Function

CGEventSourceSetPixelsPerLine

Sets the scale of pixels per line in a scrolling event source.

Declaration

void CGEventSourceSetPixelsPerLine(CGEventSourceRef source, double pixelsPerLine);

Parameters

source

The event source to access.

pixelsPerLine

The scale of pixels per line in the specified event source.

Discussion

This function sets the scale of pixels per line in the specified event source. For example, if you pass the value 12.0 in the pixelsPerLine parameter, the scale of pixels per line in the event source would be changed to 12.0. Every scrolling event can be interpreted to be scrolling by pixel or by line. By default, the scale is about ten pixels per line. You can retrieve the scale with the function CGEventSourceGetPixelsPerLine.

See Also

Working With Event Sources

CGEventSourceGetTypeID

Returns the type identifier for the opaque type CGEventSourceRef.

CGEventSourceCreate

Returns a Quartz event source created with a specified source state.

CGEventSourceGetKeyboardType

Returns the keyboard type to be used with a Quartz event source.

CGEventSourceSetKeyboardType

Sets the keyboard type to be used with a Quartz event source.

CGEventSourceGetSourceStateID

Returns the source state associated with a Quartz event source.

CGEventSourceButtonState

Returns a Boolean value indicating the current button state of a Quartz event source.

CGEventSourceKeyState

Returns a Boolean value indicating the current keyboard state of a Quartz event source.

CGEventSourceFlagsState

Returns the current flags of a Quartz event source.

CGEventSourceSecondsSinceLastEventType

Returns the elapsed time since the last event for a Quartz event source.

CGEventSourceCounterForEventType

Returns a count of events of a given type seen since the window server started.

CGEventSourceGetUserData

Returns the 64-bit user-specified data for a Quartz event source.

CGEventSourceSetUserData

Sets the 64-bit user-specified data for a Quartz event source.

CGEventSourceGetLocalEventsFilterDuringSuppressionState

Returns the mask that indicates which classes of local hardware events are enabled during event suppression.

CGEventSourceSetLocalEventsFilterDuringSuppressionState

Sets the mask that indicates which classes of local hardware events are enabled during event suppression.

CGEventSourceGetLocalEventsSuppressionInterval

Returns the interval that local hardware events may be suppressed following the posting of a Quartz event.

CGEventSourceSetLocalEventsSuppressionInterval

Sets the interval that local hardware events may be suppressed following the posting of a Quartz event.

CGEventSourceGetPixelsPerLine

Gets the scale of pixels per line in a scrolling event source.