Added Statistics calculation

Statistics now show calculated values

node_modules/@mui/x-date-pickers/esm/internals/hooks/useField/useFieldHiddenInputProps.js

@@ -0,0 +1,31 @@
+import * as React from 'react';
+import useEventCallback from '@mui/utils/useEventCallback';
+/**
+ * Generate the props to pass to the hidden input element of the field.
+ * It is not used by the non-accessible DOM structure (with an <input /> element for editing).
+ * It should be used in the MUI accessible DOM structure and the Base UI implementation.
+ * @param {UseFieldHiddenInputPropsParameters} parameters The parameters of the hook.
+ * @returns {UseFieldHiddenInputPropsReturnValue} The props to forward to the hidden input element of the field.
+ */
+export function useFieldHiddenInputProps(parameters) {
+  const {
+    manager: {
+      internal_fieldValueManager: fieldValueManager
+    },
+    stateResponse: {
+      // States and derived states
+      areAllSectionsEmpty,
+      state,
+      // Methods to update the states
+      updateValueFromValueStr
+    }
+  } = parameters;
+  const handleChange = useEventCallback(event => {
+    updateValueFromValueStr(event.target.value);
+  });
+  const valueStr = React.useMemo(() => areAllSectionsEmpty ? '' : fieldValueManager.getV7HiddenInputValueFromSections(state.sections), [areAllSectionsEmpty, state.sections, fieldValueManager]);
+  return {
+    value: valueStr,
+    onChange: handleChange
+  };
+}