Hi,

I'm having some trouble to resize the scene to the view size.

Here is the code:

bakgroundview.h
Qt Code: 
  1. #ifndef BACKGROUNDVIEW_H
  2. #define BACKGROUNDVIEW_H
  3.  
  4. #include <QObject>
  5. #include <QGraphicsView>
  6. #include <QGraphicsScene>
  7.  
  8. class BackgroundView : public QGraphicsView
  9. {
  10.     Q_OBJECT
  11. public:
  12.     BackgroundView(QGraphicsView *parent=0);
  13.     ~BackgroundView() {};
  14.  
  15. signals:
  16.  
  17. public slots:
  18.  
  19. private:
  22.  
  23. protected:
  24.     void resizeEvent(QResizeEvent *event);
  25. };
  26.  
  27. #endif // BACKGROUNDVIEW_H
To copy to clipboard, switch view to plain text mode 

bakgroundview.cpp
Qt Code: 
  1. #include <QGraphicsLineItem>
  2. #include <QResizeEvent>
  3.  
  4. #include "backgroundview.h"
  5.  
  6. BackgroundView::BackgroundView(QGraphicsView *parent)
  7.     : QGraphicsView(parent)
  8. {
  11.  
  12.     scene->setSceneRect(0,0,view->width(),view->height());
  13.  
  14.     QGraphicsLineItem* line = new QGraphicsLineItem ( 0,0, scene->width(), 0 );
  15.     QGraphicsLineItem* line2 = new QGraphicsLineItem ( scene->width(), 0 , scene->width(), scene->height() );
  16.     QGraphicsLineItem* line3 = new QGraphicsLineItem ( scene->width(), scene->height(), 0, scene->height() );
  17.     QGraphicsLineItem* line4 = new QGraphicsLineItem ( 0, 0, 0, scene->height() );
  18.  
  19.     scene->addItem(line);
  20.     scene->addItem(line2);
  21.     scene->addItem(line3);
  22.     scene->addItem(line4);
  23.  
  24.     setScene(scene);
  25. }
  26.  
  27. void BackgroundView::resizeEvent(QResizeEvent *event)
  28. {
  29.     //scene->setSceneRect(0, 0, event->size().width(), event->size().height());
  30.     QGraphicsView::resizeEvent(event);
  31. }
To copy to clipboard, switch view to plain text mode 

main.cpp
Qt Code: 
  1. #include <QApplication>
  2. #include "backgroundview.h"
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication app(argc, argv);
  7.  
  8.  
  9.     BackgroundView BgView;
  10.     BgView.showMaximized();
  11.  
  12.     return app.exec();
  13. }
To copy to clipboard, switch view to plain text mode 

When I remove the comment from the scene resize line, the window just close realy fast with an error.

How can I resize the scene to view every time the view was resized?

Thanks