@angular/core
Version:
Angular - the core framework
253 lines • 32.1 kB
JavaScript
/**
* @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 { getEnsureDirtyViewsAreAlwaysReachable } from '../../change_detection/flags';
import { RuntimeError } from '../../errors';
import { assertDefined, assertGreaterThan, assertGreaterThanOrEqual, assertIndexInRange, assertLessThan } from '../../util/assert';
import { assertLView, assertTNode, assertTNodeForLView } from '../assert';
import { TYPE } from '../interfaces/container';
import { isLContainer, isLView } from '../interfaces/type_checks';
import { DECLARATION_VIEW, ENVIRONMENT, FLAGS, HEADER_OFFSET, HOST, ON_DESTROY_HOOKS, PARENT, PREORDER_HOOK_FLAGS, REACTIVE_TEMPLATE_CONSUMER } from '../interfaces/view';
/**
* For efficiency reasons we often put several different data types (`RNode`, `LView`, `LContainer`)
* in same location in `LView`. This is because we don't want to pre-allocate space for it
* because the storage is sparse. This file contains utilities for dealing with such data types.
*
* How do we know what is stored at a given location in `LView`.
* - `Array.isArray(value) === false` => `RNode` (The normal storage value)
* - `Array.isArray(value) === true` => then the `value[0]` represents the wrapped value.
* - `typeof value[TYPE] === 'object'` => `LView`
* - This happens when we have a component at a given location
* - `typeof value[TYPE] === true` => `LContainer`
* - This happens when we have `LContainer` binding at a given location.
*
*
* NOTE: it is assumed that `Array.isArray` and `typeof` operations are very efficient.
*/
/**
* Returns `RNode`.
* @param value wrapped value of `RNode`, `LView`, `LContainer`
*/
export function unwrapRNode(value) {
while (Array.isArray(value)) {
value = value[HOST];
}
return value;
}
/**
* Returns `LView` or `null` if not found.
* @param value wrapped value of `RNode`, `LView`, `LContainer`
*/
export function unwrapLView(value) {
while (Array.isArray(value)) {
// This check is same as `isLView()` but we don't call at as we don't want to call
// `Array.isArray()` twice and give JITer more work for inlining.
if (typeof value[TYPE] === 'object')
return value;
value = value[HOST];
}
return null;
}
/**
* Retrieves an element value from the provided `viewData`, by unwrapping
* from any containers, component views, or style contexts.
*/
export function getNativeByIndex(index, lView) {
ngDevMode && assertIndexInRange(lView, index);
ngDevMode && assertGreaterThanOrEqual(index, HEADER_OFFSET, 'Expected to be past HEADER_OFFSET');
return unwrapRNode(lView[index]);
}
/**
* Retrieve an `RNode` for a given `TNode` and `LView`.
*
* This function guarantees in dev mode to retrieve a non-null `RNode`.
*
* @param tNode
* @param lView
*/
export function getNativeByTNode(tNode, lView) {
ngDevMode && assertTNodeForLView(tNode, lView);
ngDevMode && assertIndexInRange(lView, tNode.index);
const node = unwrapRNode(lView[tNode.index]);
return node;
}
/**
* Retrieve an `RNode` or `null` for a given `TNode` and `LView`.
*
* Some `TNode`s don't have associated `RNode`s. For example `Projection`
*
* @param tNode
* @param lView
*/
export function getNativeByTNodeOrNull(tNode, lView) {
const index = tNode === null ? -1 : tNode.index;
if (index !== -1) {
ngDevMode && assertTNodeForLView(tNode, lView);
const node = unwrapRNode(lView[index]);
return node;
}
return null;
}
// fixme(misko): The return Type should be `TNode|null`
export function getTNode(tView, index) {
ngDevMode && assertGreaterThan(index, -1, 'wrong index for TNode');
ngDevMode && assertLessThan(index, tView.data.length, 'wrong index for TNode');
const tNode = tView.data[index];
ngDevMode && tNode !== null && assertTNode(tNode);
return tNode;
}
/** Retrieves a value from any `LView` or `TData`. */
export function load(view, index) {
ngDevMode && assertIndexInRange(view, index);
return view[index];
}
export function getComponentLViewByIndex(nodeIndex, hostView) {
// Could be an LView or an LContainer. If LContainer, unwrap to find LView.
ngDevMode && assertIndexInRange(hostView, nodeIndex);
const slotValue = hostView[nodeIndex];
const lView = isLView(slotValue) ? slotValue : slotValue[HOST];
return lView;
}
/** Checks whether a given view is in creation mode */
export function isCreationMode(view) {
return (view[FLAGS] & 4 /* LViewFlags.CreationMode */) === 4 /* LViewFlags.CreationMode */;
}
/**
* Returns a boolean for whether the view is attached to the change detection tree.
