DEFINITION MODULE Mouse33;

	(****************************************************************)
	(*								*)
	(*		   Mouse driver using INT 33H			*)
	(*		to call a resident mouse driver			*)
	(*								*)
	(*	Originally developed by Roger Carvalho and Pat Terry.	*)
	(*	The present version is maintained by Peter Moylan.	*)
	(*								*)
	(*	Last edited:	17 August 1994				*)
	(*								*)
	(****************************************************************)

FROM Mouse0 IMPORT
    (* type *)	Buttons, ButtonSet, EventSet, EventHandler;

PROCEDURE InitialiseMouseDriver(): BOOLEAN;

    (* Does all initialisation needed for this module.  We make this a	*)
    (* procedure rather than an initialisation section because module	*)
    (* Mouse has to decide which mouse driver to use.  The function	*)
    (* result indicates success; if it is FALSE, none of the following	*)
    (* procedures will work.  Note: this is not an end-user procedure,	*)
    (* it's intended to be called only by module Mouse.			*)

PROCEDURE Reset (VAR (*OUT*) MousePresent: BOOLEAN;
			VAR (*OUT*) NumberOfButtons: CARDINAL);

    (* Initializes mouse, returning MousePresent as FALSE if no mouse	*)
    (* available and as TRUE if it is, and NumberOfButtons as the	*)
    (* number of buttons for the mouse if installed.			*)

PROCEDURE ShowCursor;

    (* Turns mouse cursor on. *)

PROCEDURE HideCursor;

    (* Turns mouse cursor off. *)

PROCEDURE GetPosBut (VAR (*OUT*) Buttons: ButtonSet;
				VAR (*OUT*) X, Y : CARDINAL);

    (* Gets position and Button state. *)

PROCEDURE SetCursorPos (X, Y : CARDINAL);

    (* Sets the mouse cursor position. *)

PROCEDURE GetButPress (Button: Buttons;  VAR (*OUT*) Status: ButtonSet;
		VAR (*OUT*) Count: CARDINAL;  VAR (*OUT*) X, Y: CARDINAL);

    (* Gets Button press information. *)

PROCEDURE GetButRelease (Button: Buttons;  VAR (*OUT*) Status : ButtonSet;
				VAR (*OUT*) Count: CARDINAL;
				VAR (*OUT*) X, Y: CARDINAL);

    (* Gets Button release information. *)

PROCEDURE SetHorizontalLimits (MinX, MaxX : CARDINAL);
PROCEDURE SetVerticalLimits (MinY, MaxY : CARDINAL);

    (* Sets the cursor limits. *)

TYPE
    GraphicCursor = RECORD
			ScreenMask,
			CursorMask : ARRAY [0 .. 15] OF BITSET;
			HotX, HotY : INTEGER [-16 .. 16];
                    END (*RECORD*);

PROCEDURE SetGraphicsCursor (Cursor : GraphicCursor);

    (* Sets the graphics cursor shape.  The ScreenMask is first ANDed	*)
    (* into the display, then the CursorMask is XORed into the display.	*)
    (* The hot spot coordinates are relative to the upper-left corner	*)
    (* of the cursor image, and define where the cursor actually	*)
    (* 'points to'.							*)

PROCEDURE SetTextCursor (HardWare: BOOLEAN;  Start, Stop: CARDINAL);

    (* Sets the text cursor.  For the software text cursor, the second	*)
    (* two parameters specify the screen and cursor masks.  The screen	*)
    (* mask is first ANDed into the display, then the cursor mask is	*)
    (* XORed into the display.  For the hardware text cursor, the	*)
    (* second two parameters contain the line numbers of the first and	*)
    (* last scan line in the cursor to be shown on the screen.		*)

PROCEDURE ReadMotionCounters (VAR (*OUT*) X, Y: CARDINAL);

    (* Read motion counters. *)

PROCEDURE SetEventHandler (Mask: EventSet;  Handler: EventHandler);

    (* Establish conditions and Handler for mouse events.  After this,	*)
    (* when an event occurs that is in the Mask, the Handler is called	*)
    (* with the event set that actually happened, the current Button	*)
    (* status, and the cursor X and Y.					*)

PROCEDURE LightPenOn;

    (* Sets light pen on. *)

PROCEDURE LightPenOff;

    (* Sets light pen off. *)

PROCEDURE SetMickeysPerPixel (HorMPP, VertMPP : CARDINAL);

    (* Sets the Mickey / Pixel ratio. *)

PROCEDURE ConditionalOff (Left, Top, Right, Bottom: CARDINAL);

    (* Sets limits within which cursor is on. *)

PROCEDURE SetSpeedThreshold (Threshold : CARDINAL);

    (* Sets mimimum speed Threshold. *)

PROCEDURE SetPage (page: CARDINAL);

    (* Sets the hardware screen page where the mouse is visible. *)

END Mouse33.