Expansion rules for a blank widget

[grabalon]

Nice work so far. The graphicsEditorWidget is good to keep for ui interface purposes. You can use it to connect mouse and keyboard events to appropriate slots within both your View and Scene. To sub-class you'll need an entirely new class (I'll call it MyGraphicsView for lack of a better name). Declare it as follows:

class MyGraphicsView : public QGraphicsView
{
  Q_OBJECT
public:
  MyGraphicsView(QGraphicsScene*, QWidget* parent = 0);
protected slots: //Use this if you want the zoom features
  void wheelEvent(QWheelEvent* event);
}

class MyGraphicsView : public QGraphicsView
{
  Q_OBJECT
public:
  MyGraphicsView(QGraphicsScene*, QWidget* parent = 0);
protected slots: //Use this if you want the zoom features
  void wheelEvent(QWheelEvent* event);
}

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The constructor is fairly straightforward:

MyGraphicsView::MyGraphicsView(QGraphicsScene* s, QWidget* parent) : QGraphicsView(s, parent) { }

MyGraphicsView::MyGraphicsView(QGraphicsScene* s, QWidget* parent) : QGraphicsView(s, parent) { }

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I'll let you fill in other class features as you see fit, but I suggest the wheel event function looks something like:

void MyGraphicsView::wheelEvent(QWheelEvent *event)
{
    if(event->delta() > 0)
        scale(1.1111,1.1111);
    else
        scale(0.9,0.9);
}

void MyGraphicsView::wheelEvent(QWheelEvent *event)
{
    if(event->delta() > 0)
        scale(1.1111,1.1111);
    else
        scale(0.9,0.9);
}

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Finally, to actually use the View, change line 11 in your code above to:

MyGraphicsView* graphView = new MyGraphicsView(graphScene);

MyGraphicsView* graphView = new MyGraphicsView(graphScene);

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See if that get's you going on how this all works.