96 lines
2.1 KiB
TypeScript
96 lines
2.1 KiB
TypeScript
import { ViewArray } from './view-array';
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import { Injectable, Inject } from 'ng-metadata/core';
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@Injectable(ViewArray.name)
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export class ViewArrayImpl implements ViewArray {
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public entries: any[];
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public isVisible: boolean;
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public visibleEntries: any[];
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public hasEntries: boolean;
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public hasHiddenEntries: boolean;
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private timerRef: any;
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private currentIndex: number;
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private additionalCount: number = 20;
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constructor(@Inject('$interval') private $interval: ng.IIntervalService) {
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this.isVisible = false;
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this.visibleEntries = null;
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this.hasEntries = false;
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this.entries = [];
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this.hasHiddenEntries = false;
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this.timerRef = null;
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this.currentIndex = 0;
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}
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public length(): number {
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return this.entries.length;
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}
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public get(index: number): any {
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return this.entries[index];
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}
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public push(elem: any): void {
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this.entries.push(elem);
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this.hasEntries = true;
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if (this.isVisible) {
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this.startTimer();
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}
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}
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public toggle(): void {
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this.setVisible(!this.isVisible);
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}
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public setVisible(newState: boolean): void {
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this.isVisible = newState;
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this.visibleEntries = [];
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this.currentIndex = 0;
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if (newState) {
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this.showAdditionalEntries();
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this.startTimer();
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}
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else {
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this.stopTimer();
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}
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}
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public create(): ViewArrayImpl {
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return new ViewArrayImpl(this.$interval);
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}
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private showAdditionalEntries(): void {
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var i: number = 0;
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for (i = this.currentIndex; i < (this.currentIndex + this.additionalCount) && i < this.entries.length; ++i) {
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this.visibleEntries.push(this.entries[i]);
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}
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this.currentIndex = i;
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this.hasHiddenEntries = this.currentIndex < this.entries.length;
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if (this.currentIndex >= this.entries.length) {
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this.stopTimer();
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}
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}
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private startTimer(): void {
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if (this.timerRef) {
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return;
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}
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this.timerRef = this.$interval(() => {
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this.showAdditionalEntries();
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}, 10);
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}
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private stopTimer(): void {
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if (this.timerRef) {
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this.$interval.cancel(this.timerRef);
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this.timerRef = null;
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}
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}
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}
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