Merge pull request #99 from BigRoy/master

Implement on instanceToggled callback in Fusion

colorbleed/fusion/__init__.py

@@ -18,9 +18,39 @@ def install():
     avalon.register_plugin_path(avalon.Loader, LOAD_PATH)
     avalon.register_plugin_path(avalon.Creator, CREATE_PATH)
 
+    pyblish.register_callback("instanceToggled", on_pyblish_instance_toggled)
+
 
 def uninstall():
     print("Deregistering Fusion plug-ins..")
     pyblish.deregister_plugin_path(PUBLISH_PATH)
     avalon.deregister_plugin_path(avalon.Loader, LOAD_PATH)
     avalon.deregister_plugin_path(avalon.Creator, CREATE_PATH)
+
+    pyblish.deregister_callback("instanceToggled", on_pyblish_instance_toggled)
+
+
+def on_pyblish_instance_toggled(instance, new_value, old_value):
+    """Toggle saver tool passthrough states on instance toggles."""
+
+    from avalon.fusion import comp_lock_and_undo_chunk
+
+    comp = instance.context.data.get("currentComp")
+    if not comp:
+        return
+
+    savers = [tool for tool in instance if
+              getattr(tool, "ID", None) == "Saver"]
+    if not savers:
+        return
+
+    # Whether instances should be passthrough based on new value
+    passthrough = not new_value
+    with comp_lock_and_undo_chunk(comp,
+                                  undo_queue_name="Change instance "
+                                                  "active state"):
+        for tool in savers:
+            attrs = tool.GetAttrs()
+            current = attrs["TOOLB_PassThrough"]
+            if current != passthrough:
+                tool.SetAttrs({"TOOLB_PassThrough": passthrough})