Avoid crash on shutdown if model is destroyed before view.

2 files changed, 10 insertions, 6 deletions

diff --git a/src/declarative/graphicsitems/qmlgraphicsgridview.cpp b/src/declarative/graphicsitems/qmlgraphicsgridview.cpp
index 890d3ad..7105300 100644
--- a/src/declarative/graphicsitems/qmlgraphicsgridview.cpp
+++ b/src/declarative/graphicsitems/qmlgraphicsgridview.cpp
@@ -151,7 +151,7 @@ class QmlGraphicsGridViewPrivate : public QmlGraphicsFlickablePrivate
 
 public:
     QmlGraphicsGridViewPrivate()
-    : model(0), currentItem(0), flow(QmlGraphicsGridView::LeftToRight)
+    : currentItem(0), flow(QmlGraphicsGridView::LeftToRight)
     , visiblePos(0), visibleIndex(0) , currentIndex(-1)
     , cellWidth(100), cellHeight(100), columns(1), requestedIndex(-1)
     , highlightComponent(0), highlight(0), trackedItem(0)
@@ -307,7 +307,7 @@ public:
         }
     }
 
-    QmlGraphicsVisualModel *model;
+    QGuard<QmlGraphicsVisualModel> model;
     QVariant modelVariant;
     QList<FxGridItem*> visibleItems;
     QHash<QmlGraphicsItem*,int> unrequestedItems;
@@ -350,6 +350,7 @@ void QmlGraphicsGridViewPrivate::init()
 
 void QmlGraphicsGridViewPrivate::clear()
 {
+    qDebug() << "clearing items" << visibleItems.count();
     for (int i = 0; i < visibleItems.count(); ++i)
         releaseItem(visibleItems.at(i));
     visibleItems.clear();
@@ -384,13 +385,16 @@ FxGridItem *QmlGraphicsGridViewPrivate::createItem(int modelIndex)
 void QmlGraphicsGridViewPrivate::releaseItem(FxGridItem *item)
 {
     Q_Q(QmlGraphicsGridView);
-    if (!item)
+    if (!item || !model)
         return;
     if (trackedItem == item) {
         QObject::disconnect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged()));
         QObject::disconnect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged()));
         trackedItem = 0;
     }
+    qDebug() << "release" << item;
+    qDebug() << " item" << item->item;
+    qDebug() << " model" << model;
     if (model->release(item->item) == 0) {
         // item was not destroyed, and we no longer reference it.
         unrequestedItems.insert(item->item, model->indexOf(item->item, q));
diff --git a/src/declarative/graphicsitems/qmlgraphicslistview.cpp b/src/declarative/graphicsitems/qmlgraphicslistview.cpp
index ad0aa04..8fb7c84 100644
--- a/src/declarative/graphicsitems/qmlgraphicslistview.cpp
+++ b/src/declarative/graphicsitems/qmlgraphicslistview.cpp
@@ -210,7 +210,7 @@ class QmlGraphicsListViewPrivate : public QmlGraphicsFlickablePrivate, private Q
 
 public:
     QmlGraphicsListViewPrivate()
-        : model(0), currentItem(0), orient(QmlGraphicsListView::Vertical)
+        : currentItem(0), orient(QmlGraphicsListView::Vertical)
         , visiblePos(0), visibleIndex(0)
         , averageSize(100.0), currentIndex(-1), requestedIndex(-1)
         , highlightRangeStart(0), highlightRangeEnd(0)
@@ -495,7 +495,7 @@ public:
     virtual void flickX(qreal velocity);
     virtual void flickY(qreal velocity);
 
-    QmlGraphicsVisualModel *model;
+    QGuard<QmlGraphicsVisualModel> model;
     QVariant modelVariant;
     QList<FxListItem*> visibleItems;
     QHash<QmlGraphicsItem*,int> unrequestedItems;
@@ -615,7 +615,7 @@ FxListItem *QmlGraphicsListViewPrivate::createItem(int modelIndex)
 void QmlGraphicsListViewPrivate::releaseItem(FxListItem *item)
 {
     Q_Q(QmlGraphicsListView);
-    if (!item)
+    if (!item || !model)
         return;
     if (trackedItem == item) {
         const char *notifier1 = orient == QmlGraphicsListView::Vertical ? SIGNAL(yChanged()) : SIGNAL(xChanged());