mirror of
https://github.com/NativeScript/NativeScript.git
synced 2025-11-05 13:26:48 +08:00
chore: cleanup reexports
This commit is contained in:
Nathan Walker
226
nativescript-core/data/virtual-array/index.ts
Normal file
226
nativescript-core/data/virtual-array/index.ts
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@@ -0,0 +1,226 @@
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import { Observable, EventData } from "../observable";
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import { ObservableArray, ChangedData, ChangeType } from "../observable-array";
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/**
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* Event args for "itemsLoading" event.
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*/
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export interface ItemsLoading extends EventData {
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/**
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* Start index.
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*/
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index: number;
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/**
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* Number of items to load.
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*/
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count: number;
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}
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/**
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* Advanced array like class that helps loading items on demand.
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*/
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export class VirtualArray<T> extends Observable {
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/**
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* String value used when hooking to change event.
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*/
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public static changeEvent = ChangeType.Change;
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/**
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* String value used when hooking to itemsLoading event.
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*/
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public static itemsLoadingEvent = "itemsLoading";
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private _requestedIndexes: Array<number>;
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private _loadedIndexes: Array<number>;
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private _length: number;
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private _cache: {};
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constructor(length = 0) {
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super();
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this._length = length;
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this._cache = {};
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this._requestedIndexes = [];
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this._loadedIndexes = [];
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}
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/**
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* Gets or sets length for the virtual array.
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*/
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get length(): number {
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return this._length;
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}
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set length(value: number) {
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if (this._length !== value) {
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const index = this._length;
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const count = value - this._length;
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this._length = value;
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this.notify({
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eventName: ChangeType.Change,
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object: this,
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action: count > 0 ? ChangeType.Add : ChangeType.Delete,
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index: index,
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removed: new Array(count < 0 ? Math.abs(count) : 0),
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addedCount: count > 0 ? count : 0,
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});
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}
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}
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/**
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* Gets or sets load size for the virtual array.
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*/
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private _loadSize: number;
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get loadSize(): number {
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return this._loadSize;
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}
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set loadSize(value: number) {
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this._loadSize = value;
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}
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getItem(index: number): T {
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const item = this._cache[index];
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if (item === undefined) {
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if (
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index >= 0 &&
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index < this.length &&
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this._requestedIndexes.indexOf(index) < 0 &&
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this._loadedIndexes.indexOf(index) < 0
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) {
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this.requestItems(index);
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}
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}
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return item;
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}
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setItem(index: number, value: T) {
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if (this._cache[index] !== value) {
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this.load(index, [value]);
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}
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}
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/**
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* Loads items from an array starting at index.
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*/
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load(index: number, items: T[]): void {
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for (let i = 0; i < items.length; i++) {
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const itemIndex = index + i;
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this._cache[itemIndex] = items[i];
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this._requestedIndexes.splice(
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this._requestedIndexes.indexOf(itemIndex),
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1
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);
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if (this._loadedIndexes.indexOf(itemIndex) < 0) {
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this._loadedIndexes.push(itemIndex);
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}
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}
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// Remove requested but never loaded indexes.
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if (this._requestedIndexes.length > 0) {
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for (let i = 0; i < this.loadSize - items.length; i++) {
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this._requestedIndexes.splice(
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this._requestedIndexes.indexOf(index + i),
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1
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);
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}
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}
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this.notify({
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eventName: ChangeType.Change,
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object: this,
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action: ChangeType.Update,
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index: index,
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removed: new Array(items.length),
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addedCount: items.length,
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});
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}
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private requestItems(index: number): void {
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const indexesToLoad = [];
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const pageIndex =
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this._loadSize > 0
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? this._loadSize * Math.floor(index / this._loadSize)
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: index;
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let count = 0;
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let start = -1;
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for (let i = 0; i < this.loadSize; i++) {
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const itemIndex = pageIndex + i;
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if (itemIndex >= this._length) {
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break;
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}
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if (this._loadedIndexes.indexOf(itemIndex) < 0) {
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if (start < 0) {
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start = itemIndex;
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}
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indexesToLoad.push(itemIndex);
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if (this._requestedIndexes.indexOf(itemIndex) < 0) {
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this._requestedIndexes.push(itemIndex);
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}
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count++;
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} else {
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if (count > 0) {
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this.notify({
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eventName: VirtualArray.itemsLoadingEvent,
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object: this,
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index: start,
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count: count,
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});
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}
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start = -1;
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count = 0;
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}
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}
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if (start >= 0 && count > 0) {
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this.notify({
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eventName: VirtualArray.itemsLoadingEvent,
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object: this,
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index: start,
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count: count,
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});
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}
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}
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}
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export interface VirtualArray<T> {
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/**
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* A basic method signature to hook an event listener (shortcut alias to the addEventListener method).
