changing appearance of the cursor in QwtPlotPicker?

[lazierbug]

Is it possible to change the appearance of the mouse cursor inside QwtPlotPicker from the large cross symbol to something else?

[Spitfire]

I don't think you can do it on the Picker, but you can on Canvas: QwtPlotCanvas::setCursor(Qt::ForbiddenCursor);
You can even specify your own custom cursor if you want.
http://doc.qt.nokia.com/stable/qcursor.html

[Uwe]

I don't think you can do it on the Picker, ...

Of course you can. There are a some basic options how to display the rubberband and if none of them fits you can overload drawRubberband.

Uwe

[lazierbug]

Hi Spitfire & Uwe,

Thanks for your replies.

@Uwe, how does one go about overloading the drawRubberBand? I've so far defined a customized Picker function with the following (i.e. if I wanted to change the "+" cursor into a rectangle)? The following doesn't compile, btw . I get errors for

error 1: invalid use of incomplete type ‘struct QPainter’
error 2: forward declaration of ‘struct QPainter’

class MyPicker: public QwtPlotPicker
{
    public:
    MyPicker():QwtPlotPicker() {};
 
    virtual void drawRubberBand(QPainter *p) const
        {
             QRect myNewCursor = QRect(0,0,10,10);
             p->drawRect(myNewCursor);  // error 1 here
        }
};
 
class MainWindow : public QMainWindow {   // error 2 here
 etc.
}

class MyPicker: public QwtPlotPicker
{
    public:
    MyPicker():QwtPlotPicker() {};

    virtual void drawRubberBand(QPainter *p) const
        {
             QRect myNewCursor = QRect(0,0,10,10);
             p->drawRect(myNewCursor);  // error 1 here
        }
};

class MainWindow : public QMainWindow {   // error 2 here
 etc.
}

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[Spitfire]

add

#include <QPainter>

#include <QPainter>

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[lazierbug]

Now it compiles! Thanks!

But this doesn't replace the little white "+"-symbol? Is this really part of the rubber band?

[Uwe]

No this is the cursor:

plot()->canvas()->setCursor( ... );

plot()->canvas()->setCursor( ... );

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See http://doc.trolltech.com/4.7/qwidget.html#cursor-prop

Uwe