Battery service

Create or retrieve this service with page.battery(**properties). Ruflet reuses the registered service unless you supply a different id.

Example

battery = text(value: "Reading battery…")
page.add(battery)
page.get_battery_level(on_result: ->(level, error) {
  value = error ? error.to_s : "Battery: #{level}%"
  page.update(battery, value: value)
})

Page accessor

• page.battery(**props)

Properties

• data — Arbitrary value you can attach to the control and read back in handlers.
• key — Stable identity used to preserve state across rebuilds.

Events

• on_state_change — Fired when the control's state changes.

Page convenience methods

Use these one-shot Page calls when you do not need to keep the service object:

• page.get_battery_level(timeout: ..., on_result: ...)
• page.get_battery_state(timeout: ..., on_result: ...)
• page.is_in_battery_save_mode(timeout: ..., on_result: ...)
• page.battery_save_mode?(timeout: ..., on_result: ...)

Result and error handling

Client calls are asynchronous. When a method accepts on_result:, handle both callback values: |result, error|. Availability and returned data can vary by platform.

Common service API

The service also supports the common Ruflet control API: attach_handler(event_name, handler), children, emit(event_name, event), has_handler?(event_name), id, merge_props(values = ...), on(event_name, &block), props, runtime_page, runtime_page=, to_patch, type, wire_id, wire_id=.

Use the named methods above for application code; common control methods mainly support event registration, updates, and runtime integration.

Wire reference

• Service helper: battery
• Wire type: battery