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* @param eventNames - String corresponding to events (e.g. "propertyChange"). Optionally could be used more events separated by `,` (e.g. "propertyChange", "change").
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* @param callback - Callback function which will be executed when event is raised.
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* @param thisArg - An optional parameter which will be used as `this` context for callback execution.
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*/
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on(
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eventNames: string,
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callback: (data: EventData) => void,
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thisArg?: any
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): void;
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/**
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* Raised when still not loaded items are requested.
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*/
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on(
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event: "itemsLoading",
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callback: (args: ItemsLoading) => void,
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thisArg?: any
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): void;
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/**
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* Raised when a change occurs.
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*/
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on(
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event: "change",
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callback: (args: ChangedData<T>) => void,
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thisArg?: any
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): void;
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}
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@@ -1,5 +0,0 @@
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{
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"name": "virtual-array",
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"types": "virtual-array.d.ts",
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"main": "virtual-array"
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}
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@@ -1,77 +0,0 @@
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import { Observable, EventData } from "../observable";
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import { ObservableArray, ChangedData, ChangeType } from "../observable-array";
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/**
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* Advanced array like class that helps loading items on demand.
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*/
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export class VirtualArray<T> extends Observable {
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/**
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* String value used when hooking to change event.
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*/
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public static changeEvent: string;
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/**
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* String value used when hooking to itemsLoading event.
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*/
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public static itemsLoadingEvent: string;
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constructor(arrayLength?: number);
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/**
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* Gets or sets length for the virtual array.
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*/
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length: number;
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/**
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* Gets or sets load size for the virtual array.
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*/
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loadSize: number;
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/**
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* Returns item at specified index.
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*/
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getItem(index: number): T;
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/**
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* Sets item at specified index.
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*/
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setItem(index: number, value: T): void;
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/**
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* Loads items from an array starting at index.
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*/
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load(index: number, items: T[]): void;
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/**
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* A basic method signature to hook an event listener (shortcut alias to the addEventListener method).
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* @param eventNames - String corresponding to events (e.g. "propertyChange"). Optionally could be used more events separated by `,` (e.g. "propertyChange", "change").
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* @param callback - Callback function which will be executed when event is raised.
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* @param thisArg - An optional parameter which will be used as `this` context for callback execution.
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*/
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on(eventNames: string, callback: (data: EventData) => void, thisArg?: any);
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/**
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* Raised when still not loaded items are requested.
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*/
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on(event: "itemsLoading", callback: (args: ItemsLoading) => void, thisArg?: any);
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/**
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* Raised when a change occurs.
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*/
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on(event: "change", callback: (args: ChangedData<T>) => void, thisArg?: any);
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}
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/**
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* Event args for "itemsLoading" event.
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*/
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export interface ItemsLoading extends EventData {
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/**
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* Start index.
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*/
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index: number;
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/**
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* Number of items to load.
