Label print updates (#399)

* Allow download of printed label

* Add setting for controlling label printing

* Control display of label printing via setting

* Refactor label printing functionality

- Move to helpers.dart
- Will be used for other label types also

* Factor out request for label templates

* Add label printing support for part

* Support label printing for stock location

* update release notes

lib/helpers.dart

@@ -9,6 +9,7 @@
 
 import "dart:io";
 import "package:currency_formatter/currency_formatter.dart";
+
 import "package:one_context/one_context.dart";
 import "package:url_launcher/url_launcher.dart";
 import "package:audioplayers/audioplayers.dart";
@@ -132,4 +133,5 @@ String renderCurrency(double? amount, String currency, {int decimals = 2}) {
   }
 
   return value;
-}
+}
+

lib/l10n/app_en.arb

@@ -533,6 +533,12 @@
   "keywords": "Keywords",
   "@keywords": {},
 
+  "labelPrinting": "Label Printing",
+  "@labelPrinting": {},
+
+  "labelPrintingDetail": "Enable label printing",
+  "@labelPrintingDetail": {},
+
   "labelTemplate": "Label Template",
   "@labelTemplate": {},
 

lib/labels.dart

@@ -0,0 +1,155 @@
+import "package:flutter/cupertino.dart";
+import "package:font_awesome_flutter/font_awesome_flutter.dart";
+import "package:inventree/api.dart";
+import "package:inventree/widget/progress.dart";
+import "package:inventree/api_form.dart";
+import "package:inventree/l10.dart";
+import "package:inventree/widget/snacks.dart";
+
+/*
+ * Discover which label templates are available for a given item
+ */
+Future<List<Map<String, dynamic>>> getLabelTemplates(
+  String labelType,
+  Map<String, String> data,
+) async {
+
+  if (!InvenTreeAPI().isConnected() || !InvenTreeAPI().supportsMixin("labels")) {
+    return [];
+  }
+
+  // Filter by active plugins
+  data["enabled"] = "true";
+
+  List<Map<String, dynamic>> labels = [];
+
+  await InvenTreeAPI().get(
+    "/label/${labelType}/",
+    params: data,
+  ).then((APIResponse response) {
+    if (response.isValid() && response.statusCode == 200) {
+      for (var label in response.resultsList()) {
+        if (label is Map<String, dynamic>) {
+          labels.add(label);
+        }
+      }
+    }
+  });
+
+  return labels;
+}
+
+
+/*
+ * Select a particular label, from a provided list of options,
+ * and print against the selected instances.
+ */
+Future<void> selectAndPrintLabel(
+    BuildContext context,
+    List<Map<String, dynamic>> labels,
+    String labelType,
+    String labelQuery,
+    ) async {
+
+  if (!InvenTreeAPI().isConnected()) {
+    return;
+  }
+
+  // Find a list of available plugins which support label printing
+  var plugins = InvenTreeAPI().getPlugins(mixin: "labels");
+
+  dynamic initial_label;
+  dynamic initial_plugin;
+
+  List<Map<String, dynamic>> label_options = [];
+  List<Map<String, dynamic>> plugin_options = [];
+
+  // Construct list of available label templates
+  for (var label in labels) {
+    String display_name = (label["description"] ?? "").toString();
+    int pk = (label["pk"] ?? -1) as int;
+
+    if (display_name.isNotEmpty && pk > 0) {
+      label_options.add({
+        "display_name": display_name,
+        "value": pk,
+      });
+    }
+  }
+
+  if (label_options.length == 1) {
+    initial_label = label_options.first["value"];
+  }
+
+  // Construct list of available plugins
+  for (var plugin in plugins) {
+    plugin_options.add({
+      "display_name": plugin.humanName,
+      "value": plugin.key
+    });
+  }
+
+  if (plugin_options.length == 1) {
+    initial_plugin = plugin_options.first["value"];
+  }
+
+  Map<String, dynamic> fields = {
+    "label": {
+      "label": L10().labelTemplate,
+      "type": "choice",
+      "value": initial_label,
+      "choices": label_options,
+      "required": true,
+    },
+    "plugin": {
+      "label": L10().pluginPrinter,
+      "type": "choice",
+      "value": initial_plugin,
+      "choices": plugin_options,
+      "required": true,
+    }
+  };
+
+  launchApiForm(
+    context,
+    L10().printLabel,
+    "",
+    fields,
+    icon: FontAwesomeIcons.print,
+    onSuccess: (Map<String, dynamic> data) async {
+      int labelId = (data["label"] ?? -1) as int;
+      String pluginKey = (data["plugin"] ?? "") as String;
+
+      if (labelId != -1 && pluginKey.isNotEmpty) {
+        String url = "/label/${labelType}/${labelId}/print/?${labelQuery}&plugin=${pluginKey}";
+
+        showLoadingOverlay(context);
+
+        InvenTreeAPI().get(url).then((APIResponse response) {
+          hideLoadingOverlay();
+          if (response.isValid() && response.statusCode == 200) {
+
+            var data = response.asMap();
+
+            if (data.containsKey("file")) {
+              var label_file = (data["file"] ?? "") as String;
+
+              // Attempt to open remote file
+              InvenTreeAPI().downloadFile(label_file);
+            } else {
+              showSnackIcon(
+                  L10().printLabelSuccess,
+                  success: true
+              );
+            }
+          } else {
+            showSnackIcon(
+              L10().printLabelFailure,
+              success: false,
+            );
+          }
+        });
+      }
+    },
+  );
+}

