Add ability to edit Part object

lib/api.dart

@@ -270,12 +270,10 @@ class InvenTreeAPI {
 
     print("PATCH: " + _url);
 
-    final response = await http.patch(_url,
+    return http.patch(_url,
       headers: _headers,
       body: _body,
     );
-
-    return response;
   }
 
   // Perform a POST request

lib/inventree/model.dart

@@ -126,6 +126,45 @@ class InvenTreeModel {
     return true;
   }
 
+  // POST data to update the model
+  Future<bool> update(BuildContext context, {Map<String, String> values}) async {
+
+    var addr = path.join(URL, pk.toString());
+
+    if (!addr.endsWith("/")) {
+      addr += "/";
+    }
+
+    showProgressDialog(context, "Updating ${NAME}", "Sending data to server");
+
+    var response = await api.patch(addr, body: values)
+        .timeout(Duration(seconds: 10))
+        .catchError((e) {
+
+          hideProgressDialog(context);
+
+          if (e is TimeoutException) {
+            showErrorDialog(context, "Timeout", "No response from server");
+          } else {
+            showErrorDialog(context, "Error", e.toString());
+          }
+
+          return null;
+    });
+
+    if (response == null) return false;
+
+    hideProgressDialog(context);
+
+    if (response.statusCode != 200) {
+      print("Error updating ${NAME}: Status code ${response.statusCode}");
+      return false;
+    }
+
+    return true;
+
+  }
+
   // Return the detail view for the associated pk
   Future<InvenTreeModel> get(BuildContext context, int pk, {Map<String, String> filters}) async {
 

lib/widget/fields.dart

@@ -3,12 +3,13 @@ import 'package:flutter/material.dart';
 
 class QuantityField extends TextFormField {
 
-  QuantityField({String label = "", String hint = "", double max = null, TextEditingController controller}) :
+  QuantityField({String label = "", String hint = "", String initial = "", double max = null, TextEditingController controller}) :
       super(
         decoration: InputDecoration(
           labelText: label,
           hintText: hint,
         ),
+        initialValue: initial,
         controller: controller,
         keyboardType: TextInputType.numberWithOptions(signed: false, decimal: true),
         validator: (value) {

lib/widget/part_detail.dart

@@ -1,6 +1,7 @@
 
 import 'package:InvenTree/inventree/part.dart';
 import 'package:InvenTree/widget/category_display.dart';
+import 'package:InvenTree/widget/dialogs.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -24,6 +25,8 @@ class PartDetailWidget extends StatefulWidget {
 
 class _PartDisplayState extends RefreshableState<PartDetailWidget> {
 
+  final _editPartKey = GlobalKey<FormState>();
+
   @override
   String getAppBarTitle(BuildContext context) { return "Part"; }
 
@@ -40,6 +43,85 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
     await part.reload(context);
   }
 
+  void _savePart(Map<String, String> values) async {
+
+    Navigator.of(context).pop();
+
+    var response = await part.update(context, values: values);
+
+    refresh();
+  }
+
+  void _editPartDialog() {
+
+    // Values which can be edited
+    var _name;
+    var _description;
+    var _ipn;
+    var _revision;
+
+    showFormDialog(context, "Edit Part",
+      key: _editPartKey,
+      actions: <Widget>[
+        FlatButton(
+          child: Text("Cancel"),
+          onPressed: () {
+            Navigator.pop(context);
+          },
+        ),
+        FlatButton(
+          child: Text("Save"),
+          onPressed: () {
+            if (_editPartKey.currentState.validate()) {
+              _editPartKey.currentState.save();
+
+              _savePart({
+                "name": _name,
+                "description": _description,
+                "IPN": _ipn,
+              });
+            }
+          },
+        ),
+      ],
+      fields: <Widget>[
+        TextFormField(
+          decoration: InputDecoration(
+            labelText: "Part Name",
+            hintText: "Enter part name",
+          ),
+          initialValue: part.name,
+          validator: (value) {
+            if (value.isEmpty) return "Name cannot be empty";
+            return null;
+          },
+          onSaved: (value) => _name = value,
+        ),
+        TextFormField(
+          decoration: InputDecoration(
+            labelText: "Part Description",
+            hintText: "Enter part description",
+          ),
+          initialValue: part.description,
+          validator: (value) {
+            if (value.isEmpty) return "Description cannot be empty";
+            return null;
+          },
+          onSaved: (value) => _description = value,
+        ),
+        TextFormField(
+          decoration: InputDecoration(
+            labelText: "Internal Part Number",
+            hintText: "Enter internal part number",
+          ),
+          initialValue: part.IPN,
+          onSaved: (value) => _ipn = value,
+        )
+      ]
+    );
+
+  }
+
   /*
    * Build a list of tiles to display under the part description
    */
@@ -58,7 +140,7 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
           ),
           trailing: IconButton(
             icon: FaIcon(FontAwesomeIcons.edit),
-            onPressed: null,
+            onPressed: _editPartDialog,
           ),
         )
       )