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57 lines
1.2 KiB
Lua
57 lines
1.2 KiB
Lua
--[=[
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@c Clock x Emitter
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@t ui
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@mt mem
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@d Used to periodically execute code according to the ticking of the system clock instead of an arbitrary interval.
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]=]
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local timer = require('timer')
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local Emitter = require('utils/Emitter')
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local date = os.date
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local setInterval, clearInterval = timer.setInterval, timer.clearInterval
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local Clock = require('class')('Clock', Emitter)
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function Clock:__init()
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Emitter.__init(self)
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end
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--[=[
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@m start
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@op utc boolean
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@r nil
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@d Starts the main loop for the clock. If a truthy argument is passed, then UTC
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time is used; otherwise, local time is used. As the clock ticks, an event is
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emitted for every `os.date` value change. The event name is the key of the value
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that changed and the event argument is the corresponding date table.
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]=]
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function Clock:start(utc)
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if self._interval then return end
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local fmt = utc and '!*t' or '*t'
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local prev = date(fmt)
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self._interval = setInterval(1000, function()
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local now = date(fmt)
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for k, v in pairs(now) do
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if v ~= prev[k] then
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self:emit(k, now)
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end
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end
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prev = now
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end)
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end
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--[=[
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@m stop
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@r nil
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@d Stops the main loop for the clock.
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]=]
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function Clock:stop()
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if self._interval then
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clearInterval(self._interval)
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self._interval = nil
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end
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end
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return Clock
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