QmlDesigner: Preview size is now changeable

You can now change the preview size with
rootModelNode.setAuxiliaryData("previewSize@Internal", size);
If size is null it will use the bounding box size.

Change-Id: Icbe747ccc5a2e26e79783825d2ed94ecc640012b
Reviewed-by: Michael Winkelmann <michael.winkelmann@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5previewnodeinstanceserver.cpp

@@ -25,10 +25,12 @@
 
 #include "qt5previewnodeinstanceserver.h"
 
-#include "nodeinstanceclientinterface.h"
-#include "statepreviewimagechangedcommand.h"
+#include "changepreviewimagesizecommand.h"
 #include "createscenecommand.h"
+#include "nodeinstanceclientinterface.h"
 #include "removesharedmemorycommand.h"
+#include "statepreviewimagechangedcommand.h"
+
 #include <QQuickView>
 #include <QQuickItem>
 #include <designersupportdelegate.h>
@@ -100,7 +102,9 @@ QImage Qt5PreviewNodeInstanceServer::renderPreviewImage()
     QRectF boundingRect = rootNodeInstance().boundingRect();
 
     QSize previewImageSize = boundingRect.size().toSize();
-    previewImageSize.scale(QSize(160, 160), Qt::KeepAspectRatio);
+
+    if (!m_previewSize.isNull())
+        previewImageSize.scale(m_previewSize, Qt::KeepAspectRatio);
 
     QImage previewImage = rootNodeInstance().renderPreviewImage(previewImageSize);
 
@@ -113,4 +117,12 @@ void QmlDesigner::Qt5PreviewNodeInstanceServer::removeSharedMemory(const QmlDesi
         ImageContainer::removeSharedMemorys(command.keyNumbers());
 }
 
+void Qt5PreviewNodeInstanceServer::changePreviewImageSize(
+    const ChangePreviewImageSizeCommand &command)
+{
+    m_previewSize = command.size;
+
+    collectItemChangesAndSendChangeCommands();
+}
+
 } // namespace QmlDesigner