Ignoring keyboard events in QwtPlotPicker

[frankiefrank]

Sorry if this question was already asked, I couldn't find it searching.

I have the following plot picker initialized for my QwtPlot:

mPicker = new QwtPlotPicker(QwtPlot::xBottom, QwtPlot::yLeft, 
QwtPlotPicker::CrossRubberBand, QwtPlotPicker::AlwaysOff, canvas());
mPicker->setStateMachine(new QwtPickerClickPointMachine());

mPicker = new QwtPlotPicker(QwtPlot::xBottom, QwtPlot::yLeft, 
QwtPlotPicker::CrossRubberBand, QwtPlotPicker::AlwaysOff, canvas());
mPicker->setStateMachine(new QwtPickerClickPointMachine());

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I see that the default behavior is that the keyboard events (mainly the direction keys) are handled by the plot picker to move around the cross. How can I ignore these events so that they are not caught by the plot / picker?

[Uwe]

QwtPicker is derived from QwtEventPattern, where all mouse and keyboard assignments are defined, that the picker handles.

Uwe

[frankiefrank]

Thanks for your reply Uwe. I see the inheritance and I see some samples that define mouse keys. But what I still can't understand is how to set my object to ignore the up and down keys.

I'm looking at the documentation at http://qwt.sourceforge.net/class_qwt_event_pattern.html but I don't see the right way to go.

[Uwe]

Simply change the key code, that is connected to the KeyUp/KeyDown events. 0 would disable the functionality completely ( as it is no valid key code ).

mPicker->setKeyPattern( QwtEventPattern::KeyUp, ... );
mPicker->setKeyPattern( QwtEventPattern::KeyDown, ... );

mPicker->setKeyPattern( QwtEventPattern::KeyUp, ... );
mPicker->setKeyPattern( QwtEventPattern::KeyDown, ... );

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Check QKeyEvent for the meaning of the key/button combinations you could use to redefine your picker.

Uwe

[frankiefrank]

Thank you! That was exactly what I was looking for.