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angular-metor 教程第 16 步

$scope.map = {
      center: {
        latitude: 45,
        longitude: -73
      },
      zoom: 8,
      events: {
        click: function (mapModel, eventName, originalEventArgs) {
          if (!$scope.party)
            return;

          if (!$scope.party.location)
            $scope.party.location = {};

          $scope.party.location.latitude = originalEventArgs[0].latLng.lat();
          $scope.party.location.longitude = originalEventArgs[0].latLng.lng();
          //scope apply required because this event handler is outside of the angular domain
          $scope.$apply();
        }
      },
      marker: {
        options: { draggable: true },
        events: {
          dragend: function (marker, eventName, args) {
            if (!$scope.party.location)
              $scope.party.location = {};

            $scope.party.location.latitude = marker.getPosition().lat();
            $scope.party.location.longitude = marker.getPosition().lng();
          }
        }
      }
    };

为什么我们不需要$scope.$apply();在 marker.events.dragend 函数的末尾调用，但我们需要$scope.$apply();在 events.click 函数的末尾调用？

请注意，我知道我们需要$scope.$apply();在 events.click 函数的末尾调用，因为此回调由 Google Map API 调用。marker.events.dragend 函数不是 Google Map API 也会调用的回调吗？

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