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import { FC, createContext, useContext, useEffect, useState } from 'react';
interface PublicDeckyGlobalComponentsState {
components: Map<string, FC>;
}
export class DeckyGlobalComponentsState {
// TODO a set would be better
private _components = new Map<string, FC>();
public eventBus = new EventTarget();
publicState(): PublicDeckyGlobalComponentsState {
return { components: this._components };
}
addComponent(path: string, component: FC) {
this._components.set(path, component);
this.notifyUpdate();
}
removeComponent(path: string) {
this._components.delete(path);
this.notifyUpdate();
}
private notifyUpdate() {
this.eventBus.dispatchEvent(new Event('update'));
}
}
interface DeckyGlobalComponentsContext extends PublicDeckyGlobalComponentsState {
addComponent(path: string, component: FC): void;
removeComponent(path: string): void;
}
const DeckyGlobalComponentsContext = createContext<DeckyGlobalComponentsContext>(null as any);
export const useDeckyGlobalComponentsState = () => useContext(DeckyGlobalComponentsContext);
interface Props {
deckyGlobalComponentsState: DeckyGlobalComponentsState;
}
export const DeckyGlobalComponentsStateContextProvider: FC<Props> = ({
children,
deckyGlobalComponentsState: deckyGlobalComponentsState,
}) => {
const [publicDeckyGlobalComponentsState, setPublicDeckyGlobalComponentsState] =
useState<PublicDeckyGlobalComponentsState>({
...deckyGlobalComponentsState.publicState(),
});
useEffect(() => {
function onUpdate() {
setPublicDeckyGlobalComponentsState({ ...deckyGlobalComponentsState.publicState() });
}
deckyGlobalComponentsState.eventBus.addEventListener('update', onUpdate);
return () => deckyGlobalComponentsState.eventBus.removeEventListener('update', onUpdate);
}, []);
const addComponent = deckyGlobalComponentsState.addComponent.bind(deckyGlobalComponentsState);
const removeComponent = deckyGlobalComponentsState.removeComponent.bind(deckyGlobalComponentsState);
return (
<DeckyGlobalComponentsContext.Provider
value={{ ...publicDeckyGlobalComponentsState, addComponent, removeComponent }}
>
{children}
</DeckyGlobalComponentsContext.Provider>
);
};
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