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export class RootStateChangeEvent extends Event {
static eventType = "rootstate-change";
event:Event|string;
rootState:RootStateContainer;
controller:any;
statePath:string;
state:any;
constructor(event:Event|string, rootState:RootStateContainer,
controller:any, statePath:string, state:any) {
super(RootStateChangeEvent.eventType)
this.event = event;
this.rootState = {...rootState};
this.controller = controller;
this.statePath = statePath;
this.state = {...state};
}
};
class StatePathChangeEvent extends Event {
controller:any;
statePath:string;
state:any;
constructor(controller:any, statePath:string, state:any) {
super(statePath);
this.controller = controller;
this.statePath = statePath;
this.state = state;
}
}
type RootStateContainer = {[key:string]: any};
type StateChangeEventListener = (event:StatePathChangeEvent) => void;
type RootStateChangeEventListener = (event:RootStateChangeEvent) => void;
let rootState:RootStateContainer = {};
/**
* Class used to track root state changes
*/
export class RootState {
private static bus = new EventTarget();
private static listenerCounts:{[statePath:string]:number|undefined} = {};
static addStateChangeEventListener(statePath:string, listener:StateChangeEventListener, signal:AbortSignal) {
this.bus.addEventListener(statePath, listener as EventListener, {signal} as AddEventListenerOptions);
const count = this.listenerCounts[statePath];
this.listenerCounts[statePath] = count === undefined ? 1 : count + 1;
// delete state path when aborted
signal.addEventListener("abort", () => {
const count = this.listenerCounts[statePath]! - 1;
this.listenerCounts[statePath] = count;
if (count === 0) {
delete rootState[statePath];
}
});
}
/**
* Adds an event listener for any changes to the root state.
* @param listener
* @param signal provide a signal for removing the listener
*/
static addRootStateChangeEventListener(listener:RootStateChangeEventListener, signal?:AbortSignal) {
this.bus.addEventListener(RootStateChangeEvent.eventType,
listener as EventListener,
{signal} as AddEventListenerOptions);
}
static get<T>(name:string):T|null {
const value = rootState[name];
return value === undefined ? null : value as T;
}
static change<T>(controller:any, event:Event|string, statePath:string, state:T):true {
rootState[statePath] = state;
this.bus.dispatchEvent(new StatePathChangeEvent(controller, statePath, state));
this.bus.dispatchEvent(new RootStateChangeEvent(event, rootState, controller, statePath, state));
return true;
}
static push(state:RootStateContainer) {
rootState = state;
Object.keys(state).forEach(key =>
this.bus.dispatchEvent(new StatePathChangeEvent(null, key, rootState[key])));
}
static get current():RootStateContainer { return rootState; };
}
const stateControllerIndexedProxyHandler:ProxyHandler<StateController> = {
get: (target:StateController, property:string) => target[property],
set: (target:StateController, property:string, value:any) =>
target[property] = value
};
export class StateController implements ReactiveController {
static stateProperties:Array<string> = [];
[name:string]: any;
/** Returns the stateId property from the host element if defined */
get stateId():string|null { return this.host.stateId !== undefined ?
this.host.stateId : null };
/**
* Initializes the StateController
*/
constructor(host: LitElement) {
this.host = host;
this.abortController = new AbortController();
this.host.addController(this);
return new Proxy(this, stateControllerIndexedProxyHandler);
}
/** The element that the controller is attached to */
host: LitElement & {stateId?:string};
/** Used to signal when the host has been disconnected */
abortController:AbortController;
private get stateProperties():Array<string> {
return (this.constructor as typeof StateController).stateProperties;
}
/**
* Notifies the root state of the change and calls requestUpdate on the host.
* @param event The event responsible for the update
*/
requestUpdate(event:Event|string) {
this.stateProperties.forEach(name =>
RootState.change(this, event, this.getStateName(name), this[name]));
this.host.requestUpdate();
}
hostConnected() {
// store the stateId
this._stateId = this.stateId;
this.stateProperties.forEach(name => this.initState(name));
}
hostDisconnected() {
this.abortController.abort();
this.abortController = new AbortController();
}
refreshState(force?:boolean) {
if (force === true || this._stateId !== this.stateId) {
this.hostDisconnected();
this.hostConnected();
this.host.requestUpdate();
}
}
/** Override this method to react to state changes */
stateUpdated() {}
private _stateId:string|null = null;
private initState(name:string) {
this.syncStateValue(name);
this.addStateListeners(name);
}
private syncStateValue(name:string) {
const statePath = this.getStateName(name);
const initialState = RootState.get(statePath);
if (initialState === null) {
RootState.change(this, `Init.${this.constructor.name}("${name}")`, statePath, this[name]);
} else {
this[name] = initialState;
}
}
private addStateListeners(name:string) {
const statePath = this.getStateName(name);
RootState.addStateChangeEventListener(statePath, (event:StatePathChangeEvent) => {
if (event.controller !== this) {
this[name] = event.state;
this.stateUpdated();
this.host.requestUpdate();
}
}, this.abortController.signal);
}
private getStateName(name:string) {
const stateIdPath = this.stateId ? `.${this.stateId}` : "";
return `${this.constructor.name}${stateIdPath}.${name}`;
}
}
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