Struct ChangeTracker

pub struct ChangeTracker { /* private fields */ }

A change tracker is used to run a callback when a property value changes.

The Change Tracker must be initialized with the Self::init method.

When the property changes, the ChangeTracker is added to a thread local list, and the notify callback is called when the Self::run_change_handlers() method is called

Implementations

impl ChangeTracker

pub fn init<Data, T: Default + PartialEq, EF: Fn(&Data) -> T, NF: Fn(&Data, &T)>( &self, data: Data, eval_fn: EF, notify_fn: NF, )

Initialize the change tracker with the given data and callbacks.

The data is any struct that is going to be passed to the functor. The eval_fn is a function that queries and return the property. And the notify_fn is the callback run if the property is changed

pub fn clear(&self)

Clear the change tracker. No notify function will be called after this.

pub fn run_change_handlers()

Run all the change handler that were queued.

Trait Implementations

impl Default for ChangeTracker

fn default() -> Self

Returns the “default value” for a type.

impl Drop for ChangeTracker

fn drop(&mut self)

Executes the destructor for this type.