feat(animations): support negative query option values

closes #19259
2017-09-18 14:47:43 -07:00
parent b54368bf35
commit 86ffacf7ce
2 changed files with 52 additions and 1 deletions
--- a/packages/animations/browser/src/dsl/animation_timeline_builder.ts
+++ b/packages/animations/browser/src/dsl/animation_timeline_builder.ts
@ -558,7 +558,8 @@ export class AnimationTimelineContext {
      const multi = limit != 1;
      let elements = this._driver.query(this.element, selector, multi);
      if (limit !== 0) {
-        elements = elements.slice(0, limit);
+        elements = limit < 0 ? elements.slice(elements.length + limit, elements.length) :
+                               elements.slice(0, limit);
      }
      results.push(...elements);
    }