startTrackingPointer method

  1. @protected
void startTrackingPointer (int pointer)
@protected

Causes events related to the given pointer ID to be routed to this recognizer.

The pointer events are delivered to handleEvent.

Use stopTrackingPointer to remove the route added by this function.

Implementation 

@protected
void startTrackingPointer(int pointer) {
  GestureBinding.instance.pointerRouter.addRoute(pointer, handleEvent);
  _trackedPointers.add(pointer);
  assert(!_entries.containsValue(pointer));
  _entries[pointer] = _addPointerToArena(pointer);
}