*
* Note: This determines whether a view should be checked, not whether it's inserted
* into a container. For that, you'll want `viewAttachedToContainer` below.
*/
export function viewAttachedToChangeDetector(view) {
return (view[FLAGS] & 128 /* LViewFlags.Attached */) === 128 /* LViewFlags.Attached */;
}
/** Returns a boolean for whether the view is attached to a container. */
export function viewAttachedToContainer(view) {
return isLContainer(view[PARENT]);
}
export function getConstant(consts, index) {
if (index === null || index === undefined)
return null;
ngDevMode && assertIndexInRange(consts, index);
return consts[index];
}
/**
* Resets the pre-order hook flags of the view.
* @param lView the LView on which the flags are reset
*/
export function resetPreOrderHookFlags(lView) {
lView[PREORDER_HOOK_FLAGS] = 0;
}
/**
* Adds the `RefreshView` flag from the lView and updates HAS_CHILD_VIEWS_TO_REFRESH flag of
* parents.
*/
export function markViewForRefresh(lView) {
if (lView[FLAGS] & 1024 /* LViewFlags.RefreshView */) {
return;
}
lView[FLAGS] |= 1024 /* LViewFlags.RefreshView */;
if (viewAttachedToChangeDetector(lView)) {
markAncestorsForTraversal(lView);
}
}
/**
* Walks up the LView hierarchy.
* @param nestingLevel Number of times to walk up in hierarchy.
* @param currentView View from which to start the lookup.
*/
export function walkUpViews(nestingLevel, currentView) {
while (nestingLevel > 0) {
ngDevMode &&
assertDefined(currentView[DECLARATION_VIEW], 'Declaration view should be defined if nesting level is greater than 0.');
currentView = currentView[DECLARATION_VIEW];
nestingLevel--;
}
return currentView;
}
export function requiresRefreshOrTraversal(lView) {
return lView[FLAGS] & (1024 /* LViewFlags.RefreshView */ | 8192 /* LViewFlags.HasChildViewsToRefresh */) ||
lView[REACTIVE_TEMPLATE_CONSUMER]?.dirty;
}
/**
* Updates the `HasChildViewsToRefresh` flag on the parents of the `LView` as well as the
* parents above.
*/
export function updateAncestorTraversalFlagsOnAttach(lView) {
// TODO(atscott): Simplify if...else cases once getEnsureDirtyViewsAreAlwaysReachable is always
// `true`. When we attach a view that's marked `Dirty`, we should ensure that it is reached during
// the next CD traversal so we add the `RefreshView` flag and mark ancestors accordingly.
if (requiresRefreshOrTraversal(lView)) {
markAncestorsForTraversal(lView);
}
else if (lView[FLAGS] & 64 /* LViewFlags.Dirty */) {
if (getEnsureDirtyViewsAreAlwaysReachable()) {
lView[FLAGS] |= 1024 /* LViewFlags.RefreshView */;
markAncestorsForTraversal(lView);
}
else {
lView[ENVIRONMENT].changeDetectionScheduler?.notify();
}
}
}
/**
* Ensures views above the given `lView` are traversed during change detection even when they are
* not dirty.
*
* This is done by setting the `HAS_CHILD_VIEWS_TO_REFRESH` flag up to the root, stopping when the
* flag is already `true` or the `lView` is detached.
*/
export function markAncestorsForTraversal(lView) {
lView[ENVIRONMENT].changeDetectionScheduler?.notify();
let parent = getLViewParent(lView);
while (parent !== null) {
// We stop adding markers to the ancestors once we reach one that already has the marker. This
// is to avoid needlessly traversing all the way to the root when the marker already exists.
if (parent[FLAGS] & 8192 /* LViewFlags.HasChildViewsToRefresh */) {
break;
}
parent[FLAGS] |= 8192 /* LViewFlags.HasChildViewsToRefresh */;
if (!viewAttachedToChangeDetector(parent)) {
break;
}
parent = getLViewParent(parent);
}
}
/**
* Stores a LView-specific destroy callback.
