source: trip-planner-front/node_modules/@angular/core/esm2015/src/change_detection/change_detector_ref.js

/**
 * @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 { isComponentHost } from '../render3/interfaces/type_checks';
import { DECLARATION_COMPONENT_VIEW } from '../render3/interfaces/view';
import { getCurrentTNode, getLView } from '../render3/state';
import { getComponentLViewByIndex } from '../render3/util/view_utils';
import { ViewRef as R3_ViewRef } from '../render3/view_ref';
import { noop } from '../util/noop';
export const SWITCH_CHANGE_DETECTOR_REF_FACTORY__POST_R3__ = injectChangeDetectorRef;
const SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__ = noop;
const SWITCH_CHANGE_DETECTOR_REF_FACTORY = SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__;
/**
 * Base class that provides change detection functionality.
 * A change-detection tree collects all views that are to be checked for changes.
 * Use the methods to add and remove views from the tree, initiate change-detection,
 * and explicitly mark views as _dirty_, meaning that they have changed and need to be re-rendered.
 *
 * @see [Using change detection hooks](guide/lifecycle-hooks#using-change-detection-hooks)
 * @see [Defining custom change detection](guide/lifecycle-hooks#defining-custom-change-detection)
 *
 * @usageNotes
 *
 * The following examples demonstrate how to modify default change-detection behavior
 * to perform explicit detection when needed.
 *
 * ### Use `markForCheck()` with `CheckOnce` strategy
 *
 * The following example sets the `OnPush` change-detection strategy for a component
 * (`CheckOnce`, rather than the default `CheckAlways`), then forces a second check
 * after an interval. See [live demo](https://plnkr.co/edit/GC512b?p=preview).
 *
 * <code-example path="core/ts/change_detect/change-detection.ts"
 * region="mark-for-check"></code-example>
 *
 * ### Detach change detector to limit how often check occurs
 *
 * The following example defines a component with a large list of read-only data
 * that is expected to change constantly, many times per second.
 * To improve performance, we want to check and update the list
 * less often than the changes actually occur. To do that, we detach
 * the component's change detector and perform an explicit local check every five seconds.
 *
 * <code-example path="core/ts/change_detect/change-detection.ts" region="detach"></code-example>
 *
 *
 * ### Reattaching a detached component
 *
 * The following example creates a component displaying live data.
 * The component detaches its change detector from the main change detector tree
 * when the `live` property is set to false, and reattaches it when the property
 * becomes true.
 *
 * <code-example path="core/ts/change_detect/change-detection.ts" region="reattach"></code-example>
 *
 * @publicApi
 */
export class ChangeDetectorRef {
}
/**
 * @internal
 * @nocollapse
 */
ChangeDetectorRef.__NG_ELEMENT_ID__ = SWITCH_CHANGE_DETECTOR_REF_FACTORY;
/** Returns a ChangeDetectorRef (a.k.a. a ViewRef) */
export function injectChangeDetectorRef(flags) {
    return createViewRef(getCurrentTNode(), getLView(), (flags & 16 /* ForPipe */) === 16 /* ForPipe */);
}
/**
 * Creates a ViewRef and stores it on the injector as ChangeDetectorRef (public alias).
 *
 * @param tNode The node that is requesting a ChangeDetectorRef
 * @param lView The view to which the node belongs
 * @param isPipe Whether the view is being injected into a pipe.
 * @returns The ChangeDetectorRef to use
 */
function createViewRef(tNode, lView, isPipe) {
    if (isComponentHost(tNode) && !isPipe) {
        // The LView represents the location where the component is declared.
        // Instead we want the LView for the component View and so we need to look it up.
        const componentView = getComponentLViewByIndex(tNode.index, lView); // look down
        return new R3_ViewRef(componentView, componentView);
    }
    else if (tNode.type & (3 /* AnyRNode */ | 12 /* AnyContainer */ | 32 /* Icu */)) {
        // The LView represents the location where the injection is requested from.
        // We need to locate the containing LView (in case where the `lView` is an embedded view)
        const hostComponentView = lView[DECLARATION_COMPONENT_VIEW]; // look up
        return new R3_ViewRef(hostComponentView, lView);
    }
    return null;
}
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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"]}