Struct PlayHead 

pub struct PlayHead { /* private fields */ }

This is one and the only struct we need and have. We do not need to make any of its members public.

Implementations

impl PlayHead

pub fn new() -> Self

The new counter must start paused since “first play” or any “play after pause” is the same.

pub fn play(&mut self) -> bool

• There is no diff bw first play and play after pause
• Here we can just set paused to false and thats it
• We can be in either paused mode or play mode, there are just /these 2 states, there is no third state for play head.
• The time is the time spent in play mode excluding the time spent ///in pause mode.

pub fn time(&self) -> u128

This function will just return the time lapsed in milli seconds. if the counter is in paused state then this value will not change.

pub fn pause(&mut self) -> bool

• pause fn is used to pause the counter and before that add the ///current time into old_time.
• the lapsed_time will not be added again if pause is called ///twice since the old_time is updated only when pause is false. ///once it is true the code inside will not run. to make it false ///again we have to go through play.
• here we can just set pause to true and nothing more.

pub fn stop(&mut self) -> bool

The stop function will reset the counter and bring it back to starting state.

Trait Implementations

impl Debug for PlayHead

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.