Fix setting the focus reason in Qt Quick Controls

Focus might go to the content item, which is a QQuickItem that has no
concept of either focusPolicy or focusReason. For Qt Quick Controls to
update the focusReason property when an item in it's item tree receives
or loses focus, it has to install itself as a notification listener on
the item.

However, QQuickItemChangeListener didn't have any notification type for
focus changes.

Add the new change type, and notify listeners whenever the an item's
focus changes. Focus scoping might mean that an item never loses focus,
but nevertheless loses active focus.

To be able to update items recursively with the correct focusReason, add
the reason parameter to the QQuickDeliveryAgent helper function.

Fixes: QTBUG-75862
Pick-to: 6.2
Change-Id: I3d19b722bb07b55416b8cfbb4a9cdb0edd0da3ec
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/quick/items/qquickitem_p.h b/src/quick/items/qquickitem_p.h
index 576d392a26..6be15c4f3a 100644
--- a/src/quick/items/qquickitem_p.h
+++ b/src/quick/items/qquickitem_p.h
@@ -331,6 +331,7 @@ public:
         ImplicitWidth = 0x100,
         ImplicitHeight = 0x200,
         Enabled = 0x400,
+        Focus = 0x800,
         AllChanges = 0xFFFFFFFF
     };