Stock display (#379)

* Display stock quantity more prominently

* Cleanup search widget

* Update for stock_detail widget

* More tweaks

* Change bottom bar icon

* Display boolean parameters appropriately

* Adds ability to edit part parameters

* Bump icon size a bit

* Improvements to filter options

- Allow filtering by "option" type
- To start with, filter stock by status code

* Remove debug message

* Remove getTriState method

- No longer needed
- Remove associated unit tests

* Adjust filters based on server API version

* Muted colors

lib/api_form.dart

@@ -275,6 +275,7 @@ class APIFormField {
 
   // Construct a widget for this input
   Widget constructField(BuildContext context) {
+
     switch (type) {
       case "string":
       case "url":
@@ -696,6 +697,14 @@ class APIFormField {
   // Construct a string input element
   Widget _constructString() {
 
+    if (readOnly) {
+      return ListTile(
+        title: Text(label),
+        subtitle: Text(helpText),
+        trailing: Text(value.toString()),
+      );
+    }
+
     return TextFormField(
       decoration: InputDecoration(
         labelText: required ? label + "*" : label,
@@ -724,12 +733,21 @@ class APIFormField {
   // Construct a boolean input element
   Widget _constructBoolean() {
 
+    bool? initial_value;
+
+    if (value is bool || value == null) {
+      initial_value = value as bool?;
+    } else {
+      String vs = value.toString().toLowerCase();
+      initial_value = ["1", "true", "yes"].contains(vs);
+    }
+
     return CheckBoxField(
       label: label,
       labelStyle: _labelStyle(),
       helperText: helpText,
       helperStyle: _helperStyle(),
-      initial: value as bool?,
+      initial: initial_value,
       tristate: (getParameter("tristate") ?? false) as bool,
       onSaved: (val) {
         data["value"] = val;
@@ -1262,6 +1280,10 @@ class _APIFormWidgetState extends State<APIFormWidget> {
 
     for (var field in widget.fields) {
 
+      if (field.readOnly) {
+        continue;
+      }
+
       if (field.isSimple) {
         // Simple top-level field data
         data[field.name] = field.data["value"];