[6a3a178] | 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 { isComponentHost } from '../render3/interfaces/type_checks';
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| 9 | import { DECLARATION_COMPONENT_VIEW } from '../render3/interfaces/view';
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| 10 | import { getCurrentTNode, getLView } from '../render3/state';
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| 11 | import { getComponentLViewByIndex } from '../render3/util/view_utils';
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| 12 | import { ViewRef as R3_ViewRef } from '../render3/view_ref';
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| 13 | import { noop } from '../util/noop';
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| 14 | export const SWITCH_CHANGE_DETECTOR_REF_FACTORY__POST_R3__ = injectChangeDetectorRef;
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| 15 | const SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__ = noop;
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| 16 | const SWITCH_CHANGE_DETECTOR_REF_FACTORY = SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__;
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| 17 | /**
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| 18 | * Base class that provides change detection functionality.
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| 19 | * A change-detection tree collects all views that are to be checked for changes.
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| 20 | * Use the methods to add and remove views from the tree, initiate change-detection,
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| 21 | * and explicitly mark views as _dirty_, meaning that they have changed and need to be re-rendered.
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| 22 | *
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| 23 | * @see [Using change detection hooks](guide/lifecycle-hooks#using-change-detection-hooks)
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| 24 | * @see [Defining custom change detection](guide/lifecycle-hooks#defining-custom-change-detection)
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| 25 | *
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| 26 | * @usageNotes
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| 27 | *
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| 28 | * The following examples demonstrate how to modify default change-detection behavior
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| 29 | * to perform explicit detection when needed.
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| 30 | *
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| 31 | * ### Use `markForCheck()` with `CheckOnce` strategy
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| 32 | *
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| 33 | * The following example sets the `OnPush` change-detection strategy for a component
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| 34 | * (`CheckOnce`, rather than the default `CheckAlways`), then forces a second check
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| 35 | * after an interval. See [live demo](https://plnkr.co/edit/GC512b?p=preview).
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| 36 | *
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| 37 | * <code-example path="core/ts/change_detect/change-detection.ts"
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| 38 | * region="mark-for-check"></code-example>
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| 39 | *
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| 40 | * ### Detach change detector to limit how often check occurs
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| 41 | *
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| 42 | * The following example defines a component with a large list of read-only data
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| 43 | * that is expected to change constantly, many times per second.
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| 44 | * To improve performance, we want to check and update the list
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| 45 | * less often than the changes actually occur. To do that, we detach
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| 46 | * the component's change detector and perform an explicit local check every five seconds.
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| 47 | *
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| 48 | * <code-example path="core/ts/change_detect/change-detection.ts" region="detach"></code-example>
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| 49 | *
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| 50 | *
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| 51 | * ### Reattaching a detached component
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| 52 | *
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| 53 | * The following example creates a component displaying live data.
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| 54 | * The component detaches its change detector from the main change detector tree
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| 55 | * when the `live` property is set to false, and reattaches it when the property
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| 56 | * becomes true.
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| 57 | *
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| 58 | * <code-example path="core/ts/change_detect/change-detection.ts" region="reattach"></code-example>
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| 59 | *
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| 60 | * @publicApi
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| 61 | */
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| 62 | export class ChangeDetectorRef {
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| 63 | }
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| 64 | /**
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| 65 | * @internal
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| 66 | * @nocollapse
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| 67 | */
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| 68 | ChangeDetectorRef.__NG_ELEMENT_ID__ = SWITCH_CHANGE_DETECTOR_REF_FACTORY;
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| 69 | /** Returns a ChangeDetectorRef (a.k.a. a ViewRef) */
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| 70 | export function injectChangeDetectorRef(flags) {
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| 71 | return createViewRef(getCurrentTNode(), getLView(), (flags & 16 /* ForPipe */) === 16 /* ForPipe */);
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| 72 | }
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| 73 | /**
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| 74 | * Creates a ViewRef and stores it on the injector as ChangeDetectorRef (public alias).
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| 75 | *
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| 76 | * @param tNode The node that is requesting a ChangeDetectorRef
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| 77 | * @param lView The view to which the node belongs
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| 78 | * @param isPipe Whether the view is being injected into a pipe.
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| 79 | * @returns The ChangeDetectorRef to use
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| 80 | */
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| 81 | function createViewRef(tNode, lView, isPipe) {
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| 82 | if (isComponentHost(tNode) && !isPipe) {
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| 83 | // The LView represents the location where the component is declared.
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| 84 | // Instead we want the LView for the component View and so we need to look it up.
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| 85 | const componentView = getComponentLViewByIndex(tNode.index, lView); // look down
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| 86 | return new R3_ViewRef(componentView, componentView);
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| 87 | }
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| 88 | else if (tNode.type & (3 /* AnyRNode */ | 12 /* AnyContainer */ | 32 /* Icu */)) {
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| 89 | // The LView represents the location where the injection is requested from.
