Trait UndoManagerClient 

pub trait UndoManagerClient: Sized + 'static {
    // Required methods
    fn handle_platform_undo(
        self: Handle<Self>,
        app: &mut App,
        direction: UndoDirection,
    );
    fn undo(self: Handle<Self>, app: &mut App);
    fn redo(self: Handle<Self>, app: &mut App);
    fn can_undo(self: Handle<Self>, app: &App) -> bool;
    fn can_redo(self: Handle<Self>, app: &App) -> bool;

    // Provided method
    fn as_undo_manager_client(self: Handle<Self>) -> AnyUndoManagerClient { ... }
}

An interface to receive events from a native UndoManager.

Dart’s mixin UndoManagerClient.

Required Methods

fn handle_platform_undo( self: Handle<Self>, app: &mut App, direction: UndoDirection, )

Requests that the client perform an undo or redo operation.

Currently only used on iOS 9+ when the undo or redo methods are invoked by the platform. For example, when using three-finger swipe gestures, the iPad keyboard, or voice control.

fn undo(self: Handle<Self>, app: &mut App)

Reverts the value on the stack to the previous value.

fn redo(self: Handle<Self>, app: &mut App)

Updates the value on the stack to the next value.

fn can_undo(self: Handle<Self>, app: &App) -> bool

Will be true if there are past values on the stack.

fn can_redo(self: Handle<Self>, app: &App) -> bool

Will be true if there are future values on the stack.

Provided Methods

fn as_undo_manager_client(self: Handle<Self>) -> AnyUndoManagerClient

This client as the erased AnyUndoManagerClient.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors