GetThemeTrackThumbPositionFromRegion

Obtains the relative position of a track's indicator, given its current position.



 
pascal OSStatus GetThemTrackThumbPositionFromRegion (

                     const ThemeTrackDrawInfo *drawInfo,

                     RgnHandle thumbRgn,

                     SInt32 *relativePosition);

drawInfo: A pointer to a structure of type ThemeTrackDrawInfo . Before calling GetThemeTrackThumbPositionFromRegion , set the structure to contain the current visual characteristics of the track.
thumbRgn: A value of type RgnHandle . Before calling GetThemeTrackThumbPositionFromRegion set the region to contain the actual dimensions and position of the indicator, in local coordinates.
relativePosition: A pointer to a signed 32-bit value. On return, this value contains the new distance, in pixels, between the minimum end of the track and the near side of the indicator.
function result: A result code; see Result Codes .

DISCUSSION

Your application can use the GetThemeTrackThumbPositionFromRegion function to respond to the kControlMsgCalcValueFromPos control definition message.

VERSION NOTES

Available with Appearance Manager 1.1 and later.