WIP refactor context UI into its own module. Remove dependency to Blender properties. See #1222.

src/ifcblenderexport/blenderbim/bim/module/context/__init__.py

@@ -0,0 +1,16 @@
+import bpy
+from . import ui, operator
+
+classes = (
+    operator.AddSubcontext,
+    operator.RemoveSubcontext,
+    ui.BIM_PT_context,
+)
+
+
+def register():
+    pass
+
+
+def unregister():
+    pass

src/ifcblenderexport/blenderbim/bim/module/context/data.py

@@ -0,0 +1,30 @@
+import blenderbim.bim.ifc
+
+is_loaded = False
+
+class Data:
+    is_loaded = False
+    contexts = {}
+
+    @classmethod
+    def load(cls):
+        file = blenderbim.bim.ifc.IfcStore.get_file()
+        if not file:
+            return
+        cls.contexts = {}
+        for context in file.by_type("IfcGeometricRepresentationContext", include_subtypes=False):
+            subcontexts = {}
+            # See bug #1224 for why we don't use HasSubContexts
+            for subcontext in file.by_type("IfcGeometricRepresentationSubContext"):
+                if subcontext.ParentContext != context:
+                    continue
+                subcontexts[int(subcontext.id())] = {
+                    "ContextType": subcontext.ContextType,
+                    "ContextIdentifier": subcontext.ContextIdentifier,
+                    "TargetView": subcontext.TargetView,
+                }
+            cls.contexts[int(context.id())] = {
+                "ContextType": context.ContextType,
+                "HasSubContexts": subcontexts
+            }
+        cls.is_loaded = True

src/ifcblenderexport/blenderbim/bim/module/context/operator.py

@@ -0,0 +1,37 @@
+import bpy
+import blenderbim.bim.ifc
+import blenderbim.bim.module.context.add_context as add_context
+import blenderbim.bim.module.context.remove_context as remove_context
+from blenderbim.bim.module.context.data import Data
+
+class AddSubcontext(bpy.types.Operator):
+    bl_idname = "bim.add_subcontext"
+    bl_label = "Add Subcontext"
+
+    def execute(self, context):
+        self.file = blenderbim.bim.ifc.IfcStore.get_file()
+        usecase = add_context.Usecase(self.file, {
+            "context": bpy.context.scene.BIMProperties.available_contexts,
+            "subcontext": bpy.context.scene.BIMProperties.available_subcontexts,
+            "target_view": bpy.context.scene.BIMProperties.available_target_views,
+        })
+        result = usecase.execute()
+
+        Data.load()
+        return {"FINISHED"}
+
+
+class RemoveSubcontext(bpy.types.Operator):
+    bl_idname = "bim.remove_subcontext"
+    bl_label = "Remove Context"
+    ifc_definition_id: bpy.props.IntProperty()
+
+    def execute(self, context):
+        self.file = blenderbim.bim.ifc.IfcStore.get_file()
+        usecase = remove_context.Usecase(self.file, {
+            "context": self.file.by_id(self.ifc_definition_id)
+        })
+        usecase.execute()
+
+        Data.load()
+        return {"FINISHED"}

src/ifcblenderexport/blenderbim/bim/module/context/ui.py

@@ -0,0 +1,35 @@
+from bpy.types import Panel
+from blenderbim.bim.module.context.data import Data
+
+class BIM_PT_context(Panel):
+    bl_label = "IFC Geometric Representation Contexts"
+    bl_idname = "BIM_PT_context"
+    bl_options = {"DEFAULT_CLOSED"}
+    bl_space_type = "PROPERTIES"
+    bl_region_type = "WINDOW"
+    bl_context = "scene"
+
+    def draw(self, context):
+        if not Data.is_loaded:
+            Data.load()
+
+        layout = self.layout
+        props = context.scene.BIMProperties
+
+        row = layout.row(align=True)
+        row.prop(props, "available_contexts", text="")
+        row.prop(props, "available_subcontexts", text="")
+        row.prop(props, "available_target_views", text="")
+        row.operator("bim.add_subcontext", icon="ADD", text="")
+
+        for ifc_definition_id, context in Data.contexts.items():
+            box = self.layout.box()
+            row = box.row(align=True)
+            row.label(text=context["ContextType"])
+            row.operator("bim.remove_subcontext", icon="X", text="").ifc_definition_id = ifc_definition_id
+            for ifc_definition_id2, subcontext in context["HasSubContexts"].items():
+                row = box.row(align=True)
+                row.label(text=subcontext["ContextType"])
+                row.label(text=subcontext["ContextIdentifier"])
+                row.label(text=subcontext["TargetView"])
+                row.operator("bim.remove_subcontext", icon="X", text="").ifc_definition_id = ifc_definition_id2