Added onTick event to animations.

src/core/animations/CoreAnimation.ts

@@ -326,6 +326,10 @@ export class CoreAnimation extends EventEmitter {
       }
     }
 
+    if (this.progress < 1) {
+      this.emit('tick', {});
+    }
+
     if (this.progress === 1) {
       this.emit('finished', {});
     }

src/core/animations/CoreAnimationController.ts

@@ -50,6 +50,7 @@ export class CoreAnimationController
     // Bind event handlers
     this.onAnimating = this.onAnimating.bind(this);
     this.onFinished = this.onFinished.bind(this);
+    this.onTick = this.onTick.bind(this);
   }
 
   start(): IAnimationController {
@@ -93,6 +94,7 @@ export class CoreAnimationController
     // Hook up event listeners
     this.animation.once('finished', this.onFinished);
     this.animation.on('animating', this.onAnimating);
+    this.animation.on('tick', this.onTick);
     // Then register the animation
     this.manager.registerAnimation(this.animation);
   }
@@ -103,6 +105,7 @@ export class CoreAnimationController
     // Then unhook event listeners
     this.animation.off('finished', this.onFinished);
     this.animation.off('animating', this.onAnimating);
+    this.animation.off('tick', this.onTick);
   }
 
   private makeStoppedPromise(): void {
@@ -142,4 +145,8 @@ export class CoreAnimationController
     this.state = 'running';
     this.emit('animating', this);
   }
+
+  private onTick(this: CoreAnimationController): void {
+    this.emit('tick');
+  }
 }