From fc220efb6ca299f0e552691152a60521f2a6e732 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Mon, 6 Jan 2020 14:30:44 +1100
Subject: [PATCH] Create UI to switch between views easily

---
 src/ifcblenderexport/blenderbim/__init__.py |  1 +
 src/ifcblenderexport/blenderbim/operator.py | 19 +++++++++++++++++++
 src/ifcblenderexport/blenderbim/prop.py     | 15 +++++++++++++++
 src/ifcblenderexport/blenderbim/ui.py       |  4 ++++
 4 files changed, 39 insertions(+)

diff --git a/src/ifcblenderexport/blenderbim/__init__.py b/src/ifcblenderexport/blenderbim/__init__.py
index e9158c6204..c440e16728 100644
--- a/src/ifcblenderexport/blenderbim/__init__.py
+++ b/src/ifcblenderexport/blenderbim/__init__.py
@@ -81,6 +81,7 @@ if bpy is not None:
         operator.CreateSheets,
         operator.GenerateDigitalTwin,
         operator.CreateView,
+        operator.ActivateView,
         prop.Subcontext,
         prop.BIMProperties,
         prop.DocProperties,
diff --git a/src/ifcblenderexport/blenderbim/operator.py b/src/ifcblenderexport/blenderbim/operator.py
index 3ed66485dd..d23d149043 100644
--- a/src/ifcblenderexport/blenderbim/operator.py
+++ b/src/ifcblenderexport/blenderbim/operator.py
@@ -881,3 +881,22 @@ class GenerateDigitalTwin(bpy.types.Operator):
     def execute(self, context):
         # Does absolutely nothing at all :D
         return {'FINISHED'}
+
+class ActivateView(bpy.types.Operator):
+    bl_idname = 'bim.activate_view'
+    bl_label = 'Activate View'
+
+    def execute(self, context):
+        camera = bpy.data.objects.get(bpy.context.scene.DocProperties.available_views)
+        if not camera:
+            return {'FINISHED'}
+        bpy.context.scene.camera = camera
+        area = next(area for area in bpy.context.screen.areas if area.type == 'VIEW_3D')
+        area.spaces[0].region_3d.view_perspective = 'CAMERA'
+        views_collection = bpy.data.collections.get('Views')
+        for collection in views_collection.children:
+            bpy.context.view_layer.layer_collection.children['Views'].children[collection.name].hide_viewport = True
+            bpy.data.collections.get(collection.name).hide_render = True
+        bpy.context.view_layer.layer_collection.children['Views'].children[camera.users_collection[0].name].hide_viewport = False
+        bpy.data.collections.get(camera.users_collection[0].name).hide_render = False
+        return {'FINISHED'}
diff --git a/src/ifcblenderexport/blenderbim/prop.py b/src/ifcblenderexport/blenderbim/prop.py
index 230d46a8e9..9ef6b22c69 100644
--- a/src/ifcblenderexport/blenderbim/prop.py
+++ b/src/ifcblenderexport/blenderbim/prop.py
@@ -38,6 +38,7 @@ subcontexts_enum = []
 target_views_enum = []
 persons_enum = []
 organisations_enum = []
+views_enum = []
 
 @persistent
 def setDefaultProperties(scene):
@@ -209,6 +210,19 @@ def getTargetViews(self, context):
     return target_views_enum
 
 
+def getViews(self, context):
+    global views_enum
+    views_enum.clear()
+    views_collection = bpy.data.collections.get('Views')
+    if not views_collection:
+        return views_enum
+    for collection in views_collection.children:
+        for obj in collection.objects:
+            if obj.type == 'CAMERA':
+                views_enum.append((obj.name, obj.name, ''))
+    return views_enum
+
+
 class Subcontext(PropertyGroup):
     name: StringProperty(name='Name')
     target_view: StringProperty(name='Target View')
@@ -217,6 +231,7 @@ class Subcontext(PropertyGroup):
 class DocProperties(PropertyGroup):
     should_recut: BoolProperty(name="Should Recut", default=True)
     view_name: StringProperty(name="View Name")
+    available_views: EnumProperty(items=getViews, name="Available Views")
 
 
 class BIMCameraProperties(PropertyGroup):
diff --git a/src/ifcblenderexport/blenderbim/ui.py b/src/ifcblenderexport/blenderbim/ui.py
index 64f456d71f..5c10b94331 100644
--- a/src/ifcblenderexport/blenderbim/ui.py
+++ b/src/ifcblenderexport/blenderbim/ui.py
@@ -198,6 +198,10 @@ class BIM_PT_documentation(Panel):
         row.prop(props, 'view_name')
         row.operator('bim.create_view', icon='ADD', text='')
 
+        row = layout.row()
+        row.prop(props, 'available_views')
+        row.operator('bim.activate_view', icon='SCENE', text='')
+
         row = layout.row()
         row.operator('bim.create_sheets')