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| 90 | // We need to locate the containing LView (in case where the `lView` is an embedded view)
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| 91 | const hostComponentView = lView[DECLARATION_COMPONENT_VIEW]; // look up
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| 92 | return new R3_ViewRef(hostComponentView, lView);
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| 93 | }
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| 94 | return null;
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| 95 | }
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| 96 | //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"change_detector_ref.js","sourceRoot":"","sources":["../../../../../../../packages/core/src/change_detection/change_detector_ref.ts"],"names":[],"mappings":"AAAA;;;;;;GAMG;AAKH,OAAO,EAAC,eAAe,EAAC,MAAM,mCAAmC,CAAC;AAClE,OAAO,EAAC,0BAA0B,EAAQ,MAAM,4BAA4B,CAAC;AAC7E,OAAO,EAAC,eAAe,EAAE,QAAQ,EAAC,MAAM,kBAAkB,CAAC;AAC3D,OAAO,EAAC,wBAAwB,EAAC,MAAM,4BAA4B,CAAC;AACpE,OAAO,EAAC,OAAO,IAAI,UAAU,EAAC,MAAM,qBAAqB,CAAC;AAC1D,OAAO,EAAC,IAAI,EAAC,MAAM,cAAc,CAAC;AAElC,MAAM,CAAC,MAAM,6CAA6C,GAAG,uBAAuB,CAAC;AACrF,MAAM,4CAA4C,GAAG,IAAI,CAAC;AAC1D,MAAM,kCAAkC,GACpC,4CAA4C,CAAC;AAEjD;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA4CG;AACH,MAAM,OAAgB,iBAAiB;;AAyDrC;;;GAGG;AACI,mCAAiB,GACwB,kCAAkC,CAAC;AAKrF,qDAAqD;AACrD,MAAM,UAAU,uBAAuB,CAAC,KAAkB;IACxD,OAAO,aAAa,CAChB,eAAe,EAAG,EAAE,QAAQ,EAAE,EAC9B,CAAC,KAAK,mBAA8B,CAAC,qBAAgC,CAAC,CAAC;AAC7E,CAAC;AAED;;;;;;;GAOG;AACH,SAAS,aAAa,CAAC,KAAY,EAAE,KAAY,EAAE,MAAe;IAChE,IAAI,eAAe,CAAC,KAAK,CAAC,IAAI,CAAC,MAAM,EAAE;QACrC,qEAAqE;QACrE,iFAAiF;QACjF,MAAM,aAAa,GAAG,wBAAwB,CAAC,KAAK,CAAC,KAAK,EAAE,KAAK,CAAC,CAAC,CAAE,YAAY;QACjF,OAAO,IAAI,UAAU,CAAC,aAAa,EAAE,aAAa,CAAC,CAAC;KACrD;SAAM,IAAI,KAAK,CAAC,IAAI,GAAG,CAAC,wCAA2C,eAAgB,CAAC,EAAE;QACrF,2EAA2E;QAC3E,yFAAyF;QACzF,MAAM,iBAAiB,GAAG,KAAK,CAAC,0BAA0B,CAAC,CAAC,CAAE,UAAU;QACxE,OAAO,IAAI,UAAU,CAAC,iBAAiB,EAAE,KAAK,CAAC,CAAC;KACjD;IACD,OAAO,IAAK,CAAC;AACf,CAAC","sourcesContent":["/**\n * @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 {InjectFlags} from '../di';\nimport {InternalInjectFlags} from '../di/interface/injector';\nimport {TNode, TNodeType} from '../render3/interfaces/node';\nimport {isComponentHost} from '../render3/interfaces/type_checks';\nimport {DECLARATION_COMPONENT_VIEW, LView} from '../render3/interfaces/view';\nimport {getCurrentTNode, getLView} from '../render3/state';\nimport {getComponentLViewByIndex} from '../render3/util/view_utils';\nimport {ViewRef as R3_ViewRef} from '../render3/view_ref';\nimport {noop} from '../util/noop';\n\nexport const SWITCH_CHANGE_DETECTOR_REF_FACTORY__POST_R3__ = injectChangeDetectorRef;\nconst SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__ = noop;\nconst SWITCH_CHANGE_DETECTOR_REF_FACTORY: typeof injectChangeDetectorRef =\n    SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__;\n\n/**\n * Base class that provides change detection functionality.\n * A change-detection tree collects all views that are to be checked for changes.\n * Use the methods to add and remove views from the tree, initiate change-detection,\n * and explicitly mark views as _dirty_, meaning that they have changed and need to be re-rendered.\n *\n * @see [Using change detection hooks](guide/lifecycle-hooks#using-change-detection-hooks)\n * @see [Defining custom change detection](guide/lifecycle-hooks#defining-custom-change-detection)\n *\n * @usageNotes\n *\n * The following examples demonstrate how to modify default change-detection behavior\n * to perform explicit detection when needed.\n *\n * ### Use `markForCheck()` with `CheckOnce` strategy\n *\n * The following example sets the `OnPush` change-detection strategy for a component\n * (`CheckOnce`, rather than the default `CheckAlways`), then forces a second check\n * after an interval. See [live demo](https://plnkr.co/edit/GC512b?p=preview).\n *\n * <code-example path=\"core/ts/change_detect/change-detection.ts\"\n * region=\"mark-for-check\"></code-example>\n *\n * ### Detach change detector to limit how often check occurs\n *\n * The following example defines a component with a large list of read-only data\n * that is expected to change constantly, many times per second.