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 { assertNodeInjector } from '../render3/assert';
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9 | import { getParentInjectorLocation, NodeInjector } from '../render3/di';
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10 | import { addToViewTree, createLContainer } from '../render3/instructions/shared';
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11 | import { CONTAINER_HEADER_OFFSET, NATIVE, VIEW_REFS } from '../render3/interfaces/container';
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12 | import { isLContainer } from '../render3/interfaces/type_checks';
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13 | import { PARENT, RENDERER, T_HOST, TVIEW } from '../render3/interfaces/view';
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14 | import { assertTNodeType } from '../render3/node_assert';
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15 | import { addViewToContainer, destroyLView, detachView, getBeforeNodeForView, insertView, nativeInsertBefore, nativeNextSibling, nativeParentNode } from '../render3/node_manipulation';
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16 | import { getCurrentTNode, getLView } from '../render3/state';
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17 | import { getParentInjectorIndex, getParentInjectorView, hasParentInjector } from '../render3/util/injector_utils';
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18 | import { getNativeByTNode, unwrapRNode, viewAttachedToContainer } from '../render3/util/view_utils';
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19 | import { ViewRef as R3ViewRef } from '../render3/view_ref';
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20 | import { addToArray, removeFromArray } from '../util/array_utils';
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21 | import { assertEqual, assertGreaterThan, assertLessThan } from '../util/assert';
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22 | import { noop } from '../util/noop';
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23 | import { createElementRef } from './element_ref';
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24 | import { NgModuleRef } from './ng_module_factory';
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25 | export const SWITCH_VIEW_CONTAINER_REF_FACTORY__POST_R3__ = injectViewContainerRef;
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26 | const SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__ = noop;
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27 | const SWITCH_VIEW_CONTAINER_REF_FACTORY = SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__;
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28 | /**
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29 | * Represents a container where one or more views can be attached to a component.
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30 | *
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31 | * Can contain *host views* (created by instantiating a
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32 | * component with the `createComponent()` method), and *embedded views*
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33 | * (created by instantiating a `TemplateRef` with the `createEmbeddedView()` method).
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34 | *
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35 | * A view container instance can contain other view containers,
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36 | * creating a [view hierarchy](guide/glossary#view-tree).
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37 | *
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38 | * @see `ComponentRef`
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39 | * @see `EmbeddedViewRef`
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40 | *
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41 | * @publicApi
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42 | */
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43 | export class ViewContainerRef {
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44 | }
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45 | /**
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46 | * @internal
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47 | * @nocollapse
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48 | */
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49 | ViewContainerRef.__NG_ELEMENT_ID__ = SWITCH_VIEW_CONTAINER_REF_FACTORY;
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50 | /**
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51 | * Creates a ViewContainerRef and stores it on the injector. Or, if the ViewContainerRef
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52 | * already exists, retrieves the existing ViewContainerRef.
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53 | *
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54 | * @returns The ViewContainerRef instance to use
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55 | */
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56 | export function injectViewContainerRef() {
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57 | const previousTNode = getCurrentTNode();
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58 | return createContainerRef(previousTNode, getLView());
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59 | }
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60 | const VE_ViewContainerRef = ViewContainerRef;
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61 | const R3ViewContainerRef = class ViewContainerRef extends VE_ViewContainerRef {
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62 | constructor(_lContainer, _hostTNode, _hostLView) {
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63 | super();
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64 | this._lContainer = _lContainer;
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65 | this._hostTNode = _hostTNode;
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66 | this._hostLView = _hostLView;
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67 | }
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68 | get element() {
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69 | return createElementRef(this._hostTNode, this._hostLView);
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70 | }
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71 | get injector() {
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72 | return new NodeInjector(this._hostTNode, this._hostLView);
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73 | }
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74 | /** @deprecated No replacement */
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75 | get parentInjector() {
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76 | const parentLocation = getParentInjectorLocation(this._hostTNode, this._hostLView);
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77 | if (hasParentInjector(parentLocation)) {
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78 | const parentView = getParentInjectorView(parentLocation, this._hostLView);
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79 | const injectorIndex = getParentInjectorIndex(parentLocation);
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80 | ngDevMode && assertNodeInjector(parentView, injectorIndex);
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81 | const parentTNode = parentView[TVIEW].data[injectorIndex + 8 /* TNODE */];
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82 | return new NodeInjector(parentTNode, parentView);
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83 | }
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84 | else {
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85 | return new NodeInjector(null, this._hostLView);
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86 | }
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87 | }
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88 | clear() {
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89 | while (this.length > 0) {
