Refactor part image widget

- Separate buttons to upload image from gallery or camera

lib/widget/part_image_widget.dart

@@ -0,0 +1,103 @@
+import 'dart:io';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:image_picker/image_picker.dart';
+
+import 'package:inventree/api.dart';
+
+import 'package:font_awesome_flutter/font_awesome_flutter.dart';
+import 'package:inventree/inventree/part.dart';
+import 'package:inventree/widget/refreshable_state.dart';
+
+class PartImageWidget extends StatefulWidget {
+
+  PartImageWidget(this.part, {Key? key}) : super(key: key);
+
+  final InvenTreePart part;
+
+  @override
+  _PartImageState createState() => _PartImageState(part);
+
+}
+
+
+class _PartImageState extends RefreshableState<PartImageWidget> {
+
+  _PartImageState(this.part);
+
+  final InvenTreePart part;
+
+  @override
+  Future<void> request() async {
+    await part.reload();
+  }
+
+  void uploadFromGallery() async {
+
+    final picker = ImagePicker();
+
+    final pickedImage = await picker.getImage(source: ImageSource.gallery);
+
+    if (pickedImage != null) {
+      File? img = File(pickedImage.path);
+
+      await part.uploadImage(img);
+
+      refresh();
+    }
+  }
+
+  void uploadFromCamera() async {
+
+    final picker = ImagePicker();
+
+    final pickedImage = await picker.getImage(source: ImageSource.camera);
+
+    if (pickedImage != null) {
+      File? img = File(pickedImage.path);
+
+      await part.uploadImage(img);
+
+      refresh();
+    }
+
+  }
+
+  @override
+  String getAppBarTitle(BuildContext context) => part.fullname;
+
+  @override
+  List<Widget> getAppBarActions(BuildContext context) {
+
+    List<Widget> actions = [];
+
+    if (InvenTreeAPI().checkPermission('part', 'change')) {
+
+      // File upload
+      actions.add(
+        IconButton(
+          icon: FaIcon(FontAwesomeIcons.fileImage),
+          onPressed: uploadFromGallery,
+        )
+      );
+
+      // Camera upload
+      actions.add(
+        IconButton(
+          icon: FaIcon(FontAwesomeIcons.camera),
+          onPressed: uploadFromCamera,
+        )
+      );
+    }
+
+    return actions;
+  }
+
+  @override
+  Widget getBody(BuildContext context) {
+    return InvenTreeAPI().getImage(part.image);
+  }
+
+}