*/
export function storeLViewOnDestroy(lView, onDestroyCallback) {
if ((lView[FLAGS] & 256 /* LViewFlags.Destroyed */) === 256 /* LViewFlags.Destroyed */) {
throw new RuntimeError(911 /* RuntimeErrorCode.VIEW_ALREADY_DESTROYED */, ngDevMode && 'View has already been destroyed.');
}
if (lView[ON_DESTROY_HOOKS] === null) {
lView[ON_DESTROY_HOOKS] = [];
}
lView[ON_DESTROY_HOOKS].push(onDestroyCallback);
}
/**
* Removes previously registered LView-specific destroy callback.
*/
export function removeLViewOnDestroy(lView, onDestroyCallback) {
if (lView[ON_DESTROY_HOOKS] === null)
return;
const destroyCBIdx = lView[ON_DESTROY_HOOKS].indexOf(onDestroyCallback);
if (destroyCBIdx !== -1) {
lView[ON_DESTROY_HOOKS].splice(destroyCBIdx, 1);
}
}
/**
* 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);
const parent = lView[PARENT];
return isLContainer(parent) ? parent[PARENT] : parent;
}
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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 {getEnsureDirtyViewsAreAlwaysReachable} from '../../change_detection/flags';\nimport {RuntimeError, RuntimeErrorCode} from '../../errors';\nimport {assertDefined, assertGreaterThan, assertGreaterThanOrEqual, assertIndexInRange, assertLessThan} from '../../util/assert';\nimport {assertLView, assertTNode, assertTNodeForLView} from '../assert';\nimport {LContainer, TYPE} from '../interfaces/container';\nimport {TConstants, TNode} from '../interfaces/node';\nimport {RNode} from '../interfaces/renderer_dom';\nimport {isLContainer, isLView} from '../interfaces/type_checks';\nimport {DECLARATION_VIEW, ENVIRONMENT, FLAGS, HEADER_OFFSET, HOST, LView, LViewFlags, ON_DESTROY_HOOKS, PARENT, PREORDER_HOOK_FLAGS, PreOrderHookFlags, REACTIVE_TEMPLATE_CONSUMER, TData, TView} from '../interfaces/view';\n\n\n\n/**\n * For efficiency reasons we often put several different data types (`RNode`, `LView`, `LContainer`)\n * in same location in `LView`. This is because we don't want to pre-allocate space for it\n * because the storage is sparse. This file contains utilities for dealing with such data types.\n *\n * How do we know what is stored at a given location in `LView`.\n * - `Array.isArray(value) === false` => `RNode` (The normal storage value)\n * - `Array.isArray(value) === true` => then the `value[0]` represents the wrapped value.\n *   - `typeof value[TYPE] === 'object'` => `LView`\n *      - This happens when we have a component at a given location\n *   - `typeof value[TYPE] === true` => `LContainer`\n *      - This happens when we have `LContainer` binding at a given location.\n *\n *\n * NOTE: it is assumed that `Array.isArray` and `typeof` operations are very efficient.\n */\n\n/**\n * Returns `RNode`.\n * @param value wrapped value of `RNode`, `LView`, `LContainer`\n */\nexport function unwrapRNode(value: RNode|LView|LContainer): RNode {\n  while (Array.isArray(value)) {\n    value = value[HOST] as any;\n  }\n  return value as RNode;\n}\n\n/**\n * Returns `LView` or `null` if not found.\n * @param value wrapped value of `RNode`, `LView`, `LContainer`\n */\nexport function unwrapLView(value: RNode|LView|LContainer): LView|null {\n  while (Array.isArray(value)) {\n    // This check is same as `isLView()` but we don't call at as we don't want to call\n    // `Array.isArray()` twice and give JITer more work for inlining.\n    if (typeof value[TYPE] === 'object') return value as LView;\n    value = value[HOST] as any;\n  }\n  return null;\n}\n\n/**\n * Retrieves an element value from the provided `viewData`, by unwrapping\n * from any containers, component views, or style contexts.\n */\nexport function getNativeByIndex(index: number, lView: LView): RNode {\n  ngDevMode && assertIndexInRange(lView, index);\n  ngDevMode && assertGreaterThanOrEqual(index, HEADER_OFFSET, 'Expected to be past HEADER_OFFSET');\n  return unwrapRNode(lView[index]);\n}\n\n/**\n * Retrieve an `RNode` for a given `TNode` and `LView`.