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90 | this.remove(this.length - 1);
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91 | }
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92 | }
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93 | get(index) {
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94 | const viewRefs = getViewRefs(this._lContainer);
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95 | return viewRefs !== null && viewRefs[index] || null;
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96 | }
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97 | get length() {
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98 | return this._lContainer.length - CONTAINER_HEADER_OFFSET;
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99 | }
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100 | createEmbeddedView(templateRef, context, index) {
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101 | const viewRef = templateRef.createEmbeddedView(context || {});
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102 | this.insert(viewRef, index);
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103 | return viewRef;
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104 | }
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105 | createComponent(componentFactory, index, injector, projectableNodes, ngModuleRef) {
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106 | const contextInjector = injector || this.parentInjector;
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107 | if (!ngModuleRef && componentFactory.ngModule == null && contextInjector) {
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108 | // DO NOT REFACTOR. The code here used to have a `value || undefined` expression
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109 | // which seems to cause internal google apps to fail. This is documented in the
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110 | // following internal bug issue: go/b/142967802
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111 | const result = contextInjector.get(NgModuleRef, null);
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112 | if (result) {
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113 | ngModuleRef = result;
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114 | }
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115 | }
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116 | const componentRef = componentFactory.create(contextInjector, projectableNodes, undefined, ngModuleRef);
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117 | this.insert(componentRef.hostView, index);
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118 | return componentRef;
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119 | }
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120 | insert(viewRef, index) {
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121 | const lView = viewRef._lView;
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122 | const tView = lView[TVIEW];
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123 | if (ngDevMode && viewRef.destroyed) {
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124 | throw new Error('Cannot insert a destroyed View in a ViewContainer!');
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125 | }
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126 | if (viewAttachedToContainer(lView)) {
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127 | // If view is already attached, detach it first so we clean up references appropriately.
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128 | const prevIdx = this.indexOf(viewRef);
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129 | // A view might be attached either to this or a different container. The `prevIdx` for
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130 | // those cases will be:
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131 | // equal to -1 for views attached to this ViewContainerRef
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132 | // >= 0 for views attached to a different ViewContainerRef
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133 | if (prevIdx !== -1) {
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134 | this.detach(prevIdx);
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135 | }
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136 | else {
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137 | const prevLContainer = lView[PARENT];
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138 | ngDevMode &&
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139 | assertEqual(isLContainer(prevLContainer), true, 'An attached view should have its PARENT point to a container.');
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140 | // We need to re-create a R3ViewContainerRef instance since those are not stored on
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141 | // LView (nor anywhere else).
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142 | const prevVCRef = new R3ViewContainerRef(prevLContainer, prevLContainer[T_HOST], prevLContainer[PARENT]);
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143 | prevVCRef.detach(prevVCRef.indexOf(viewRef));
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144 | }
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145 | }
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146 | // Logical operation of adding `LView` to `LContainer`
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147 | const adjustedIdx = this._adjustIndex(index);
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148 | const lContainer = this._lContainer;
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149 | insertView(tView, lView, lContainer, adjustedIdx);
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150 | // Physical operation of adding the DOM nodes.
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151 | const beforeNode = getBeforeNodeForView(adjustedIdx, lContainer);
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152 | const renderer = lView[RENDERER];
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153 | const parentRNode = nativeParentNode(renderer, lContainer[NATIVE]);
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154 | if (parentRNode !== null) {
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155 | addViewToContainer(tView, lContainer[T_HOST], renderer, lView, parentRNode, beforeNode);
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156 | }
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157 | viewRef.attachToViewContainerRef();
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158 | addToArray(getOrCreateViewRefs(lContainer), adjustedIdx, viewRef);
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159 | return viewRef;
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160 | }
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161 | move(viewRef, newIndex) {
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162 | if (ngDevMode && viewRef.destroyed) {
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163 | throw new Error('Cannot move a destroyed View in a ViewContainer!');
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164 | }
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165 | return this.insert(viewRef, newIndex);
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166 | }
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167 | indexOf(viewRef) {
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168 | const viewRefsArr = getViewRefs(this._lContainer);
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169 | return viewRefsArr !== null ? viewRefsArr.indexOf(viewRef) : -1;
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170 | }
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171 | remove(index) {
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172 | const adjustedIdx = this._adjustIndex(index, -1);
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173 | const detachedView = detachView(this._lContainer, adjustedIdx);
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174 | if (detachedView) {
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175 | // Before destroying the view, remove it from the container's array of `ViewRef`s.
