Hide actions if user does not have correct permissions

lib/widget/category_display.dart

@@ -62,7 +62,7 @@ class _CategoryDisplayState extends RefreshableState<CategoryDisplayWidget> {
         )
     );
 
-    if (category != null) {
+    if ((category != null) && InvenTreeAPI().checkPermission('part_category', 'change')) {
       actions.add(
         IconButton(
           icon: FaIcon(FontAwesomeIcons.edit),

lib/widget/location_display.dart

@@ -62,7 +62,7 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
       ),
     );
 
-    if (location != null) {
+    if ((location != null) && (InvenTreeAPI().checkPermission('stock_location', 'change'))) {
       actions.add(
         IconButton(
           icon: FaIcon(FontAwesomeIcons.edit),
@@ -320,22 +320,29 @@ List<Widget> detailTiles() {
 
     tiles.add(locationDescriptionCard());
 
+    // Stock adjustment actions
+    if (InvenTreeAPI().checkPermission('stock', 'change')) {
       // Scan items into location
       tiles.add(
           ListTile(
-        title: Text(I18N.of(context).barcodeScanInItems),
+            title: Text(I18N
+                .of(context)
+                .barcodeScanInItems),
             leading: FaIcon(FontAwesomeIcons.exchangeAlt),
             trailing: FaIcon(FontAwesomeIcons.qrcode),
             onTap: () {
               Navigator.push(
                   context,
-            MaterialPageRoute(builder: (context) => InvenTreeQRView(StockLocationScanInItemsHandler(location)))
+                  MaterialPageRoute(builder: (context) =>
+                      InvenTreeQRView(
+                          StockLocationScanInItemsHandler(location)))
               ).then((context) {
                 refresh();
               });
             },
           )
       );
+    }
 
     // Move location into another location
     // TODO: Implement this!

lib/widget/part_detail.dart

@@ -41,18 +41,29 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
 
   @override
   List<Widget> getAppBarActions(BuildContext context) {
-    return <Widget>[
+
+    List<Widget> actions = [];
+
+    if (InvenTreeAPI().checkPermission('part', 'view')) {
+      actions.add(
         IconButton(
           icon: FaIcon(FontAwesomeIcons.globe),
           onPressed: _openInvenTreePage,
         ),
-      // TODO: Hide the 'edit' button if the user does not have permission!!
+      );
+    }
+
+    if (InvenTreeAPI().checkPermission('part', 'change')) {
+      actions.add(
         IconButton(
           icon: FaIcon(FontAwesomeIcons.edit),
           tooltip: I18N.of(context).edit,
           onPressed: _editPartDialog,
         )
-    ];
+      );
+    }
+
+    return actions;
   }
 
   _PartDisplayState(this.part) {
@@ -82,9 +93,12 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
   }
 
   void _toggleStar() async {
+
+    if (InvenTreeAPI().checkPermission('part', 'change')) {
       await part.update(context, values: {"starred": "${!part.starred}"});
       refresh();
     }
+  }
 
   void _savePart(Map<String, String> values) async {
 

lib/widget/stock_detail.dart

@@ -140,10 +140,9 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   void _stockUpdateMessage(bool result) {
 
-    showSnackIcon(
+    if (result) {
-      result ? "Stock item updated" : "Stock item updated failed",
+      showSnackIcon("Stock item updated", success: true);
-      success: result
+    }
-    );
   }
 
   void _removeStock() async {
@@ -514,6 +513,24 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
     tiles.add(headerTile());
 
+    // First check that the user has the required permissions to adjust stock
+    if (!InvenTreeAPI().checkPermission('stock', 'change')) {
+      tiles.add(
+        ListTile(
+          title: Text("Permission Required"),
+          leading: FaIcon(FontAwesomeIcons.userTimes)
+        )
+      );
+
+      tiles.add(
+        ListTile(
+          subtitle: Text("Your account does not have permission to perform stock adjustments"),
+        )
+      );
+
+      return tiles;
+    }
+
     if (!item.isSerialized()) {
       tiles.add(
           ListTile(