1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { Directionality } from '@angular/cdk/bidi';
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9 | import { getRtlScrollAxisType, supportsScrollBehavior, } from '@angular/cdk/platform';
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10 | import { Directive, ElementRef, NgZone, Optional } from '@angular/core';
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11 | import { fromEvent, Observable, Subject } from 'rxjs';
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12 | import { takeUntil } from 'rxjs/operators';
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13 | import { ScrollDispatcher } from './scroll-dispatcher';
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14 | import * as i0 from "@angular/core";
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15 | import * as i1 from "./scroll-dispatcher";
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16 | import * as i2 from "@angular/cdk/bidi";
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17 | /**
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18 | * Sends an event when the directive's element is scrolled. Registers itself with the
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19 | * ScrollDispatcher service to include itself as part of its collection of scrolling events that it
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20 | * can be listened to through the service.
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21 | */
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22 | export class CdkScrollable {
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23 | constructor(elementRef, scrollDispatcher, ngZone, dir) {
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24 | this.elementRef = elementRef;
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25 | this.scrollDispatcher = scrollDispatcher;
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26 | this.ngZone = ngZone;
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27 | this.dir = dir;
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28 | this._destroyed = new Subject();
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29 | this._elementScrolled = new Observable((observer) => this.ngZone.runOutsideAngular(() => fromEvent(this.elementRef.nativeElement, 'scroll')
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30 | .pipe(takeUntil(this._destroyed))
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31 | .subscribe(observer)));
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32 | }
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33 | ngOnInit() {
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34 | this.scrollDispatcher.register(this);
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35 | }
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36 | ngOnDestroy() {
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37 | this.scrollDispatcher.deregister(this);
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38 | this._destroyed.next();
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39 | this._destroyed.complete();
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40 | }
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41 | /** Returns observable that emits when a scroll event is fired on the host element. */
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42 | elementScrolled() {
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43 | return this._elementScrolled;
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44 | }
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45 | /** Gets the ElementRef for the viewport. */
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46 | getElementRef() {
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47 | return this.elementRef;
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48 | }
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49 | /**
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50 | * Scrolls to the specified offsets. This is a normalized version of the browser's native scrollTo
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51 | * method, since browsers are not consistent about what scrollLeft means in RTL. For this method
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52 | * left and right always refer to the left and right side of the scrolling container irrespective
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53 | * of the layout direction. start and end refer to left and right in an LTR context and vice-versa
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54 | * in an RTL context.
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55 | * @param options specified the offsets to scroll to.
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56 | */
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57 | scrollTo(options) {
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58 | const el = this.elementRef.nativeElement;
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59 | const isRtl = this.dir && this.dir.value == 'rtl';
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60 | // Rewrite start & end offsets as right or left offsets.
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61 | if (options.left == null) {
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62 | options.left = isRtl ? options.end : options.start;
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63 | }
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64 | if (options.right == null) {
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65 | options.right = isRtl ? options.start : options.end;
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66 | }
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67 | // Rewrite the bottom offset as a top offset.
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68 | if (options.bottom != null) {
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69 | options.top =
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70 | el.scrollHeight - el.clientHeight - options.bottom;
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71 | }
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72 | // Rewrite the right offset as a left offset.
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73 | if (isRtl && getRtlScrollAxisType() != 0 /* RtlScrollAxisType.NORMAL */) {
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74 | if (options.left != null) {
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75 | options.right =
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76 | el.scrollWidth - el.clientWidth - options.left;
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77 | }
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78 | if (getRtlScrollAxisType() == 2 /* RtlScrollAxisType.INVERTED */) {
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79 | options.left = options.right;
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80 | }
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81 | else if (getRtlScrollAxisType() == 1 /* RtlScrollAxisType.NEGATED */) {
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82 | options.left = options.right ? -options.right : options.right;
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83 | }
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84 | }
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85 | else {
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86 | if (options.right != null) {
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87 | options.left =
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88 | el.scrollWidth - el.clientWidth - options.right;
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89 | }
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90 | }
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91 | this._applyScrollToOptions(options);
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92 | }
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93 | _applyScrollToOptions(options) {
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94 | const el = this.elementRef.nativeElement;
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95 | if (supportsScrollBehavior()) {
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96 | el.scrollTo(options);
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97 | }
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98 | else {
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99 | if (options.top != null) {
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100 | el.scrollTop = options.top;
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101 | }
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102 | if (options.left != null) {
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103 | el.scrollLeft = options.left;
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104 | }
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105 | }
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106 | }
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107 | /**
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108 | * Measures the scroll offset relative to the specified edge of the viewport. This method can be
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109 | * used instead of directly checking scrollLeft or scrollTop, since browsers are not consistent
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110 | * about what scrollLeft means in RTL. The values returned by this method are normalized such that
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111 | * left and right always refer to the left and right side of the scrolling container irrespective
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112 | * of the layout direction. start and end refer to left and right in an LTR context and vice-versa
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113 | * in an RTL context.
