Update package versions and refactor accordingly

lib/widget/dialogs.dart

@@ -1,7 +1,7 @@
 
 import 'package:InvenTree/app_settings.dart';
 import 'package:InvenTree/widget/snacks.dart';
-import 'package:audioplayers/audio_cache.dart';
+import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
@@ -64,7 +64,7 @@ Future<void> showInfoDialog(BuildContext context, String title, String descripti
 
   showDialog(
     context: context,
-    child: SimpleDialog(
+    builder: (BuildContext context) => SimpleDialog(
       title: ListTile(
         title: Text(info),
         leading: FaIcon(icon),
@@ -119,7 +119,7 @@ Future<void> showServerError(String title, String description) async {
   final bool tones = await InvenTreeSettingsManager().getValue("serverSounds", true) as bool;
 
   if (tones) {
-    AudioCache player = AudioCache();
+    final player = AudioCache();
     player.play("sounds/server_error.mp3");
   }
 

lib/widget/fields.dart

@@ -28,24 +28,28 @@ class ImagePickerField extends FormField<File> {
   }
 
   static Future<void> _getImageFromGallery(FormFieldState<File> field) async {
-    
-    File image;
-    
-    await ImagePicker.pickImage(source: ImageSource.gallery).then((File img) {
-      image = img;
-    });
 
-    field.didChange(image);
+    final picker = ImagePicker();
+
+    final pickedImage = await picker.getImage(source: ImageSource.gallery);
+
+    if (pickedImage != null)
+    {
+      field.didChange(File(pickedImage.path));
+    }
   }
 
   static Future<void> _getImageFromCamera(FormFieldState<File> field) async {
-    File image;
 
-    await ImagePicker.pickImage(source: ImageSource.camera).then((File img) {
-      image = img;
-    });
+    final picker = ImagePicker();
+
+    final pickedImage = await picker.getImage(source: ImageSource.camera);
+
+    if (pickedImage != null)
+    {
+        field.didChange(File(pickedImage.path));
+    }
 
-    field.didChange(image);
   }
 
   ImagePickerField(BuildContext context, {String label = "Attach Image", Function onSaved, bool required = false}) :

lib/widget/part_detail.dart

@@ -34,6 +34,7 @@ class PartDetailWidget extends StatefulWidget {
 
 class _PartDisplayState extends RefreshableState<PartDetailWidget> {
 
+  final _editImageKey = GlobalKey<FormState>();
   final _editPartKey = GlobalKey<FormState>();
 
   @override
@@ -116,6 +117,39 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
     refresh();
   }
 
+  void _uploadImage(File image) async {
+
+    print("Uploading image...");
+    await part.uploadImage(image);
+    print("Done");
+
+    refresh();
+  }
+
+  void _selectImage() {
+
+    File _attachment;
+
+    if (!InvenTreeAPI().checkPermission('part', 'change')) {
+      return;
+    }
+
+    showFormDialog(L10().selectImage,
+      key: _editImageKey,
+      callback: () {
+        _uploadImage(_attachment);
+      },
+      fields: <Widget>[
+        ImagePickerField(
+          context,
+          label: L10().attachImage,
+          required: true,
+          onSaved: (attachment) => _attachment = attachment,
+        ),
+      ]
+    );
+  }
+
   void _editPartDialog() {
 
     // Values which can be edited
@@ -189,6 +223,7 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
                 MaterialPageRoute(builder: (context) => FullScreenWidget(part.fullname, part.image))
               );
             }),
+            onLongPress: _selectImage,
         ),
     );
   }