@ngez/core
Version:
A collection of minimalistic, easy-to-use and fully customizable Angular components, directives and services
231 lines • 21.3 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import * as tslib_1 from "tslib";
import { Directive, ElementRef, Inject, PLATFORM_ID, Optional, Input, Output, EventEmitter } from "@angular/core";
import { WINDOW } from "../window/window.service";
import { DOCUMENT, isPlatformBrowser } from "@angular/common";
import { defaultConfig, defaultOffsetConfig } from "./models";
import { fromEvent, merge, of } from "rxjs";
export class NgEzInViewportDirective {
/**
* @param {?} element
* @param {?} platformId
* @param {?} window
* @param {?} document
*/
constructor(element, platformId, window, document) {
this.element = element;
this.platformId = platformId;
this.window = window;
this.document = document;
this.inViewportChange = new EventEmitter();
this.latest = {
top: false,
bottom: false,
left: false,
right: false,
all: false,
any: false
};
}
/**
* @param {?} config
* @return {?}
*/
set config(config) {
this._config = config;
}
/**
* @return {?}
*/
ngOnInit() {
if (!isPlatformBrowser(this.platformId))
return;
this.container = this.getClosestScrollableParent(this.element.nativeElement);
//Check on scroll, window resize and oninit
this.subscription = merge(fromEvent(this.isDocumentTheScrollableContainer() ? this.document : this.container, 'scroll'), fromEvent(this.window, 'resize'), of(null))
.subscribe(() => this.check());
}
/**
* @return {?}
*/
ngOnDestroy() {
if (this.subscription)
this.subscription.unsubscribe();
}
/**
* @return {?}
*/
get config() {
const _a = this._config || {}, { offset = {} } = _a, config = tslib_1.__rest(_a, ["offset"]);
return Object.assign({}, defaultConfig, config, { offset: Object.assign({}, defaultOffsetConfig, offset) });
}
/**
* @return {?}
*/
check() {
/** @type {?} */
const previous = this.latest;
/** @type {?} */
const current = this.calculateVisibility();
/** @type {?} */
const hasChanged = previous.top != current.top
|| previous.bottom != current.bottom
|| previous.left != current.left
|| previous.right != current.right;
if (hasChanged)
this.inViewportChange.emit(current);
this.latest = current;
return current;
}
/**
* @private
* @return {?}
*/
calculateVisibility() {
/** @type {?} */
const elementRect = this.element.nativeElement.getBoundingClientRect();
/** @type {?} */
const height = elementRect.height;
/** @type {?} */
const width = elementRect.width;
/** @type {?} */
const containerRect = this.container.getBoundingClientRect();
/** @type {?} */
const top = elementRect.top - (this.isDocumentTheScrollableContainer()
? 0
: containerRect.top);
/** @type {?} */
const bottom = top + height;
/** @type {?} */
const left = elementRect.left - (this.isDocumentTheScrollableContainer()
? 0
: containerRect.left);
/** @type {?} */
const right = left + width;
/** @type {?} */
const containerHeight = this.container.clientHeight || this.window.innerHeight;
/** @type {?} */
const containerWidth = this.container.clientWidth || this.window.innerWidth;
/** @type {?} */
const topInView = top + this.config.offset.top >= 0 && top <= (containerHeight + this.config.offset.top);
/** @type {?} */
const bottomInView = bottom + this.config.offset.bottom >= 0 && bottom <= (containerHeight + this.config.offset.bottom);
/** @type {?} */
const leftInView = left + this.config.offset.left >= 0 && left <= (containerWidth + this.config.offset.left);
/** @type {?} */
const rightInView = right + this.config.offset.right >= 0 && right <= (containerWidth + this.config.offset.right);
return {
top: topInView,
bottom: bottomInView,
left: leftInView && (topInView || bottomInView),
right: rightInView && (topInView || bottomInView),
any: (topInView || bottomInView) && (leftInView || rightInView),
all: topInView && bottomInView && leftInView && rightInView