lib/preferences.dart

@@ -25,6 +25,8 @@ const int SCREEN_ORIENTATION_LANDSCAPE = 2;
 const String INV_SOUNDS_BARCODE = "barcodeSounds";
 const String INV_SOUNDS_SERVER = "serverSounds";
 
+const String INV_ENABLE_LABEL_PRINTING = "enableLabelPrinting";
+
 // Part settings
 const String INV_PART_SHOW_PARAMETERS = "partShowParameters";
 const String INV_PART_SHOW_BOM = "partShowBom";

lib/settings/app_settings.dart

@@ -1,18 +1,18 @@
 import "package:flutter/material.dart";
+import "package:one_context/one_context.dart";
 
 import "package:adaptive_theme/adaptive_theme.dart";
 import "package:font_awesome_flutter/font_awesome_flutter.dart";
 import "package:flutter_localized_locales/flutter_localized_locales.dart";
-import "package:inventree/app_colors.dart";
-import "package:inventree/widget/dialogs.dart";
-import "package:one_context/one_context.dart";
 
+import "package:inventree/app_colors.dart";
 import "package:inventree/api_form.dart";
 import "package:inventree/l10.dart";
 import "package:inventree/l10n/supported_locales.dart";
 import "package:inventree/main.dart";
 import "package:inventree/preferences.dart";
 
+import "package:inventree/widget/dialogs.dart";
 import "package:inventree/widget/progress.dart";
 
 
@@ -33,7 +33,7 @@ class _InvenTreeAppSettingsState extends State<InvenTreeAppSettingsWidget> {
 
   bool reportErrors = true;
   bool strictHttps = false;
-
+  bool enableLabelPrinting = true;
   bool darkMode = false;
 
   int screenOrientation = SCREEN_ORIENTATION_SYSTEM;
@@ -56,6 +56,7 @@ class _InvenTreeAppSettingsState extends State<InvenTreeAppSettingsWidget> {
     reportErrors = await InvenTreeSettingsManager().getValue(INV_REPORT_ERRORS, true) as bool;
     strictHttps = await InvenTreeSettingsManager().getValue(INV_STRICT_HTTPS, false) as bool;
     screenOrientation = await InvenTreeSettingsManager().getValue(INV_SCREEN_ORIENTATION, SCREEN_ORIENTATION_SYSTEM) as int;
+    enableLabelPrinting = await InvenTreeSettingsManager().getValue(INV_ENABLE_LABEL_PRINTING, true) as bool;
 
     darkMode = AdaptiveTheme.of(context).mode.isDark;
 
@@ -218,6 +219,20 @@ class _InvenTreeAppSettingsState extends State<InvenTreeAppSettingsWidget> {
                 );
               },
             ),
+            ListTile(
+              title: Text(L10().labelPrinting),
+              subtitle: Text(L10().labelPrintingDetail),
+              leading: FaIcon(FontAwesomeIcons.print),
+              trailing: Switch(
+                value: enableLabelPrinting,
+                onChanged: (bool value) {
+                  InvenTreeSettingsManager().setValue(INV_ENABLE_LABEL_PRINTING, value);
+                  setState(() {
+                    enableLabelPrinting = value;
+                  });
+                }
+              ),
+            ),
             ListTile(
               title: Text(L10().strictHttps),
               subtitle: Text(L10().strictHttpsDetails),

lib/settings/settings.dart

@@ -13,8 +13,8 @@ import "package:inventree/settings/login.dart";
 import "package:inventree/settings/part_settings.dart";
 
 
+// InvenTree settings view
 class InvenTreeSettingsWidget extends StatefulWidget {
-  // InvenTree settings view
 
