Add support for "modern" stock actions via the API

- In the future, will have to deprecate support for the old ways
- Probably v0.6.x?

lib/api.dart

@@ -225,6 +225,8 @@ class InvenTreeAPI {
   // API version of the connected server
   int _apiVersion = 1;
 
+  int get apiVersion => _apiVersion;
+
   // Getter for server version information
   String get version => _version;
 
@@ -244,10 +246,14 @@ class InvenTreeAPI {
   // Ensure we only ever create a single instance of the API class
   static final InvenTreeAPI _api = InvenTreeAPI._internal();
 
+  // API endpoint for receiving purchase order line items was introduced in v12
   bool supportPoReceive() {
+    return apiVersion >= 12;
+  }
 
-    // API endpoint for receiving purchase order line items was introduced in v12
+  // "Modern" API transactions were implemented in API v14
-    return _apiVersion >= 12;
+  bool supportModernStockTransactions() {
+    return apiVersion >= 14;
   }
 
   /*

lib/inventree/stock.dart

@@ -115,6 +115,16 @@ class InvenTreeStockItem extends InvenTreeModel {
   @override
   String get URL => "stock/";
 
+  // URLs for performing stock actions
+
+  static String transferStockUrl() => "stock/transfer/";
+
+  static String countStockUrl() => "stock/count/";
+
+  static String addStockUrl() => "stock/add/";
+
+  static String removeStockUrl() => "stock/remove/";
+
   @override
   String get WEB_URL => "stock/item/";
 
@@ -474,7 +484,7 @@ class InvenTreeStockItem extends InvenTreeModel {
     return response.isValid();
   }
 
-  // TODO: Refactor this once the server supports API metadata for this action
+  // TODO: Remove this function when we deprecate support for the old API
   Future<bool> countStock(BuildContext context, double q, {String? notes}) async {
 
     final bool result = await adjustStock(context, "/stock/count/", q, notes: notes);
@@ -482,7 +492,7 @@ class InvenTreeStockItem extends InvenTreeModel {
     return result;
   }
 
-  // TODO: Refactor this once the server supports API metadata for this action
+  // TODO: Remove this function when we deprecate support for the old API
   Future<bool> addStock(BuildContext context, double q, {String? notes}) async {
 
     final bool result = await adjustStock(context,  "/stock/add/", q, notes: notes);
@@ -490,7 +500,7 @@ class InvenTreeStockItem extends InvenTreeModel {
     return result;
   }
 
-  // TODO: Refactor this once the server supports API metadata for this action
+  // TODO: Remove this function when we deprecate support for the old API
   Future<bool> removeStock(BuildContext context, double q, {String? notes}) async {
 
     final bool result = await adjustStock(context, "/stock/remove/", q, notes: notes);
@@ -498,7 +508,7 @@ class InvenTreeStockItem extends InvenTreeModel {
     return result;
   }
 
-  // TODO: Refactor this once the server supports API metadata for this action
+  // TODO: Remove this function when we deprecate support for the old API
   Future<bool> transferStock(int location, {double? quantity, String? notes}) async {
     if ((quantity == null) || (quantity < 0) || (quantity > this.quantity)) {
       quantity = this.quantity;

lib/widget/stock_detail.dart

@@ -1,3 +1,9 @@
+import "package:flutter/cupertino.dart";
+import "package:flutter/material.dart";
+
+import "package:dropdown_search/dropdown_search.dart";
+import "package:font_awesome_flutter/font_awesome_flutter.dart";
+
 import "package:inventree/app_colors.dart";
 import "package:inventree/barcode.dart";
 import "package:inventree/inventree/model.dart";
@@ -12,15 +18,11 @@ import "package:inventree/widget/refreshable_state.dart";
 import "package:inventree/widget/snacks.dart";
 import "package:inventree/widget/stock_item_test_results.dart";
 import "package:inventree/widget/stock_notes.dart";
-import "package:flutter/cupertino.dart";
-import "package:flutter/material.dart";
-
 import "package:inventree/l10.dart";
 import "package:inventree/helpers.dart";
 import "package:inventree/api.dart";
+import "package:inventree/api_form.dart";
 
