Struct egui::util::undoer::Undoer[−][src]

pub struct Undoer<State> { /* fields omitted */ }

Automatic undo system.

Every frame you feed it the most recent state. The Undoer compares it with the latest undo point and if there is a change it may create a new undo point.

Undoer follows two simple rules:

  1. If the state has changed since the latest undo point, but has remained stable for stable_time seconds, an new undo point is created.
  2. If the state does not stabilize within auto_save_interval seconds, an undo point is created.

Rule 1) will make sure an undo point is not created until you stop dragging that slider. Rule 2) will make sure that you will get some undo points even if you are constantly changing the state.

Implementations

impl<State> Undoer<State> where
    State: Clone + PartialEq, [src]

pub fn has_undo(&self, current_state: &State) -> bool[src]

Do we have an undo point different from the given state?

pub fn is_in_flux(&self) -> bool[src]

Return true if the state is currently changing

pub fn undo(&mut self, current_state: &State) -> Option<&State>[src]

pub fn add_undo(&mut self, current_state: &State)[src]

Add an undo point if, and only if, there has been a change since the latest undo point.

  • time: current time in seconds.

pub fn feed_state(&mut self, current_time: f64, current_state: &State)[src]

Call this as often as you want (e.g. every frame) and Undoer will determine if a new undo point should be created.

  • current_time: current time in seconds.

Trait Implementations

impl<State: Clone> Clone for Undoer<State>[src]

fn clone(&self) -> Undoer<State>[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl<State> Debug for Undoer<State>[src]

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

Formats the value using the given formatter. Read more

impl<State: Default> Default for Undoer<State>[src]

fn default() -> Undoer<State>[src]

Returns the “default value” for a type. Read more

Auto Trait Implementations

impl<State> RefUnwindSafe for Undoer<State> where
    State: RefUnwindSafe, 

impl<State> Send for Undoer<State> where
    State: Send, 

impl<State> Sync for Undoer<State> where
    State: Sync, 

impl<State> Unpin for Undoer<State> where
    State: Unpin, 

impl<State> UnwindSafe for Undoer<State> where
    State: UnwindSafe, 

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.