47 lines
1.6 KiB
Lua
47 lines
1.6 KiB
Lua
-- selene: allow(unscoped_variables)
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actionQueue = {
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---@type table<any, { coroutine: thread, expireTimeMs: number }>
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queue = {},
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}
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---@alias Action fun(deltaSeconds: number)
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--selene: allow(incorrect_standard_library_use)
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local close = coroutine.close
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--- Added actions will be called on every runWaiting() update.
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--- They will continue to be executed until they return Succeeded or Failed instead of NeedsMoreTime.
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---
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--- Replaces any existing action with the given id.
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--- If the initial call of action() doesn't return NeedsMoreTime, this function will not bother adding it to the queue.
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---@param id any
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---@param maxTimeMs number
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---@param action Action
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function actionQueue:upsert(id, maxTimeMs, action)
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if self.queue[id] then
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close(self.queue[id].coroutine)
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end
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self.queue[id] = {
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coroutine = coroutine.create(action),
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expireTimeMs = maxTimeMs + playdate.getCurrentTimeMilliseconds(),
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}
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end
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--- Must be called on every playdate.update() to check for (and run) any waiting tasks.
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--- Actions that return NeedsMoreTime will not be removed from the queue unless they have expired.
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function actionQueue:runWaiting(deltaSeconds)
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local currentTimeMs = playdate.getCurrentTimeMilliseconds()
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for id, actionObject in pairs(self.queue) do
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coroutine.resume(actionObject.coroutine, deltaSeconds)
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if currentTimeMs > actionObject.expireTimeMs then
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close(actionObject.coroutine)
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end
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if coroutine.status(actionObject.coroutine) == "dead" then
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self.queue[id] = nil
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end
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end
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end
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