\n *\n * This function guarantees in dev mode to retrieve a non-null `RNode`.\n *\n * @param tNode\n * @param lView\n */\nexport function getNativeByTNode(tNode: TNode, lView: LView): RNode {\n  ngDevMode && assertTNodeForLView(tNode, lView);\n  ngDevMode && assertIndexInRange(lView, tNode.index);\n  const node: RNode = unwrapRNode(lView[tNode.index]);\n  return node;\n}\n\n/**\n * Retrieve an `RNode` or `null` for a given `TNode` and `LView`.\n *\n * Some `TNode`s don't have associated `RNode`s. For example `Projection`\n *\n * @param tNode\n * @param lView\n */\nexport function getNativeByTNodeOrNull(tNode: TNode|null, lView: LView): RNode|null {\n  const index = tNode === null ? -1 : tNode.index;\n  if (index !== -1) {\n    ngDevMode && assertTNodeForLView(tNode!, lView);\n    const node: RNode|null = unwrapRNode(lView[index]);\n    return node;\n  }\n  return null;\n}\n\n\n// fixme(misko): The return Type should be `TNode|null`\nexport function getTNode(tView: TView, index: number): TNode {\n  ngDevMode && assertGreaterThan(index, -1, 'wrong index for TNode');\n  ngDevMode && assertLessThan(index, tView.data.length, 'wrong index for TNode');\n  const tNode = tView.data[index] as TNode;\n  ngDevMode && tNode !== null && assertTNode(tNode);\n  return tNode;\n}\n\n/** Retrieves a value from any `LView` or `TData`. */\nexport function load<T>(view: LView|TData, index: number): T {\n  ngDevMode && assertIndexInRange(view, index);\n  return view[index];\n}\n\nexport function getComponentLViewByIndex(nodeIndex: number, hostView: LView): LView {\n  // Could be an LView or an LContainer. If LContainer, unwrap to find LView.\n  ngDevMode && assertIndexInRange(hostView, nodeIndex);\n  const slotValue = hostView[nodeIndex];\n  const lView = isLView(slotValue) ? slotValue : slotValue[HOST];\n  return lView;\n}\n\n/** Checks whether a given view is in creation mode */\nexport function isCreationMode(view: LView): boolean {\n  return (view[FLAGS] & LViewFlags.CreationMode) === LViewFlags.CreationMode;\n}\n\n/**\n * Returns a boolean for whether the view is attached to the change detection tree.\n *\n * Note: This determines whether a view should be checked, not whether it's inserted\n * into a container. For that, you'll want `viewAttachedToContainer` below.\n */\nexport function viewAttachedToChangeDetector(view: LView): boolean {\n  return (view[FLAGS] & LViewFlags.Attached) === LViewFlags.Attached;\n}\n\n/** Returns a boolean for whether the view is attached to a container. */\nexport function viewAttachedToContainer(view: LView): boolean {\n  return isLContainer(view[PARENT]);\n}\n\n/** Returns a constant from `TConstants` instance. */\nexport function getConstant<T>(consts: TConstants|null, index: null|undefined): null;\nexport function getConstant<T>(consts: TConstants, index: number): T|null;\nexport function getConstant<T>(consts: TConstants|null, index: number|null|undefined): T|null;\nexport function getConstant<T>(consts: TConstants|null, index: number|null|undefined): T|null {\n  if (index === null || index === undefined) return null;\n  ngDevMode && assertIndexInRange(consts!, index);\n  return consts![index] as unknown as T;\n}\n\n/**\n * Resets the pre-order hook flags of the view.\n * @param lView the LView on which the flags are reset\n */\nexport function resetPreOrderHookFlags(lView: LView) {\n  lView[PREORDER_HOOK_FLAGS] = 0 as PreOrderHookFlags;\n}\n\n/**\n * Adds the `RefreshView` flag from the lView and updates HAS_CHILD_VIEWS_TO_REFRESH flag of\n * parents.\n */\nexport function markViewForRefresh(lView: LView) {\n  if (lView[FLAGS] & LViewFlags.RefreshView) {\n    return;\n  }\n  lView[FLAGS] |= LViewFlags.RefreshView;\n  if (viewAttachedToChangeDetector(lView)) {\n    markAncestorsForTraversal(lView);\n  }\n}\n\n/**\n * Walks up the LView hierarchy.