Adds a new InvenTreePluginMixin mixin class for enabling custom plugin rendering on a page

- Any view which needs custom plugin code must implement this mixin
- Initially implement for the PartDetail page

InvenTree/InvenTree/views.py

@@ -38,6 +38,8 @@ from part.models import PartCategory
 from common.models import InvenTreeSetting, ColorTheme
 from users.models import check_user_role, RuleSet
 
+from plugin.registry import registry
+
 from .forms import DeleteForm, EditUserForm, SetPasswordForm
 from .forms import SettingCategorySelectForm
 from .helpers import str2bool
@@ -56,6 +58,38 @@ def auth_request(request):
         return HttpResponse(status=403)
 
 
+class InvenTreePluginMixin:
+    """
+    Custom view mixin which adds context data to the view,
+    based on loaded plugins.
+
+    This allows rendered pages to be augmented by loaded plugins.
+
+    """
+
+    def get_plugin_panels(self):
+        """
+        Return a list of extra 'plugin panels' associated with this view
+        """
+
+        panels = []
+
+        for plug in registry.with_mixin('panel'):
+
+            panels += plug.render_panels(self, self.request)
+
+        return panels
+
+    def get_context_data(self, **kwargs):
+
+        ctx = super().get_context_data(**kwargs)
+
+        if settings.PLUGINS_ENABLED:
+            ctx['plugin_panels'] = self.get_plugin_panels()
+
+        return ctx
+
+
 class InvenTreeRoleMixin(PermissionRequiredMixin):
     """
     Permission class based on user roles, not user 'permissions'.

InvenTree/part/templates/part/detail.html

@@ -397,9 +397,11 @@
             </div>
             <table class='table table-condensed table-striped' id='manufacturer-part-table' data-toolbar='#manufacturer-button-toolbar'></table>
         </div>
-    </div>
+    </div>    
 </div>
 
+{% include "panel/plugin_panels.html" %}
+
 {% endblock %}
 
 {% block js_load %}
@@ -1083,4 +1085,6 @@
         }
     });
 
+    {% include "panel/plugin_javascript.html" %}
+
 {% endblock %}

InvenTree/part/templates/part/part_sidebar.html

@@ -58,3 +58,5 @@
 {% include "sidebar_item.html" with label="part-attachments" text=text icon="fa-paperclip" %}
 {% trans "Notes" as text %}
 {% include "sidebar_item.html" with label="part-notes" text=text icon="fa-clipboard" %}
+
+{% include "panel/plugin_menu_items.html" %}

InvenTree/part/views.py

@@ -49,7 +49,7 @@ from order.models import PurchaseOrderLineItem
 
 from InvenTree.views import AjaxView, AjaxCreateView, AjaxUpdateView, AjaxDeleteView
 from InvenTree.views import QRCodeView
-from InvenTree.views import InvenTreeRoleMixin
+from InvenTree.views import InvenTreeRoleMixin, InvenTreePluginMixin
 
 from InvenTree.helpers import str2bool
 
@@ -365,7 +365,7 @@ class PartImportAjax(FileManagementAjaxView, PartImport):
         return PartImport.validate(self, self.steps.current, form, **kwargs)
 
 
-class PartDetail(InvenTreeRoleMixin, DetailView):
+class PartDetail(InvenTreeRoleMixin, InvenTreePluginMixin, DetailView):
     """ Detail view for Part object
     """
 

InvenTree/plugin/samples/integration/custom_panel_sample.py

@@ -46,9 +46,6 @@ class CustomPanelSample(PanelMixin, IntegrationPluginBase):
         # This panel will *only* display on the StockLocation view,
         # and *only* if the StockLocation has *no* child locations
         if isinstance(view, StockLocationDetail):
-            
-            print("yep, stocklocation view!")
-
             try:
                 loc = view.get_object()
 
@@ -58,11 +55,7 @@ class CustomPanelSample(PanelMixin, IntegrationPluginBase):
                         'icon': 'fa-user',
                         'content': '<h4>I have no children!</h4>'
                     })
-                else:
-                    print("abcdefgh")
-
             except:
-                print("error could not get object!")
                 pass
 
         return panels

InvenTree/templates/panel/plugin_javascript.html

@@ -0,0 +1,10 @@
+{% if plugin_panels %}
+// Run custom javascript when plugin panels are loaded
+{% for panel in plugin_panels %}
+{% if panel.javascript %}
+onPanelLoad('{{ panel.key }}', function() {
+{{ panel.javascript | safe }}
+});
+{% endif %}
+{% endfor %}
+{% endif %}

InvenTree/templates/panel/plugin_menu_items.html

@@ -0,0 +1,3 @@
+{% for panel in plugin_panels %}
+{% include "sidebar_item.html" with label=panel.key text=panel.title icon=panel.icon %}
+{% endfor %}

InvenTree/templates/panel/plugin_panels.html

@@ -0,0 +1,18 @@
+{% for panel in plugin_panels %}
+
+<div class='panel panel-hidden' id='panel-{{ panel.key }}'>
+    <div class='panel-heading'>
+        <div class='d-flex flex-wrap'>
+            <h4>{{ panel.title }}</h4>
+            {% include "spacer.html" %}
+            <div class='btn-group' role='group'>
+                <!-- TODO: Implement custom action buttons for plugin panels -->
+            </div>
+        </div>
+    </div>
+    <div class='panel-content'>
+        {{ panel.content | safe }}
+    </div>
+</div>
+
+{% endfor %}