GridView and ListView bug fixes

ListView and GridView check before accessing an empty model.
Fixed issue with undefined header.
Current index initialised properly when dynamically creating
ListModel items with javascript.

Change-Id: I121c0626db6eb7ccaab689dfc750e0d03773d90f
Task-number: QTBUG-15877
Reviewed-by: Joona Petrell

2 files changed, 37 insertions, 36 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativegridview.cpp b/src/declarative/graphicsitems/qdeclarativegridview.cpp
index 39fa8e8..2eeadf4 100644
--- a/src/declarative/graphicsitems/qdeclarativegridview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativegridview.cpp
@@ -73,22 +73,22 @@ public:
         if (view->flow() == QDeclarativeGridView::LeftToRight) {
             rowPos = item->y();
         } else {
-            if (view->layoutDirection() == Qt::LeftToRight)
-                rowPos = item->x();
-            else
+            if (view->layoutDirection() == Qt::RightToLeft)
                 rowPos = -view->cellWidth()-item->x();
+            else
+                rowPos = item->x();
         }
         return rowPos;
     }
     qreal colPos() const {
         qreal colPos = 0;
         if (view->flow() == QDeclarativeGridView::LeftToRight) {
-            if (view->layoutDirection() == Qt::LeftToRight) {
-                colPos = item->x();
-            } else {
+            if (view->layoutDirection() == Qt::RightToLeft) {
                 int colSize = view->cellWidth();
                 int columns = view->width()/colSize;
                 colPos = colSize * (columns-1) - item->x();
+            } else {
+                colPos = item->x();
             }
         } else {
             colPos = item->y();
@@ -101,25 +101,25 @@ public:
         if (view->flow() == QDeclarativeGridView::LeftToRight) {
             return item->y() + view->cellHeight() - 1;
         } else {
-            if (view->layoutDirection() == Qt::LeftToRight)
-                return item->x() + view->cellWidth() - 1;
-            else
+            if (view->layoutDirection() == Qt::RightToLeft)
                 return -item->x() - 1;
+            else
+                return item->x() + view->cellWidth() - 1;
         }
     }
     void setPosition(qreal col, qreal row) {
-        if (view->layoutDirection() == Qt::LeftToRight) {
-            if (view->flow() == QDeclarativeGridView::LeftToRight)
-                item->setPos(QPointF(col, row));
-            else
-                item->setPos(QPointF(row, col));
-        } else {
+        if (view->layoutDirection() == Qt::RightToLeft) {
             if (view->flow() == QDeclarativeGridView::LeftToRight) {
                 int columns = view->width()/view->cellWidth();
                 item->setPos(QPointF((view->cellWidth() * (columns-1) - col), row));
             } else {
                 item->setPos(QPointF(-view->cellWidth()-row, col));
             }
+        } else {
+            if (view->flow() == QDeclarativeGridView::LeftToRight)
+                item->setPos(QPointF(col, row));
+            else
+                item->setPos(QPointF(row, col));
         }
 
     }
@@ -697,7 +697,7 @@ void QDeclarativeGridViewPrivate::layout()
         qreal rowPos = visibleItems.first()->rowPos();
         qreal colPos = visibleItems.first()->colPos();
         int col = visibleIndex % columns;
-        if (colPos != col * colSize() || isRightToLeftTopToBottom()) {
+        if (colPos != col * colSize()) {
             colPos = col * colSize();
             visibleItems.first()->setPosition(colPos, rowPos);
         }
@@ -747,7 +747,7 @@ void QDeclarativeGridViewPrivate::updateUnrequestedPositions()
             if (isRightToLeftTopToBottom())
                 item->setPos(QPointF(-rowPosAt(*it)-item->width(), colPosAt(*it)));
             else
-                item->setPos(QPointF(rowPosAt(*it), (columns-1)*colSize()-colPosAt(*it)));
+                item->setPos(QPointF(rowPosAt(*it), colPosAt(*it)));
         }
     }
 }
@@ -1032,7 +1032,9 @@ void QDeclarativeGridViewPrivate::fixup(AxisData &data, qreal minExtent, qreal m
             qreal bottomPos = qMax(bottomItem->rowPos() - highlightEnd, -minExtent);
             pos = qAbs(data.move + topPos) < qAbs(data.move + bottomPos) ? topPos : bottomPos;
         } else if (topItem) {
-            qreal headerPos = isRightToLeftTopToBottom() ? header->rowPos() + cellWidth - headerSize() : header->rowPos();
+            qreal headerPos = 0;
+            if (header)
+                headerPos = isRightToLeftTopToBottom() ? header->rowPos() + cellWidth - headerSize() : header->rowPos();
             if (topItem->index == 0 && header && tempPosition+highlightStart < headerPos+headerSize()/2) {
                 pos = isRightToLeftTopToBottom() ? - headerPos + highlightStart - size() : headerPos - highlightStart;
             } else {
@@ -2191,9 +2193,6 @@ qreal QDeclarativeGridView::maxXExtent() const
     if (d->flow == QDeclarativeGridView::LeftToRight)
         return QDeclarativeFlickable::maxXExtent();
     qreal extent;
-    if (!d->model || !d->model->count()) {
-        extent = 0;
-    }
     qreal highlightStart;
     qreal highlightEnd;
     qreal lastItemPosition;
@@ -2204,9 +2203,12 @@ qreal QDeclarativeGridView::maxXExtent() const
     } else {
         highlightStart = d->highlightRangeStart;
         highlightEnd = d->highlightRangeEnd;
-        lastItemPosition = d->rowPosAt(d->model->count()-1);
+        if (d->model && d->model->count())
+            lastItemPosition = d->rowPosAt(d->model->count()-1);
     }
-    if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) {
+    if (!d->model || !d->model->count()) {
+        extent = 0;
+    } else if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) {
         extent = -(lastItemPosition - highlightStart);
         if (highlightEnd != highlightStart)
             extent = d->isRightToLeftTopToBottom()
@@ -2725,7 +2727,7 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count)
         modelIndex = d->visibleIndex;
     }
 
