New UI to manage IFC constraints in the file

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -58,6 +58,8 @@ if bpy is not None:
         operator.RemoveQto,
         operator.AddMaterialPset,
         operator.RemoveMaterialPset,
+        operator.AddConstraint,
+        operator.RemoveConstraint,
         operator.AddDocumentInformation,
         operator.RemoveDocumentInformation,
         operator.AssignDocumentInformation,
@@ -154,6 +156,7 @@ if bpy is not None:
         prop.DocumentReference,
         prop.ClashSource,
         prop.ClashSet,
+        prop.Constraint,
         prop.BcfTopic,
         prop.BcfTopicLabel,
         prop.BcfTopicFile,
@@ -184,6 +187,7 @@ if bpy is not None:
         ui.BIM_PT_psets,
         ui.BIM_PT_classifications,
         ui.BIM_PT_document_information,
+        ui.BIM_PT_constraints,
         ui.BIM_PT_search,
         ui.BIM_PT_ifccsv,
         ui.BIM_PT_ifcclash,
@@ -204,6 +208,7 @@ if bpy is not None:
         ui.BIM_PT_camera,
         ui.BIM_PT_text,
         ui.BIM_UL_clash_sets,
+        ui.BIM_UL_constraints,
         ui.BIM_UL_document_information,
         ui.BIM_UL_document_references,
         ui.BIM_UL_topics,

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -820,6 +820,26 @@ class RemoveMaterialPset(bpy.types.Operator):
         return {'FINISHED'}
 
 
+class AddConstraint(bpy.types.Operator):
+    bl_idname = 'bim.add_constraint'
+    bl_label = 'Add Constraint'
+
+    def execute(self, context):
+        constraint = bpy.context.scene.BIMProperties.constraints.add()
+        constraint.name = 'New Constraint'
+        return {'FINISHED'}
+
+
+class RemoveConstraint(bpy.types.Operator):
+    bl_idname = 'bim.remove_constraint'
+    bl_label = 'Remove Constraint'
+    index: bpy.props.IntProperty()
+
+    def execute(self, context):
+        bpy.context.scene.BIMProperties.constraints.remove(self.index)
+        return {'FINISHED'}
+
+
 class AddDocumentInformation(bpy.types.Operator):
     bl_idname = 'bim.add_document_information'
     bl_label = 'Add Document Information'

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -483,6 +483,36 @@ class ClashSet(PropertyGroup):
     b: CollectionProperty(name='Group B', type=ClashSource)
 
 
+class Constraint(PropertyGroup):
+    name: StringProperty(name='Name')
+    description: StringProperty(name='Description')
+    constraint_grade: EnumProperty(items=[
+        ('HARD', 'HARD', 'Qualifies a constraint such that it must be followed rigidly within or at the values set.'),
+        ('SOFT', 'SOFT', 'Qualifies a constraint such that it should be followed within or at the values set.'),
+        ('ADVISORY', 'ADVISORY', 'Qualifies a constraint such that it is advised that it is followed within or at the values set.'),
+        ('USERDEFINED', 'USERDEFINED', 'A user-defined grade indicated by a separate attribute at the referencing entity.'),
+        ('NOTDEFINED', 'NOTDEFINED', 'Grade has not been specified.'),
+        ], name='Grade')
+    constraint_source: StringProperty(name='Source')
+    user_defined_grade: StringProperty(name='Custom Grade')
+    objective_qualifier: EnumProperty(items=[
+        ('CODECOMPLIANCE', 'CODECOMPLIANCE', 'A constraint whose objective is to ensure satisfaction of a code compliance provision.'),
+        ('CODEWAIVER', 'CODEWAIVER', 'A constraint whose objective is to identify an agreement that code compliance requirements (the waiver) will not be enforced.'),
+        ('DESIGNINTENT', 'DESIGNINTENT', 'A constraint whose objective is to ensure satisfaction of a design intent provision.'),
+        ('EXTERNAL', 'EXTERNAL', 'A constraint whose objective is to synchronize data with an external source such as a file'),
+        ('HEALTHANDSAFETY', 'HEALTHANDSAFETY', 'A constraint whose objective is to ensure satisfaction of a health and safety provision.'),
+        ('MERGECONFLICT', 'MERGECONFLICT', 'A constraint whose objective is to resolve a conflict such as merging data from multiple sources.'),
+        ('MODELVIEW', 'MODELVIEW', 'A constraint whose objective is to ensure data conforms to a model view definition.'),
+        ('PARAMETER', 'PARAMETER', 'A constraint whose objective is to calculate a value based on other referenced values.'),
+        ('REQUIREMENT', 'REQUIREMENT', 'A constraint whose objective is to ensure satisfaction of a project requirement provision.'),
+        ('SPECIFICATION', 'SPECIFICATION', 'A constraint whose objective is to ensure satisfaction of a specification provision.'),
+        ('TRIGGERCONDITION', 'TRIGGERCONDITION', 'A constraint whose objective is to indicate a limiting value beyond which the condition of an object requires a particular form of attention.'),
+        ('USERDEFINED', 'USERDEFINED', ''),
+        ('NOTDEFINED', 'NOTDEFINED', '')
+        ], name='Qualifier')
+    user_defined_qualifier: StringProperty(name='Custom Qualifier')
+
+
 class BcfTopic(PropertyGroup):
     name: StringProperty(name='Name')
 
