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fix(ivy): unable to project into multiple slots with default selector (#30561)

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With View engine it was possible to declare multiple projection
definitions and to programmatically project nodes into the slots.

e.g.

```html
<ng-content></ng-content>
<ng-content></ng-content>
```

Using `ViewContainerRef#createComponent` allowed projecting
nodes into one of the projection defs (through index)

This no longer works with Ivy as the `projectionDef` instruction only
retrieves a list of selectors instead of also retrieving entries for
reserved projection slots which appear when using the default
selector multiple times (as seen above).

In order to fix this issue, the Ivy compiler now passes all
projection slots to the `projectionDef` instruction. Meaning that
there can be multiple projection slots with the same wildcard
selector. This allows multi-slot projection as seen in the
example above, and it also allows us to match the multi-slot node
projection order from View Engine (to avoid breaking changes).

It basically ensures that Ivy fully matches the View Engine behavior
except of a very small edge case that has already been discussed
in FW-886 (with the conclusion of working as intended).

Read more here: https://hackmd.io/s/Sy2kQlgTE

PR Close #30561
This commit is contained in:
Paul Gschwendtner
2019-05-21 22:00:47 +02:00
committed by Miško Hevery
parent f4cd3740b2
commit aca339e864
13 changed files with 219 additions and 131 deletions
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10
packages/core/src/render3/interfaces/projection.ts
View File

@ -50,6 +50,16 @@ export type CssSelector = (string | SelectorFlags)[];
*/
export type CssSelectorList = CssSelector[];
/**
* List of slots for a projection. A slot can be either based on a parsed CSS selector
* which will be used to determine nodes which are projected into that slot.
*
* When set to "*", the slot is reserved and can be used for multi-slot projection
* using {@link ViewContainerRef#createComponent}. The last slot that specifies the
* wildcard selector will retrieve all projectable nodes which do not match any selector.
*/
export type ProjectionSlots = (CssSelectorList | '*')[];
/** Flags used to build up CssSelectors */
export const enum SelectorFlags {
/** Indicates this is the beginning of a new negative selector */