QR code improvements

- Display QR codes as links to served images
- The qr_code plugin caches these images in the background
- Make a qr_code template to push out as a modal form
- Create a QRCodeView to simplify display of QR codes
- Add option to launchModalForm() to disable the 'submit' button

Refactored QR code display for

- StockLocation
- StockItem
- Part

InvenTree/stock/models.py

@@ -36,7 +36,6 @@ class StockLocation(InvenTreeTree):
     def has_items(self):
         return self.stock_items.count() > 0
 
-    @property
     def format_barcode(self):
         """ Return a JSON string for formatting a barcode for this StockLocation object """
 
@@ -139,7 +138,6 @@ class StockItem(models.Model):
             ('part', 'serial'),
         ]
 
-    @property
     def format_barcode(self):
         """ Return a JSON string for formatting a barcode for this StockItem.
         Can be used to perform lookup of a stockitem using barcode

InvenTree/stock/templates/stock/item.html

@@ -2,8 +2,6 @@
 {% load static %}
 {% block content %}
 
-{% load qr_code %}
-
 <div class='row'>
 <div class='col-sm-6'>
     <h3>Stock Item Details</h3>
@@ -25,6 +23,8 @@
           <li><a href='#' id='stock-stocktake' title='Count stock'>Stocktake</a></li>
           {% endif %}
           <li><a href="#" id='stock-delete' title='Delete stock item'>Delete stock item</a></li>
+          <hr>
+          <li><a href="#" id='item-qr-code' title='Generate QR code'>Show QR code</a></li>
         </ul>
     </div>
     </div>
@@ -109,9 +109,6 @@
         {% endif %}
         </table>
     </div>
-    <div class='col-sm-6'>
-        {% qr_from_text item.format_barcode size="s" image_format="png" error_correction="L" %}
-    </div>
 </div>
 
 
@@ -148,6 +145,13 @@
                         });
     });
 
+    $("#item-qr-code").click(function() {
+        launchModalForm("{% url 'stock-item-qr' item.id %}",
+        {
+            no_post: true,
+        });
+    });
+
     {% if item.in_stock %}
     $("#stock-move").click(function() {
         launchModalForm(

InvenTree/stock/templates/stock/location.html

@@ -1,6 +1,5 @@
 {% extends "stock/stock_app_base.html" %}
 {% load static %}
-{% load qr_code %}
 {% block content %}
 
 <div class='row'>
@@ -24,12 +23,13 @@
         <ul class="dropdown-menu">
           <li><a href="#" id='location-edit' title='Edit stock location'>Edit</a></li>
           <li><a href="#" id='location-delete' title='Delete stock location'>Delete</a></li>
+          <hr>
+          <li><a href="#" id='location-qr-code' title='Generate QR code'>Show QR code</a></li>
         </ul>
     </div>
-    {% qr_from_text location.format_barcode size="s" image_format="png" error_correction="L" %}
     {% endif %}
-    </div>
-    </h3>
+</div>
+</h3>
 </div>
 </div>
 
@@ -101,6 +101,13 @@
         return false;
     });
 
+    $('#location-qr-code').click(function() {
+        launchModalForm("{% url 'stock-location-qr' location.id %}",
+        {
+            no_post: true,
+        });
+    });
+
     {% endif %}
 
     $('#item-create').click(function () {
@@ -170,5 +177,4 @@
         },
         url: "{% url 'api-stock-list' %}",
     });
-
 {% endblock %}

InvenTree/stock/urls.py

@@ -10,6 +10,7 @@ from . import views
 stock_location_detail_urls = [
     url(r'^edit/?', views.StockLocationEdit.as_view(), name='stock-location-edit'),
     url(r'^delete/?', views.StockLocationDelete.as_view(), name='stock-location-delete'),
+    url(r'^qr_code/?', views.StockLocationQRCode.as_view(), name='stock-location-qr'),
 
     # Anything else
     url('^.*$', views.StockLocationDetail.as_view(), name='stock-location-detail'),
@@ -20,6 +21,7 @@ stock_item_detail_urls = [
     url(r'^delete/?', views.StockItemDelete.as_view(), name='stock-item-delete'),
     url(r'^move/?', views.StockItemMove.as_view(), name='stock-item-move'),
     url(r'^stocktake/?', views.StockItemStocktake.as_view(), name='stock-item-stocktake'),
+    url(r'^qr_code/?', views.StockItemQRCode.as_view(), name='stock-item-qr'),
 
     url('^.*$', views.StockItemDetail.as_view(), name='stock-item-detail'),
 ]

InvenTree/stock/views.py

@@ -10,6 +10,7 @@ from django.forms.models import model_to_dict
 from django.forms import HiddenInput
 
 from InvenTree.views import AjaxUpdateView, AjaxDeleteView, AjaxCreateView
+from InvenTree.views import QRCodeView
 
 from part.models import Part
 from .models import StockItem, StockLocation, StockItemTracking
@@ -75,6 +76,34 @@ class StockLocationEdit(AjaxUpdateView):
     ajax_form_title = 'Edit Stock Location'
 
 
+class StockLocationQRCode(QRCodeView):
+    """ View for displaying a QR code for a StockLocation object """
+
+    ajax_form_title = "Stock Location QR code"
+
+    def get_qr_data(self):
+        """ Generate QR code data for the StockLocation """
+        try:
+            loc = StockLocation.objects.get(id=self.pk)
+            return loc.format_barcode()
+        except StockLocation.DoesNotExist:
+            return None
+
+
+class StockItemQRCode(QRCodeView):
+    """ View for displaying a QR code for a StockItem object """
+
+    ajax_form_title = "Stock Item QR Code"
+
+    def get_qr_data(self):
+        """ Generate QR code data for the StockItem """
+        try:
+            item = StockItem.objects.get(id=self.pk)
+            return item.format_barcode()
+        except StockItem.DoesNotExist:
+            return None
+            
+
 class StockItemEdit(AjaxUpdateView):
     """
     View for editing details of a single StockItem