Document parenting behaviour of delegates in QML ListView and Component.

ListView:
As delegates are instantiated in ListView, they are parented to views
contentItem. This is now explicitly stated in the documentation.

Component:
Components are not derived from Items, so they cannot hook to anchors.

Task-number: QTBUG-24822
Change-Id: I09e04fbcc01b2858c039d22f9600ef201a9a91ab
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

2 files changed, 4 insertions, 1 deletions

diff --git a/src/qml/qml/qqmlcomponent.cpp b/src/qml/qml/qqmlcomponent.cpp
index e59116a7c1..850ee53ab7 100644
--- a/src/qml/qml/qqmlcomponent.cpp
+++ b/src/qml/qml/qqmlcomponent.cpp
@@ -231,7 +231,8 @@ static inline QString buildTypeNameForDebug(const QMetaObject *metaObject)
     because it is defined inside a \c Component. The component encapsulates the
     QML types within, as if they were defined in a separate QML
     file, and is not loaded until requested (in this case, by the
-    two \l Loader objects).
+    two \l Loader objects). Because Component is not derived from Item, you cannot
+    anchor anything to it.
 
     Defining a \c Component is similar to defining a \l {QML Document}{QML document}.
     A QML document has a single top-level item that defines the behaviors and
diff --git a/src/quick/items/qquicklistview.cpp b/src/quick/items/qquicklistview.cpp
index d79f535fd4..558fbcd405 100644
--- a/src/quick/items/qquicklistview.cpp
+++ b/src/quick/items/qquicklistview.cpp
@@ -1690,6 +1690,7 @@ bool QQuickListViewPrivate::flick(AxisData &data, qreal minExtent, qreal maxExte
     The list view itself is a focus scope (see \l{Keyboard Focus in Qt Quick} for more details).
 
     Delegates are instantiated as needed and may be destroyed at any time.
+    They are parented to ListView's \l {Flickable::contentItem}{contentItem}, not to the view itself.
     State should \e never be stored in a delegate.
 
     ListView attaches a number of properties to the root item of the delegate, for example
@@ -1862,6 +1863,7 @@ QQuickListView::~QQuickListView()
     alignment of items.
 
     \note Delegates are instantiated as needed and may be destroyed at any time.
+    They are parented to ListView's \l {Flickable::contentItem}{contentItem}, not to the view itself.
     State should \e never be stored in a delegate.
 */
 /*!