   @override
   _InvenTreeSettingsState createState() => _InvenTreeSettingsState();

lib/widget/location_display.dart

@@ -8,6 +8,7 @@ import "package:inventree/barcode/barcode.dart";
 import "package:inventree/l10.dart";
 
 import "package:inventree/inventree/stock.dart";
+import "package:inventree/preferences.dart";
 
 import "package:inventree/widget/location_list.dart";
 import "package:inventree/widget/progress.dart";
@@ -15,6 +16,7 @@ import "package:inventree/widget/refreshable_state.dart";
 import "package:inventree/widget/snacks.dart";
 import "package:inventree/widget/stock_detail.dart";
 import "package:inventree/widget/stock_list.dart";
+import "package:inventree/labels.dart";
 
 
 /*
@@ -38,6 +40,10 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
 
   final InvenTreeStockLocation? location;
 
+  bool allowLabelPrinting = true;
+
+  List<Map<String, dynamic>> labels = [];
+
   @override
   String getAppBarTitle() {
     return L10().stockLocation;
@@ -163,6 +169,23 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
       );
     }
 
+    if (widget.location != null && allowLabelPrinting && labels.isNotEmpty) {
+      actions.add(
+          SpeedDialChild(
+              child: FaIcon(FontAwesomeIcons.print),
+              label: L10().printLabel,
+              onTap: () async {
+                selectAndPrintLabel(
+                    context,
+                    labels,
+                    "location",
+                    "location=${widget.location!.pk}"
+                );
+              }
+          )
+      );
+    }
+
     return actions;
   }
 
@@ -202,6 +225,19 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
       }
     }
 
+    allowLabelPrinting = await InvenTreeSettingsManager().getBool(INV_ENABLE_LABEL_PRINTING, true);
+    allowLabelPrinting &= api.getPlugins(mixin: "labels").isNotEmpty;
+
+    if (allowLabelPrinting) {
+      labels.clear();
+
+      if (widget.location != null) {
+        labels = await getLabelTemplates("location", {
+          "location": widget.location!.pk.toString()
+        });
+      }
+    }
+
     if (mounted) {
       setState(() {});
     }

lib/widget/part_detail.dart

@@ -11,6 +11,7 @@ import "package:inventree/helpers.dart";
 import "package:inventree/inventree/bom.dart";
 import "package:inventree/inventree/part.dart";
 import "package:inventree/inventree/stock.dart";
+import "package:inventree/labels.dart";
 import "package:inventree/preferences.dart";
 
 import "package:inventree/widget/attachment_widget.dart";
@@ -54,17 +55,16 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
   int parameterCount = 0;
 
   bool showParameters = false;
-
   bool showBom = false;
+  bool allowLabelPrinting = true;
 
   int attachmentCount = 0;
-
   int bomCount = 0;
-
   int usedInCount = 0;
-
   int variantCount = 0;
 
+  List<Map<String, dynamic>> labels = [];
+
   @override
   String getAppBarTitle() => L10().partDetails;
 
@@ -110,12 +110,29 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
     List<SpeedDialChild> actions = [];
 
     if (InvenTreeStockItem().canCreate) {
+      actions.add(
+          SpeedDialChild(
+              child: FaIcon(FontAwesomeIcons.box),
+              label: L10().stockItemCreate,
+              onTap: () {
+                _newStockItem(context);
+              }
+          )
+      );
+    }
+
+    if (allowLabelPrinting && labels.isNotEmpty) {
       actions.add(
         SpeedDialChild(
-          child: FaIcon(FontAwesomeIcons.box),
-          label: L10().stockItemCreate,
-          onTap: () {
-            _newStockItem(context);
+          child: FaIcon(FontAwesomeIcons.print),
+          label: L10().printLabel,
+          onTap: () async {
+            selectAndPrintLabel(
+              context,
+              labels,
+              "part",
+              "part=${widget.part.pk}"
+            );
           }
         )
       );
@@ -226,6 +243,16 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
         });
       }
     });
+
+    allowLabelPrinting = await InvenTreeSettingsManager().getBool(INV_ENABLE_LABEL_PRINTING, true);
+    allowLabelPrinting &= api.getPlugins(mixin: "labels").isNotEmpty;
+
+    if (allowLabelPrinting) {
+      labels.clear();
+      labels = await getLabelTemplates("part", {
+        "part": widget.part.pk.toString(),
+      });
+    }
   }
 
   void _editPartDialog(BuildContext context) {

lib/widget/stock_detail.dart

@@ -9,6 +9,7 @@ import "package:inventree/helpers.dart";
 import "package:inventree/l10.dart";
 import "package:inventree/api.dart";
 import "package:inventree/api_form.dart";
+import "package:inventree/labels.dart";
 import "package:inventree/preferences.dart";
 
 import "package:inventree/inventree/company.dart";
@@ -127,13 +128,18 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
       );
     }
 
