Don't attempt to destroy a null persisted item.

Persisted items are still only constructed on demand so we can't
assume the object is non null.

Change-Id: I1ce9563eb3b9fb1ae611e8afcf9c8c74f0563aec
Reviewed-by: Martin Jones <martin.jones@nokia.com>

2 files changed, 31 insertions, 18 deletions

diff --git a/tests/auto/qtquick2/qquickvisualdatamodel/data/create.qml b/tests/auto/qtquick2/qquickvisualdatamodel/data/create.qml
index 3475a0dace..9f4b754552 100644
--- a/tests/auto/qtquick2/qquickvisualdatamodel/data/create.qml
+++ b/tests/auto/qtquick2/qquickvisualdatamodel/data/create.qml
@@ -4,6 +4,8 @@ ListView {
     width: 200
     height: 200
 
+    property var persistentHandle
+
     model: VisualDataModel {
         id: visualModel
 
@@ -15,11 +17,6 @@ ListView {
             objectName: "delegate"
             width: 200
             height: 20
-
-            property bool destroyed: false
-
-
-            Component.onDestruction: destroyed = true
         }
     }
 }
diff --git a/tests/auto/qtquick2/qquickvisualdatamodel/tst_qquickvisualdatamodel.cpp b/tests/auto/qtquick2/qquickvisualdatamodel/tst_qquickvisualdatamodel.cpp
index f0e6228d29..9e27a202b2 100644
--- a/tests/auto/qtquick2/qquickvisualdatamodel/tst_qquickvisualdatamodel.cpp
+++ b/tests/auto/qtquick2/qquickvisualdatamodel/tst_qquickvisualdatamodel.cpp
@@ -1708,7 +1708,7 @@ void tst_qquickvisualdatamodel::create()
 
     QCOMPARE(listview->count(), 20);
 
-    QQuickItem *delegate;
+    QDeclarativeGuard<QQuickItem> delegate;
 
     // persistedItems.includeByDefault is true, so all items belong to persistedItems initially.
     QVERIFY(delegate = findItem<QQuickItem>(contentItem, "delegate", 1));
@@ -1725,55 +1725,60 @@ void tst_qquickvisualdatamodel::create()
 
     // Request an item instantiated by the view.
     QVERIFY(delegate = qobject_cast<QQuickItem *>(evaluate<QObject *>(visualModel, "items.create(1)")));
-    QCOMPARE(delegate, findItem<QQuickItem>(contentItem, "delegate", 1));
+    QCOMPARE(delegate.data(), findItem<QQuickItem>(contentItem, "delegate", 1));
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), true);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 1);
 
     evaluate<void>(delegate, "VisualDataModel.inPersistedItems = false");
     QCOMPARE(listview->count(), 20);
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), false);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(delegate);
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), false);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 0);
 
     // Request an item not instantiated by the view.
     QVERIFY(!findItem<QQuickItem>(contentItem, "delegate", 15));
     QVERIFY(delegate = qobject_cast<QQuickItem *>(evaluate<QObject *>(visualModel, "items.create(15)")));
-    QCOMPARE(delegate, findItem<QQuickItem>(contentItem, "delegate", 15));
+    QCOMPARE(delegate.data(), findItem<QQuickItem>(contentItem, "delegate", 15));
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), true);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 1);
 
     evaluate<void>(visualModel, "persistedItems.remove(0)");
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), true);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(!delegate);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 0);
 
     // Request an item not instantiated by the view, then scroll the view so it will request it.
     QVERIFY(!findItem<QQuickItem>(contentItem, "delegate", 16));
     QVERIFY(delegate = qobject_cast<QQuickItem *>(evaluate<QObject *>(visualModel, "items.create(16)")));
-    QCOMPARE(delegate, findItem<QQuickItem>(contentItem, "delegate", 16));
+    QCOMPARE(delegate.data(), findItem<QQuickItem>(contentItem, "delegate", 16));
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), true);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 1);
 
     evaluate<void>(listview, "positionViewAtIndex(19, ListView.End)");
     QCOMPARE(listview->count(), 20);
     evaluate<void>(delegate, "VisualDataModel.groups = [\"items\"]");
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), false);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(delegate);
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), false);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 0);
 
     // Request and release an item instantiated by the view, then scroll the view so it releases it.
     QVERIFY(findItem<QQuickItem>(contentItem, "delegate", 17));
     QVERIFY(delegate = qobject_cast<QQuickItem *>(evaluate<QObject *>(visualModel, "items.create(17)")));
-    QCOMPARE(delegate, findItem<QQuickItem>(contentItem, "delegate", 17));
+    QCOMPARE(delegate.data(), findItem<QQuickItem>(contentItem, "delegate", 17));
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), true);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 1);
 
     evaluate<void>(visualModel, "items.removeGroups(17, \"persistedItems\")");
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), false);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(delegate);
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), false);
     QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 0);
     evaluate<void>(listview, "positionViewAtIndex(1, ListView.Beginning)");
     QCOMPARE(listview->count(), 20);
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), true);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(!delegate);
 
     // Adding an item to the persistedItems group won't instantiate it, but if later requested by
     // the view it will be persisted.
@@ -1784,13 +1789,24 @@ void tst_qquickvisualdatamodel::create()
     QCOMPARE(listview->count(), 20);
     QVERIFY(delegate = findItem<QQuickItem>(contentItem, "delegate", 18));
     QCOMPARE(evaluate<bool>(delegate, "VisualDataModel.inPersistedItems"), true);
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), false);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(delegate);
     evaluate<void>(listview, "positionViewAtIndex(1, ListView.Beginning)");
     QCOMPARE(listview->count(), 20);
-    QCOMPARE(evaluate<bool>(delegate, "destroyed"), false);
+    QCoreApplication::sendPostedEvents(delegate, QEvent::DeferredDelete);
+    QVERIFY(delegate);
+
+    // Remove an uninstantiated but cached item from the persistedItems group.
+    evaluate<void>(visualModel, "items.addGroups(19, \"persistedItems\")");
+    QCOMPARE(evaluate<int>(visualModel, "persistedItems.count"), 2);
+    QVERIFY(!findItem<QQuickItem>(contentItem, "delegate", 19));
+     // Store a reference to the item so it is retained in the cache.
+    evaluate<void>(visualModel, "persistentHandle = items.get(19)");
+    QCOMPARE(evaluate<bool>(visualModel, "persistentHandle.inPersistedItems"), true);
+    evaluate<void>(visualModel, "items.removeGroups(19, \"persistedItems\")");
+    QCOMPARE(evaluate<bool>(visualModel, "persistentHandle.inPersistedItems"), false);
 }
 
-
 void tst_qquickvisualdatamodel::incompleteModel()
 {
     // VisualDataModel is first populated in componentComplete.  Verify various functions are