automatic ttid which calls addPostFrameCallback within didPush of the navigator observer
manual ttid which calls addPostFrameCallback within a widget's initState that you need to wrap around the widget you want to measure from
Why deprecate the manual version?
After some tests I've come to the conclusion that the automatic version is more accurate than we think (see timeline), there is usually a difference of around 2-5ms (give or take) to the actual frame duration which is negligible.
By deprecating it / removing it in v9 we reduce complexity of the implementation and usage but still report accurate data.
Description
Current state
We currently allow two options:
addPostFrameCallbackwithindidPushof the navigator observeraddPostFrameCallbackwithin a widget'sinitStatethat you need to wrap around the widget you want to measure fromWhy deprecate the manual version?
After some tests I've come to the conclusion that the automatic version is more accurate than we think (see timeline), there is usually a difference of around 2-5ms (give or take) to the actual frame duration which is negligible.
By deprecating it / removing it in v9 we reduce complexity of the implementation and usage but still report accurate data.