SVScratchpadMonitorImpl.mesa
Last edited by Bier on February 16, 1987 11:30:52 pm PST
Copyright © 1984 by Xerox Corporation. All rights reserved.
Contents: A flexible setup, suggested by Scott McGregor, for processing mouse input as fast as you can (but no faster). I will use it to synchronize my mouse point processing with the mousepoint. If the processing algorithms become faster, this procedure will still do the right thing.
DIRECTORY
Menus, Process, SVScratchpad, SVScratchpadUser, SV2d, SVInterfaceTypes, SVScratchpadMonitor, SVViewerTool, ViewerClasses;
SVScratchpadMonitorImpl:
MONITOR
IMPORTS Process, SVScratchpad, SVScratchpadUser
EXPORTS SVScratchpadMonitor =
BEGIN
MouseButton: TYPE = Menus.MouseButton;
Point2d: TYPE = SV2d.Point2d;
ScratchpadData: TYPE = SVInterfaceTypes.ScratchpadData;
Viewer: TYPE = ViewerClasses.Viewer;
globalProcess: PROCESS ← NIL;
screenCoords: Point2d;
clickAtom: ATOM;
spData: ScratchpadData ← NIL;
globalNew: BOOL ← FALSE;
NewMotion:
PUBLIC
ENTRY
PROC [pt: Point2d, atom:
ATOM, scratchpadData: ScratchpadData] = {
globalNew ← TRUE;
screenCoords ← pt;
spData ← scratchpadData;
clickAtom ← atom;
IF globalProcess = NIL THEN Process.Detach[globalProcess ← FORK Painter];
};
Painter:
PROC = {
WHILE New[]
DO
Dispatch[screenCoords, clickAtom, spData];
ENDLOOP;
};
New:
PUBLIC
ENTRY
PROC
RETURNS [x:
BOOL] = {
x ← globalNew;
globalNew ← FALSE;
IF NOT x THEN globalProcess ← NIL; -- no mouse action. Let process die.
};
Dispatch:
PROC [controlPoint: Point2d, atom:
ATOM, scratchpadData: ScratchpadData] = {
SELECT atom
FROM
$MOVE => {
IF scratchpadData.mode = drawLin THEN SVScratchpad.MoveLinPoint[controlPoint, scratchpadData]
ELSE SVScratchpad.MoveRevoPoint[controlPoint, scratchpadData];
};
$MOVESTART => {
IF scratchpadData.mode = drawLin THEN SVScratchpad.MoveLinStart[controlPoint, scratchpadData]
ELSE SVScratchpad.MoveRevoStart[controlPoint, scratchpadData];
};
$MOVEEND => {
self: Viewer ← scratchpadData.scratchViewerData.scratchpad;
SVScratchpadUser.DrawSceneButton[self, scratchpadData.scratchViewerData, red, FALSE, FALSE]
};
ENDCASE;
};
END.