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176 | // This ensures the view container length is updated before calling
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177 | // `destroyLView`, which could recursively call view container methods that
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178 | // rely on an accurate container length.
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179 | // (e.g. a method on this view container being called by a child directive's OnDestroy
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180 | // lifecycle hook)
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181 | removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx);
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182 | destroyLView(detachedView[TVIEW], detachedView);
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183 | }
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184 | }
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185 | detach(index) {
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186 | const adjustedIdx = this._adjustIndex(index, -1);
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187 | const view = detachView(this._lContainer, adjustedIdx);
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188 | const wasDetached = view && removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx) != null;
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189 | return wasDetached ? new R3ViewRef(view) : null;
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190 | }
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191 | _adjustIndex(index, shift = 0) {
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192 | if (index == null) {
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193 | return this.length + shift;
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194 | }
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195 | if (ngDevMode) {
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196 | assertGreaterThan(index, -1, `ViewRef index must be positive, got ${index}`);
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197 | // +1 because it's legal to insert at the end.
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198 | assertLessThan(index, this.length + 1 + shift, 'index');
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199 | }
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200 | return index;
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201 | }
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202 | };
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203 | function getViewRefs(lContainer) {
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204 | return lContainer[VIEW_REFS];
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205 | }
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206 | function getOrCreateViewRefs(lContainer) {
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207 | return (lContainer[VIEW_REFS] || (lContainer[VIEW_REFS] = []));
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208 | }
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209 | /**
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210 | * Creates a ViewContainerRef and stores it on the injector.
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211 | *
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212 | * @param ViewContainerRefToken The ViewContainerRef type
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213 | * @param ElementRefToken The ElementRef type
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214 | * @param hostTNode The node that is requesting a ViewContainerRef
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215 | * @param hostLView The view to which the node belongs
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216 | * @returns The ViewContainerRef instance to use
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217 | */
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218 | export function createContainerRef(hostTNode, hostLView) {
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219 | ngDevMode && assertTNodeType(hostTNode, 12 /* AnyContainer */ | 3 /* AnyRNode */);
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220 | let lContainer;
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221 | const slotValue = hostLView[hostTNode.index];
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222 | if (isLContainer(slotValue)) {
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223 | // If the host is a container, we don't need to create a new LContainer
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224 | lContainer = slotValue;
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225 | }
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226 | else {
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227 | let commentNode;
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228 | // If the host is an element container, the native host element is guaranteed to be a
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229 | // comment and we can reuse that comment as anchor element for the new LContainer.
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230 | // The comment node in question is already part of the DOM structure so we don't need to append
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231 | // it again.
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232 | if (hostTNode.type & 8 /* ElementContainer */) {
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233 | commentNode = unwrapRNode(slotValue);
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234 | }
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235 | else {
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236 | // If the host is a regular element, we have to insert a comment node manually which will
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237 | // be used as an anchor when inserting elements. In this specific case we use low-level DOM
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238 | // manipulation to insert it.
