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feat(animations): re-introduce support for transition matching functions (#20723)

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Closes #18959

PR Close #20723
This commit is contained in:
Matias Niemelä
2017-11-30 16:15:48 -08:00
committed by Jason Aden
parent c26e1bba1d
commit 590d93b30d
3 changed files with 44 additions and 4 deletions
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5
packages/animations/src/animation_metadata.ts
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@ -115,7 +115,7 @@ export interface AnimationStateMetadata extends AnimationMetadata {
* @experimental Animation support is experimental.
*/
export interface AnimationTransitionMetadata extends AnimationMetadata {
expr: string;
expr: string|((fromState: string, toState: string) => boolean);
animation: AnimationMetadata|AnimationMetadata[];
options: AnimationOptions|null;
}
@ -836,7 +836,8 @@ export function keyframes(steps: AnimationStyleMetadata[]): AnimationKeyframesSe
* @experimental Animation support is experimental.
*/
export function transition(
stateChangeExpr: string, steps: AnimationMetadata | AnimationMetadata[],
stateChangeExpr: string | ((fromState: string, toState: string) => boolean),
steps: AnimationMetadata | AnimationMetadata[],
options: AnimationOptions | null = null): AnimationTransitionMetadata {
return {type: AnimationMetadataType.Transition, expr: stateChangeExpr, animation: steps, options};
}