theme-lib
Version:
This is a simple example Angular Library published to npm.
152 lines • 12.7 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import { Directive, ContentChildren, QueryList, Input, ElementRef, Output, EventEmitter, } from '@angular/core';
import { takeWhile } from 'rxjs/operators';
import 'intersection-observer';
import { NbListItemComponent } from './list.component';
/*
* List pager directive
*
* Directive allows you to determine page of currently viewing items.
*
*/
export class NbListPageTrackerDirective {
constructor() {
this.alive = true;
/*
* Page to start counting with.
*/
this.startPage = 1;
/*
* Emits when another page become visible.
*/
this.pageChange = new EventEmitter();
this.observer = new IntersectionObserver(entries => this.checkForPageChange(entries), { threshold: 0.5 });
}
/**
* @return {?}
*/
ngAfterViewInit() {
if (this.listItems && this.listItems.length) {
this.observeItems();
}
this.listItems.changes
.pipe(takeWhile(() => this.alive))
.subscribe(() => this.observeItems());
}
/**
* @return {?}
*/
ngOnDestroy() {
this.observer.disconnect && this.observer.disconnect();
}
/**
* @private
* @return {?}
*/
observeItems() {
this.listItems.forEach(i => this.observer.observe(i.nativeElement));
}
/**
* @private
* @param {?} entries
* @return {?}
*/
checkForPageChange(entries) {
/** @type {?} */
const mostVisiblePage = this.findMostVisiblePage(entries);
if (mostVisiblePage && this.currentPage !== mostVisiblePage) {
this.currentPage = mostVisiblePage;
this.pageChange.emit(this.currentPage);
}
}
/**
* @private
* @param {?} entries
* @return {?}
*/
findMostVisiblePage(entries) {
/** @type {?} */
const intersectionRatioByPage = new Map();
for (const entry of entries) {
if (entry.intersectionRatio < 0.5) {
continue;
}
/** @type {?} */
const elementIndex = this.elementIndex(entry.target);
if (elementIndex === -1) {
continue;
}
/** @type {?} */
const page = this.startPage + Math.floor(elementIndex / this.pageSize);
/** @type {?} */
let ratio = entry.intersectionRatio;
if (intersectionRatioByPage.has(page)) {
ratio += intersectionRatioByPage.get(page);
}
intersectionRatioByPage.set(page, ratio);
}
/** @type {?} */
let maxRatio = 0;
/** @type {?} */
let mostVisiblePage;
intersectionRatioByPage.forEach((ratio, page) => {
if (ratio > maxRatio) {
maxRatio = ratio;
mostVisiblePage = page;
}
});
return mostVisiblePage;
}
/**
* @private
* @param {?} element
* @return {?}
*/
elementIndex(element) {
return element.parentElement && element.parentElement.children
? Array.from(element.parentElement.children).indexOf(element)
: -1;
}
}
NbListPageTrackerDirective.decorators = [
{ type: Directive, args: [{
selector: '[nbListPageTracker]',
},] }
];
/** @nocollapse */
NbListPageTrackerDirective.ctorParameters = () => [];
NbListPageTrackerDirective.propDecorators = {
pageSize: [{ type: Input }],
startPage: [{ type: Input }],
pageChange: [{ type: Output }],
listItems: [{ type: ContentChildren, args: [NbListItemComponent, { read: ElementRef },] }]
};
if (false) {
/**
* @type {?}
* @private
*/
NbListPageTrackerDirective.prototype.alive;
/**
* @type {?}
* @private
*/
NbListPageTrackerDirective.prototype.observer;
/**
* @type {?}
* @private
*/
NbListPageTrackerDirective.prototype.currentPage;
/** @type {?} */
NbListPageTrackerDirective.prototype.pageSize;
/** @type {?} */
NbListPageTrackerDirective.prototype.startPage;
/** @type {?} */
NbListPageTrackerDirective.prototype.pageChange;
