Move event delivery from QQWindow to QQuickDeliveryAgent

QQuickWindow owns QQuickRootItem which owns QQuickDeliveryAgent, so
for every window there's an object responsible for event delivery,
while the window itself is mainly responsible for rendering (separation
of concerns).  However, QQuickRootItem and QQuickDeliveryAgent can now
be used in cases where the scene doesn't directly belong to a window,
such as when a Qt Quick sub-scene is mapped somewhere into a Qt Quick 3D
scene.  In that case, we must remember which delivery agent was in use
at the time when a QEventPoint is grabbed and deliver subsequent updates
via the same DA.  There's also a QQuickDeliveryAgent::Transform
abstraction which subscene-management code (such as QQuick3DViewport)
can implement, to provide a formula to map the window's scene
coordinates to subscene coordinates; if defined, it will be used
during delivery of subsequent updates to existing grabbers.

Task-number: QTBUG-84870
Change-Id: I70b433f7ebb05d2e60214ff3192e05da0aa84a42
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/quick/handlers/qquickdraghandler.cpp b/src/quick/handlers/qquickdraghandler.cpp
index 0794b86b11..e5e9b03f32 100644
--- a/src/quick/handlers/qquickdraghandler.cpp
+++ b/src/quick/handlers/qquickdraghandler.cpp
@@ -247,7 +247,7 @@ void QQuickDragHandler::handlePointerEventImpl(QPointerEvent *event)
                     m_pressedInsideTarget &= target()->contains(localPressPos);
                     m_pressTargetPos = targetCentroidPosition();
                 }
-                // QQuickWindowPrivate::deliverToPassiveGrabbers() skips subsequent delivery if the event is filtered.
+                // QQuickDeliveryAgentPrivate::deliverToPassiveGrabbers() skips subsequent delivery if the event is filtered.
                 // (That affects behavior for mouse but not for touch, because Flickable only handles mouse.)
                 // So we have to compensate by accepting the event here to avoid any parent Flickable from
                 // getting the event via direct delivery and grabbing too soon.