kHoverTapSlop top-level constant Null safety
Maximum distance between the down and up pointers for a tap. (Currently not honored by the TapGestureRecognizer; PrimaryPointerGestureRecognizer, which TapGestureRecognizer inherits from, uses kTouchSlop.)
Implementation
// TODO(ianh): Remove this or implement it correctly.
const double kHoverTapSlop = 20.0;