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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | 6x 6x 6x 6x 1x 1x 7x 7x 1x 7x 7x 7x 3x 2x 2x 2x 2x 3x 3x 4x 7x 1x 1x 6x | /*
* @Author: lijianzhang
* @Date: 2018-03-31 21:33:17
* @Last Modified by: lijianzhang
* @Last Modified time: 2018-08-29 23:04:37
*/
import Obersver from './observer';
import store from './store';
import { IProxyData, IClass } from './type';
import { RAW_KEY } from './constant';
export default function computed(target: any, key: string, descriptor: any) {
const computedKey = Symbol(key);
const newGet = descriptor.get;
function get(this: IProxyData | IClass) {
const self = this[RAW_KEY] || this;
if (!self[computedKey]) {
self[computedKey] = {
observers: new Set(),
preValue: null,
newGet: newGet.bind(this),
observer: null,
isShouldUpdate: false,
I };
}
const obj = self[computedKey];
if (store.currentObserver) {
obj.observers.add(store.currentObserver);
store.currentObserver.bindObservers.add(obj.observers);
}E
if (!obj.observer) {
obj.observer = new Obersver(() => {
obj.isShouldUpdate = true;
if (obj.observers.size === 0) {
obj.observer.unSubscribe();
obj.observer = null;
} else {
store.pushQueue(obj.observers);
}
}, `${target.constructor.name}.${key}`);
I
obj.preValue = obj.observer.collectDep(obj.newGet);
obj.isShouldUpdate = false;
} else if (obj.isShouldUpdate) {
obj.preValue = obj.observer.collectDep(obj.newGet);
obj.isShouldUpdate = false;
}
return obj.preValue;
}
descriptor.get = get;
return descriptor;
}
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