Struct PaintEngine 

pub struct PaintEngine { /* private fields */ }

Any engine, drawn as a display list. Commands and events pass through; the source’s own requests and answers are consumed here.

Implementations

impl PaintEngine

pub fn new(inner: Arc<dyn WebViewEngine>) -> Arc<PaintEngine>

pub fn with_interval( inner: Arc<dyn WebViewEngine>, interval: Duration, ) -> Arc<PaintEngine>

As Self::new, capturing at most once per interval.

pub fn streaming(inner: Arc<dyn WebViewEngine>) -> Arc<PaintEngine>

An engine drawn from its own pixels, whose page is captured as a display list only while a session shares it with someone watching.

pub fn take_stream(&self) -> Result<Vec<Patch>, Option<Arc<Frame>>>

The patches since the last call, oldest first, or Err with the current frame when the consumer must start over from a whole frame.

Trait Implementations

impl WebViewEngine for PaintEngine

fn create_tab(&self) -> Result<Arc<dyn WebViewEngine>, String>

Create an independent document in the same runtime/profile.

fn set_visible(&self, visible: bool)

Suspend painting without discarding the document or its session history.

fn presented(&self)

A view drew this engine’s page just now. Engines that stop painting pages nobody draws (see paint::PaintEngine) resume here.

fn set_modifiers(&self, modifiers: KeyModifiers)

Keep pointer modifiers current even when no key event reaches the page.

fn take_new_tab_requests(&self) -> Vec<(String, bool)>

Native new-window intents, delivered to browser chrome as tab requests.

fn supports_native_filtering(&self) -> bool

Whether this backend accepts source rules instead of WebKit JSON.

fn send(&self, cmd: WebViewCommand)

Enqueue a command. Must never block on engine work.

fn frames(&self) -> Arc<Mutex<Option<Frame>>>

fn drain_events(&self) -> Vec<WebViewEvent>

Take all pending events, oldest first.

fn request_close(&self) -> bool

Request native close admission. True allows immediate local close; false completes asynchronously through TabClosed, TabDetached or TabCloseBlocked.

fn drain_download_events(&self) -> Vec<WebViewEvent>

Runtime-owned download events, independent of a tab lifetime.

fn set_waker(&self, waker: Box<dyn Fn() + Send + Sync>)

Invoked (from any thread) whenever a new frame or event is ready — typically wired to the winit event loop proxy so idle apps repaint on engine activity. Synchronous engines don’t need one.

fn wrapped(&self) -> Option<&Arc<dyn WebViewEngine>>

The engine this one wraps, for what only a backend can answer.

fn paint_frame(&self) -> Option<Arc<Frame>>

The page as a display list. An engine that has one is drawn from it instead of frames (see paint).

fn take_paint_stream(&self, keyframe: bool) -> Vec<Payload>

The page as a stream for a session to share: a whole frame when keyframe (or when the consumer must start over), else the patches since the last call, followed by images not sent yet. Empty for an engine without a display list.

fn paint_blob(&self, hash: &[u8; 32]) -> Option<Arc<Vec<u8>>>

Encoded bytes of an image a paint_frame references.

fn supports_text_input(&self) -> bool

fn supports_guarded_edit_history(&self) -> bool

Whether original-field acknowledged Undo/Redo is supported.

fn handle_undo_request(&self, request: UndoRequest) -> bool

Offer system Undo/Redo to this page’s native editing history. True means the backend consumed the request, not that a history entry existed or that an asynchronous edit has already completed.

fn text_input(&self, request: Request) -> Option<Receipt>

Private text transactions never enter the app event or page-agent stream.

fn navigate_owned( &self, request_id: u32, command: NavigationCommand, ) -> Result<(), String>

Admit a navigation and reserve its terminal outcome. IDs must increase strictly within this engine’s lifetime and fit a positive CEF signed integer.