Improve formatting of error messages

Also run onSuccess function when form completes

lib/api_form.dart

@@ -60,6 +60,8 @@ class APIFormField {
 
   String get helpText => (data['help_text'] ?? '').toString();
 
+  String get placeholderText => (data['placeholder'] ?? '').toString();
+
   // Construct a widget for this input
   Widget constructField() {
     switch (type) {
@@ -81,7 +83,17 @@ class APIFormField {
     return TextFormField(
       decoration: InputDecoration(
         labelText: required ? label + "*" : label,
-        hintText: helpText,
+        labelStyle: TextStyle(
+          fontWeight: FontWeight.bold,
+          fontSize: 22,
+          color: hasErrors() ? Color.fromRGBO(250, 50, 50, 1) : Color.fromRGBO(50, 50, 50, 1),
+        ),
+        helperText: helpText,
+        helperStyle: TextStyle(
+          fontStyle: FontStyle.italic,
+          color: hasErrors() ? Color.fromRGBO(205, 50, 50, 1) : Color.fromRGBO(50, 50, 50, 1),
+        ),
+        hintText: placeholderText,
       ),
       initialValue: value ?? '',
       onSaved: (val) {
@@ -89,7 +101,7 @@ class APIFormField {
       },
       validator: (value) {
         if (required && (value == null || value.isEmpty)) {
-          return L10().valueCannotBeEmpty;
+          // return L10().valueCannotBeEmpty;
         }
       },
     );
@@ -199,7 +211,12 @@ Future<void> launchApiForm(BuildContext context, String title, String url, Map<S
   // Now, launch a new widget!
   Navigator.push(
     context,
-    MaterialPageRoute(builder: (context) => APIFormWidget(title, url, formFields))
+    MaterialPageRoute(builder: (context) => APIFormWidget(
+        title,
+        url,
+        formFields,
+        onSuccess: onSuccess,
+    ))
   );
 }
 
@@ -214,10 +231,20 @@ class APIFormWidget extends StatefulWidget {
 
   final List<APIFormField> fields;
 
-  APIFormWidget(this.title, this.url, this.fields, {Key? key}) : super(key: key);
+  Function? onSuccess;
+
+  APIFormWidget(
+      this.title,
+      this.url,
+      this.fields,
+      {
+        Key? key,
+        this.onSuccess,
+      }
+  ) : super(key: key);
 
   @override
-  _APIFormWidgetState createState() => _APIFormWidgetState(title, url, fields);
+  _APIFormWidgetState createState() => _APIFormWidgetState(title, url, fields, onSuccess);
 
 }
 
@@ -232,7 +259,9 @@ class _APIFormWidgetState extends State<APIFormWidget> {
 
   List<APIFormField> fields;
 
-  _APIFormWidgetState(this.title, this.url, this.fields) : super();
+  Function? onSuccess;
+
+  _APIFormWidgetState(this.title, this.url, this.fields, this.onSuccess) : super();
 
   List<Widget> _buildForm() {
 
@@ -252,7 +281,11 @@ class _APIFormWidgetState extends State<APIFormWidget> {
             ListTile(
               title: Text(
                 error,
-                style: TextStyle(color: Color.fromRGBO(250, 50, 50, 1)),
+                style: TextStyle(
+                  color: Color.fromRGBO(250, 50, 50, 1),
+                  fontStyle: FontStyle.italic,
+                  fontSize: 16,
+                ),
               )
             )
           );
@@ -307,7 +340,12 @@ class _APIFormWidgetState extends State<APIFormWidget> {
 
         // TODO: Display a snackBar
 
-        // TODO: Run custom onSuccess function
+        // Run custom onSuccess function
+        var successFunc = onSuccess;
+
+        if (successFunc != null) {
+          successFunc();
+        }
         return;
       case 400:
         // Form submission / validation error

lib/widget/part_detail.dart

@@ -174,13 +174,6 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
 
   void _editPartDialog(BuildContext context) {
 
-    // Values which can be edited
-    var _name;
-    var _description;
-    var _ipn;
-    var _keywords;
-    var _link;
-
     launchApiForm(
         context,
         L10().editPart,
@@ -196,52 +189,6 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
         modelData: part.jsondata,
         onSuccess: refresh,
     );
-
-    return;
-
-    showFormDialog(L10().editPart,
-      key: _editPartKey,
-      callback: () {
-        _savePart({
-          "name": _name,
-          "description": _description,
-          "IPN": _ipn,
-          "keywords": _keywords,
-          "link": _link
-        });
-      },
-      fields: <Widget>[
-        StringField(
-          label: L10().name,
-          initial: part.name,
-          onSaved: (value) => _name = value,
-        ),
-        StringField(
-          label: L10().description,
-          initial: part.description,
-          onSaved: (value) => _description = value,
-        ),
-        StringField(
-          label: L10().internalPartNumber,
-          initial: part.IPN,
-          allowEmpty: true,
-          onSaved: (value) => _ipn = value,
-        ),
-        StringField(
-          label: L10().keywords,
-          initial: part.keywords,
-          allowEmpty: true,
-          onSaved: (value) => _keywords = value,
-        ),
-        StringField(
-          label: L10().link,
-          initial: part.link,
-          allowEmpty: true,
-          onSaved: (value) => _link = value
-        )
-      ]
-    );
-
   }
 
   Widget headerTile() {