handlePointerMove method
Called when a pointer-move event occurs.
Implementation
@override
void handlePointerMove(MouseMsg event, Offset localPosition) {
if (state != GestureRecognizerState.possible) return;
final delta = localPosition - initialPosition!;
final distance = _magnitude(delta);
if (distance > kTouchSlop) {
// Moved too far — this is not a tap.
addCmd(onTapCancel?.call());
resolve(GestureDisposition.rejected);
}
}