@angular/cdk
Version:
Angular Material Component Development Kit
246 lines • 24.6 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: src/cdk/scrolling/scrollable.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Directionality } from '@angular/cdk/bidi';
import { getRtlScrollAxisType, RtlScrollAxisType, supportsScrollBehavior } from '@angular/cdk/platform';
import { Directive, ElementRef, NgZone, Optional } from '@angular/core';
import { fromEvent, Observable, Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { ScrollDispatcher } from './scroll-dispatcher';
/**
* Sends an event when the directive's element is scrolled. Registers itself with the
* ScrollDispatcher service to include itself as part of its collection of scrolling events that it
* can be listened to through the service.
*/
export class CdkScrollable {
/**
* @param {?} elementRef
* @param {?} scrollDispatcher
* @param {?} ngZone
* @param {?=} dir
*/
constructor(elementRef, scrollDispatcher, ngZone, dir) {
this.elementRef = elementRef;
this.scrollDispatcher = scrollDispatcher;
this.ngZone = ngZone;
this.dir = dir;
this._destroyed = new Subject();
this._elementScrolled = new Observable((/**
* @param {?} observer
* @return {?}
*/
(observer) => this.ngZone.runOutsideAngular((/**
* @return {?}
*/
() => fromEvent(this.elementRef.nativeElement, 'scroll').pipe(takeUntil(this._destroyed))
.subscribe(observer)))));
}
/**
* @return {?}
*/
ngOnInit() {
this.scrollDispatcher.register(this);
}
/**
* @return {?}
*/
ngOnDestroy() {
this.scrollDispatcher.deregister(this);
this._destroyed.next();
this._destroyed.complete();
}
/**
* Returns observable that emits when a scroll event is fired on the host element.
* @return {?}
*/
elementScrolled() {
return this._elementScrolled;
}
/**
* Gets the ElementRef for the viewport.
* @return {?}
*/
getElementRef() {
return this.elementRef;
}
/**
* Scrolls to the specified offsets. This is a normalized version of the browser's native scrollTo
* method, since browsers are not consistent about what scrollLeft means in RTL. For this method
* left and right always refer to the left and right side of the scrolling container irrespective
* of the layout direction. start and end refer to left and right in an LTR context and vice-versa
* in an RTL context.
* @param {?} options specified the offsets to scroll to.
* @return {?}
*/
scrollTo(options) {
/** @type {?} */
const el = this.elementRef.nativeElement;
/** @type {?} */
const isRtl = this.dir && this.dir.value == 'rtl';
// Rewrite start & end offsets as right or left offsets.
options.left = options.left == null ? (isRtl ? options.end : options.start) : options.left;
options.right = options.right == null ? (isRtl ? options.start : options.end) : options.right;
// Rewrite the bottom offset as a top offset.
if (options.bottom != null) {
((/** @type {?} */ (options))).top =
el.scrollHeight - el.clientHeight - options.bottom;
}
// Rewrite the right offset as a left offset.
if (isRtl && getRtlScrollAxisType() != RtlScrollAxisType.NORMAL) {
if (options.left != null) {
((/** @type {?} */ (options))).right =
el.scrollWidth - el.clientWidth - options.left;
}
if (getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {
options.left = options.right;
}
else if (getRtlScrollAxisType() == RtlScrollAxisType.NEGATED) {
options.left = options.right ? -options.right : options.right;
}
}
else {
if (options.right != null) {
((/** @type {?} */ (options))).left =
el.scrollWidth - el.clientWidth - options.right;
}
}
this._applyScrollToOptions(options);
}
/**
* @private
* @param {?} options
* @return {?}
*/
_applyScrollToOptions(options) {
/** @type {?} */
const el = this.elementRef.nativeElement;
if (supportsScrollBehavior()) {
el.scrollTo(options);
}
else {
if (options.top != null) {
el.scrollTop = options.top;
}
if (options.left != null) {
el.scrollLeft = options.left;
}
}
}
/**
* Measures the scroll offset relative to the specified edge of the viewport. This method can be
* used instead of directly checking scrollLeft or scrollTop, since browsers are not consistent
* about what scrollLeft means in RTL. The values returned by this method are normalized such that
* left and right always refer to the left and right side of the scrolling container irrespective
* of the layout direction. start and end refer to left and right in an LTR context and vice-versa
* in an RTL context.
* @param {?} from The edge to measure from.
* @return {?}
*/
measureScrollOffset(from) {
/** @type {?} */
const LEFT = 'left';
/** @type {?} */
const RIGHT = 'right';
/** @type {?} */
const el = this.elementRef.nativeElement;
if (from == 'top') {
return el.scrollTop;
}
if (from == 'bottom') {
return el.scrollHeight - el.clientHeight - el.scrollTop;
}
// Rewrite start & end as left or right offsets.
