Display part thumbnail in part list

android/app/build.gradle

@@ -27,6 +27,10 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 android {
     compileSdkVersion 28
 
+    packagingOptions {
+        exclude 'META-INF/proguard/androidx-annotations.pro'
+    }
+
     lintOptions {
         disable 'InvalidPackage'
     }

lib/api.dart

@@ -211,7 +211,7 @@ class InvenTreeAPI {
   Future<http.Response> patch(String url, {Map<String, String> body}) async {
 
     var _url = makeApiUrl(url);
-    var _headers = _defaultHeaders();
+    var _headers = defaultHeaders();
     var _body = Map<String, String>();
 
     // Copy across provided data
@@ -231,7 +231,7 @@ class InvenTreeAPI {
   Future<http.Response> post(String url, {Map<String, String> body}) async {
 
     var _url = makeApiUrl(url);
-    var _headers = _defaultHeaders();
+    var _headers = defaultHeaders();
     var _body = Map<String, String>();
 
     // Copy across provided data
@@ -249,7 +249,7 @@ class InvenTreeAPI {
   Future<http.Response> get(String url, {Map<String, String> params}) async {
 
     var _url = makeApiUrl(url);
-    var _headers = _defaultHeaders();
+    var _headers = defaultHeaders();
 
     // If query parameters are supplied, form a query string
     if (params != null && params.isNotEmpty) {
@@ -270,18 +270,21 @@ class InvenTreeAPI {
     return http.get(_url, headers: _headers);
   }
 
-  Map<String, String> _defaultHeaders() {
+  Map<String, String> defaultHeaders() {
 
     var headers = Map<String, String>();
 
-    // Preference authentication token if available
+    headers[HttpHeaders.authorizationHeader] = _authorizationHeader();
-    if (_token.isNotEmpty) {
+    //headers['Authorization'] = _authorizationHeader();
-      headers[HttpHeaders.authorizationHeader] = "Token " + _token;
-    } else {
-      headers[HttpHeaders.authorizationHeader] = 'Basic ' + base64Encode(utf8.encode('$_username:$_password'));
-    }
 
     return headers;
   }
 
+  String _authorizationHeader () {
+    if (_token.isNotEmpty) {
+      return "Token $_token";
+    } else {
+      return "Basic " + base64Encode(utf8.encode('$_username:$_password'));
+    }
+  }
 }

lib/inventree/part.dart

@@ -1,7 +1,7 @@
 import 'package:InvenTree/api.dart';
 
 import 'model.dart';
-import 'dart:convert';
+import 'dart:io';
 
 import 'package:path/path.dart' as path;
 import 'package:http/http.dart' as http;
@@ -38,6 +38,31 @@ class InvenTreePart extends InvenTreeModel {
 
   String get categoryName => jsondata['category__name'] ?? '';
 
+  String get _image  => jsondata['image'] ?? '';
+
+  String get _thumbnail => jsondata['thumbnail'] ?? '';
+
+  // Return a fully-qualified path to the image for this Part
+  String get image {
+    String img = _image.isNotEmpty ? _image : _thumbnail;
+
+    if (img.isEmpty) {
+      return InvenTreeAPI().makeUrl('/static/img/blank_image.png');
+    } else {
+      return InvenTreeAPI().makeUrl(img);
+    }
+  }
+
+  String get thumbnail {
+    String img = _thumbnail.isNotEmpty ? _thumbnail : _image;
+
+    if (img.isEmpty) {
+      return InvenTreeAPI().makeUrl('/static/img/blank_image.thumbnail.png');
+    } else {
+      return InvenTreeAPI().makeUrl(img);
+    }
+  }
+
   InvenTreePart() : super();
 
   InvenTreePart.fromJson(Map<String, dynamic> json) : super.fromJson(json) {
@@ -50,6 +75,5 @@ class InvenTreePart extends InvenTreeModel {
     var part = InvenTreePart.fromJson(json);
 
     return part;
-
   }
 }

lib/widget/category_display.dart

@@ -1,4 +1,5 @@
 
+import 'package:InvenTree/api.dart';
 import 'package:InvenTree/inventree/part.dart';
 
 import 'package:InvenTree/widget/part_display.dart';
@@ -8,6 +9,8 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
+import 'package:flutter_advanced_networkimage/provider.dart';
+
 class CategoryDisplayWidget extends StatefulWidget {
 
   CategoryDisplayWidget(this.category, {Key key}) : super(key: key);
@@ -176,14 +179,15 @@ class PartList extends StatelessWidget {
     return ListTile(
       title: Text("${part.name}"),
       subtitle: Text("${part.description}"),
-
+      leading: Image(
-      /*
+        image: AdvancedNetworkImage(
-      leading: CachedNetworkImage(
+          part.thumbnail,
-        imageUrl: part.imageurl,
+          header: InvenTreeAPI().defaultHeaders(),
-        placeholder: (context, url) => CircularProgressIndicator(),
+          useDiskCache: true,
-        errorWidget: (context, url, error) => Icon(Icons.error),
+          cacheRule: CacheRule(maxAge: const Duration(days: 1)),
+        ),
+        width: 48,
       ),
-      */
       onTap: () {
         _openPart(context, part.pk);
       },

pubspec.lock

@@ -69,6 +69,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_advanced_networkimage:
+    dependency: "direct main"
+    description:
+      name: flutter_advanced_networkimage
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.7.0"
   flutter_launcher_icons:
     dependency: "direct dev"
     description:
@@ -76,6 +83,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.7.4"
+  flutter_svg:
+    dependency: transitive
+    description:
+      name: flutter_svg
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.17.3+1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -135,6 +149,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.6.4"
+  path_drawing:
+    dependency: transitive
+    description:
+      name: path_drawing
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.4.1"
+  path_parsing:
+    dependency: transitive
+    description:
+      name: path_parsing
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.4"
+  path_provider:
+    dependency: transitive
+    description:
+      name: path_provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.6.5"
+  path_provider_macos:
+    dependency: transitive
+    description:
+      name: path_provider_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   pedantic:
     dependency: transitive
     description:
@@ -149,6 +198,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.4.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.1"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.2"
   preferences:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -26,6 +26,8 @@ dependencies:
   http: ^0.12.0+2
   shared_preferences: ^0.5.3+1
 
+  flutter_advanced_networkimage: any
+
   preferences: ^5.1.0
 
   qr_utils: ^0.1.4