Struct TabDelegate 

pub struct TabDelegate<T: 'static> { /* private fields */ }

Resolves per-tab UI from a model item.

Required: a label callback. Everything else is optional and defaults to “no leading icon, no slots, no tooltip, not closable, not pinned, enabled”.

Implementations

impl<T: 'static> TabDelegate<T>

pub fn new(label: impl Fn(usize, &T) -> LocalizedString + 'static) -> Self

Construct from the label callback. Every other field defaults to its identity behavior.

pub fn icon(self, f: impl Fn(usize, &T) -> Option<IconWidget> + 'static) -> Self

Per-tab leading icon (rendered before the label).

pub fn leading( self, f: impl Fn(usize, &T) -> Option<Box<dyn Widget>> + 'static, ) -> Self

Per-tab leading slot (between the icon and label, or before the label when no icon is present).

pub fn trailing( self, f: impl Fn(usize, &T) -> Option<Box<dyn Widget>> + 'static, ) -> Self

Per-tab trailing slot (between the label and the close button, or at the trailing edge when no close button is present).

pub fn context_menu( self, f: impl Fn(usize, &T) -> Option<ContextMenuFactory> + 'static, ) -> Self

Per-tab context menu factory. Activated by right-click / long-press / accesskit::Action::ShowContextMenu.

The closure runs once per build and returns an optional ContextMenuFactory. The factory itself is called every time the menu opens, returning a fresh menu widget each call — the framework cannot reuse a single widget instance across multiple openings.

pub fn closable(self, f: impl Fn(usize, &T) -> bool + 'static) -> Self

Per-tab closable flag. When true, the tab gets a trailing close button and middle-click / Ctrl+W close affordances. Pinned tabs suppress the close button regardless of this flag (pinned tabs only close via the context menu — Firefox convention).

pub fn pinned(self, f: impl Fn(usize, &T) -> bool + 'static) -> Self

Per-tab pinned flag. Pinned tabs render in a leading non-scrolling region with a fixed icon-only width.

pub fn enabled(self, f: impl Fn(usize, &T) -> bool + 'static) -> Self

Per-tab enabled flag. Disabled tabs are visible but not activatable, skipped by keyboard navigation, and excluded from the close / pin / context-menu affordances.

pub fn tooltip( self, f: impl Fn(usize, &T) -> Option<LocalizedString> + 'static, ) -> Self

Per-tab tooltip text. Shown on hover via the existing WidgetBuilder::tooltip mechanism.

pub fn rich_tooltip_key( self, f: impl Fn(usize, &T) -> Option<String> + 'static, ) -> Self

Per-tab rich-tooltip registry key. Returning Some(key) makes the tab show a rich tooltip resolved against TooltipRegistry.

pub fn rich_tooltip_content_with( self, f: impl Fn(usize, &T) -> Option<TooltipContent> + 'static, ) -> Self

Per-tab inline rich-tooltip content. Skips the registry — useful for tooltips whose body depends on T’s state.

pub fn composite_tooltip_with( self, f: impl Fn(usize, &T) -> Option<Box<dyn Widget>> + 'static, ) -> Self

Per-tab composite-tooltip body factory. Returning Some(boxed_widget) makes the tab show a composite tooltip containing that subtree. The closure runs at tab-header build time (and on every rebuild after data changes), so the body can carry per-tab dynamic state.

Trait Implementations

impl<T: 'static> Debug for TabDelegate<T>

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

Formats the value using the given formatter.