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| export type Value<T> = | |
| ((value: (T | (current: T) -> T)?, bypassSignals: boolean?) -> T) | |
| & { | |
| changed: RBXScriptSignal<T, T>, | |
| initialValue: T, | |
| destroy: () -> (), | |
| reset: () -> (), | |
| onChange: (callback: (prev: T, next: T) -> (), runOnInit: boolean?) -> (), | |
| onReset: (() -> ())?, | |
| } | |
| local function Value<T>( | |
| value: T, | |
| api: { | |
| validate: ((value: T) -> boolean)?, | |
| }? | |
| ) | |
| local changedSignal = Instance.new("BindableEvent") | |
| local cachedValue = value | |
| local proxy: any | |
| proxy = setmetatable({ | |
| changed = changedSignal.Event, | |
| initialValue = value, | |
| onChange = function(_, callback, runOnInit) | |
| local connection = changedSignal.Event:Connect(function(...) | |
| callback(...) | |
| end) | |
| if runOnInit then | |
| callback(value, value) | |
| end | |
| return function() | |
| connection:Disconnect() | |
| end | |
| end, | |
| destroy = function() | |
| changedSignal:Destroy() | |
| changedSignal = nil :: never | |
| cachedValue = nil :: never | |
| end, | |
| reset = function() | |
| local currentValue = cachedValue | |
| cachedValue = value | |
| changedSignal:Fire(currentValue, value) | |
| if proxy.onReset then | |
| proxy.onReset() | |
| end | |
| end, | |
| onReset = nil :: () -> ()?, | |
| }, { | |
| __call = function(_, ...) | |
| if select("#", ...) == 0 then | |
| return cachedValue | |
| end | |
| local proposedValue = select(1, ...) | |
| if typeof(proposedValue) == "function" then | |
| proposedValue = proposedValue(cachedValue) | |
| end | |
| if cachedValue == proposedValue then | |
| return cachedValue | |
| end | |
| if api and api.validate and not api.validate(proposedValue) then | |
| return cachedValue | |
| end | |
| if select(2, ...) ~= false then | |
| changedSignal:Fire(cachedValue, proposedValue) | |
| end | |
| cachedValue = proposedValue | |
| return proposedValue | |
| end, | |
| }) | |
| return proxy :: Value<T> | |
| end | |
| return Value |
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| local React = require("@pkgs/React") | |
| local useEffect = React.useEffect | |
| local useState = React.useState | |
| local function useValue<T, V>(value: Value<T>): T | |
| local currentValue, setCurrentValue = useState(value()) | |
| useEffect(function() | |
| local valueChanged = value.changed:Connect(function(_, newValue) | |
| setCurrentValue(function(current) | |
| if current ~= newValue then | |
| return newValue | |
| end | |
| return current | |
| end) | |
| end) | |
| return function() | |
| valueChanged:Disconnect() | |
| end | |
| end, { value.changed } :: { any }) | |
| return currentValue | |
| end | |
| return useValue |
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