| IO | Parameter | Type | Description
|
| in | theCADArea | longint | Area ID
|
| out | theMouseWheelUse | integer | A mouse wheel use constant
|
| out | theScrollModifiersToZoom | longint | A mask of modifier key constants
|
| out | theZoomDirection | integer | A mouse wheel zoom constant
|
| out | function result | OSErr | Error result code, also see Error handling
|