Struct Pane 

pub struct Pane { /* private fields */ }

A single pane holding an ordered list of tabs, exactly one of which is active. Renders its own [TabBar]/[Tab] strip (with close “x” and add “+” affordances) above the active tab’s content.

Create with cx.new(|_| Pane::new()), mount as a crate::PaneGroup leaf.

Implementations

impl Pane

pub fn new() -> Self

Starts with zero tabs. The “+” button uses [PlaceholderTab] until Pane::with_new_tab_factory is called.

pub fn with_new_tab_factory( self, factory: impl Fn() -> Box<dyn TabContent> + 'static, ) -> Self

Sets the factory used to create content for tabs opened via the “+” button. Additive over the phase-01 design (not explicitly listed there) — needed because Pane renders its own “+” button and must therefore know how to produce new tab content itself.

pub fn with_tab(self, content: Box<dyn TabContent>) -> Self

Builder that seeds an initial tab without a Context — usable inside a crate::PaneGroup pane factory (which runs before the pane’s own context exists) or any cx.new(|_| Pane::new().with_tab(..)) construction. The seeded tab becomes active.

pub fn add_tab( &mut self, content: Box<dyn TabContent>, cx: &mut Context<'_, Self>, ) -> TabId

Appends a tab and activates it. Returns the new tab’s stable id.

pub fn close_tab(&mut self, idx: usize, cx: &mut Context<'_, Self>) -> bool

Removes the tab at idx, reassigning the active index if needed. Returns true if the pane is now empty (in which case PaneEvent::Empty is emitted for PaneGroup to remove this pane).

pub fn activate(&mut self, idx: usize, cx: &mut Context<'_, Self>)

Activates the tab at idx (no-op if out of range).

pub fn reorder(&mut self, from: usize, to: usize, cx: &mut Context<'_, Self>)

Moves the tab at from to to, preserving which tab is active.

pub fn tab_count(&self) -> usize

Number of open tabs.

pub fn active_index(&self) -> usize

Index of the active tab.

pub fn titles(&self) -> Vec<SharedString>

Titles of every open tab, in order — mainly useful for tests asserting reorder results.

Trait Implementations

impl Default for Pane

fn default() -> Self

Returns the “default value” for a type.

impl EventEmitter<PaneEvent> for Pane

impl Render for Pane

fn render( &mut self, window: &mut Window, cx: &mut Context<'_, Self>, ) -> impl IntoElement

Render this view into an element tree.