| 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 { assertGreaterThan } from '../../util/assert';
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| 9 | import { assertIndexInDeclRange } from '../assert';
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| 10 | import { executeCheckHooks, executeInitAndCheckHooks } from '../hooks';
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| 11 | import { FLAGS } from '../interfaces/view';
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| 12 | import { getLView, getSelectedIndex, getTView, isInCheckNoChangesMode, setSelectedIndex } from '../state';
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| 13 | /**
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| 14 | * Advances to an element for later binding instructions.
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| 15 | *
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| 16 | * Used in conjunction with instructions like {@link property} to act on elements with specified
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| 17 | * indices, for example those created with {@link element} or {@link elementStart}.
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| 18 | *
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| 19 | * ```ts
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| 20 | * (rf: RenderFlags, ctx: any) => {
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| 21 | * if (rf & 1) {
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| 22 | * text(0, 'Hello');
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| 23 | * text(1, 'Goodbye')
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| 24 | * element(2, 'div');
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| 25 | * }
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| 26 | * if (rf & 2) {
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| 27 | * advance(2); // Advance twice to the <div>.
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| 28 | * property('title', 'test');
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| 29 | * }
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| 30 | * }
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| 31 | * ```
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| 32 | * @param delta Number of elements to advance forwards by.
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| 33 | *
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| 34 | * @codeGenApi
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| 35 | */
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| 36 | export function ɵɵadvance(delta) {
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| 37 | ngDevMode && assertGreaterThan(delta, 0, 'Can only advance forward');
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| 38 | selectIndexInternal(getTView(), getLView(), getSelectedIndex() + delta, isInCheckNoChangesMode());
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| 39 | }
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| 40 | export function selectIndexInternal(tView, lView, index, checkNoChangesMode) {
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| 41 | ngDevMode && assertIndexInDeclRange(lView, index);
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| 42 | // Flush the initial hooks for elements in the view that have been added up to this point.
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| 43 | // PERF WARNING: do NOT extract this to a separate function without running benchmarks
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| 44 | if (!checkNoChangesMode) {
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| 45 | const hooksInitPhaseCompleted = (lView[FLAGS] & 3 /* InitPhaseStateMask */) === 3 /* InitPhaseCompleted */;
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| 46 | if (hooksInitPhaseCompleted) {
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| 47 | const preOrderCheckHooks = tView.preOrderCheckHooks;
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| 48 | if (preOrderCheckHooks !== null) {
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| 49 | executeCheckHooks(lView, preOrderCheckHooks, index);
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| 50 | }
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| 51 | }
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| 52 | else {
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| 53 | const preOrderHooks = tView.preOrderHooks;
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| 54 | if (preOrderHooks !== null) {
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| 55 | executeInitAndCheckHooks(lView, preOrderHooks, 0 /* OnInitHooksToBeRun */, index);
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| 56 | }
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| 57 | }
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| 58 | }
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| 59 | // We must set the selected index *after* running the hooks, because hooks may have side-effects
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| 60 | // that cause other template functions to run, thus updating the selected index, which is global
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| 61 | // state. If we run `setSelectedIndex` *before* we run the hooks, in some cases the selected index
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| 62 | // will be altered by the time we leave the `ɵɵadvance` instruction.
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| 63 | setSelectedIndex(index);
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| 64 | }
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| 65 | //# 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