Struct data_tracker::DataTracker

pub struct DataTracker<T, K> where
    T: Clone + PartialEq,
    K: Hash + Eq,  { /* fields omitted */ }

Tracks changes to data and notifies listeners.

The data to be tracked is type T.

Callbacks are stored in a HashMap with keys of type K.

See the module-level documentation for more details.

Methods

impl<T, K> DataTracker<T, K> where
    T: Clone + PartialEq,
    K: Hash + Eq, 

fn new(value: T) -> DataTracker<T, K>

Create a new DataTracker which takes ownership of the data of type T.

Callbacks are registered via a key of type K.

fn add_listener(
    &mut self,
    key: K,
    callback: Box<OnChanged<T>>
) -> Option<Box<OnChanged<T>>>

Add a callback that will be called just after a data change is detected.

If a previous callback exists with the key, the original callback is returned as Some(original_callback). Otherwise, None is returned.

fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>>

Remove callback.

If a callback exists with the key, it is removed and returned as Some(callback). Otherwise, None is returned.

fn as_tracked_mut(&mut self) -> Modifier<T, K>

Return a Modifier which can be used to modify the owned data.

Trait Implementations

impl<T, K> AsRef<T> for DataTracker<T, K> where
    T: Clone + PartialEq,
    K: Hash + Eq, 

fn as_ref(&self) -> &T

Performs the conversion.