Trait Operation 

pub trait Operation<T = ()>: Send {
    // Required method
    fn traverse(&mut self, operate: &mut dyn FnMut(&mut dyn Operation<T>));

    // Provided methods
    fn container(&mut self, _id: Option<&Id>, _bounds: Rectangle) { ... }
    fn scrollable(
        &mut self,
        _id: Option<&Id>,
        _bounds: Rectangle,
        _content_bounds: Rectangle,
        _translation: Vector,
        _state: &mut dyn Scrollable,
    ) { ... }
    fn focusable(
        &mut self,
        _id: Option<&Id>,
        _bounds: Rectangle,
        _state: &mut dyn Focusable,
    ) { ... }
    fn text_input(
        &mut self,
        _id: Option<&Id>,
        _bounds: Rectangle,
        _state: &mut dyn TextInput,
    ) { ... }
    fn text(&mut self, _id: Option<&Id>, _bounds: Rectangle, _text: &str) { ... }
    fn custom(
        &mut self,
        _id: Option<&Id>,
        _bounds: Rectangle,
        _state: &mut (dyn Any + 'static),
    ) { ... }
    fn finish(&self) -> Outcome<T> { ... }
    fn set_window_id(&mut self, _id: Id) { ... }
    fn pre_operation(&mut self, _id: Option<&Id>) { ... }
}

A piece of logic that can traverse the widget tree of an application in order to query or update some widget state.

Required Methods

fn traverse(&mut self, operate: &mut dyn FnMut(&mut dyn Operation<T>))

Requests further traversal of the widget tree to keep operating.

The provided operate closure may be called by an Operation to return control to the widget tree and keep traversing it. If the closure is not called, the children of the widget asking for traversal will be skipped.

Provided Methods

fn container(&mut self, _id: Option<&Id>, _bounds: Rectangle)

Operates on a widget that contains other widgets.

fn scrollable( &mut self, _id: Option<&Id>, _bounds: Rectangle, _content_bounds: Rectangle, _translation: Vector, _state: &mut dyn Scrollable, )

Operates on a widget that can be scrolled.

fn focusable( &mut self, _id: Option<&Id>, _bounds: Rectangle, _state: &mut dyn Focusable, )

Operates on a widget that can be focused.

fn text_input( &mut self, _id: Option<&Id>, _bounds: Rectangle, _state: &mut dyn TextInput, )

Operates on a widget that has text input.

fn text(&mut self, _id: Option<&Id>, _bounds: Rectangle, _text: &str)

Operates on a widget that contains some text.

fn custom( &mut self, _id: Option<&Id>, _bounds: Rectangle, _state: &mut (dyn Any + 'static), )

Operates on a custom widget with some state.

fn finish(&self) -> Outcome<T>

Finishes the Operation and returns its Outcome.

fn set_window_id(&mut self, _id: Id)

Track the active window id being processed if relevant to the operation

fn pre_operation(&mut self, _id: Option<&Id>)

Used to mark the beginning of operations for a widget and its children

Implementors

impl<T, O> Operation<O> for Box<T>

where T: Operation<O> + ?Sized,