SimpleOnScaleGestureListener
open class SimpleOnScaleGestureListener : ScaleGestureDetector.OnScaleGestureListener
A convenience class to extend when you only want to listen for a subset of scaling-related events. This implements all methods in OnScaleGestureListener but does nothing. OnScaleGestureListener#onScale(ScaleGestureDetector) returns false so that a subclass can retrieve the accumulated scale factor in an overridden onScaleEnd. OnScaleGestureListener#onScaleBegin(ScaleGestureDetector) returns true.
Summary
| Public methods |
| open Boolean |
Responds to scaling events for a gesture in progress.
|
| open Boolean |
Responds to the beginning of a scaling gesture.
|
| open Unit |
Responds to the end of a scale gesture.
|
Public constructors
SimpleOnScaleGestureListener
SimpleOnScaleGestureListener()
Public methods
onScale
open fun onScale(detector: ScaleGestureDetector): Boolean
Responds to scaling events for a gesture in progress. Reported by pointer motion.
| Return |
Boolean |
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
open fun onScaleBegin(detector: ScaleGestureDetector): Boolean
Responds to the beginning of a scaling gesture. Reported by new pointers going down.
| Return |
Boolean |
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. |