-    qreal tempPos = d->isRightToLeftTopToBottom() ? -d->position()-d->size() : d->position();
+    qreal tempPos = d->isRightToLeftTopToBottom() ? -d->position()-d->size()+d->width()+1 : d->position();
     int to = d->buffer+tempPos+d->size()-1;
     int colPos = 0;
     int rowPos = 0;
@@ -2744,10 +2746,7 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count)
             }
         }
     } else if (d->itemCount == 0 && d->header) {
-        if (d->flow == QDeclarativeGridView::LeftToRight)
-            rowPos = d->headerSize();
-        else
-            colPos = d->headerSize();
+        rowPos = d->headerSize();
     }
 
     // Update the indexes of the following visible items.
@@ -2804,6 +2803,8 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count)
             d->updateCurrent(0);
         }
         emit currentIndexChanged();
+    } else if (d->itemCount == 0 && d->currentIndex == -1) {
+        setCurrentIndex(0);
     }
 
     // everything is in order now - emit add() signal
diff --git a/src/declarative/graphicsitems/qdeclarativelistview.cpp b/src/declarative/graphicsitems/qdeclarativelistview.cpp
index 6749657..486cec8 100644
--- a/src/declarative/graphicsitems/qdeclarativelistview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativelistview.cpp
@@ -329,6 +329,7 @@ public:
                 else
                     idx = visibleItems.at(idx)->index;
                 int count = modelIndex - idx - 1;
+
                 return (*(--visibleItems.constEnd()))->endPosition() + spacing + count * (averageSize + spacing) + 1;
             }
         }
@@ -1316,10 +1317,8 @@ void QDeclarativeListViewPrivate::flick(AxisData &data, qreal minExtent, qreal m
     if (velocity > 0) {
         if (data.move.value() < minExtent) {
             if (snapMode == QDeclarativeListView::SnapOneItem) {
-                if (FxListItem *item = isRightToLeft() ? nextVisibleItem() : firstVisibleItem()) {
+                if (FxListItem *item = isRightToLeft() ? nextVisibleItem() : firstVisibleItem())
                     maxDistance = qAbs(item->position() + dataValue);
-//                    qDebug() << "maxDist" << maxDistance << item->position() << dataValue;
-                }
             } else {
                 maxDistance = qAbs(minExtent - data.move.value());
             }
@@ -1329,10 +1328,8 @@ void QDeclarativeListViewPrivate::flick(AxisData &data, qreal minExtent, qreal m
     } else {
         if (data.move.value() > maxExtent) {
             if (snapMode == QDeclarativeListView::SnapOneItem) {
-                if (FxListItem *item = isRightToLeft() ? firstVisibleItem() : nextVisibleItem()) {
+                if (FxListItem *item = isRightToLeft() ? firstVisibleItem() : nextVisibleItem())
                     maxDistance = qAbs(item->position() + dataValue);
-//                    qDebug() << "maxDist2" << maxDistance << item->position() << dataValue;
-                }
             } else {
                 maxDistance = qAbs(maxExtent - data.move.value());
             }
@@ -2595,7 +2592,8 @@ qreal QDeclarativeListView::minXExtent() const
         qreal highlightEnd;
         qreal endPositionFirstItem;
         if (d->isRightToLeft()) {
-            endPositionFirstItem = d->positionAt(d->model->count()-1);
+            if (d->model && d->model->count())
+                endPositionFirstItem = d->positionAt(d->model->count()-1);
             highlightStart = d->highlightRangeStartValid
                     ? d->highlightRangeStart - (d->lastPosition()-endPositionFirstItem)
                     : d->size() - (d->lastPosition()-endPositionFirstItem);
@@ -2635,7 +2633,8 @@ qreal QDeclarativeListView::maxXExtent() const
         } else {
             highlightStart = d->highlightRangeStart;
             highlightEnd = d->highlightRangeEnd;
-            lastItemPosition = d->positionAt(d->model->count()-1);
+            if (d->model && d->model->count())
+                lastItemPosition = d->positionAt(d->model->count()-1);
         }
         if (!d->model || !d->model->count()) {
             d->maxExtent = 0;
@@ -3058,6 +3057,7 @@ void QDeclarativeListView::itemsInserted(int modelIndex, int count)
 
     qreal tempPos = d->isRightToLeft() ? -d->position()-d->size() : d->position();
     int index = d->visibleItems.count() ? d->mapFromModel(modelIndex) : 0;
+
     if (index < 0) {
         int i = d->visibleItems.count() - 1;
         while (i > 0 && d->visibleItems.at(i)->index == -1)