A cell's state, decided and drawn (spec/15 §8.4, D-146).
A cell is always in one state, and every state is drawn deliberately: never a blank
chart, a crash or a host's spinner. of/3 decides the state of a cell's slots at the
board's now; render/3 draws it as the whole cell, where there is no chart, and
banner/3 as one line across the top of a chart, where the last data stays readable.
Each state has a role (spec/08 §7.5, D-135): its color is the drawing's accent and
its cue's glyph (spec/14 §21.7, D-142) stands beside the words, so a state reads in
grayscale as well. Both drawings are in :css mode, so a stylesheet themes them as it
themes the charts.
| State | Role | Words |
|---|---|---|
{:crashed, reason} | :bad | Crashed, restarting |
{:down, reason} | :bad | Feed down and the reason |
{:invalid, errors} | :bad | Wrong binding and the first fault |
:loading | :info | Loading… |
:no_data | :neutral | No data yet |
{:stale, age} | :warning | Stale and the age |
:capped | :info | Capped: part of the window |
:live | — | — |
Examples
iex> Visualize.Board.State.words({:stale, 330})
"Stale: 5m30s old"
iex> Visualize.Board.State.role(:no_data)
:neutral
iex> Visualize.Board.State.banner(:live, Visualize.Theme.default(), 300)
nilSummary
Types
What a cell knows of one slot: its delivery, the delivery's schema and the feed's status.
Functions
A state drawn as a banner across the top of a chart width wide (spec/15 §8.4): an SVG
root one line high, the role's color behind the role's glyph and the words in the
contrast ink of Visualize.Theme.ink/2. nil for :live, which needs none. id: as
render/4 takes it; a board passes <cell root id>-banner (#722).
A state's name, the data-vis-state its drawings carry: "stale", "down", …
The state of a cell's slots at now (spec/15 §8.4), the first that holds of: down (a
slot's feed is down), loading (a slot has no delivery yet), no data (every delivery
empty), stale (a feed the monitor calls stale, or a newest DateTime reading older than
stale_after seconds at now), capped (a delivery is capped), and live. A cell with
no slots is live. Crashed is the board's, which draws it for a cell that cannot.
A state drawn as the whole cell (spec/15 §8.4): an accessible SVG root of {w, h}
titled with the words, the theme's surface filling it inside a frame of the role's
color, and the role's glyph and the words centered in the theme's text. :live is
drawn as the empty surface.
A state's role (spec/08 §7.5), whose color and glyph draw it; nil for :live.
A state's words, as the drawings print them; "" for :live.
Types
@type slot() :: %{ delivery: Visualize.Data.Delivery.t() | nil, schema: Visualize.Data.Schema.t() | nil, status: Visualize.Feed.Monitor.status() }
What a cell knows of one slot: its delivery, the delivery's schema and the feed's status.
@type t() :: :loading | :no_data | :live | :capped | {:stale, number() | nil} | {:down, term()} | {:invalid, [Visualize.Chart.Validator.error(), ...]} | {:crashed, term()}
Functions
@spec banner(t(), Visualize.Theme.t(), number(), keyword()) :: String.t() | nil
A state drawn as a banner across the top of a chart width wide (spec/15 §8.4): an SVG
root one line high, the role's color behind the role's glyph and the words in the
contrast ink of Visualize.Theme.ink/2. nil for :live, which needs none. id: as
render/4 takes it; a board passes <cell root id>-banner (#722).
A state's name, the data-vis-state its drawings carry: "stale", "down", …
@spec of(%{required(atom()) => slot()}, DateTime.t() | nil, number() | nil) :: t()
The state of a cell's slots at now (spec/15 §8.4), the first that holds of: down (a
slot's feed is down), loading (a slot has no delivery yet), no data (every delivery
empty), stale (a feed the monitor calls stale, or a newest DateTime reading older than
stale_after seconds at now), capped (a delivery is capped), and live. A cell with
no slots is live. Crashed is the board's, which draws it for a cell that cannot.
A state drawn as the whole cell (spec/15 §8.4): an accessible SVG root of {w, h}
titled with the words, the theme's surface filling it inside a frame of the role's
color, and the role's glyph and the words centered in the theme's text. :live is
drawn as the empty surface.
id: is the root's id and its title's id stem (spec/14 §4.7, D-188): a board passes the
cell's root id, so two cells in one state never share one (#722). Without it the id is
derived from the title.
@spec role(t()) :: Visualize.Theme.slot() | nil
A state's role (spec/08 §7.5), whose color and glyph draw it; nil for :live.
A state's words, as the drawings print them; "" for :live.