Adds a new "Panel" mixin which can render custom panels on given pages

- Adds item to sidebar menu
- Adds panel content
- Runs custom javascript when the page is loaded

InvenTree/plugin/builtin/integration/mixins.py

@@ -9,6 +9,8 @@ import requests
 from django.urls import include, re_path
 from django.db.utils import OperationalError, ProgrammingError
 
+import InvenTree.helpers
+
 from plugin.models import PluginConfig, PluginSetting
 from plugin.urls import PLUGIN_BASE
 from plugin.helpers import MixinImplementationError, MixinNotImplementedError
@@ -563,19 +565,32 @@ class PanelMixin:
 
     This method is provided with:
 
-    - page: The name of the page e.g. 'part-detail'
+    - view : The View object which is being rendered
-    - instance: The model instance specific to the page
+    - request : The HTTPRequest object
-    - request: The request object responsible for the page load
-
-    It must return a list of CustomPanel class instances (see below).
 
     Note that as this is called dynamically (per request),
     then the actual panels returned can vary depending on the particular request or page
 
-    """
+    The 'get_custom_panels' method must return a list of dict objects, each with the following keys:
 
-    class CustomPanel:
+    - title : The title of the panel, to appear in the sidebar menu
-        ...
+    - description : Extra descriptive text (optional)
+    - icon : The icon to appear in the sidebar menu
+    - content : The HTML content to appear in the panel, OR
+    - content_template : A template file which will be rendered to produce the panel content
+    - javascript : The javascript content to be rendered when the panel is loade, OR
+    - javascript_template : A template file which will be rendered to produce javascript
+
+    e.g.
+
+    {
+        'title': "Updates",
+        'description': "Latest updates for this part",
+        'javascript': 'alert("You just loaded this panel!")',
+        'content': '<b>Hello world</b>',
+    }
+
+    """
 
     class MixinMeta:
         MIXIN_NAME = 'Panel'
@@ -584,5 +599,38 @@ class PanelMixin:
         super().__init__()
         self.add_mixin('panel', True, __class__)
 
-    def get_custom_panels(self, page, instance, request):
+    def render_panels(self, view, request):
+
+        panels = []
+
+        for panel in self.get_custom_panels(view, request):
+
+            if 'content_template' in panel:
+                # TODO: Render the actual content
+                ...
+
+            if 'javascript_template' in panel:
+                # TODO: Render the actual content
+                ...
+            
+            # Check for required keys
+            required_keys = ['title', 'content']
+
+            if any([key not in panel for key in required_keys]):
+                logger.warning(f"Custom panel for plugin '{__class__}' is missing a required key")
+                continue
+
+            # Add some information on this plugin
+            panel['plugin'] = self
+            panel['slug'] = self.slug
+            
+            # Add a 'key' for the panel, which is mostly guaranteed to be unique
+            panel['key'] = InvenTree.helpers.generateTestKey(self.slug + panel.get('title', 'panel')) 
+
+            panels.append(panel)
+
+        return panels
+
+    def get_custom_panels(self, view, request):
+        """ This method *must* be implemented by the plugin class """
         raise NotImplementedError(f"{__class__} is missing the 'get_custom_panels' method")

InvenTree/plugin/registry.py

@@ -307,14 +307,17 @@ class PluginsRegistry:
                 # TODO check more stuff -> as of Nov 2021 there are not many checks in place
                 # but we could enhance those to check signatures, run the plugin against a whitelist etc.
                 logger.info(f'Loading integration plugin {plugin.PLUGIN_NAME}')
+
                 try:
                     plugin = plugin()
                 except Exception as error:
                     # log error and raise it -> disable plugin
                     handle_error(error, log_name='init')
 
-                logger.info(f'Loaded integration plugin {plugin.slug}')
+                logger.debug(f'Loaded integration plugin {plugin.PLUGIN_NAME}')
+
                 plugin.is_package = was_packaged
+
                 if plugin_db_setting:
                     plugin.pk = plugin_db_setting.pk
 

InvenTree/plugin/samples/integration/custom_panel_sample.py

@@ -5,6 +5,9 @@ Sample plugin which renders custom panels on certain pages
 from plugin import IntegrationPluginBase
 from plugin.mixins import PanelMixin
 
+from part.views import PartDetail
+from stock.views import StockLocationDetail
+
 
 class CustomPanelSample(PanelMixin, IntegrationPluginBase):
     """
@@ -15,8 +18,51 @@ class CustomPanelSample(PanelMixin, IntegrationPluginBase):
     PLUGIN_SLUG = "panel"
     PLUGIN_TITLE = "Custom Panel Example"
 
-    def get_custom_panels(self, page, instance, request):
+    def get_custom_panels(self, view, request):
 
-        print("get_custom_panels:")
+        panels = [
+            {
+                # This 'hello world' panel will be displayed on any view which implements custom panels
+                'title': 'Hello World',
+                'icon': 'fas fa-boxes',
+                'content': '<b>Hello world!</b>',
+                'description': 'A simple panel which renders hello world',
+                'javascript': 'alert("Hello world");',
+            },
+            {
+                # This panel will not be displayed, as it is missing the 'content' key
+                'title': 'No Content',
+            }
+        ]
 
-        return []
+        # This panel will *only* display on the PartDetail view
+        if isinstance(view, PartDetail):
+            panels.append({
+                'title': 'Custom Part Panel',
+                'icon': 'fas fa-shapes',
+                'content': '<em>This content only appears on the PartDetail page, you know!</em>',
+            })
+
+        # 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()
+
+                if not loc.get_descendants(include_self=False).exists():
+                    panels.append({
+                        'title': 'Childless',
+                        'icon': 'fa-user',
+                        'content': '<h4>I have no children!</h4>'
+                    })
+                else:
+                    print("abcdefgh")
+
+            except:
+                print("error could not get object!")
+                pass
+
+        return panels