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fix(ivy): support static ContentChild queries (#28811)

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This commit adds support for the `static: true` flag in `ContentChild`
queries. Prior to this commit, all `ContentChild` queries were resolved
after change detection ran. This is a problem for backwards
compatibility because View Engine also supported "static" queries which
would resolve before change detection.

Now if users add a `static: true` option, the query will be resolved in
creation mode (before change detection runs). For example:

```ts
@ContentChild(TemplateRef, {static: true}) template !: TemplateRef;
```

This feature will come in handy for components that need
to create components dynamically.

PR Close #28811
This commit is contained in:
Kara Erickson
2019-02-18 18:18:56 -08:00
committed by Igor Minar
parent a4638d5a81
commit 3c1a1620e3
10 changed files with 261 additions and 50 deletions
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7
packages/compiler/src/render3/view/compiler.ts
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@ -518,9 +518,12 @@ function createContentQueriesFunction(
const tempAllocator = temporaryAllocator(updateStatements, TEMPORARY_NAME);
for (const query of meta.queries) {
// creation, e.g. r3.contentQuery(dirIndex, somePredicate, true);
// creation, e.g. r3.contentQuery(dirIndex, somePredicate, true, null);
const args = [o.variable('dirIndex'), ...prepareQueryParams(query, constantPool) as any];
createStatements.push(o.importExpr(R3.contentQuery).callFn(args).toStmt());
const queryInstruction = query.static ? R3.staticContentQuery : R3.contentQuery;
createStatements.push(o.importExpr(queryInstruction).callFn(args).toStmt());
// update, e.g. (r3.queryRefresh(tmp = r3.loadContentQuery()) && (ctx.someDir = tmp));
const temporary = tempAllocator();