/** @type {?} */
NbListPageTrackerDirective.prototype.listItems;
}
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{\r\n  Directive,\r\n  ContentChildren,\r\n  QueryList,\r\n  Input,\r\n  ElementRef,\r\n  AfterViewInit,\r\n  OnDestroy,\r\n  Output,\r\n  EventEmitter,\r\n} from '@angular/core';\r\nimport { takeWhile } from 'rxjs/operators';\r\nimport 'intersection-observer';\r\nimport { NbListItemComponent } from './list.component';\r\n\r\n/*\r\n * List pager directive\r\n *\r\n * Directive allows you to determine page of currently viewing items.\r\n *\r\n */\r\n@Directive({\r\n  selector: '[nbListPageTracker]',\r\n})\r\nexport class NbListPageTrackerDirective implements AfterViewInit, OnDestroy {\r\n\r\n  private alive = true;\r\n\r\n  private observer: IntersectionObserver;\r\n  private currentPage: number;\r\n\r\n  /*\r\n   * Items per page.\r\n   */\r\n  @Input()\r\n  pageSize: number;\r\n\r\n  /*\r\n   * Page to start counting with.\r\n   */\r\n  @Input()\r\n  startPage: number = 1;\r\n\r\n  /*\r\n   * Emits when another page become visible.\r\n   */\r\n  @Output()\r\n  pageChange = new EventEmitter<number>();\r\n\r\n  @ContentChildren(NbListItemComponent, { read: ElementRef })\r\n  listItems: QueryList<ElementRef>;\r\n\r\n  constructor() {\r\n    this.observer = new IntersectionObserver(\r\n      entries => this.checkForPageChange(entries),\r\n      { threshold: 0.5 },\r\n    );\r\n  }\r\n\r\n  ngAfterViewInit() {\r\n    if (this.listItems && this.listItems.length) {\r\n      this.observeItems();\r\n    }\r\n\r\n    this.listItems.changes\r\n      .pipe(takeWhile(() => this.alive))\r\n      .subscribe(() => this.observeItems());\r\n  }\r\n\r\n  ngOnDestroy() {\r\n    this.observer.disconnect && this.observer.disconnect();\r\n  }\r\n\r\n  private observeItems() {\r\n    this.listItems.forEach(i => this.observer.observe(i.nativeElement));\r\n  }\r\n\r\n  private checkForPageChange(entries: IntersectionObserverEntry[]) {\r\n    const mostVisiblePage = this.findMostVisiblePage(entries);\r\n\r\n    if (mostVisiblePage && this.currentPage !== mostVisiblePage) {\r\n      this.currentPage = mostVisiblePage;\r\n      this.pageChange.emit(this.currentPage);\r\n    }\r\n  }\r\n\r\n  private findMostVisiblePage(entries: IntersectionObserverEntry[]): number | null {\r\n    const intersectionRatioByPage = new Map<number, number>();\r\n\r\n    for (const entry of entries) {\r\n      if (entry.intersectionRatio < 0.5) {\r\n        continue;\r\n      }\r\n\r\n      const elementIndex = this.elementIndex(entry.target);\r\n      if (elementIndex === -1) {\r\n        continue;\r\n      }\r\n      const page = this.startPage + Math.floor(elementIndex / this.pageSize);\r\n\r\n      let ratio = entry.intersectionRatio;\r\n      if (intersectionRatioByPage.has(page)) {\r\n        ratio += intersectionRatioByPage.get(page);\r\n      }\r\n      intersectionRatioByPage.set(page, ratio);\r\n    }\r\n\r\n    let maxRatio = 0;\r\n    let mostVisiblePage;\r\n    intersectionRatioByPage.forEach((ratio, page) => {\r\n      if (ratio > maxRatio) {\r\n        maxRatio = ratio;\r\n        mostVisiblePage = page;\r\n      }\r\n    });\r\n\r\n    return mostVisiblePage;\r\n  }\r\n\r\n  private elementIndex(element: Element): number {\r\n    return element.parentElement && element.parentElement.children\r\n      ? Array.from(element.parentElement.children).indexOf(element)\r\n      : -1;\r\n  }\r\n}\r\n"]}