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239 | const renderer = hostLView[RENDERER];
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240 | ngDevMode && ngDevMode.rendererCreateComment++;
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241 | commentNode = renderer.createComment(ngDevMode ? 'container' : '');
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242 | const hostNative = getNativeByTNode(hostTNode, hostLView);
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243 | const parentOfHostNative = nativeParentNode(renderer, hostNative);
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244 | nativeInsertBefore(renderer, parentOfHostNative, commentNode, nativeNextSibling(renderer, hostNative), false);
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245 | }
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246 | hostLView[hostTNode.index] = lContainer =
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247 | createLContainer(slotValue, hostLView, commentNode, hostTNode);
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248 | addToViewTree(hostLView, lContainer);
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249 | }
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250 | return new R3ViewContainerRef(lContainer, hostTNode, hostLView);
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251 | }
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252 | //# 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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 {Injector} from '../di/injector';\nimport {assertNodeInjector} from '../render3/assert';\nimport {getParentInjectorLocation, NodeInjector} from '../render3/di';\nimport {addToViewTree, createLContainer} from '../render3/instructions/shared';\nimport {CONTAINER_HEADER_OFFSET, LContainer, NATIVE, VIEW_REFS} from '../render3/interfaces/container';\nimport {NodeInjectorOffset} from '../render3/interfaces/injector';\nimport {TContainerNode, TDirectiveHostNode, TElementContainerNode, TElementNode, TNodeType} from '../render3/interfaces/node';\nimport {RComment, RElement} from '../render3/interfaces/renderer_dom';\nimport {isLContainer} from '../render3/interfaces/type_checks';\nimport {LView, PARENT, RENDERER, T_HOST, TVIEW} from '../render3/interfaces/view';\nimport {assertTNodeType} from '../render3/node_assert';\nimport {addViewToContainer, destroyLView, detachView, getBeforeNodeForView, insertView, nativeInsertBefore, nativeNextSibling, nativeParentNode} from '../render3/node_manipulation';\nimport {getCurrentTNode, getLView} from '../render3/state';\nimport {getParentInjectorIndex, getParentInjectorView, hasParentInjector} from '../render3/util/injector_utils';\nimport {getNativeByTNode, unwrapRNode, viewAttachedToContainer} from '../render3/util/view_utils';\nimport {ViewRef as R3ViewRef} from '../render3/view_ref';\nimport {addToArray, removeFromArray} from '../util/array_utils';\nimport {assertEqual, assertGreaterThan, assertLessThan} from '../util/assert';\nimport {noop} from '../util/noop';\nimport {ComponentFactory, ComponentRef} from './component_factory';\nimport {createElementRef, ElementRef} from './element_ref';\nimport {NgModuleRef} from './ng_module_factory';\nimport {TemplateRef} from './template_ref';\nimport {EmbeddedViewRef, ViewRef} from './view_ref';\n\n\nexport const SWITCH_VIEW_CONTAINER_REF_FACTORY__POST_R3__ = injectViewContainerRef;\nconst SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__ = noop as typeof injectViewContainerRef;\nconst SWITCH_VIEW_CONTAINER_REF_FACTORY: typeof injectViewContainerRef =\n    SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__;\n\n/**\n * Represents a container where one or more views can be attached to a component.\n *\n * Can contain *host views* (created by instantiating a\n * component with the `createComponent()` method), and *embedded views*\n * (created by instantiating a `TemplateRef` with the `createEmbeddedView()` method).\n *\n * A view container instance can contain other view containers,\n * creating a [view hierarchy](guide/glossary#view-tree).\n *\n * @see `ComponentRef`\n * @see `EmbeddedViewRef`\n *\n * @publicApi\n */\nexport abstract class ViewContainerRef {\n  /**\n   * Anchor element that specifies the location of this container in the containing view.\n   * Each view container can have only one anchor element, and each anchor element\n   * can have only a single view container.\n   *\n   * Root elements of views attached to this container become siblings of the anchor element in\n   * the rendered view.