\n * @param nestingLevel Number of times to walk up in hierarchy.\n * @param currentView View from which to start the lookup.\n */\nexport function walkUpViews(nestingLevel: number, currentView: LView): LView {\n  while (nestingLevel > 0) {\n    ngDevMode &&\n        assertDefined(\n            currentView[DECLARATION_VIEW],\n            'Declaration view should be defined if nesting level is greater than 0.');\n    currentView = currentView[DECLARATION_VIEW]!;\n    nestingLevel--;\n  }\n  return currentView;\n}\n\nexport function requiresRefreshOrTraversal(lView: LView) {\n  return lView[FLAGS] & (LViewFlags.RefreshView | LViewFlags.HasChildViewsToRefresh) ||\n      lView[REACTIVE_TEMPLATE_CONSUMER]?.dirty;\n}\n\n\n/**\n * Updates the `HasChildViewsToRefresh` flag on the parents of the `LView` as well as the\n * parents above.\n */\nexport function updateAncestorTraversalFlagsOnAttach(lView: LView) {\n  // TODO(atscott): Simplify if...else cases once getEnsureDirtyViewsAreAlwaysReachable is always\n  // `true`. When we attach a view that's marked `Dirty`, we should ensure that it is reached during\n  // the next CD traversal so we add the `RefreshView` flag and mark ancestors accordingly.\n  if (requiresRefreshOrTraversal(lView)) {\n    markAncestorsForTraversal(lView);\n  } else if (lView[FLAGS] & LViewFlags.Dirty) {\n    if (getEnsureDirtyViewsAreAlwaysReachable()) {\n      lView[FLAGS] |= LViewFlags.RefreshView;\n      markAncestorsForTraversal(lView);\n    } else {\n      lView[ENVIRONMENT].changeDetectionScheduler?.notify();\n    }\n  }\n}\n\n/**\n * Ensures views above the given `lView` are traversed during change detection even when they are\n * not dirty.\n *\n * This is done by setting the `HAS_CHILD_VIEWS_TO_REFRESH` flag up to the root, stopping when the\n * flag is already `true` or the `lView` is detached.\n */\nexport function markAncestorsForTraversal(lView: LView) {\n  lView[ENVIRONMENT].changeDetectionScheduler?.notify();\n  let parent = getLViewParent(lView);\n  while (parent !== null) {\n    // We stop adding markers to the ancestors once we reach one that already has the marker. This\n    // is to avoid needlessly traversing all the way to the root when the marker already exists.\n    if (parent[FLAGS] & LViewFlags.HasChildViewsToRefresh) {\n      break;\n    }\n\n    parent[FLAGS] |= LViewFlags.HasChildViewsToRefresh;\n    if (!viewAttachedToChangeDetector(parent)) {\n      break;\n    }\n    parent = getLViewParent(parent);\n  }\n}\n\n/**\n * Stores a LView-specific destroy callback.\n */\nexport function storeLViewOnDestroy(lView: LView, onDestroyCallback: () => void) {\n  if ((lView[FLAGS] & LViewFlags.Destroyed) === LViewFlags.Destroyed) {\n    throw new RuntimeError(\n        RuntimeErrorCode.VIEW_ALREADY_DESTROYED, ngDevMode && 'View has already been destroyed.');\n  }\n  if (lView[ON_DESTROY_HOOKS] === null) {\n    lView[ON_DESTROY_HOOKS] = [];\n  }\n  lView[ON_DESTROY_HOOKS].push(onDestroyCallback);\n}\n\n/**\n * Removes previously registered LView-specific destroy callback.\n */\nexport function removeLViewOnDestroy(lView: LView, onDestroyCallback: () => void) {\n  if (lView[ON_DESTROY_HOOKS] === null) return;\n\n  const destroyCBIdx = lView[ON_DESTROY_HOOKS].indexOf(onDestroyCallback);\n  if (destroyCBIdx !== -1) {\n    lView[ON_DESTROY_HOOKS].splice(destroyCBIdx, 1);\n  }\n}\n\n/**\n * Gets the parent LView of the passed LView, if the PARENT is an LContainer, will get the parent of\n * that LContainer, which is an LView\n * @param lView the lView whose parent to get\n */\nexport function getLViewParent(lView: LView): LView|null {\n  ngDevMode && assertLView(lView);\n  const parent = lView[PARENT];\n  return isLContainer(parent) ? parent[PARENT] : parent;\n}\n"]}