react-native-refresh-loadmore-recyclerlistview
Version:
The listview that you need and deserve. It was built for performance, uses cell recycling to achieve smooth scrolling.
58 lines • 1.9 kB
JavaScript
export default class RecycleItemPool {
constructor() {
this._recyclableObjectMap = {};
this._availabilitySet = {};
}
putRecycledObject(objectType, object) {
let objectTypeTmp = this._stringify(objectType);
const objectSet = this._getRelevantSet(objectTypeTmp);
if (!this._availabilitySet[object]) {
objectSet[object] = null;
this._availabilitySet[object] = objectTypeTmp;
}
}
getRecycledObject(objectType) {
let objectTypeTmp = this._stringify(objectType);
const objectSet = this._getRelevantSet(objectTypeTmp);
let recycledObject = null;
for (const property in objectSet) {
if (objectSet.hasOwnProperty(property)) {
recycledObject = property;
break;
}
}
if (recycledObject) {
delete objectSet[recycledObject];
delete this._availabilitySet[recycledObject];
}
return recycledObject;
}
removeFromPool(object) {
if (this._availabilitySet[object]) {
delete this._getRelevantSet(this._availabilitySet[object])[object];
delete this._availabilitySet[object];
return true;
}
return false;
}
clearAll() {
this._recyclableObjectMap = {};
this._availabilitySet = {};
}
_getRelevantSet(objectType) {
let objectSet = this._recyclableObjectMap[objectType];
if (!objectSet) {
objectSet = {};
this._recyclableObjectMap[objectType] = objectSet;
}
return objectSet;
}
_stringify(objectType) {
let objectTypeTmp = '';
if (typeof objectType === "number") {
objectTypeTmp = objectType.toString();
}
return objectTypeTmp;
}
}
//# sourceMappingURL=RecycleItemPool.js.map