//Apex Trigger 
trigger TriggeronContentDocument on ContentDocument (after insert,before delete) {
    if(Trigger.IsAfter && Trigger.IsInsert ){
             //Caliing method of Apex..
         Controller.ControllerMethod(Trigger.new);
    }
     if(Trigger.Isbefore && Trigger.IsDelete ){
              //Caliing method of Apex.. 
            Controller.deleteMethod(Trigger.old);
        }    
   
}