Struct EmptyState 

pub struct EmptyState {
    pub feed: String,
    pub cause: Cause,
    pub detail: String,
    pub hint: String,
}

A pane’s named empty state: WHICH feed is empty, WHY, and (optionally) what fills it.

Construct it at the point the read comes back empty — the constructor takes the feed name and the cause, because a pane that cannot name its own feed has no business drawing an empty state for it.

Fields

feed: String

The feed, named the way an operator would go look it up: an RPC path (dwarf.v1/Dwarf.History), a warehouse table (mimir/binary_facts), a file ($DWARVES_FLEET_RUN). Never a vague noun like “the backend”.

cause: Cause

Why it produced nothing.

detail: String

The concrete detail behind the cause — the endpoint that refused, the path that was absent, the row count that was zero. One line, plain words.

hint: String

Optional: the action that would fill the feed (a command, an env var to set).

Implementations

impl EmptyState

pub fn new( feed: impl Into<String>, cause: Cause, detail: impl Into<String>, ) -> Self

A named empty state. feed and detail are both required — see the module note.

pub fn no_rows(feed: impl Into<String>, detail: impl Into<String>) -> Self

The feed was read and holds nothing (0 rows).

pub fn unreachable(feed: impl Into<String>, detail: impl Into<String>) -> Self

The feed could not be reached.

pub fn not_configured( feed: impl Into<String>, detail: impl Into<String>, ) -> Self

The feed is not wired in this build/config.

pub fn with_hint(self, hint: impl Into<String>) -> Self

Add the action that would fill the feed.

pub fn ui(&self, ui: &mut Ui)

Draw it. A dim glyph, the cause word, the feed name in monospace (it is a lookup key, so it is typeface-distinct from prose), the detail, and the hint. Nothing here is clickable and nothing is coloured green — an empty state that looks like a healthy result is the bug this component exists to prevent.

pub fn state_json(&self) -> Value

The oracle half — fold into the pane’s own state_json so a test can assert the pane is in a NAMED empty state (and is therefore not painting sample rows).

pub fn line(&self) -> String

A one-line render for a host that has no room for the block form (a status bar, a tooltip, a #[test] message).

Trait Implementations

impl Clone for EmptyState

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EmptyState

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for EmptyState

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for EmptyState

impl PartialEq for EmptyState

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for EmptyState

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for EmptyState