on FileUploaded event, so confusing

[epicleptico]

Just reviwing what code does on FileUploaded event i got confused. File.

//All files are uploaded?
scope.allUploaded = false;

angular.forEach(scope.plFilesModel, function($file, key) {

  //Bug FIX, this logic will set allUploaded right
  if(file.percent != 100) {
    scope.allUploaded = false;
   } else if(file.id == $file.id) { //If the file is the same that we are reciving...
    //Set response on the file
    $file.response = JSON.parse(res.response);

    //Need throw event? throw it
    if(iAttrs.onFileUploaded) {
      var fn = $parse(iAttrs.onFileUploaded);
      fn(scope.$parent, {$response:res});
    }
  }         
});

My questions are:

• ¿Who puts allUploaded scope variable to true?
• throw event can be outside foreach Fn
• What is the key to set $file.response = JSON.parse(res.response); if $file is just a temp variable.