Avoid "Unable to assign...." errors

i.e. "Unable to assign [undefined] to Sink::ApplicationDomain::Folder::Ptr"
Because qml does not know how to assign a default-constructed value we
have to use conditional bindings. The !! operator checks for
availability of the property which then triggers the binding.

I assume an alternative viable approach would be to expose all
controller properties as QVariants only, in which case an assignment
from null would work (it doesn't for Folder::Ptr).

1 files changed, 10 insertions, 2 deletions

diff --git a/components/mail/contents/ui/Mail.qml b/components/mail/contents/ui/Mail.qml
index b88e846d..c400d8f3 100644
--- a/components/mail/contents/ui/Mail.qml
+++ b/components/mail/contents/ui/Mail.qml
@@ -84,12 +84,20 @@ Controls2.ApplicationWindow {
     //Controller
     KubeFramework.MailController {
         id: mailController
-        threadLeader: mailListView.currentMail
+        Binding on threadLeader {
+            //!! checks for the availability of the type
+            when: !!mailListView.currentMail
+            value: mailListView.currentMail
+        }
     }
 
     KubeFramework.FolderController {
         id: folderController
-        folder: folderListView.currentFolder
+        Binding on folder {
+            //!! checks for the availability of the type
+            when: !!folderListView.currentFolder
+            value: folderListView.currentFolder
+        }
     }
 
     //BEGIN Shortcuts