/** @type {?} */
const isRtl = this.dir && this.dir.value == 'rtl';
if (from == 'start') {
from = isRtl ? RIGHT : LEFT;
}
else if (from == 'end') {
from = isRtl ? LEFT : RIGHT;
}
if (isRtl && getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {
// For INVERTED, scrollLeft is (scrollWidth - clientWidth) when scrolled all the way left and
// 0 when scrolled all the way right.
if (from == LEFT) {
return el.scrollWidth - el.clientWidth - el.scrollLeft;
}
else {
return el.scrollLeft;
}
}
else if (isRtl && getRtlScrollAxisType() == RtlScrollAxisType.NEGATED) {
// For NEGATED, scrollLeft is -(scrollWidth - clientWidth) when scrolled all the way left and
// 0 when scrolled all the way right.
if (from == LEFT) {
return el.scrollLeft + el.scrollWidth - el.clientWidth;
}
else {
return -el.scrollLeft;
}
}
else {
// For NORMAL, as well as non-RTL contexts, scrollLeft is 0 when scrolled all the way left and
// (scrollWidth - clientWidth) when scrolled all the way right.
if (from == LEFT) {
return el.scrollLeft;
}
else {
return el.scrollWidth - el.clientWidth - el.scrollLeft;
}
}
}
}
CdkScrollable.decorators = [
{ type: Directive, args: [{
selector: '[cdk-scrollable], [cdkScrollable]'
},] }
];
/** @nocollapse */
CdkScrollable.ctorParameters = () => [
{ type: ElementRef },
{ type: ScrollDispatcher },
{ type: NgZone },
{ type: Directionality, decorators: [{ type: Optional }] }
];
if (false) {
/**
* @type {?}
* @private
*/
CdkScrollable.prototype._destroyed;
/**
* @type {?}
* @private
*/
CdkScrollable.prototype._elementScrolled;
/**
* @type {?}
* @protected
*/
CdkScrollable.prototype.elementRef;
/**
* @type {?}
* @protected
*/
CdkScrollable.prototype.scrollDispatcher;
/**
* @type {?}
* @protected
*/
CdkScrollable.prototype.ngZone;
/**
* @type {?}
* @protected
*/
CdkScrollable.prototype.dir;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directionality} from '@angular/cdk/bidi';\nimport {\n  getRtlScrollAxisType,\n  RtlScrollAxisType,\n  supportsScrollBehavior\n} from '@angular/cdk/platform';\nimport {Directive, ElementRef, NgZone, OnDestroy, OnInit, Optional} from '@angular/core';\nimport {fromEvent, Observable, Subject, Observer} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {ScrollDispatcher} from './scroll-dispatcher';\n\nexport type _Without<T> = {[P in keyof T]?: never};\nexport type _XOR<T, U> = (_Without<T> & U) | (_Without<U> & T);\nexport type _Top = {top?: number};\nexport type _Bottom = {bottom?: number};\nexport type _Left = {left?: number};\nexport type _Right = {right?: number};\nexport type _Start = {start?: number};\nexport type _End = {end?: number};\nexport type _XAxis = _XOR<_XOR<_Left, _Right>, _XOR<_Start, _End>>;\nexport type _YAxis = _XOR<_Top, _Bottom>;\n\n/**\n * An extended version of ScrollToOptions that allows expressing scroll offsets relative to the\n * top, bottom, left, right, start, or end of the viewport rather than just the top and left.\n * Please note: the top and bottom properties are mutually exclusive, as are the left, right,\n * start, and end properties.\n */\nexport type ExtendedScrollToOptions = _XAxis & _YAxis & ScrollOptions;\n\n/**\n * Sends an event when the directive's element is scrolled. Registers itself with the\n * ScrollDispatcher service to include itself as part of its collection of scrolling events that it\n * can be listened to through the service.\n */\n@Directive({\n  selector: '[cdk-scrollable], [cdkScrollable]'\n})\nexport class CdkScrollable implements OnInit, OnDestroy {\n  private _destroyed = new Subject();\n\n  private _elementScrolled: Observable<Event> = new Observable((observer: Observer<Event>) =>\n      this.ngZone.runOutsideAngular(() =>\n          fromEvent(this.elementRef.nativeElement, 'scroll').pipe(takeUntil(this._destroyed))\n              .subscribe(observer)));\n\n  constructor(protected elementRef: ElementRef<HTMLElement>,\n              protected scrollDispatcher: ScrollDispatcher,\n              protected ngZone: NgZone,\n              @Optional() protected dir?: Directionality) {}\n\n  ngOnInit() {\n    this.scrollDispatcher.register(this);\n  }\n\n  ngOnDestroy() {\n    this.scrollDispatcher.deregister(this);\n    this._destroyed.next();\n    this._destroyed.complete();\n  }\n\n  /** Returns observable that emits when a scroll event is fired on the host element. */\n  elementScrolled(): Observable<Event> {\n    return this._elementScrolled;\n  }\n\n  /** Gets the ElementRef for the viewport. */\n  getElementRef(): ElementRef<HTMLElement> {\n    return this.elementRef;\n  }\n\n  /**\n   * Scrolls to the specified offsets. This is a normalized version of the browser's native scrollTo\n   * method, since browsers are not consistent about what scrollLeft means in RTL. For this method\n   * left and right always refer to the left and right side of the scrolling container irrespective\n   * of the layout direction. start and end refer to left and right in an LTR context and vice-versa\n   * in an RTL context.