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*/
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count: number;
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}
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@@ -1,165 +0,0 @@
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import { Observable, EventData } from "../observable";
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import * as virtualArrayDef from ".";
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const CHANGE = "change";
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const UPDATE = "update";
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const DELETE = "delete";
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const ADD = "add";
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export class ChangeType implements virtualArrayDef.ChangeType {
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static Add = ADD;
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static Delete = DELETE;
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static Update = UPDATE;
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static Splice = CHANGE;
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}
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export class VirtualArray<T> extends Observable implements virtualArrayDef.VirtualArray<T> {
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public static changeEvent = CHANGE;
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public static itemsLoadingEvent = "itemsLoading";
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private _requestedIndexes: Array<number>;
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private _loadedIndexes: Array<number>;
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private _length: number;
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private _cache: {};
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constructor(length = 0) {
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super();
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this._length = length;
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this._cache = {};
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this._requestedIndexes = [];
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this._loadedIndexes = [];
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}
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get length(): number {
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return this._length;
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}
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set length(value: number) {
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if (this._length !== value) {
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const index = this._length;
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const count = value - this._length;
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this._length = value;
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this.notify({
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eventName: CHANGE, object: this,
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action: count > 0 ? ADD : DELETE,
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index: index,
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removed: new Array(count < 0 ? Math.abs(count) : 0),
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addedCount: count > 0 ? count : 0
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});
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}
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}
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private _loadSize: number;
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get loadSize(): number {
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return this._loadSize;
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}
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set loadSize(value: number) {
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this._loadSize = value;
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}
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getItem(index: number): T {
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const item = this._cache[index];
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if (item === undefined) {
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if (index >= 0 && index < this.length && this._requestedIndexes.indexOf(index) < 0 && this._loadedIndexes.indexOf(index) < 0) {
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this.requestItems(index);
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}
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}
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return item;
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}
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setItem(index: number, value: T) {
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if (this._cache[index] !== value) {
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this.load(index, [value]);
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}
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}
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load(index: number, items: T[]): void {
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for (let i = 0; i < items.length; i++) {
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const itemIndex = index + i;
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this._cache[itemIndex] = items[i];
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this._requestedIndexes.splice(this._requestedIndexes.indexOf(itemIndex), 1);
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if (this._loadedIndexes.indexOf(itemIndex) < 0) {
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this._loadedIndexes.push(itemIndex);
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}
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}
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// Remove requested but never loaded indexes.
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if (this._requestedIndexes.length > 0) {
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for (let i = 0; i < this.loadSize - items.length; i++) {
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this._requestedIndexes.splice(this._requestedIndexes.indexOf(index + i), 1);
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}
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}
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this.notify({
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eventName: CHANGE, object: this,
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action: UPDATE,
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index: index,
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removed: new Array(items.length),
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addedCount: items.length
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});
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}
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private requestItems(index: number): void {
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const indexesToLoad = [];
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const pageIndex = this._loadSize > 0 ? this._loadSize * Math.floor(index / this._loadSize) : index;
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let count = 0;
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let start = -1;
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for (let i = 0; i < this.loadSize; i++) {
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const itemIndex = pageIndex + i;
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if (itemIndex >= this._length) {
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break;
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}
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if (this._loadedIndexes.indexOf(itemIndex) < 0) {
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if (start < 0) {
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start = itemIndex;
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}
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indexesToLoad.push(itemIndex);
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if (this._requestedIndexes.indexOf(itemIndex) < 0) {
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this._requestedIndexes.push(itemIndex);
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}
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count++;
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} else {
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if (count > 0) {
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this.notify({
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eventName: VirtualArray.itemsLoadingEvent, object: this,
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index: start,
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count: count
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});
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}
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start = -1;
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count = 0;
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}
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}
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if (start >= 0 && count > 0) {
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this.notify({
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eventName: VirtualArray.itemsLoadingEvent, object: this,
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index: start,
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count: count
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});
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}
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}
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}
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export interface VirtualArray<T> {
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on(eventNames: string, callback: (data: EventData) => void, thisArg?: any);
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on(event: "itemsLoading", callback: (args: virtualArrayDef.ItemsLoading) => void, thisArg?: any);
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on(event: "change", callback: (args: virtualArrayDef.ChangedData<T>) => void, thisArg?: any);
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}
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