable_reference_tracking
    			-- Set `references_tracked' to True.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			exists: exists
    			tracking_reference_not_started: not reference_tracked

    	increment_reference
    			-- Increment number of references to current object.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			exists: exists
    			tracking_references_started: reference_tracked

    	object_id: INTEGER_32
    			-- Runtime Id of `Current'.
    			-- (from WEL_REFERENCE_TRACKABLE)

    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_IMAGE_LIST_IMP