diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gui/graphicsview/qgraphicsview.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/gui/graphicsview/qgraphicsview.cpp b/src/gui/graphicsview/qgraphicsview.cpp index 2f7f57a..9b0e12d 100644 --- a/src/gui/graphicsview/qgraphicsview.cpp +++ b/src/gui/graphicsview/qgraphicsview.cpp @@ -804,10 +804,17 @@ void QGraphicsViewPrivate::itemUpdated(QGraphicsItem *item, const QRectF &rect) if (item->isClipped()) { // Minimize unnecessary redraw. QGraphicsItem *p = item; + QTransform xform; + QGraphicsItem *lastTransformItem = 0; while ((p = p->d_ptr->parent)) { if (p->flags() & QGraphicsItem::ItemClipsChildrenToShape) { - updateRect &= p->itemTransform(item).mapRect(p->boundingRect()); - if (updateRect.isNull()) + if (!lastTransformItem) + xform = item->itemTransform(p); + else + xform *= lastTransformItem->itemTransform(p); + lastTransformItem = p; + updateRect &= xform.inverted().mapRect(p->boundingRect()); + if (updateRect.isEmpty()) return; } @@ -815,7 +822,7 @@ void QGraphicsViewPrivate::itemUpdated(QGraphicsItem *item, const QRectF &rect) break; } - if (updateRect.isNull()) + if (updateRect.isEmpty()) return; } |