Module TreeViewProvider 

TreeViewProvider (Environment)

Implements the TreeViewProvider trait for MountainEnvironment.

This provider manages the lifecycle of custom tree views and orchestrates data flow between the extension host (Cocoon) and the UI (Sky). It handles registration, data dispatching, UI state updates, events, and state persistence.

Implementation Strategy

The trait implementation is split across multiple helper modules for maintainability:

• Registration: RegisterTreeDataProvider, UnregisterTreeDataProvider
• DataAccess: GetChildren, GetTreeItem (dispatcher logic)
• UIState: SetTreeViewMessage, SetTreeViewTitle, SetTreeViewBadge
• Events: OnTreeNodeExpanded, OnTreeSelectionChanged
• StatePersistence: PersistTreeViewState, RestoreTreeViewState
• Visibility: RevealTreeItem, RefreshTreeView

The single impl TreeViewProvider for MountainEnvironment block in this file delegates to those helper functions. This satisfies Rust’s orphan rules while keeping code organized.

Modules

DataAccess 🔒

Tree View Data Access Helpers

Events 🔒

Tree View Event Handlers

Registration 🔒

Tree View Registration Helpers

StatePersistence 🔒

Tree View State Persistence Helpers

UIState 🔒

Tree View UI State Helpers

Visibility 🔒

Tree View Visibility Helpers