hm-react-cli
Version:
Create a Huimei React project by module
82 lines (76 loc) • 2.78 kB
JavaScript
import { miniCreateClass, isFn, get } from './util';
import { Component } from './Component';
import { Renderer } from './createRenderer';
const MAX_NUMBER = 1073741823;
export function createContext(defaultValue, calculateChangedBits) {
if (calculateChangedBits == void 0) {
calculateChangedBits = null;
}
var instance = {
value: defaultValue,
subscribers: []
};
var Provider = miniCreateClass(function Provider(props) {
this.value = props.value;
getContext.subscribers = this.subscribers = [];
instance = this;
}, Component, {
componentWillUnmount: function componentWillUnmount() {
this.subscribers.length = 0;
},
UNSAFE_componentWillReceiveProps: function UNSAFE_componentWillReceiveProps(nextProps) {
if (this.props.value !== nextProps.value) {
var oldValue = this.props.value;
var newValue = nextProps.value;
var changedBits = void 0;
if (Object.is(oldValue, newValue)) {
changedBits = 0;
} else {
this.value = newValue;
changedBits = isFn(calculateChangedBits) ? calculateChangedBits(oldValue, newValue) : MAX_NUMBER;
changedBits |= 0;
if (changedBits !== 0) {
instance.subscribers.forEach(function (fiber) {
if (fiber.setState){
fiber.setState( {value: newValue} );
fiber = get(fiber);
}
Renderer.updateComponent(fiber, true);
});
}
}
}
},
render: function render() {
return this.props.children;
}
});
var Consumer = miniCreateClass(function Consumer() {
instance.subscribers.push(this);
this.observedBits = 0;
this.state = {
value: instance.value
};
}, Component, {
componentWillUnmount: function componentWillUnmount() {
var i = instance.subscribers.indexOf(this);
instance.subscribers.splice(i, 1);
},
render: function render() {
return this.props.children(getContext(get(this)));
}
});
function getContext(fiber){
while (fiber.return){
if (fiber.type == Provider){
return instance.value;
}
fiber = fiber.return;
}
return defaultValue;
}
getContext.subscribers = [];
getContext.Provider = Provider;
getContext.Consumer = Consumer;
return getContext;
}