Enable nested MapItemViews

This change allows MapItemView to use a MapItem, MapItemGroup or
MapItemView as delegate.
To achieve this, MapItemView base class also changes from QObject to
MapItemGroup, effectively making MapItemView a MapItemGroup.
Note, though, that MapItemGroup API in Map should be avoided, when
dealing with a MapItemView, and only MapItemView-specific API should be
used.

Tests and example coming after

[ChangeLog][QtLocation] Enabled nesting of MapItemView. This
required a behavioral change, as MapItemView is now a MapItemGroup,
not anymore a plain QObject.
Due to a bug, MapItemView was previously not a Qt Quick Item, making
it possible to create it as a child of any QObject. This has now been
fixed, so if you happen to have a MapItemView in your scene which is
not a child of a Qt Quick Item, you will get an error message.

Task-number: QTBUG-62683
Task-number: QTBUG-62397
Change-Id: Id97e480429e7f952a541fe88df5c01317afeac18
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 10 insertions, 2 deletions

diff --git a/tests/auto/declarative_ui/tst_map_itemview.qml b/tests/auto/declarative_ui/tst_map_itemview.qml
index 097212ca..0ab9d494 100644
--- a/tests/auto/declarative_ui/tst_map_itemview.qml
+++ b/tests/auto/declarative_ui/tst_map_itemview.qml
@@ -28,7 +28,7 @@
 
 import QtQuick 2.0
 import QtTest 1.0
-import QtLocation 5.6
+import QtLocation 5.12
 import QtPositioning 5.5
 import QtLocation.Test 5.5
 
@@ -49,6 +49,7 @@ Item {
     MapItemView {
         id: routeItemViewExtra
         model: routeModel
+        incubateDelegates: false
         delegate: Component {
             MapRoute {
                 route:  routeData
@@ -58,6 +59,10 @@ Item {
 
     MapItemView {
         id: listModelItemViewExtra
+        objectName: "listModelItemViewExtra"
+        incubateDelegates: false
+        add: null
+        remove: null
         model: ListModel {
             id: testingListModelExtra
             ListElement { lat: 11; lon: 31 }
@@ -252,6 +257,9 @@ Item {
 
         MapItemView {
             id: listModelItemView
+            incubateDelegates: false
+            add: null
+            remove: null
             model: ListModel {
                 id: testingListModel
                 ListElement { lat: 11; lon: 31 }
@@ -487,7 +495,7 @@ Item {
             testingListModelExtra.clear()
             tryCompare(mapForTestingListModel, "mapItemsLength", 0)
             mapForTestingListModel.removeMapItemView(listModelItemViewExtra)
-
+            tryCompare(mapForTestingListModel, "mapItemsLength", 0)
             mapForTestingListModel.addMapItemView(listModelItemView)
             tryCompare(mapForTestingListModel, "mapItemsLength", 3)