@angular/core
Version:
Angular - the core framework
71 lines • 9.06 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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 { assertDefined } from '../../util/assert';
import { assertLView } from '../assert';
import { CONTEXT, DECLARATION_VIEW, FLAGS, PARENT, T_HOST } from '../interfaces/view';
import { isLContainer, isLView, readPatchedLView } from './view_utils';
/**
* Gets the parent LView of the passed LView, if the PARENT is an LContainer, will get the parent of
* that LContainer, which is an LView
* @param lView the lView whose parent to get
*/
export function getLViewParent(lView) {
ngDevMode && assertLView(lView);
var parent = lView[PARENT];
return isLContainer(parent) ? parent[PARENT] : parent;
}
/**
* Retrieve the root view from any component or `LView` by walking the parent `LView` until
* reaching the root `LView`.
*
* @param componentOrLView any component or `LView`
*/
export function getRootView(componentOrLView) {
ngDevMode && assertDefined(componentOrLView, 'component');
var lView = isLView(componentOrLView) ? componentOrLView : readPatchedLView(componentOrLView);
while (lView && !(lView[FLAGS] & 512 /* IsRoot */)) {
lView = getLViewParent(lView);
}
ngDevMode && assertLView(lView);
return lView;
}
/**
* Given an `LView`, find the closest declaration view which is not an embedded view.
*
* This method searches for the `LView` associated with the component which declared the `LView`.
*
* This function may return itself if the `LView` passed in is not an embedded `LView`. Otherwise
* it walks the declaration parents until it finds a component view (non-embedded-view.)
*
* @param lView LView for which we want a host element node
* @returns The host node
*/
export function findComponentView(lView) {
var rootTNode = lView[T_HOST];
while (rootTNode !== null && rootTNode.type === 2 /* View */) {
ngDevMode && assertDefined(lView[DECLARATION_VIEW], 'lView[DECLARATION_VIEW]');
lView = lView[DECLARATION_VIEW];
rootTNode = lView[T_HOST];
}
ngDevMode && assertLView(lView);
return lView;
}
/**
* Returns the `RootContext` instance that is associated with
* the application where the target is situated. It does this by walking the parent views until it
* gets to the root view, then getting the context off of that.
*
* @param viewOrComponent the `LView` or component to get the root context for.
*/
export function getRootContext(viewOrComponent) {
var rootView = getRootView(viewOrComponent);
ngDevMode &&
assertDefined(rootView[CONTEXT], 'RootView has no context. Perhaps it is disconnected?');
return rootView[CONTEXT];
}
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