Struct HelpRegistry 

pub struct HelpRegistry { /* private fields */ }

Central registry mapping widget IDs to help content.

Supports:

• Direct registration via register
• Lazy/deferred registration via register_lazy
• Hierarchical parent chains via set_parent
• Resolution that walks parent chain via resolve

Implementations

impl HelpRegistry

pub fn new() -> Self

Create an empty registry.

pub fn register(&mut self, id: HelpId, content: HelpContent)

Register help content for a widget.

Overwrites any previous content (or lazy provider) for the same ID.

pub fn register_lazy( &mut self, id: HelpId, provider: impl FnOnce() -> HelpContent + Send + 'static, )

Register a lazy provider that will be called on first lookup.

The provider is invoked at most once; its result is cached.

pub fn unregister(&mut self, id: HelpId) -> bool

Remove help content for a widget.

Returns true if content was present.

pub fn set_parent(&mut self, child: HelpId, parent: HelpId) -> bool

Set the parent of a widget in the help hierarchy.

When resolve is called for child and no content is found, the lookup walks to parent (and its ancestors).

Returns false (and does nothing) if setting this parent would create a cycle.

pub fn clear_parent(&mut self, child: HelpId)

Remove the parent link for a widget.

pub fn get(&mut self, id: HelpId) -> Option<&HelpContent>

Get help content for a specific widget (no hierarchy walk).

Forces lazy providers if present.

pub fn peek(&self, id: HelpId) -> Option<&HelpContent>

Peek at help content without forcing lazy providers.

pub fn resolve(&mut self, id: HelpId) -> Option<&HelpContent>

Resolve help content by walking the parent hierarchy.

Returns the first content found starting from id and walking up through parents. Returns None if no content exists in the chain.

pub fn contains(&self, id: HelpId) -> bool

Check whether any help content is registered for this ID (including lazy).

pub fn len(&self) -> usize

Number of registered entries (loaded + lazy).

pub fn is_empty(&self) -> bool

Whether the registry is empty.

pub fn ids(&self) -> impl Iterator<Item = HelpId> + '_

Iterate over all registered IDs.

Trait Implementations

impl Debug for HelpRegistry

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

Formats the value using the given formatter.

impl Default for HelpRegistry

fn default() -> Self

Returns the “default value” for a type.