\n   * @param options specified the offsets to scroll to.\n   */\n  scrollTo(options: ExtendedScrollToOptions): void {\n    const el = this.elementRef.nativeElement;\n    const isRtl = this.dir && this.dir.value == 'rtl';\n\n    // Rewrite start & end offsets as right or left offsets.\n    options.left = options.left == null ? (isRtl ? options.end : options.start) : options.left;\n    options.right = options.right == null ? (isRtl ? options.start : options.end) : options.right;\n\n    // Rewrite the bottom offset as a top offset.\n    if (options.bottom != null) {\n      (options as _Without<_Bottom> & _Top).top =\n          el.scrollHeight - el.clientHeight - options.bottom;\n    }\n\n    // Rewrite the right offset as a left offset.\n    if (isRtl && getRtlScrollAxisType() != RtlScrollAxisType.NORMAL) {\n      if (options.left != null) {\n        (options as _Without<_Left> & _Right).right =\n            el.scrollWidth - el.clientWidth - options.left;\n      }\n\n      if (getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {\n        options.left = options.right;\n      } else if (getRtlScrollAxisType() == RtlScrollAxisType.NEGATED) {\n        options.left = options.right ? -options.right : options.right;\n      }\n    } else {\n      if (options.right != null) {\n        (options as _Without<_Right> & _Left).left =\n            el.scrollWidth - el.clientWidth - options.right;\n      }\n    }\n\n    this._applyScrollToOptions(options);\n  }\n\n  private _applyScrollToOptions(options: ScrollToOptions): void {\n    const el = this.elementRef.nativeElement;\n\n    if (supportsScrollBehavior()) {\n      el.scrollTo(options);\n    } else {\n      if (options.top != null) {\n        el.scrollTop = options.top;\n      }\n      if (options.left != null) {\n        el.scrollLeft = options.left;\n      }\n    }\n  }\n\n  /**\n   * Measures the scroll offset relative to the specified edge of the viewport. This method can be\n   * used instead of directly checking scrollLeft or scrollTop, since browsers are not consistent\n   * about what scrollLeft means in RTL. The values returned by this method are normalized such that\n   * left and right always refer to the left and right side of the scrolling container irrespective\n   * of the layout direction. start and end refer to left and right in an LTR context and vice-versa\n   * in an RTL context.\n   * @param from The edge to measure from.\n   */\n  measureScrollOffset(from: 'top' | 'left' | 'right' | 'bottom' | 'start' | 'end'): number {\n    const LEFT = 'left';\n    const RIGHT = 'right';\n    const el = this.elementRef.nativeElement;\n    if (from == 'top') {\n      return el.scrollTop;\n    }\n    if (from == 'bottom') {\n      return el.scrollHeight - el.clientHeight - el.scrollTop;\n    }\n\n    // Rewrite start & end as left or right offsets.\n    const isRtl = this.dir && this.dir.value == 'rtl';\n    if (from == 'start') {\n      from = isRtl ? RIGHT : LEFT;\n    } else if (from == 'end') {\n      from = isRtl ? LEFT : RIGHT;\n    }\n\n    if (isRtl && getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {\n      // For INVERTED, scrollLeft is (scrollWidth - clientWidth) when scrolled all the way left and\n      // 0 when scrolled all the way right.\n      if (from == LEFT) {\n        return el.scrollWidth - el.clientWidth - el.scrollLeft;\n      } else {\n        return el.scrollLeft;\n      }\n    } else if (isRtl && getRtlScrollAxisType() == RtlScrollAxisType.NEGATED) {\n      // For NEGATED, scrollLeft is -(scrollWidth - clientWidth) when scrolled all the way left and\n      // 0 when scrolled all the way right.\n      if (from == LEFT) {\n        return el.scrollLeft + el.scrollWidth - el.clientWidth;\n      } else {\n        return -el.scrollLeft;\n      }\n    } else {\n      // For NORMAL, as well as non-RTL contexts, scrollLeft is 0 when scrolled all the way left and\n      // (scrollWidth - clientWidth) when scrolled all the way right.\n      if (from == LEFT) {\n        return el.scrollLeft;\n      } else {\n        return el.scrollWidth - el.clientWidth - el.scrollLeft;\n      }\n    }\n  }\n}\n"]}