Enum TabGroupEvent 

#[non_exhaustive]
pub enum TabGroupEvent {
    Drop {
        panel: PanelId,
        source: NodeId,
        target: InsertTarget,
    },
    DragDrop {
        item: AnyDrag,
        target: DropTarget,
    },
    ClosePanel {
        panel: PanelId,
    },
    ActiveChanged {
        ix: usize,
    },
    ZoomIn,
    ZoomOut,
}

Everything gpui_base::dock exports, so a consumer never has to depend on the foundation crate directly to write a skin or read a container’s state. Kept in step with base’s own list by every_base_dock_export_is_reachable_from_here.

Two names are handled elsewhere and one is deliberately absent: base’s Panel and PanelView arrive as BasePanel and BasePanelView because this module’s Panel/PanelView are the presentation halves that extend them, and base’s Dock — a plain state struct holding one dock’s open, collapsible, size and resizing flags — is not re-exported at all, because the name meant a panel container in every released version of this crate and handing it back with a different meaning is worse than dropping it. A skin reads a dock through DockContext. Behavior a tab group cannot carry out on its own.

Every variant here ends in an edit to the layout tree, and the tree belongs to the container that owns this group. Reporting the intent instead of reaching for the container keeps the whole detach-then-reinsert dance — and the reentrancy it used to provoke — out of the group entirely.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Drop

A panel was dropped on this group. target says where in the tree it lands; the container applies it as a single PaneTree::move_panel.

Fields

panel: PanelId

source: NodeId

target: InsertTarget

DragDrop

A host-owned drag landed on this group.

Fields

item: AnyDrag

target: DropTarget

ClosePanel

The user asked to close panel.

Fields

panel: PanelId

ActiveChanged

The displayed tab changed, so the tree’s stored active_ix is stale.

Fields

ix: usize

ZoomIn

This group asked to fill the whole dock. The container installs the group as its zoomed view, chrome and all — the tab bar is where the control that zooms back out lives.

ZoomOut

This group gave the dock back.

Trait Implementations

impl EventEmitter<TabGroupEvent> for TabGroup