Struct HeldImages 

pub struct HeldImages { /* private fields */ }

Encoded pictures by address, shared with the fetcher of every store Self::store made.

Implementations

impl HeldImages

pub fn hold(&self, encoded: &[u8]) -> String

Hold encoded (PNG, JPEG or WebP) and return the address an ImageStore from Self::store loads it by. The same bytes always get the same address, so a picture is decoded once however often it is held.

pub fn hold_text(&self, text: &str) -> String

Hold a picture kept as picture_text (a record field), decoding it only when a store loads it, off the UI thread. Empty text holds nothing and returns an empty address, which no store loads.

pub fn holds(&self, address: &str) -> bool

pub fn retain(&self, addresses: &HashSet<String>)

Keep only the pictures at addresses, so pictures no one shows any more are not kept forever.

pub fn fetcher(&self) -> Arc<dyn Fn(&str) -> Option<Vec<u8>> + Send + Sync>

A fetcher that answers held addresses and nothing else.

pub fn store(&self) -> ImageStore

An image store that loads held pictures.

Trait Implementations

impl Clone for HeldImages

fn clone(&self) -> HeldImages

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HeldImages

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

Formats the value using the given formatter.

impl Default for HeldImages

fn default() -> HeldImages

Returns the “default value” for a type.