positionViewAtIndex can fail when positioned near end of list.

We positioned the view beyond the bounds, which in some cases resulted
in only one item being created.  Combined with a bug in the bounds
fixup very many items were created.

Task-number: QT-4441
Reviewed-by: Michael Brasser

4 files changed, 18 insertions, 5 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativeflickable.cpp b/src/declarative/graphicsitems/qdeclarativeflickable.cpp
index 4aaec38..dc7536e 100644
--- a/src/declarative/graphicsitems/qdeclarativeflickable.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeflickable.cpp
@@ -299,7 +299,7 @@ void QDeclarativeFlickablePrivate::fixup(AxisData &data, qreal minExtent, qreal
             timeline.move(data.move, maxExtent - dist/2, QEasingCurve(QEasingCurve::InQuad), fixupDuration/4);
             timeline.move(data.move, maxExtent, QEasingCurve(QEasingCurve::OutExpo), 3*fixupDuration/4);
         } else {
-            timeline.set(data.move, minExtent);
+            timeline.set(data.move, maxExtent);
         }
     }
     vTime = timeline.time();
diff --git a/src/declarative/graphicsitems/qdeclarativegridview.cpp b/src/declarative/graphicsitems/qdeclarativegridview.cpp
index 89d7493..4c04a6b 100644
--- a/src/declarative/graphicsitems/qdeclarativegridview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativegridview.cpp
@@ -2165,6 +2165,7 @@ void QDeclarativeGridView::positionViewAtIndex(int index, int mode)
     if (d->layoutScheduled)
         d->layout();
     qreal pos = d->position();
+    qreal maxExtent = d->flow == QDeclarativeGridView::LeftToRight ? -maxYExtent() : -maxXExtent();
     FxGridItem *item = d->visibleItem(index);
     if (!item) {
         int itemPos = d->rowPosAt(index);
@@ -2172,7 +2173,7 @@ void QDeclarativeGridView::positionViewAtIndex(int index, int mode)
         QList<FxGridItem*> oldVisible = d->visibleItems;
         d->visibleItems.clear();
         d->visibleIndex = index - index % d->columns;
-        d->setPosition(itemPos);
+        d->setPosition(qMin(qreal(itemPos), maxExtent));
         // now release the reference to all the old visible items.
         for (int i = 0; i < oldVisible.count(); ++i)
             d->releaseItem(oldVisible.at(i));
@@ -2202,7 +2203,6 @@ void QDeclarativeGridView::positionViewAtIndex(int index, int mode)
             if (itemPos < pos)
                 pos = itemPos;
         }
-        qreal maxExtent = d->flow == QDeclarativeGridView::LeftToRight ? -maxYExtent() : -maxXExtent();
         pos = qMin(pos, maxExtent);
         qreal minExtent = d->flow == QDeclarativeGridView::LeftToRight ? -minYExtent() : -minXExtent();
         pos = qMax(pos, minExtent);
diff --git a/src/declarative/graphicsitems/qdeclarativelistview.cpp b/src/declarative/graphicsitems/qdeclarativelistview.cpp
index b4fd571..b4b3fa7 100644
--- a/src/declarative/graphicsitems/qdeclarativelistview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativelistview.cpp
@@ -2603,6 +2603,7 @@ void QDeclarativeListView::positionViewAtIndex(int index, int mode)
         d->layout();
     qreal pos = d->position();
     FxListItem *item = d->visibleItem(index);
+    qreal maxExtent = d->orient == QDeclarativeListView::Vertical ? -maxYExtent() : -maxXExtent();
     if (!item) {
         int itemPos = d->positionAt(index);
         // save the currently visible items in case any of them end up visible again
@@ -2610,7 +2611,7 @@ void QDeclarativeListView::positionViewAtIndex(int index, int mode)
         d->visibleItems.clear();
         d->visiblePos = itemPos;
         d->visibleIndex = index;
-        d->setPosition(itemPos);
+        d->setPosition(qMin(qreal(itemPos), maxExtent));
         // now release the reference to all the old visible items.
         for (int i = 0; i < oldVisible.count(); ++i)
             d->releaseItem(oldVisible.at(i));
@@ -2640,7 +2641,6 @@ void QDeclarativeListView::positionViewAtIndex(int index, int mode)
             if (itemPos < pos)
                 pos = itemPos;
         }
-        qreal maxExtent = d->orient == QDeclarativeListView::Vertical ? -maxYExtent() : -maxXExtent();
         pos = qMin(pos, maxExtent);
         qreal minExtent = d->orient == QDeclarativeListView::Vertical ? -minYExtent() : -minXExtent();
         pos = qMax(pos, minExtent);
diff --git a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
index b343010..9b6f04c 100644
--- a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
+++ b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
@@ -1329,6 +1329,19 @@ void tst_QDeclarativeListView::positionViewAtIndex()
         QTRY_COMPARE(item->y(), i*20.);
     }
 
+    // Position at End using last index
+    listview->positionViewAtIndex(model.count()-1, QDeclarativeListView::End);
+    QTRY_COMPARE(listview->contentY(), 480.);
+
+    // Confirm items positioned correctly
+    itemCount = findItems<QDeclarativeItem>(contentItem, "wrapper").count();
+    for (int i = 24; i < model.count(); ++i) {
+        QDeclarativeItem *item = findItem<QDeclarativeItem>(contentItem, "wrapper", i);
+        if (!item) qWarning() << "Item" << i << "not found";
+        QTRY_VERIFY(item);
+        QTRY_COMPARE(item->y(), i*20.);
+    }
+
     // Position at End
     listview->positionViewAtIndex(20, QDeclarativeListView::End);
     QTRY_COMPARE(listview->contentY(), 100.);