\n   *\n   * Access the `ViewContainerRef` of an element by placing a `Directive` injected\n   * with `ViewContainerRef` on the element, or use a `ViewChild` query.\n   *\n   * <!-- TODO: rename to anchorElement -->\n   */\n  abstract get element(): ElementRef;\n\n  /**\n   * The [dependency injector](guide/glossary#injector) for this view container.\n   */\n  abstract get injector(): Injector;\n\n  /** @deprecated No replacement */\n  abstract get parentInjector(): Injector;\n\n  /**\n   * Destroys all views in this container.\n   */\n  abstract clear(): void;\n\n  /**\n   * Retrieves a view from this container.\n   * @param index The 0-based index of the view to retrieve.\n   * @returns The `ViewRef` instance, or null if the index is out of range.\n   */\n  abstract get(index: number): ViewRef|null;\n\n  /**\n   * Reports how many views are currently attached to this container.\n   * @returns The number of views.\n   */\n  abstract get length(): number;\n\n  /**\n   * Instantiates an embedded view and inserts it\n   * into this container.\n   * @param templateRef The HTML template that defines the view.\n   * @param context The data-binding context of the embedded view, as declared\n   * in the `<ng-template>` usage.\n   * @param index The 0-based index at which to insert the new view into this container.\n   * If not specified, appends the new view as the last entry.\n   *\n   * @returns The `ViewRef` instance for the newly created view.\n   */\n  abstract createEmbeddedView<C>(templateRef: TemplateRef<C>, context?: C, index?: number):\n      EmbeddedViewRef<C>;\n\n  /**\n   * Instantiates a single component and inserts its host view into this container.\n   *\n   * @param componentFactory The factory to use.\n   * @param index The index at which to insert the new component's host view into this container.\n   * If not specified, appends the new view as the last entry.\n   * @param injector The injector to use as the parent for the new component.\n   * @param projectableNodes\n   * @param ngModule\n   *\n   * @returns The new component instance, containing the host view.\n   *\n   */\n  abstract createComponent<C>(\n      componentFactory: ComponentFactory<C>, index?: number, injector?: Injector,\n      projectableNodes?: any[][], ngModule?: NgModuleRef<any>): ComponentRef<C>;\n\n  /**\n   * Inserts a view into this container.\n   * @param viewRef The view to insert.\n   * @param index The 0-based index at which to insert the view.\n   * If not specified, appends the new view as the last entry.\n   * @returns The inserted `ViewRef` instance.\n   *\n   */\n  abstract insert(viewRef: ViewRef, index?: number): ViewRef;\n\n  /**\n   * Moves a view to a new location in this container.\n   * @param viewRef The view to move.\n   * @param index The 0-based index of the new location.\n   * @returns The moved `ViewRef` instance.\n   */\n  abstract move(viewRef: ViewRef, currentIndex: number): ViewRef;\n\n  /**\n   * Returns the index of a view within the current container.\n   * @param viewRef The view to query.\n   * @returns The 0-based index of the view's position in this container,\n   * or `-1` if this container doesn't contain the view.\n   */\n  abstract indexOf(viewRef: ViewRef): number;\n\n  /**\n   * Destroys a view attached to this container\n   * @param index The 0-based index of the view to destroy.\n   * If not specified, the last view in the container is removed.\n   */\n  abstract remove(index?: number): void;\n\n  /**\n   * Detaches a view from this container without destroying it.\n   * Use along with `insert()` to move a view within the current container.\n   * @param index The 0-based index of the view to detach.\n   * If not specified, the last view in the container is detached.\n   */\n  abstract detach(index?: number): ViewRef|null;\n\n  /**\n   * @internal\n   * @nocollapse\n   */\n  static __NG_ELEMENT_ID__: () => ViewContainerRef = SWITCH_VIEW_CONTAINER_REF_FACTORY;\n}\n\n/**\n * Creates a ViewContainerRef and stores it on the injector. Or, if the ViewContainerRef\n * already exists, retrieves the existing ViewContainerRef.