Hello,

I have a program that uses the Qt Graphics Framework to draw different graphic items. For that I'm using the QGraphicsItem, QGraphicsScene and the QGraphicsView subclasses.
I put the QGraphicsView subclass in a QMainWindow (a subclass too).
When I'm starting my program I have 2 scroll bars one horizontal and one vertical. When I'm resizing the QMainWindow these scroll bars are remaining always with the same size ,or may be position, I don't know how to call it but they don't have the normal behavior...
When I put an item on the scene but in the border between the visible and the not visible part of the scene i.e. the item appears not entirely or when I put the item entirely in the not visible, by the view, zone the scroll bars are remaining too at the same state ...
The thing I want to have is that these scroll bars to be adaptable when I resize the main window or when I put some item outside the visible zone.
I hope that my explanation is clearly enough

Here is some source code of how I create the main windows with the view and the scene:

Viewer.h
Qt Code: 
  1. #ifndef VIEWER_H_
  2. #define VIEWER_H_
  3.  
  4. #include <QtGui>
  5.  
  6. class Scheme;
  7.  
  8. class Viewer : public QGraphicsView {
  9.  
  10. public:
  11. 	Viewer(Scheme *scheme);
  12. 	~Viewer();
  13.  
  14. protected:
  15. 	virtual void mouseMoveEvent(QMouseEvent *event);
  16. 	virtual void dragEnterEvent(QDragEnterEvent *event);
  17. 	virtual void dropEvent(QDropEvent *event);
  18. 	virtual void resizeEvent ( QResizeEvent * );
  19. };
  20.  
  21. #endif /* VIEWER_H_ */
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Viewer.cpp
Qt Code: 
  1. #include "Viewer.h"
  2. #include "Scheme.h"
  3.  
  4.  
  5. Viewer::Viewer(Scheme *scheme) : QGraphicsView(scheme){
  6. 	setRenderHint(QPainter::Antialiasing);
  7. 	setAcceptDrops(true);
  8. 	setDragMode(QGraphicsView::RubberBandDrag);
  9.  
  10.  
  11. }
  12.  
  13. Viewer::~Viewer(){ }
  14.  
  15. void Viewer::mouseMoveEvent(QMouseEvent *event){
  16. 	QGraphicsView::mouseMoveEvent(event);
  17. }
  18.  
  19. void Viewer::dragEnterEvent(QDragEnterEvent *event){
  20. 	QGraphicsView::dragEnterEvent(event);
  21. }
  22.  
  23.  
  24. void Viewer::dropEvent(QDropEvent *event){
  25. 	QGraphicsView::dropEvent(event);
  26. }
  27.  
  28.  
  29. void Viewer::resizeEvent ( QResizeEvent * ){
  30.  
  31. 	scene()->setSceneRect(0,0,width(), height());
  32.  
  33. }
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Scheme.h

Qt Code: 
  1. #ifndef SCHEME_H_
  2. #define SCHEME_H_
  3.  
  4.  
  5. #include <QGraphicsScene>
  6.  
  7. #include "Component.h"
  8.  
  9.  
  10. class Scheme : public QGraphicsScene {
  11.  
  12. 	Q_OBJECT
  13.  
  14. public:
  15.  
  16. 	Scheme(QMenu *compMenu, QObject *parent = 0);
  17. 	~Scheme();
  18.  
  19. protected:
  20.  
  21. 	void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
  22. 	void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);
  23. 	void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);
  24.  
  25. 	virtual void dragEnterEvent(QGraphicsSceneDragDropEvent * event );
  26. 	virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
  27. 	virtual void dropEvent (QGraphicsSceneDragDropEvent * event );
  28.  
  29. };
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Scheme.cpp

