isPointerAllowed method
Checks whether or not a pointer is allowed to be tracked by this recognizer.
Implementation
@override
bool isPointerAllowed(PointerEvent event) {
if (_initialButtons == null) {
switch (event.buttons) {
case kPrimaryButton:
if (onSwipe == null && onCancel == null)
return false;
break;
default:
return false;
}
} else {
// There can be multiple drags simultaneously. Their effects are combined.
if (event.buttons != _initialButtons) {
return false;
}
}
return super.isPointerAllowed(event as PointerDownEvent);
}