\n *\n * @returns The ViewContainerRef instance to use\n */\nexport function injectViewContainerRef(): ViewContainerRef {\n  const previousTNode = getCurrentTNode() as TElementNode | TElementContainerNode | TContainerNode;\n  return createContainerRef(previousTNode, getLView());\n}\n\nconst VE_ViewContainerRef = ViewContainerRef;\n\nconst R3ViewContainerRef = class ViewContainerRef extends VE_ViewContainerRef {\n  constructor(\n      private _lContainer: LContainer,\n      private _hostTNode: TElementNode|TContainerNode|TElementContainerNode,\n      private _hostLView: LView) {\n    super();\n  }\n\n  override get element(): ElementRef {\n    return createElementRef(this._hostTNode, this._hostLView);\n  }\n\n  override get injector(): Injector {\n    return new NodeInjector(this._hostTNode, this._hostLView);\n  }\n\n  /** @deprecated No replacement */\n  override get parentInjector(): Injector {\n    const parentLocation = getParentInjectorLocation(this._hostTNode, this._hostLView);\n    if (hasParentInjector(parentLocation)) {\n      const parentView = getParentInjectorView(parentLocation, this._hostLView);\n      const injectorIndex = getParentInjectorIndex(parentLocation);\n      ngDevMode && assertNodeInjector(parentView, injectorIndex);\n      const parentTNode =\n          parentView[TVIEW].data[injectorIndex + NodeInjectorOffset.TNODE] as TElementNode;\n      return new NodeInjector(parentTNode, parentView);\n    } else {\n      return new NodeInjector(null, this._hostLView);\n    }\n  }\n\n  override clear(): void {\n    while (this.length > 0) {\n      this.remove(this.length - 1);\n    }\n  }\n\n  override get(index: number): ViewRef|null {\n    const viewRefs = getViewRefs(this._lContainer);\n    return viewRefs !== null && viewRefs[index] || null;\n  }\n\n  override get length(): number {\n    return this._lContainer.length - CONTAINER_HEADER_OFFSET;\n  }\n\n  override createEmbeddedView<C>(templateRef: TemplateRef<C>, context?: C, index?: number):\n      EmbeddedViewRef<C> {\n    const viewRef = templateRef.createEmbeddedView(context || <any>{});\n    this.insert(viewRef, index);\n    return viewRef;\n  }\n\n  override createComponent<C>(\n      componentFactory: ComponentFactory<C>, index?: number|undefined,\n      injector?: Injector|undefined, projectableNodes?: any[][]|undefined,\n      ngModuleRef?: NgModuleRef<any>|undefined): ComponentRef<C> {\n    const contextInjector = injector || this.parentInjector;\n    if (!ngModuleRef && (componentFactory as any).ngModule == null && contextInjector) {\n      // DO NOT REFACTOR. The code here used to have a `value || undefined` expression\n      // which seems to cause internal google apps to fail. This is documented in the\n      // following internal bug issue: go/b/142967802\n      const result = contextInjector.get(NgModuleRef, null);\n      if (result) {\n        ngModuleRef = result;\n      }\n    }\n\n    const componentRef =\n        componentFactory.create(contextInjector, projectableNodes, undefined, ngModuleRef);\n    this.insert(componentRef.hostView, index);\n    return componentRef;\n  }\n\n  override insert(viewRef: ViewRef, index?: number): ViewRef {\n    const lView = (viewRef as R3ViewRef<any>)._lView!;\n    const tView = lView[TVIEW];\n\n    if (ngDevMode && viewRef.destroyed) {\n      throw new Error('Cannot insert a destroyed View in a ViewContainer!');\n    }\n\n    if (viewAttachedToContainer(lView)) {\n      // If view is already attached, detach it first so we clean up references appropriately.\n\n      const prevIdx = this.indexOf(viewRef);\n\n      // A view might be attached either to this or a different container. The `prevIdx` for\n      // those cases will be:\n      // equal to -1 for views attached to this ViewContainerRef\n      // >= 0 for views attached to a different ViewContainerRef\n      if (prevIdx !== -1) {\n        this.detach(prevIdx);\n      } else {\n        const prevLContainer = lView[PARENT] as LContainer;\n        ngDevMode &&\n            assertEqual(\n                isLContainer(prevLContainer), true,\n                'An attached view should have its PARENT point to a container.');\n\n\n        // We need to re-create a R3ViewContainerRef instance since those are not stored on\n        // LView (nor anywhere else).\n        const prevVCRef = new R3ViewContainerRef(\n            prevLContainer, prevLContainer[T_HOST] as TDirectiveHostNode, prevLContainer[PARENT]);\n\n        prevVCRef.detach(prevVCRef.indexOf(viewRef));\n      }\n    }\n\n    // Logical operation of adding `LView` to `LContainer`\n    const adjustedIdx = this._adjustIndex(index);\n    const lContainer = this._lContainer;\n    insertView(tView, lView, lContainer, adjustedIdx);\n\n    // Physical operation of adding the DOM nodes.\n    const beforeNode = getBeforeNodeForView(adjustedIdx, lContainer);\n    const renderer = lView[RENDERER];\n    const parentRNode = nativeParentNode(renderer, lContainer[NATIVE] as RElement | RComment);\n    if (parentRNode !