Update the item when the DevicePixelRatio changes

Since the rendering of the item depends on the device pixel ratio then it
needs to be updated whenever this changes.

[ChangeLog][QQuickPaintedItem] When the device pixel ratio
is changed for the screen the item is rendered on then the item will be
updated.

Change-Id: Idf3c73faf0c13573c570fe22b5fb9e97fe1e66e2
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>

2 files changed, 8 insertions, 0 deletions

diff --git a/src/quick/items/qquickpainteditem.cpp b/src/quick/items/qquickpainteditem.cpp
index ad8d94d240..63e90a5cce 100644
--- a/src/quick/items/qquickpainteditem.cpp
+++ b/src/quick/items/qquickpainteditem.cpp
@@ -657,4 +657,11 @@ QSGTextureProvider *QQuickPaintedItem::textureProvider() const
     return d->textureProvider;
 }
 
+void QQuickPaintedItem::itemChange(ItemChange change, const ItemChangeData &value)
+{
+    if (change == ItemDevicePixelRatioHasChanged)
+        update();
+    QQuickItem::itemChange(change, value);
+}
+
 QT_END_NAMESPACE
diff --git a/src/quick/items/qquickpainteditem.h b/src/quick/items/qquickpainteditem.h
index bb4e7f1f85..ff559cd10e 100644
--- a/src/quick/items/qquickpainteditem.h
+++ b/src/quick/items/qquickpainteditem.h
@@ -115,6 +115,7 @@ protected:
     QQuickPaintedItem(QQuickPaintedItemPrivate &dd, QQuickItem *parent = Q_NULLPTR);
     QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *) Q_DECL_OVERRIDE;
     void releaseResources() Q_DECL_OVERRIDE;
+    void itemChange(ItemChange, const ItemChangeData &) Q_DECL_OVERRIDE;
 
 private Q_SLOTS:
     void invalidateSceneGraph();