Programming with QuickTime VR

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QTVRMouseDown

You can use the QTVRMouseDown function to handle the user's clicking the mouse button when the cursor is in a QuickTime VR movie for which mouse-down tracking is disabled.

OSErr QTVRMouseDown (QTVRInstanceqtvr,
                     Pointpt,
                     UInt32 when,
                     UInt16 modifiers,
                     UInt32*hotSpotID,
                     WindowPtr w);
qtvr
An instance of a QuickTime VR movie.
pt
The current location of the cursor, in the local coordinates of the graphics world specified by the w parameter.
when
The time, in the number of ticks since system startup, when the mouse-down event was posted.
modifiers
A short integer that contains information about the state of the modifier keys and the mouse button at the time the event was posted. See the chapter "Event Manager" in Inside Macintosh: Macintosh Toolbox Essentials for a description of the information encoded in this parameter.
hotSpotID
On entry, a pointer to a long integer. On exit, that long integer contains the ID of the hot spot that lies beneath the specified point, or the value 0 if no hot spot lies beneath that point.
w
A pointer to a graphics world.
function result
A result code.

DESCRIPTION

The QTVRMouseDown function returns, in the long integer pointed to by the hotSpotID parameter, the ID of the hot spot in the QuickTime VR movie specified by the qtvr parameter that lies directly under the point specified by the pt parameter. If no hot spot lies under that point, the long integer is set to 0. QTVRMouseDown also performs any other tasks that are typically performed when the user clicks the mouse button when the cursor is in a QuickTime VR movie.

SPECIAL CONSIDERATIONS

You need to call QTVRMouseDown only if you have disabled mouse-down tracking for the specified QuickTime VR movie.

SEE ALSO

Use QTVRSetMouseDownTracking (link) to change the mouse-down tracking state of a QuickTime VR movie. Use QTVRMouseStillDown (next) and QTVRMouseUp (link) to handle the mouse button's being held down and released.

© 1997 Apple Computer, Inc.

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