== null) {\n      addViewToContainer(tView, lContainer[T_HOST], renderer, lView, parentRNode, beforeNode);\n    }\n\n    (viewRef as R3ViewRef<any>).attachToViewContainerRef();\n    addToArray(getOrCreateViewRefs(lContainer), adjustedIdx, viewRef);\n\n    return viewRef;\n  }\n\n  override move(viewRef: ViewRef, newIndex: number): ViewRef {\n    if (ngDevMode && viewRef.destroyed) {\n      throw new Error('Cannot move a destroyed View in a ViewContainer!');\n    }\n    return this.insert(viewRef, newIndex);\n  }\n\n  override indexOf(viewRef: ViewRef): number {\n    const viewRefsArr = getViewRefs(this._lContainer);\n    return viewRefsArr !== null ? viewRefsArr.indexOf(viewRef) : -1;\n  }\n\n  override remove(index?: number): void {\n    const adjustedIdx = this._adjustIndex(index, -1);\n    const detachedView = detachView(this._lContainer, adjustedIdx);\n\n    if (detachedView) {\n      // Before destroying the view, remove it from the container's array of `ViewRef`s.\n      // This ensures the view container length is updated before calling\n      // `destroyLView`, which could recursively call view container methods that\n      // rely on an accurate container length.\n      // (e.g. a method on this view container being called by a child directive's OnDestroy\n      // lifecycle hook)\n      removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx);\n      destroyLView(detachedView[TVIEW], detachedView);\n    }\n  }\n\n  override detach(index?: number): ViewRef|null {\n    const adjustedIdx = this._adjustIndex(index, -1);\n    const view = detachView(this._lContainer, adjustedIdx);\n\n    const wasDetached =\n        view && removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx) != null;\n    return wasDetached ? new R3ViewRef(view!) : null;\n  }\n\n  private _adjustIndex(index?: number, shift: number = 0) {\n    if (index == null) {\n      return this.length + shift;\n    }\n    if (ngDevMode) {\n      assertGreaterThan(index, -1, `ViewRef index must be positive, got ${index}`);\n      // +1 because it's legal to insert at the end.\n      assertLessThan(index, this.length + 1 + shift, 'index');\n    }\n    return index;\n  }\n};\n\nfunction getViewRefs(lContainer: LContainer): ViewRef[]|null {\n  return lContainer[VIEW_REFS] as ViewRef[];\n}\n\nfunction getOrCreateViewRefs(lContainer: LContainer): ViewRef[] {\n  return (lContainer[VIEW_REFS] || (lContainer[VIEW_REFS] = [])) as ViewRef[];\n}\n\n/**\n * Creates a ViewContainerRef and stores it on the injector.\n *\n * @param ViewContainerRefToken The ViewContainerRef type\n * @param ElementRefToken The ElementRef type\n * @param hostTNode The node that is requesting a ViewContainerRef\n * @param hostLView The view to which the node belongs\n * @returns The ViewContainerRef instance to use\n */\nexport function createContainerRef(\n    hostTNode: TElementNode|TContainerNode|TElementContainerNode,\n    hostLView: LView): ViewContainerRef {\n  ngDevMode && assertTNodeType(hostTNode, TNodeType.AnyContainer | TNodeType.AnyRNode);\n\n  let lContainer: LContainer;\n  const slotValue = hostLView[hostTNode.index];\n  if (isLContainer(slotValue)) {\n    // If the host is a container, we don't need to create a new LContainer\n    lContainer = slotValue;\n  } else {\n    let commentNode: RComment;\n    // If the host is an element container, the native host element is guaranteed to be a\n    // comment and we can reuse that comment as anchor element for the new LContainer.\n    // The comment node in question is already part of the DOM structure so we don't need to append\n    // it again.\n    if (hostTNode.type & TNodeType.ElementContainer) {\n      commentNode = unwrapRNode(slotValue) as RComment;\n    } else {\n      // If the host is a regular element, we have to insert a comment node manually which will\n      // be used as an anchor when inserting elements. In this specific case we use low-level DOM\n      // manipulation to insert it.\n      const renderer = hostLView[RENDERER];\n      ngDevMode && ngDevMode.rendererCreateComment++;\n      commentNode = renderer.createComment(ngDevMode ? 'container' : '');\n\n      const hostNative = getNativeByTNode(hostTNode, hostLView)!;\n      const parentOfHostNative = nativeParentNode(renderer, hostNative);\n      nativeInsertBefore(\n          renderer, parentOfHostNative!, commentNode, nativeNextSibling(renderer, hostNative),\n          false);\n    }\n\n    hostLView[hostTNode.index] = lContainer =\n        createLContainer(slotValue, hostLView, commentNode, hostTNode);\n\n    addToViewTree(hostLView, lContainer);\n  }\n\n  return new R3ViewContainerRef(lContainer, hostTNode, hostLView);\n}\n"]} |
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