Load thumbnails in a paginated manner to allow to scale to larger models

src/blenderbim/blenderbim/bim/module/model/product.py

@@ -201,7 +201,9 @@ class ChangeTypePage(bpy.types.Operator, tool.Ifc.Operator):
     page: bpy.props.IntProperty()
 
     def _execute(self, context):
-        context.scene.BIMModelProperties.type_page = self.page
+        props = context.scene.BIMModelProperties
+        bpy.ops.bim.load_type_thumbnails(ifc_class=props.type_class, offset=9 * (self.page - 1), limit=9)
+        props.type_page = self.page
         return {"FINISHED"}
 
 
@@ -316,14 +318,24 @@ class LoadTypeThumbnails(bpy.types.Operator, tool.Ifc.Operator):
     bl_label = "Load Type Thumbnails"
     bl_options = {"REGISTER", "UNDO"}
     ifc_class: bpy.props.StringProperty()
+    limit: bpy.props.IntProperty()
+    offset: bpy.props.IntProperty()
 
     def _execute(self, context):
         from PIL import Image, ImageDraw
 
+        props = bpy.context.scene.BIMModelProperties
         processing = set()
-        # Only process at most one class at a time.
+        # Only process at most one paginated class at a time.
         # Large projects have hundreds of types which can lead to unnecessary lag.
-        queue = tool.Ifc.get().by_type(self.ifc_class)
+        queue = sorted(tool.Ifc.get().by_type(self.ifc_class), key=lambda e: e.Name or "Unnamed")
+        if self.limit:
+            queue = queue[self.offset:self.offset + self.limit]
+        else:
+            offset = 9 * (props.type_page - 1)
+            if offset < 0:
+                offset = 0
+            queue = queue[offset:offset + 9]
 
         unit_scale = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
 

src/blenderbim/blenderbim/bim/module/model/ui.py

@@ -38,7 +38,7 @@ class LaunchTypeManager(bpy.types.Operator):
         props.type_page = 1
         if props.ifc_class:
             props.type_class = props.ifc_class
-            bpy.ops.bim.load_type_thumbnails(ifc_class=props.ifc_class)
+            bpy.ops.bim.load_type_thumbnails(ifc_class=props.ifc_class, offset=0, limit=9)
         if not AuthoringData.is_loaded:
             AuthoringData.load()
         return context.window_manager.invoke_popup(self, width=550)

src/blenderbim/blenderbim/tool/project.py

@@ -42,7 +42,7 @@ class Project(blenderbim.core.tool.Project):
     def load_default_thumbnails(cls):
         if tool.Ifc.get().by_type("IfcElementType"):
             ifc_class = sorted(tool.Ifc.get().by_type("IfcElementType"), key=lambda e: e.is_a())[0].is_a()
-            bpy.ops.bim.load_type_thumbnails(ifc_class=ifc_class)
+            bpy.ops.bim.load_type_thumbnails(ifc_class=ifc_class, offset=0, limit=9)
 
     @classmethod
     def run_aggregate_assign_object(cls, relating_obj=None, related_obj=None):