Current File : /home/ugotscom/bos_naturals/node_modules/preact/src/create-context.js
import { enqueueRender } from './component';
export let i = 0;
export function createContext(defaultValue, contextId) {
contextId = '__cC' + i++;
const context = {
_id: contextId,
_defaultValue: defaultValue,
/** @type {import('./internal').FunctionComponent} */
Consumer(props, contextValue) {
// return props.children(
// context[contextId] ? context[contextId].props.value : defaultValue
// );
return props.children(contextValue);
},
/** @type {import('./internal').FunctionComponent} */
Provider(props) {
if (!this.getChildContext) {
let subs = [];
let ctx = {};
ctx[contextId] = this;
this.getChildContext = () => ctx;
this.shouldComponentUpdate = function(_props) {
if (this.props.value !== _props.value) {
// I think the forced value propagation here was only needed when `options.debounceRendering` was being bypassed:
// https://github.com/preactjs/preact/commit/4d339fb803bea09e9f198abf38ca1bf8ea4b7771#diff-54682ce380935a717e41b8bfc54737f6R358
// In those cases though, even with the value corrected, we're double-rendering all nodes.
// It might be better to just tell folks not to use force-sync mode.
// Currently, using `useContext()` in a class component will overwrite its `this.context` value.
// subs.some(c => {
// c.context = _props.value;
// enqueueRender(c);
// });
// subs.some(c => {
// c.context[contextId] = _props.value;
// enqueueRender(c);
// });
subs.some(enqueueRender);
}
};
this.sub = c => {
subs.push(c);
let old = c.componentWillUnmount;
c.componentWillUnmount = () => {
subs.splice(subs.indexOf(c), 1);
if (old) old.call(c);
};
};
}
return props.children;
}
};
// Devtools needs access to the context object when it
// encounters a Provider. This is necessary to support
// setting `displayName` on the context object instead
// of on the component itself. See:
// https://reactjs.org/docs/context.html#contextdisplayname
return (context.Provider._contextRef = context.Consumer.contextType = context);
}
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