qgraphicsrectitem

I am trying to design something like a timeline view for my video player. I decided to use QTableWidget as the timeline since it suits my purpose. My widget looks like this: I want the green line to run through the widget when i click on play. Here is my MVCE example: //View.cpp View::View(QWidget* parent) : QGraphicsView(parent) { QGraphicsScene* scene = new QGraphicsScene(this); TableWidget* wgt = new TableWidget; scene->addWidget(wgt); QGraphicsLineItem* item = new QGraphicsLineItem(30, 12, 30, wgt->height() - 9); item->setPen(QPen(QBrush(Qt::green), 3)); item->setFlags(QGraphicsItem:

I have added a widget to a graphic scene QGraphicScene through a QGraphicsProxyWidget. To move it I have set QGraphicsRectitem as its parent. The widget is resized with the use of a sizegrip. The first time I create an object I can enlarge it upto some dimension. The second time I can enlarge it less than the first one. The third time less than the second one and so on. It seems to me that it behaves randomly. Why is this happening? Here is the code: void GraphicsView::dropEvent(QDropEvent *event)// subclass of QGraphicsView { if(event->mimeData()->text() == "Dial") { auto *dial= new Dial; //