gistfile1.m

- (void)setupSetVideoListener
{
  
  [emitter on:BCEventSetVideo doChain:^(BCEvent *setVideoEvent, BCEventEmitterChain *chain){
    
    BCVideo *video = [setVideoEvent.details objectForKey:@"video"];
    
    [chain on:BCEventSetVideo callBlock:^(BCEvent *innerSetVideoEvent){
      [chain abort];
    }];
    
    [chain emit:BCEventShouldSetVideo];
    
    [chain thenDo:^(BCEvent *shouldSetVideoEvent){
      if (shouldSetVideoEvent.defaultPrevented) {
        [chain emit:BCEventCancelledSetVideo parentEvent:setVideoEvent];
        [chain abort];
      }
    }];
    
    [chain emit:BCEventWillSetVideo parentEvent:setVideoEvent];
      
    [chain emit:BCEventSetRendition withDetails:
      [NSDictionary dictionaryWithObject:rendition forKey:@"rendition"]];
      
    [chain emit:BCEventSetVideoStill withDetails:
      [NSDictionary dictionaryWithObject:videoStill forKey:@"videoStill"]];
    
    [chain waitForBoth:BCEventDidSetRendition and:BCEventDidSetVideoStill];
    
    [chain thenDo:^{
      self.video = video;
      [chain emit:BCEventDidSetVideo parentEvent:setVideoEvent];
    }];
    
  }];
  
}