\n * To improve performance, we want to check and update the list\n * less often than the changes actually occur. To do that, we detach\n * the component's change detector and perform an explicit local check every five seconds.\n *\n * <code-example path=\"core/ts/change_detect/change-detection.ts\" region=\"detach\"></code-example>\n *\n *\n * ### Reattaching a detached component\n *\n * The following example creates a component displaying live data.\n * The component detaches its change detector from the main change detector tree\n * when the `live` property is set to false, and reattaches it when the property\n * becomes true.\n *\n * <code-example path=\"core/ts/change_detect/change-detection.ts\" region=\"reattach\"></code-example>\n *\n * @publicApi\n */\nexport abstract class ChangeDetectorRef {\n  /**\n   * When a view uses the {@link ChangeDetectionStrategy#OnPush OnPush} (checkOnce)\n   * change detection strategy, explicitly marks the view as changed so that\n   * it can be checked again.\n   *\n   * Components are normally marked as dirty (in need of rerendering) when inputs\n   * have changed or events have fired in the view. Call this method to ensure that\n   * a component is checked even if these triggers have not occured.\n   *\n   * <!-- TODO: Add a link to a chapter on OnPush components -->\n   *\n   */\n  abstract markForCheck(): void;\n\n  /**\n   * Detaches this view from the change-detection tree.\n   * A detached view is  not checked until it is reattached.\n   * Use in combination with `detectChanges()` to implement local change detection checks.\n   *\n   * Detached views are not checked during change detection runs until they are\n   * re-attached, even if they are marked as dirty.\n   *\n   * <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->\n   * <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->\n   *\n   */\n  abstract detach(): void;\n\n  /**\n   * Checks this view and its children. Use in combination with {@link ChangeDetectorRef#detach\n   * detach}\n   * to implement local change detection checks.\n   *\n   * <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->\n   * <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->\n   *\n   */\n  abstract detectChanges(): void;\n\n  /**\n   * Checks the change detector and its children, and throws if any changes are detected.\n   *\n   * Use in development mode to verify that running change detection doesn't introduce\n   * other changes.\n   */\n  abstract checkNoChanges(): void;\n\n  /**\n   * Re-attaches the previously detached view to the change detection tree.\n   * Views are attached to the tree by default.\n   *\n   * <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->\n   *\n   */\n  abstract reattach(): void;\n\n  /**\n   * @internal\n   * @nocollapse\n   */\n  static __NG_ELEMENT_ID__:\n      (flags: InjectFlags) => ChangeDetectorRef = SWITCH_CHANGE_DETECTOR_REF_FACTORY;\n}\n\n\n\n/** Returns a ChangeDetectorRef (a.k.a. a ViewRef) */\nexport function injectChangeDetectorRef(flags: InjectFlags): ChangeDetectorRef {\n  return createViewRef(\n      getCurrentTNode()!, getLView(),\n      (flags & InternalInjectFlags.ForPipe) === InternalInjectFlags.ForPipe);\n}\n\n/**\n * Creates a ViewRef and stores it on the injector as ChangeDetectorRef (public alias).\n *\n * @param tNode The node that is requesting a ChangeDetectorRef\n * @param lView The view to which the node belongs\n * @param isPipe Whether the view is being injected into a pipe.\n * @returns The ChangeDetectorRef to use\n */\nfunction createViewRef(tNode: TNode, lView: LView, isPipe: boolean): ChangeDetectorRef {\n  if (isComponentHost(tNode) && !isPipe) {\n    // The LView represents the location where the component is declared.\n    // Instead we want the LView for the component View and so we need to look it up.\n    const componentView = getComponentLViewByIndex(tNode.index, lView);  // look down\n    return new R3_ViewRef(componentView, componentView);\n  } else if (tNode.type & (TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Icu)) {\n    // The LView represents the location where the injection is requested from.\n    // We need to locate the containing LView (in case where the `lView` is an embedded view)\n    const hostComponentView = lView[DECLARATION_COMPONENT_VIEW];  // look up\n    return new R3_ViewRef(hostComponentView, lView);\n  }\n  return null!;\n}\n"]} |
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