Struct Tab 

pub struct Tab { /* private fields */ }

Tab はブラウザで開かれた 1 つのページを表す構造体です。

主な責務:

• 現在表示しているページのタイトルの保持
• ページ内容を扱う WebView の保持

WebView が「ページそのもの」の状態を管理するのに対し、 Tab は UI 上のタブとしてのメタ情報（タイトルなど）を管理します。

Implementations

impl Tab

pub fn new(system_color_scheme: ColorScheme, js_policy: JsPolicy) -> Self

pub fn tick(&mut self) -> Vec<TabTask>

Tab 内の状態を 1 ステップ進める

• WebView.tick() を呼び出す
• 発生した Task を BrowserApp に返す

pub fn on_css_fetched(&mut self, css: String)

BrowserApp から CSS fetch 完了を通知

pub fn on_fetch_succeeded_html(&mut self, html: String)

BrowserApp からの HTML fetch 完了を通知

pub fn on_fetch_succeeded_css(&mut self, css: String)

pub fn on_fetch_succeeded_css_from(&mut self, css: String, stylesheet_url: &Url)

pub fn on_fetch_succeeded_image(&mut self, source: String, bytes: &[u8])

Delivers encoded image bytes to the page that requested them.

pub fn on_fetch_succeeded_audio(&mut self, source: String, bytes: &[u8])

Delivers encoded audio bytes to the page that requested them.

pub fn on_fetch_succeeded_script(&mut self, index: usize, source: String)

Delivers a fetched external classic script in document order.

pub fn on_fetch_failed_script(&mut self, index: usize)

Skips a failed external classic script without replacing the page.

pub fn on_fetch_succeeded_dynamic_script( &mut self, node_id: u64, source: String, )

pub fn on_fetch_failed_dynamic_script(&mut self, node_id: u64)

pub fn on_fetch_succeeded_dynamic_style(&mut self, node_id: u64, source: String)

pub fn on_fetch_failed_dynamic_style(&mut self, node_id: u64)

pub fn on_fetch_succeeded_iframe(&mut self, dom_id: u64, html: String)

Installs fetched HTML as an <iframe> element’s contentDocument.

pub fn on_fetch_failed_iframe(&mut self, dom_id: u64)

Marks an iframe load as failed so later contentDocument accesses do not keep re-queuing a fetch.

pub fn on_fetch_succeeded_js( &mut self, request_id: u64, response: BrowserResponse, redirected: bool, )

Delivers a completed JavaScript fetch() response.

pub fn on_fetch_failed_js(&mut self, request_id: u64, reason: String)

Delivers a JavaScript fetch() network failure without navigating away.

pub fn inspect(&mut self, method: &str, params: &str) -> Result<Value, String>

Answers a DevTools inspection query against this tab’s page.

pub fn draw(&mut self, cmd_buf: &mut Vec<DrawCommand>, width: f32, height: f32)

pub fn handle_mouse_input( &mut self, px: f32, py: f32, state: ElementState, ) -> (bool, bool)

pub fn handle_pointer_move(&mut self, px: f32, py: f32) -> (bool, bool)

Dispatches a pointer move and updates hover state without touching click bookkeeping. Unlike Tab::handle_mouse_input it never synthesizes press/release events, so it is safe to call on every cursor movement.

pub fn dispatch_text_input(&self, event: InputTextEvent) -> bool

Sends a text-input event (key, insert, composition) to the focused text input, if one exists.

pub fn defocus_text_input(&self) -> bool

Defocuses any focused text input.

pub fn link_at(&self, px: f32, py: f32) -> Option<String>

Returns the href of the link under the given page coordinates, if any.

pub fn scroll_at( &mut self, px: f32, py: f32, dx: f32, dy: f32, viewport: (f32, f32), )

Scrolls the scrollable container under the cursor.

pub fn has_layout(&self) -> bool

Whether this tab has a layout tree ready for drawing or hit-testing.

pub fn is_text_input_composing(&self) -> bool

Whether the currently focused text input is in the middle of a composition (e.g. IME preedit).

pub fn on_devtools_response(&mut self, id: u64, result: String)

Settles a DevTools inspection request with its JSON envelope.

pub fn on_fetch_failed(&mut self, err: BrowserNetworkError, failed_url: Url)

Display error page on fetch failure

pub fn navigate(&mut self, url: Url)

pub fn go_back(&mut self) -> bool

Navigates to the previous URL in the history, if any.

Returns false when there is no history to go back to.

pub fn reload(&mut self)

Reloads the current document, if one is loaded.

pub fn can_go_back(&self) -> bool

Returns whether the back button can navigate to a previous page.

pub fn move_to(&mut self, href: &str)

pub fn relayout(&mut self, viewport: (f32, f32))

pub fn on_js_click(&mut self, dom_id: u32) -> bool

Dispatches a click on a DOM node to the page’s JS onclick handler.

Returns whether the click mutated the DOM and needs a redraw.

pub fn set_system_color_scheme(&mut self, scheme: ColorScheme)

pub fn title(&self) -> Option<String>

Returns title of the document

pub fn document_url(&self) -> Option<Url>

Returns document url

pub fn needs_redraw(&self) -> bool

pub fn clear_redraw_flag(&mut self)

pub fn set_js_policy(&mut self, policy: JsPolicy)

Trait Implementations

impl Debug for Tab

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

Formats the value using the given formatter.

impl Default for Tab

fn default() -> Self

Returns the “default value” for a type.