Qt Code: 
  1. #include <QtGui>
  2. #include <QLabel>
  3. #include "Scheme.h"
  4.  
  5.  
  6.  
  7. Scheme::Scheme(QMenu *compMenu, QObject *parent) : QGraphicsScene(parent) {
  8.  
  9. 	line = 0;
  10. 	mode = MoveComponent;
  11. 	componentType = Component::EventIO;
  12. 	this->compMenu = compMenu;
  13. 	compColor = Qt::black;
  14. }
  15.  
  16. Scheme::~Scheme(){
  17.  
  18. void Scheme::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent){
  19.  
  20. 	QGraphicsScene::mousePressEvent(mouseEvent);
  21. }
  22.  
  23. void Scheme::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent){
  24.  
  25. 			QGraphicsScene::mouseMoveEvent(mouseEvent);
  26.  
  27. }
  28.  
  29. void Scheme::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent){
  30.  
  31. 	QGraphicsScene::mouseReleaseEvent(mouseEvent);
  32. }
  33.  
  34.  
  35. void Scheme::dragEnterEvent(QGraphicsSceneDragDropEvent * event ){
  36.  
  37. 	QGraphicsScene::dragEnterEvent(event);
  38. }
  39.  
  40. void Scheme::dropEvent (QGraphicsSceneDragDropEvent * event ){
  41.  
  42. 	QGraphicsScene::dropEvent(event);
  43.  
  44. }
  45.  
  46. void Scheme::dragMoveEvent(QGraphicsSceneDragDropEvent *event){
  47.  
  48. 	qDebug("Drag move event");
  49. }
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MainWindow.h

Qt Code: 
  1. #ifndef MAINWINDOW_H_
  2. #define MAINWINDOW_H_
  3.  
  4.  
  5.  
  6. #include <QtGui>
  7.  
  8. class Scheme;
  9. class Viewer;
  10. class DragWidget;
  11.  
  12. class MainWindow : public QMainWindow {
  13.  
  14. 	Q_OBJECT
  15.  
  16. public:
  17. 	MainWindow();
  18. 	~MainWindow();
  19.  
  20. private:
  21.        QWidget *viewWidget;
  22.        QHBoxLayout *viewLayout;
  23. 	Scheme *scheme;		//list of all drawings that are participation in the scheme
  24. 	Viewer *view;		//view port
  25.  
  26. };
  27.  
  28. #endif /* MAINWINDOW_H_ */
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MainWindow.cpp

Qt Code: 
  1. #include <QtGui>
  2. #include <QLabel>
  3. #include <QPainterPath>
  4. #include <QGraphicsRectItem>
  5. #include <QHBoxLayout>
  6. #include <QRect>
  7. #include "MainWindow.h"
  8. #include "Scheme.h"
  9. #include "Viewer.h"
  10.  
  11. MainWindow::MainWindow() : QMainWindow() {
  12.  
  13. 	scheme = new Scheme(itemMenu);
  14. 	scheme->setMode(Scheme::MoveComponent);
  15. 	scheme->setSceneRect(QRectF(0, 0, 1000, 1000));
  16.  
  17. 	view = new Viewer(scheme);
  18. 	view->setRenderHint(QPainter::Antialiasing);
  19. 	view->centerOn(0,0);
  20.  
  21. 	viewLayout = new QHBoxLayout();
  22. 	viewLayout->addWidget(view);
  23.  
  24. 	viewWidget = new QWidget;
  25. 	viewWidget->setLayout(viewLayout);
  26.  
  27. 	setCentralWidget(viewWidget);
  28. }
  29.  
  30.  
  31. MainWindow::~MainWindow(){
  32.  
  33. }
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I removed some part of the code and I left just the constructors because I think this is the most important and I suppose that I should add something to the Viewer constructor in way that its scroll bars to become "adjustable"
If you have any ideas ....

Best regards,

Anton

PS:
this is the main():

Qt Code: 
  1. #include <QtGui>
  2. #include <QCoreApplication>
  3.  
  4. #include "MainWindow.h"
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QApplication a(argc, argv);
  9.  
  10.  
  11.     MainWindow mainWindow;
  12.  
  13.     mainWindow.setGeometry(0, 0, 1000, 1000);
  14.  
  15.     mainWindow.show();
  16.  
  17.     return a.exec();
  18. }
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