Hello. I'm developing program with QwtPlot and subclass of QwtPlotZoomer. I decided to add keyboard zooming ability alongside with mouse, but it didn't work while mouse zooming worked perfectly
Qt Code: 
  1. zoom->setMousePattern( QwtEventPattern::MouseSelect1, Qt::LeftButton);	// zoom selection
  2. 	zoom->setMousePattern( QwtEventPattern::MouseSelect2, Qt::LeftButton, Qt::ControlModifier );	// zoom out to full size
  3. 	zoom->setMousePattern( QwtEventPattern::MouseSelect3, Qt::LeftButton, Qt::AltModifier );	// zoom out to previous size
  4. 	zoom->setMousePattern( QwtEventPattern::MouseSelect6, Qt::LeftButton, Qt::ControlModifier | Qt::AltModifier );	// zoom in to nex size
  5. 	zoom->setKeyPattern( QwtEventPattern::KeyRedo, Qt::Key_I, Qt::ShiftModifier );
  6. 	zoom->setKeyPattern( QwtEventPattern::KeyUndo, Qt::Key_O, Qt::ShiftModifier );
  7. 	zoom->setKeyPattern( QwtEventPattern::KeyHome, Qt::Key_Home );
  8. 	//zoom->setObjectName(QStringLiteral("%1").arg(listCurrTabGraphs.count() + 1));
  9. 	zoom->setZoomBase(true);
  10. 	zoom->setEnabled(false);
  11. 	zoom->setEnabled(true);
  12. 	zoom->canvas()->installEventFilter(this);
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I installed eventFilter and saw that KeyPress events not rising

I created test application with this 2 widgets only and it worked. I have no idea how to handle this error.