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114 | * @param from The edge to measure from.
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115 | */
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116 | measureScrollOffset(from) {
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117 | const LEFT = 'left';
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118 | const RIGHT = 'right';
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119 | const el = this.elementRef.nativeElement;
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120 | if (from == 'top') {
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121 | return el.scrollTop;
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122 | }
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123 | if (from == 'bottom') {
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124 | return el.scrollHeight - el.clientHeight - el.scrollTop;
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125 | }
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126 | // Rewrite start & end as left or right offsets.
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127 | const isRtl = this.dir && this.dir.value == 'rtl';
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128 | if (from == 'start') {
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129 | from = isRtl ? RIGHT : LEFT;
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130 | }
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131 | else if (from == 'end') {
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132 | from = isRtl ? LEFT : RIGHT;
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133 | }
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134 | if (isRtl && getRtlScrollAxisType() == 2 /* RtlScrollAxisType.INVERTED */) {
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135 | // For INVERTED, scrollLeft is (scrollWidth - clientWidth) when scrolled all the way left and
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136 | // 0 when scrolled all the way right.
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137 | if (from == LEFT) {
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138 | return el.scrollWidth - el.clientWidth - el.scrollLeft;
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139 | }
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140 | else {
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141 | return el.scrollLeft;
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142 | }
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143 | }
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144 | else if (isRtl && getRtlScrollAxisType() == 1 /* RtlScrollAxisType.NEGATED */) {
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145 | // For NEGATED, scrollLeft is -(scrollWidth - clientWidth) when scrolled all the way left and
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146 | // 0 when scrolled all the way right.
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147 | if (from == LEFT) {
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148 | return el.scrollLeft + el.scrollWidth - el.clientWidth;
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149 | }
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150 | else {
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151 | return -el.scrollLeft;
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152 | }
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153 | }
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154 | else {
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155 | // For NORMAL, as well as non-RTL contexts, scrollLeft is 0 when scrolled all the way left and
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156 | // (scrollWidth - clientWidth) when scrolled all the way right.
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157 | if (from == LEFT) {
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158 | return el.scrollLeft;
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159 | }
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160 | else {
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161 | return el.scrollWidth - el.clientWidth - el.scrollLeft;
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162 | }
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163 | }
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164 | }
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165 | }
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166 | CdkScrollable.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: CdkScrollable, deps: [{ token: i0.ElementRef }, { token: i1.ScrollDispatcher }, { token: i0.NgZone }, { token: i2.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Directive });
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167 | CdkScrollable.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.0.1", type: CdkScrollable, selector: "[cdk-scrollable], [cdkScrollable]", ngImport: i0 });
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168 | i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: CdkScrollable, decorators: [{
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169 | type: Directive,
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170 | args: [{
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171 | selector: '[cdk-scrollable], [cdkScrollable]',
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172 | }]
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173 | }], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i1.ScrollDispatcher }, { type: i0.NgZone }, { type: i2.Directionality, decorators: [{
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174 | type: Optional
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175 | }] }]; } });
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176 | //# 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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  protected readonly _destroyed = new Subject<void>();\n\n  protected _elementScrolled: Observable<Event> = new Observable((observer: Observer<Event>) =>\n    this.ngZone.runOutsideAngular(() =>\n      fromEvent(this.elementRef.nativeElement, 'scroll')\n        .pipe(takeUntil(this._destroyed))\n        .subscribe(observer),\n    ),\n  );\n\n  constructor(\n    protected elementRef: ElementRef<HTMLElement>,\n    protected scrollDispatcher: ScrollDispatcher,\n    protected ngZone: NgZone,\n    @Optional() protected dir?: Directionality,\n  ) {}\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    if (options.left == null) {\n      options.left = isRtl ? options.end : options.start;\n    }\n\n    if (options.right == null) {\n      options.right = isRtl ? options.start : options.end;\n    }\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"]} |
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