Trait fidl_fuchsia_ui_focus_ext::FocusChainExt

pub trait FocusChainExtwhere
    Self: Sized,{
    // Required methods
    fn len(&self) -> usize;
    fn duplicate(&self) -> Result<Self, Status>;
    fn koids(
        &self
    ) -> Box<dyn ExactSizeIterator<Item = Result<Koid, Status>> + '_>;
    fn to_focus_koid_chain(&self) -> Result<FocusKoidChain, Status>;

    // Provided methods
    fn is_empty(&self) -> bool { ... }
    fn equivalent<O: FocusChainExt>(&self, other: &O) -> Result<bool, Status> { ... }
}

Extension trait for fidl_fuchsia_ui_focus::FocusChain and fidl_fuchsia_ui_focus::FocusKoidChain.

Required Methods

fn len(&self) -> usize

Returns the number of views in the chain.

fn duplicate(&self) -> Result<Self, Status>

Creates a new chain, in which all of the ViewRefs (or koids) have been duplicated from the original. Returns an error if duplicating any of the ViewRefs fails.

fn koids(&self) -> Box<dyn ExactSizeIterator<Item = Result<Koid, Status>> + '_>

Returns a fallible iterator over the chain’s koids. If any koid cannot be retrieved, the iterator yields an error in its place.

fn to_focus_koid_chain(&self) -> Result<FocusKoidChain, Status>

Converts this chain into a FocusKoidChain, which contains just koids instead of [ViewRef]s.

Provided Methods

fn is_empty(&self) -> bool

Returns true if there are no views in the chain.

fn equivalent<O: FocusChainExt>(&self, other: &O) -> Result<bool, Status>

Returns true if the two chains’ ViewRefs correspond to the same koids, in the same order. If any of the koids cannot be retrieved, returns an error.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl FocusChainExt for FocusChain

fn len(&self) -> usize

fn duplicate(&self) -> Result<Self, Status>

fn koids(&self) -> Box<dyn ExactSizeIterator<Item = Result<Koid, Status>> + '_>

fn to_focus_koid_chain(&self) -> Result<FocusKoidChain, Status>

impl FocusChainExt for FocusKoidChain

fn duplicate(&self) -> Result<Self, Status>

Clones this FocusKoidChain.

fn to_focus_koid_chain(&self) -> Result<FocusKoidChain, Status>

Clones this FocusKoidChain.

fn len(&self) -> usize

fn koids(&self) -> Box<dyn ExactSizeIterator<Item = Result<Koid, Status>> + '_>

Implementors