-import "package:dropdown_search/dropdown_search.dart";
-import "package:font_awesome_flutter/font_awesome_flutter.dart";
 
 class StockDetailWidget extends StatefulWidget {
 
@@ -140,6 +142,39 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   Future <void> _addStockDialog() async {
 
+    // TODO: In future, deprecate support for older API
+    if (InvenTreeAPI().supportModernStockTransactions()) {
+
+      Map<String, dynamic> fields = {
+        "pk": {
+          "parent": "items",
+          "nested": true,
+          "hidden": true,
+          "value": item.pk,
+        },
+        "quantity": {
+          "parent": "items",
+          "nested": true,
+          "value": 0,
+        },
+        "notes": {},
+      };
+
+      launchApiForm(
+        context,
+        L10().addStock,
+        InvenTreeStockItem.addStockUrl(),
+        fields,
+        method: "POST",
+        icon: FontAwesomeIcons.plusCircle,
+        onSuccess: (data) async {
+          refresh();
+        }
+      );
+
+      return;
+    }
+
     _quantityController.clear();
     _notesController.clear();
 
@@ -186,6 +221,38 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   void _removeStockDialog() {
 
+    // TODO: In future, deprecate support for the older API
+    if (InvenTreeAPI().supportModernStockTransactions()) {
+      Map<String, dynamic> fields = {
+        "pk": {
+          "parent": "items",
+          "nested": true,
+          "hidden": true,
+          "value": item.pk,
+        },
+        "quantity": {
+          "parent": "items",
+          "nested": true,
+          "value": 0,
+        },
+        "notes": {},
+      };
+
+      launchApiForm(
+          context,
+          L10().addStock,
+          InvenTreeStockItem.removeStockUrl(),
+          fields,
+          method: "POST",
+          icon: FontAwesomeIcons.minusCircle,
+          onSuccess: (data) async {
+            refresh();
+          }
+      );
+
+      return;
+    }
+
     _quantityController.clear();
     _notesController.clear();
 
@@ -225,6 +292,39 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   Future <void> _countStockDialog() async {
 
+    // TODO: In future, deprecate support for older API
+    if (InvenTreeAPI().supportModernStockTransactions()) {
+
+      Map<String, dynamic> fields = {
+        "pk": {
+          "parent": "items",
+          "nested": true,
+          "hidden": true,
+          "value": item.pk,
+        },
+        "quantity": {
+          "parent": "items",
+          "nested": true,
+          "value": item.quantity,
+        },
+        "notes": {},
+      };
+
+      launchApiForm(
+          context,
+          L10().addStock,
+          InvenTreeStockItem.countStockUrl(),
+          fields,
+          method: "POST",
+          icon: FontAwesomeIcons.plusCircle,
+          onSuccess: (data) async {
+            refresh();
+          }
+      );
+
+      return;
+    }
+
     _quantityController.text = item.quantity.toString();
     _notesController.clear();
 
@@ -271,6 +371,7 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
   }
 
 
+  // TODO: Delete this function once support for old API is deprecated
   Future <void> _transferStock(int locationId) async {
 
     double quantity = double.tryParse(_quantityController.text) ?? item.quantity;
@@ -288,8 +389,45 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
     }
   }
 
+  /*
+   * Launches an API Form to transfer this stock item to a new location
+   */
   Future <void> _transferStockDialog(BuildContext context) async {
 
+    // TODO: In future, deprecate support for older API
+    if (InvenTreeAPI().supportModernStockTransactions()) {
+
+      Map<String, dynamic> fields = {
+        "pk": {
+          "parent": "items",
+          "nested": true,
+          "hidden": true,
+          "value": item.pk,
+        },
+        "quantity": {
+          "parent": "items",
+          "nested": true,
+          "value": item.quantity,
+        },
+        "location": {},
+        "notes": {},
+      };
+
+      launchApiForm(
+          context,
+          L10().transferStock,
+          InvenTreeStockItem.transferStockUrl(),
+          fields,
+          method: "POST",
+          icon: FontAwesomeIcons.dolly,
+          onSuccess: (data) async {
+            refresh();
+          }
+      );
+
+      return;
+    }
+
     int? location_pk;
 
     _quantityController.text = "${item.quantity}";