oak.util
Interface ScaleGestureDetector.OnScaleGestureListener

All Known Implementing Classes:

ScaleGestureDetector.SimpleOnScaleGestureListener

Enclosing class:

ScaleGestureDetector

public static interface ScaleGestureDetector.OnScaleGestureListener

Method Summary

boolean	onScale(ScaleGestureDetector detector) Responds to scaling events for a gesture in progress.
boolean	onScaleBegin(ScaleGestureDetector detector) Responds to the beginning of a scaling gesture.
void	onScaleEnd(ScaleGestureDetector detector) Responds to the end of a scale gesture.

Method Detail

onScale

boolean onScale(ScaleGestureDetector detector)

Responds to scaling events for a gesture in progress. Reported by pointer motion.

Parameters:

detector - The detector reporting the event - use this to retrieve extended info about event state.

Returns:

Whether or not the detector should consider this event as handled. If an event was not handled, the detector will continue to accumulate movement until an event is handled. This can be useful if an application, for example, only wants to update scaling factors if the change is greater than 0.01.

onScaleBegin

boolean onScaleBegin(ScaleGestureDetector detector)

Responds to the beginning of a scaling gesture. Reported by new pointers going down.

Parameters:

detector - The detector reporting the event - use this to retrieve extended info about event state.

Returns:

Whether or not the detector should continue recognizing this gesture. For example, if a gesture is beginning with a focal point outside of a region where it makes sense, onScaleBegin() may return false to ignore the rest of the gesture.

onScaleEnd

void onScaleEnd(ScaleGestureDetector detector)

Responds to the end of a scale gesture. Reported by existing pointers going up. Once a scale has ended, ScaleGestureDetector.getFocusX() and ScaleGestureDetector.getFocusY() will return the location of the pointer remaining on the screen.

Parameters:

detector - The detector reporting the event - use this to retrieve extended info about event state.