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(*
Copyright (c) 2001, 2015
David C.J. Matthews
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 2.1 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
structure Cursor:
sig
type HCURSOR and HINSTANCE
type POINT = { x : int, y: int }
type RECT = { left: int, top: int, right: int, bottom: int }
val hcursorNull : HCURSOR
val isHcursorNull : HCURSOR -> bool
datatype
CursorId =
OCR_APPSTARTING
| OCR_CROSS
| OCR_IBEAM
| OCR_NO
| OCR_NORMAL
| OCR_SIZEALL
| OCR_SIZENESW
| OCR_SIZENS
| OCR_SIZENWSE
| OCR_SIZEWE
| OCR_UP
| OCR_WAIT
val ClipCursor : RECT -> unit
val CopyCursor : HCURSOR -> HCURSOR
val DestroyCursor : HCURSOR -> unit
val GetClipCursor : unit -> RECT
val GetCursor : unit -> HCURSOR
val GetCursorPos : unit -> POINT
val LoadCursor : HINSTANCE * Resource.RESID -> HCURSOR
val LoadCursorFromFile : string -> HCURSOR
val LoadSystemCursor : CursorId -> HCURSOR
val LoadSystemCursorFromFile : CursorId -> HCURSOR
val SetCursor : HCURSOR -> HCURSOR
val SetCursorPos : int * int -> unit
val SetSystemCursor : HCURSOR * CursorId -> unit
val ShowCursor : bool -> int
end
=
struct
local
open Foreign
open Base
open Resource
in
type HCURSOR = HCURSOR and HINSTANCE = HINSTANCE
type RECT = RECT and POINT = POINT
val hcursorNull = hgdiObjNull
and isHcursorNull = isHgdiObjNull
datatype CursorId =
OCR_APPSTARTING (* Standard arrow and small hourglass *)
| OCR_NORMAL (* Standard arrow *)
| OCR_CROSS (* Crosshair *)
| OCR_IBEAM (* I-beam *)
| OCR_NO (* Slashed circle *)
| OCR_SIZEALL (* Four-pointed arrow pointing north, south, east, and west *)
| OCR_SIZENESW (* Double-pointed arrow pointing northeast and southwest *)
| OCR_SIZENS (* Double-pointed arrow pointing north and south *)
| OCR_SIZENWSE (* Double-pointed arrow pointing northwest and southeast *)
| OCR_SIZEWE (* Double-pointed arrow pointing west and east *)
| OCR_UP (* Vertical arrow *)
| OCR_WAIT (* Hourglass *)
local
fun idToInt OCR_APPSTARTING = 32650
| idToInt OCR_NORMAL = 32512
| idToInt OCR_CROSS = 32515
| idToInt OCR_IBEAM = 32513
| idToInt OCR_NO = 32648
| idToInt OCR_SIZEALL = 32646
| idToInt OCR_SIZENESW = 32643
| idToInt OCR_SIZENS = 32645
| idToInt OCR_SIZENWSE = 32642
| idToInt OCR_SIZEWE = 32644
| idToInt OCR_UP = 32516
| idToInt OCR_WAIT = 32514
fun intToId _ = raise Fail "intToId"
in
val CURSORID = absConversion {abs=intToId, rep=idToInt} cDWORD
end
val SetSystemCursor =
winCall2 (user "SetSystemCursor") (cHCURSOR, CURSORID) (successState "SetSystemCursor")
fun checkCursor c = (checkResult(not(isHcursorNull c)); c)
val LoadCursorFromFile =
checkCursor o
winCall1 (user "LoadCursorFromFileA") (cString) cHCURSOR
(* ML extension - simpler than having a separate function. *)
(* I found a note suggesting that it was better to use the Unicode version
because not all implementations handle this properly. *)
val LoadSystemCursorFromFile =
checkCursor o
winCall1 (user "LoadCursorFromFileW") (CURSORID) cHCURSOR
val ClipCursor =
winCall1 (user "ClipCursor") (cConstStar cRect) (successState "ClipCursor")
val CopyCursor =
checkCursor o
winCall1 (user "CopyCursor") (cHCURSOR) cHCURSOR
val DestroyCursor =
winCall1 (user "DestroyCursor") (cHCURSOR) (successState "DestroyCursor")
local
val getClipCursor =
winCall1 (user "GetClipCursor") (cStar cRect) (successState "GetClipCursor")
in
fun GetClipCursor (): RECT =
let
val r = ref { top = 0, bottom = 0, left = 0, right = 0 }
in
getClipCursor r;
!r
end
end
val GetCursor = winCall0 (user "GetCursor") () cHCURSOR
local
val getCursorPos =
winCall1 (user "GetCursorPos") (cStar cPoint) (successState "GetCursorPos")
in
fun GetCursorPos (): POINT =
let
val r = ref { x = 0, y = 0 }
in
getCursorPos r;
!r
end
end
val SetCursor = winCall1 (user "SetCursor") cHCURSOR cHCURSOR
val SetCursorPos =
winCall2 (user "SetCursorPos") (cInt, cInt) (successState "SetCursorPos")
val ShowCursor = winCall1 (user "ShowCursor") cBool cInt
(* Superseded by LoadImage *)
val LoadCursor =
checkCursor o
winCall2 (user "LoadCursorA") (cHINSTANCE, cRESID) cHCURSOR
local
val loadCursor =
checkCursor o winCall2 (user "LoadCursorA") (cHINSTANCE, CURSORID) cHCURSOR
in
fun LoadSystemCursor(id: CursorId) = loadCursor(hinstanceNull, id)
end
(*
TODO:
CreateCursor
a little complicated because it includes bit maps.
*)
end
end;
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