Hi,

I am trying to create a custom GraphicsItem that will set its width autocratically to the Scene width.
Qt Code: 
  1. sceneBoundingRect()
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sounds like what I need, but my Program crashes all the time.

Qt Code: 
  1. #include "customparentitem.h"
  2. #include <QDebug>
  3.  
  4. customparentitem::customparentitem()
  5. {
  6.     setFlag(ItemIsMovable);
  7. }
  8.  
  9. QRectF customparentitem::boundingRect() const
  10. {
  11.     qDebug() << this->sceneBoundingRect();
  12.     return QRectF(0,0,200,30);
  13. }
  14.  
  15. void customparentitem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
  16. {
  17.     QRectF temprec=boundingRect();
  18.     painter->drawRoundedRect(temprec.x(),temprec.y(),temprec.width(),temprec.height(),8,8);
  19. }
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The returned BoundingRect is just temporary until I get the desired output with qDebug().

Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3.  
  4. MainWindow::MainWindow(QWidget *parent) :
  5.     QMainWindow(parent),
  6.     ui(new Ui::MainWindow),
  7.     scene(new QGraphicsScene),
  8.     customitem(new customparentitem)
  9. {
  10.     ui->setupUi(this);
  11.  
  12.     ui->graphicsView->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
  13.     ui->graphicsView->setRenderHint(QPainter::Antialiasing);
  14.     scene->setSceneRect(ui->graphicsView->rect());
  15.  
  16.     scene->addItem(customitem);
  17.  
  18.     ui->graphicsView->setScene(scene);
  19. }
  20.  
  21. MainWindow::~MainWindow()
  22. {
  23.     delete ui;
  24. }
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This compiles just fine, but as said earlier crashes. Any ideas why?