What is the proper things to be done in QQuickItem::updatePaintNode() ?
QML and Qt Quick
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This is an update of my previous question:
http://qt-project.org/forums/viewthread/49653/Finally I located the issue inside updatePaintNode function. I minimized the related code into several lines:
@
// Profile3DWidget is a subclass of QQuickItem
QSGNode* Profile3DWidget::updatePaintNode(QSGNode * old_node, UpdatePaintNodeData * data)
{
if (!old_node)
{
old_node = new QSGGeometryNode();
}
}
@
The program crashes. But if I change the created node class to QSGNode, the program will not crash:
@
// Profile3DWidget is a subclass of QQuickItem
QSGNode* Profile3DWidget::updatePaintNode(QSGNode * old_node, UpdatePaintNodeData * data)
{
if (!old_node)
{
old_node = new QSGNode();
}
}
@
So what should I do inside this function? Thanks!!