Views do not notify count changes properly

The views don't have a valid count until both a model and a delegate
are provided.  But, countChanged() is not called when a delegate is
set after the model, so bindings to count were not evaluated.  Also
test that count is updated for insertion/removal

Change-Id: Ic82039a624c02f0bdb2862ac7a6e215df75bb314
Task-number: QTBUG-19037
Reviewed-by: Bea Lam
(cherry picked from commit 4fbcb6a531bf424a8dbbbd0ca2947d9e15118885)

3 files changed, 9 insertions, 0 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativegridview.cpp b/src/declarative/graphicsitems/qdeclarativegridview.cpp
index f30831d7d9..a3395a4fef 100644
--- a/src/declarative/graphicsitems/qdeclarativegridview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativegridview.cpp
@@ -1499,6 +1499,7 @@ void QDeclarativeGridView::setDelegate(QDeclarativeComponent *delegate)
         d->ownModel = true;
     }
     if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) {
+        int oldCount = dataModel->count();
         dataModel->setDelegate(delegate);
         if (isComponentComplete()) {
             for (int i = 0; i < d->visibleItems.count(); ++i)
@@ -1516,6 +1517,8 @@ void QDeclarativeGridView::setDelegate(QDeclarativeComponent *delegate)
             }
             d->moveReason = QDeclarativeGridViewPrivate::Other;
         }
+        if (oldCount != dataModel->count())
+            emit countChanged();
         emit delegateChanged();
     }
 }
diff --git a/src/declarative/graphicsitems/qdeclarativelistview.cpp b/src/declarative/graphicsitems/qdeclarativelistview.cpp
index 3190d7e209..27300c492b 100644
--- a/src/declarative/graphicsitems/qdeclarativelistview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativelistview.cpp
@@ -1813,6 +1813,7 @@ void QDeclarativeListView::setDelegate(QDeclarativeComponent *delegate)
         d->ownModel = true;
     }
     if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) {
+        int oldCount = dataModel->count();
         dataModel->setDelegate(delegate);
         if (isComponentComplete()) {
             for (int i = 0; i < d->visibleItems.count(); ++i)
@@ -1831,6 +1832,8 @@ void QDeclarativeListView::setDelegate(QDeclarativeComponent *delegate)
             }
             d->updateViewport();
         }
+        if (oldCount != dataModel->count())
+            emit countChanged();
     }
     emit delegateChanged();
 }
diff --git a/src/declarative/graphicsitems/qdeclarativepathview.cpp b/src/declarative/graphicsitems/qdeclarativepathview.cpp
index aed849bd39..be2bd60fcd 100644
--- a/src/declarative/graphicsitems/qdeclarativepathview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativepathview.cpp
@@ -1021,9 +1021,12 @@ void QDeclarativePathView::setDelegate(QDeclarativeComponent *delegate)
         d->ownModel = true;
     }
     if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) {
+        int oldCount = dataModel->count();
         dataModel->setDelegate(delegate);
         d->modelCount = dataModel->count();
         d->regenerate();
+        if (oldCount != dataModel->count())
+            emit countChanged();
         emit delegateChanged();
     }
 }