};
}
/**
* @private
* @param {?} node
* @return {?}
*/
getClosestScrollableParent(node) {
return !node || node === this.document.body
? this.document.documentElement
: this.isScrollable(node)
? node
: this.getClosestScrollableParent(node.parentNode);
}
/**
* @private
* @param {?} node
* @return {?}
*/
isScrollable(node) {
/** @type {?} */
const regex = /(auto|scroll)/;
return regex.test(this.getComputedStyle(node, 'overflow') +
this.getComputedStyle(node, 'overflow-y') +
this.getComputedStyle(node, 'overflow-x'));
}
/**
* @private
* @param {?} node
* @param {?} style
* @return {?}
*/
getComputedStyle(node, style) {
return this.window.getComputedStyle(node).getPropertyValue(style);
}
/**
* @private
* @return {?}
*/
isDocumentTheScrollableContainer() {
return this.document.documentElement === this.container;
}
}
NgEzInViewportDirective.decorators = [
{ type: Directive, args: [{
selector: '[ngezInViewport]',
exportAs: 'ngezInViewport'
},] }
];
/** @nocollapse */
NgEzInViewportDirective.ctorParameters = () => [
{ type: ElementRef },
{ type: Object, decorators: [{ type: Inject, args: [PLATFORM_ID,] }] },
{ type: undefined, decorators: [{ type: Inject, args: [WINDOW,] }] },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] }
];
NgEzInViewportDirective.propDecorators = {
config: [{ type: Input }],
inViewportChange: [{ type: Output }]
};
if (false) {
/** @type {?} */
NgEzInViewportDirective.prototype.inViewportChange;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype._config;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.container;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.subscription;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.latest;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.element;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.platformId;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.window;
/**
* @type {?}
* @private
*/
NgEzInViewportDirective.prototype.document;
}
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{ \r\n    Directive, \r\n    ElementRef, \r\n    Inject, \r\n    PLATFORM_ID, \r\n    Optional, \r\n    OnInit, \r\n    Input, \r\n    TemplateRef, \r\n    OnDestroy, \r\n    Output,\r\n    EventEmitter } from \"@angular/core\";\r\nimport { WINDOW } from \"../window/window.service\";\r\nimport { DOCUMENT, isPlatformBrowser } from \"@angular/common\";\r\nimport { NgEzInViewportConfig, defaultConfig, defaultOffsetConfig, NgEzInViewportEvent } from \"./models\";\r\nimport { fromEvent, merge, Subscription, of } from \"rxjs\";\r\n\r\n@Directive({\r\n    selector: '[ngezInViewport]',\r\n    exportAs: 'ngezInViewport'\r\n})\r\nexport class NgEzInViewportDirective implements OnInit, OnDestroy{\r\n\r\n    @Input() set config(config: NgEzInViewportConfig){\r\n        this._config = config;\r\n    }\r\n\r\n    @Output() inViewportChange = new EventEmitter<NgEzInViewportEvent>();\r\n\r\n    private _config: NgEzInViewportConfig;\r\n\r\n    private container: Element;\r\n\r\n    private subscription: Subscription;\r\n\r\n    private latest: NgEzInViewportEvent = {\r\n        top: false,\r\n        bottom: false,\r\n        left: false,\r\n        right: false,\r\n        all: false,\r\n        any: false\r\n    };\r\n\r\n    constructor(\r\n        private element: ElementRef,\r\n        @Inject(PLATFORM_ID) private platformId: Object,\r\n        @Inject(WINDOW) private window: any,\r\n        @Optional() @Inject(DOCUMENT) private document: any){}\r\n\r\n    ngOnInit() {\r\n        if(!isPlatformBrowser(this.platformId)) return;\r\n\r\n        this.container = this.getClosestScrollableParent(this.element.nativeElement);\r\n        \r\n        //Check on scroll, window resize and oninit\r\n        this.subscription = merge(\r\n            fromEvent(this.isDocumentTheScrollableContainer() ? this.document : this.container, 'scroll'), \r\n            fromEvent(this.window, 'resize'),\r\n            of(null))\r\n                .subscribe(() => this.check());\r\n    }\r\n\r\n    ngOnDestroy() {\r\n        if(this.subscription)\r\n            this.subscription.unsubscribe();\r\n    }\r\n\r\n\r\n    get config(): NgEzInViewportConfig {\r\n        const { offset = {}, ...config } = this._config || {};\r\n\r\n        return { \r\n            ...defaultConfig, \r\n            ...config, \r\n            offset: {\r\n                ...defaultOffsetConfig,\r\n                ...offset\r\n            }\r\n        };\r\n    }\r\n\r\n    check(): NgEzInViewportEvent{\r\n        const previous = this.latest;\r\n        const current = this.calculateVisibility();\r\n\r\n        const hasChanged = previous.top != current.top\r\n            || previous.bottom != current.bottom\r\n            || previous.left != current.left\r\n            || previous.right != current.right;\r\n\r\n        if(hasChanged)\r\n            this.inViewportChange.emit(current);\r\n\r\n        this.latest = current;\r\n        return current;\r\n    }\r\n\r\n    private calculateVisibility(): NgEzInViewportEvent{\r\n        const elementRect = this.element.nativeElement.getBoundingClientRect();\r\n        \r\n        const height = elementRect.height;\r\n        const width =  elementRect.width;\r\n\r\n        const containerRect = this.container.getBoundingClientRect();\r\n\r\n        const top = elementRect.top - (this.isDocumentTheScrollableContainer()\r\n            ? 0\r\n            : containerRect.top);\r\n\r\n        const bottom = top + height;\r\n\r\n        const left = elementRect.left - (this.isDocumentTheScrollableContainer()\r\n            ? 0\r\n            : containerRect.left);\r\n\r\n        const right = left + width;\r\n\r\n        const containerHeight = this.container.clientHeight || this.window.innerHeight;\r\n        const containerWidth = this.container.clientWidth || this.window.innerWidth;\r\n\r\n        const topInView = top + this.config.offset.top >= 0 && top <= (containerHeight + this.config.offset.top);\r\n        const bottomInView = bottom + this.config.offset.bottom >= 0 && bottom <= (containerHeight + this.config.offset.bottom);\r\n        const leftInView = left + this.config.offset.left >= 0 && left <= (containerWidth + this.config.offset.left);\r\n        const rightInView = right + this.config.offset.right >= 0 && right <= (containerWidth + this.config.offset.right);\r\n\r\n        return {\r\n            top: topInView,\r\n            bottom: bottomInView,\r\n            left: leftInView && (topInView || bottomInView),\r\n            right: rightInView && (topInView || bottomInView),\r\n            any: (topInView || bottomInView) && (leftInView || rightInView),\r\n            all: topInView && bottomInView && leftInView && rightInView\r\n        };\r\n    }\r\n\r\n    private getClosestScrollableParent(node: Node) {\r\n        return !node || node === this.document.body\r\n            ? this.document.documentElement\r\n            : this.isScrollable(node)\r\n                ? node \r\n                : this.getClosestScrollableParent(node.parentNode);\r\n    }\r\n\r\n    private isScrollable(node: Node){\r\n        const regex = /(auto|scroll)/;\r\n        return regex.test(\r\n            this.getComputedStyle(node, 'overflow') +\r\n            this.getComputedStyle(node, 'overflow-y') +\r\n            this.getComputedStyle(node, 'overflow-x'));\r\n    }\r\n\r\n    private getComputedStyle(node: Node, style: string){\r\n        return this.window.getComputedStyle(node).getPropertyValue(style);\r\n    }\r\n\r\n    private isDocumentTheScrollableContainer(){\r\n        return this.document.documentElement === this.container;\r\n    }\r\n}"]}