Part detail view is now refreshabel

- lso add a progress dialog when reloading a model object

lib/widget/part_detail.dart

@@ -6,6 +6,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 import 'package:InvenTree/api.dart';
+import 'package:InvenTree/widget/refreshable_state.dart';
 import 'package:InvenTree/widget/drawer.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
@@ -21,7 +22,10 @@ class PartDetailWidget extends StatefulWidget {
 }
 
 
-class _PartDisplayState extends State<PartDetailWidget> {
+class _PartDisplayState extends RefreshableState<PartDetailWidget> {
+
+  @override
+  String app_bar_title = "Part";
 
   _PartDisplayState(this.part) {
     // TODO
@@ -29,6 +33,11 @@ class _PartDisplayState extends State<PartDetailWidget> {
 
   InvenTreePart part;
 
+  @override
+  Future<void> request(BuildContext context) async {
+    await part.reload(context);
+  }
+
   /*
    * Build a list of tiles to display under the part description
    */
@@ -154,22 +163,11 @@ class _PartDisplayState extends State<PartDetailWidget> {
   }
 
   @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: Text("Part Details"),
+  Widget getBody(BuildContext context) {
+    return Center(
+      child: ListView(
+        children: partTiles(),
       ),
-      drawer: new InvenTreeDrawer(context),
-      floatingActionButton: FloatingActionButton(
-        child: FaIcon(FontAwesomeIcons.ellipsisH),
-        // TODO - Add pop-up icons
-        // Ref: https://stackoverflow.com/questions/46480221/flutter-floating-action-button-with-speed-dial#46480722
-      ),
-      body: Center(
-        child: ListView(
-          children: partTiles(),
-        ),
-      )
     );
   }
 }