-    if (labels.isNotEmpty) {
+    if (allowLabelPrinting && labels.isNotEmpty) {
       actions.add(
         SpeedDialChild(
           child: FaIcon(FontAwesomeIcons.print),
           label: L10().printLabel,
-          onTap: () {
-            _printLabel(context);
+          onTap: () async {
+            selectAndPrintLabel(
+                context,
+                labels,
+                "stock",
+                "item=${widget.item.pk}"
+            );
           }
         )
       );
@@ -198,9 +204,10 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   int attachmentCount = 0;
 
+  bool allowLabelPrinting = true;
+
   @override
   Future<void> onBuild(BuildContext context) async {
-
     // Load part data if not already loaded
     if (part == null) {
       refresh(context);
@@ -209,9 +216,7 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   @override
   Future<void> request(BuildContext context) async {
-
     await api.StockStatus.load();
-
     stockShowHistory = await InvenTreeSettingsManager().getValue(INV_STOCK_SHOW_HISTORY, false) as bool;
     stockShowTests = await InvenTreeSettingsManager().getValue(INV_STOCK_SHOW_TESTS, true) as bool;
 
@@ -254,43 +259,20 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
       }
     });
 
+    // Determine if label printing is supported
+    allowLabelPrinting = await InvenTreeSettingsManager().getBool(INV_ENABLE_LABEL_PRINTING, true);
+    allowLabelPrinting &= api.getPlugins(mixin: "labels").isNotEmpty;
+
     // Request information on labels available for this stock item
-    if (InvenTreeAPI().pluginsEnabled()) {
-      _getLabels();
+    if (allowLabelPrinting) {
+      // Clear the existing labels list
+      labels.clear();
+      labels = await getLabelTemplates("stock", {
+        "item": widget.item.pk.toString()
+      });
     }
   }
 
-  Future <void> _getLabels() async {
-    // Clear the existing labels list
-    labels.clear();
-
-    // If the server does not support label printing, don't bother!
-    if (!InvenTreeAPI().supportsMixin("labels")) {
-      return;
-    }
-
-    InvenTreeAPI().get(
-        "/label/stock/",
-        params: {
-          "enabled": "true",
-          "item": "${widget.item.pk}",
-        },
-    ).then((APIResponse response) {
-      if (response.isValid() && response.statusCode == 200) {
-
-        for (var label in response.resultsList()) {
-          if (label is Map<String, dynamic>) {
-            labels.add(label);
-          }
-        }
-
-        if (mounted) {
-          setState(() {});
-        }
-      }
-    });
-  }
-
   /// Delete the stock item from the database
   Future<void> _deleteItem(BuildContext context) async {
 
@@ -314,87 +296,6 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   }
 
-  /// Opens a popup dialog allowing user to select a label for printing
-  Future <void> _printLabel(BuildContext context) async {
-
-    var plugins = InvenTreeAPI().getPlugins(mixin: "labels");
-
-    dynamic initial_label;
-    dynamic initial_plugin;
-
-    List<Map<String, dynamic>> label_options = [];
-    List<Map<String, dynamic>> plugin_options = [];
-
-    for (var label in labels) {
-      label_options.add({
-        "display_name": label["description"],
-        "value": label["pk"],
-      });
-    }
-
-    for (var plugin in plugins) {
-      plugin_options.add({
-        "display_name": plugin.humanName,
-        "value": plugin.key,
-      });
-    }
-
-    if (labels.length == 1) {
-      initial_label =  labels.first["pk"];
-    }
-
-    if (plugins.length == 1) {
-      initial_plugin = plugins.first.key;
-    }
-
-    Map<String, dynamic> fields = {
-      "label": {
-        "label": L10().labelTemplate,
-        "type": "choice",
-        "value": initial_label,
-        "choices": label_options,
-        "required": true,
-      },
-      "plugin": {
-        "label": L10().pluginPrinter,
-        "type": "choice",
-        "value": initial_plugin,
-        "choices": plugin_options,
-        "required": true,
-      }
-    };
-
-    launchApiForm(
-      context,
-      L10().printLabel,
-      "",
-      fields,
-      icon: FontAwesomeIcons.print,
-      onSuccess: (Map<String, dynamic> data) async {
-        int labelId = (data["label"] ?? -1) as int;
-        String pluginKey = (data["plugin"] ?? "") as String;
-
-        if (labelId != -1 && pluginKey.isNotEmpty) {
-          String url = "/label/stock/${labelId}/print/?item=${widget.item.pk}&plugin=${pluginKey}";
-
-          InvenTreeAPI().get(url).then((APIResponse response) {
-            if (response.isValid() && response.statusCode == 200) {
-              showSnackIcon(
-                L10().printLabelSuccess,
-                success: true
-              );
-            } else {
-              showSnackIcon(
-                L10().printLabelFailure,
-                success: false,
-              );
-            }
-          });
-        }
-      },
-    );
-  }
-
   Future <void> _editStockItem(BuildContext context) async {
 
     var fields = InvenTreeStockItem().formFields();