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

This commit adds support for the `static: true` flag in
`ViewChild` queries. Prior to this commit, all `ViewChild`
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
@ViewChild(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 17:33:59 -08:00
committed by Igor Minar
parent ae16378ee7
commit a4638d5a81
26 changed files with 340 additions and 163 deletions

View File

@ -376,6 +376,14 @@ export interface TView {
*/
expandoStartIndex: number;
/**
* Whether or not there are any static view queries tracked on this view.
*
* We store this so we know whether or not we should do a view query
* refresh after creation mode to collect static query results.
*/
staticViewQueries: boolean;
/**
* The index where the viewQueries section of `LView` begins. This section contains
* view queries defined for a component/directive.