@@ -956,6 +986,8 @@ class BIMProperties(PropertyGroup):
     active_document_reference_index: IntProperty(name='Active Document Reference Index')
     clash_sets: CollectionProperty(name='Clash Sets', type=ClashSet)
     active_clash_set_index: IntProperty(name='Active Clash Set Index')
+    constraints: CollectionProperty(name='Constraints', type=Constraint)
+    active_constraint_index: IntProperty(name='Active Constraint Index')
 
 
 class BCFProperties(PropertyGroup):

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -203,6 +203,46 @@ class BIM_PT_document_information(Panel):
             row.operator('bim.unassign_document_reference', text='Unassign Reference')
 
 
+class BIM_PT_constraints(Panel):
+    bl_label = 'IFC Constraints'
+    bl_idname = 'BIM_PT_constraints'
+    bl_options = {'DEFAULT_CLOSED'}
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = 'scene'
+
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        props = context.scene.BIMProperties
+
+        row = layout.row()
+        row.operator('bim.add_constraint')
+
+        if props.constraints:
+            layout.template_list('BIM_UL_constraints', '', props, 'constraints', props, 'active_constraint_index')
+
+            if props.active_constraint_index < len(props.constraints):
+                constraint = props.constraints[props.active_constraint_index]
+                row = layout.row(align=True)
+                row.prop(constraint, 'name')
+                row.operator('bim.remove_constraint', icon='X', text='').index = props.active_constraint_index
+                row = layout.row()
+                row.prop(constraint, 'description')
+                row = layout.row()
+                row.prop(constraint, 'constraint_grade')
+                if constraint.constraint_grade == 'USERDEFINED':
+                    row = layout.row()
+                    row.prop(constraint, 'user_defined_grade')
+                row = layout.row()
+                row.prop(constraint, 'constraint_source')
+                row = layout.row()
+                row.prop(constraint, 'objective_qualifier')
+                if constraint.objective_qualifier == 'USERDEFINED':
+                    row = layout.row()
+                    row.prop(constraint, 'user_defined_qualifier')
+
+
 class BIM_PT_documents(Panel):
     bl_label = 'IFC Documents'
     bl_idname = 'BIM_PT_documents'
@@ -1283,6 +1323,15 @@ class BIM_UL_clash_sets(bpy.types.UIList):
             layout.label(text="", translate=False)
 
 
+class BIM_UL_constraints(bpy.types.UIList):
+    def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
+        ob = data
+        if item:
+            layout.prop(item, 'name', text='', emboss=False)
+        else:
+            layout.label(text="", translate=False)
+
+
 class BIM_UL_document_information(bpy.types.UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
         ob = data