new-tree-system/js/store.js
Seth Trowbridge 7b1bece42b setup
2022-12-06 15:53:12 -05:00

42 lines
1008 B
JavaScript

import Preact from "preact";
/** @type {Store.State} */
export const Initial = {
People: [],
};
/** @type {Store.Reducer} */
export const Reducer = (inState, inAction) => {
const clone = { ...inState };
switch (inAction.Key) {
case "person-create": {
clone.People.push({ ...inAction.Arg, ID: new Date().getTime() });
break;
}
case "person-delete": {
for (let i = 0; i < inState.People.length; i++) {
if (inState.People[i].ID == inAction.Arg.ID) {
inState.People.splice(i, 1);
break;
}
}
}
}
return clone;
};
/** @type {Store.Context} */
const Context = Preact.createContext([Initial, (_a) => {}]);
/** @type {Store.Provider} */
export const Provider = (props) => {
const binding = Preact.useReducer(Reducer, Initial);
return Preact.createElement(Context.Provider, {
value: binding,
children: props.children,
});
};
/** @type {Store.Consumer} */
export const Consumer = () => Preact.useContext(Context);