QNativeGestureEvent Mac OSX TrackPad finger Capture Operation zoom Solved. :-)



  • At top from my QWidget QAbstractScrollArea i put grabGesture ...

    this->grabGesture(Qt::SwipeGesture,Qt::DontStartGestureOnChildren);
    this->grabMouse();
    this->setContentsMargins(0,0,0,0);
    this->setAcceptDrops(true);
    

    after from main event( QEvent * e) i ast all QNativeGestureEvent
    #include <QInputEvent>
    #include <QNativeGestureEvent>

    & QNativeGestureEvent give value() of the swiped distance and more info about pos on screen
    From the inomming event that i see .. its possibel to rotate paint QWidget...

    ///  mac  trackpad https://support.apple.com/en-us/HT204895
    bool DrawDoument::gestureNative( QNativeGestureEvent * e ) {
       QTextStream  xcout(stdout, QIODevice::WriteOnly);
       QString dir;
         if ( e->value() < 0) {
             distanceswip = distanceswip - e->value();
             setZoom( scaleFaktor - TRACKPADSTEEPS );  /// SCALING_STEEP = 0.075555555
            dir = "zoom in";
          } else {
             distanceswip = distanceswip + e->value();
             setZoom( scaleFaktor + TRACKPADSTEEPS );
             dir = "zoom out";
           }
      xcout << "-----------------swip (" << e->value()  << ")" <<  dir << "x" << POINT_TO_MM(distanceswip) <<"\r";
      e->accept();
      return true;
    }
    bool DrawDoument::event( QEvent * e) {
      if ( e->type() == QEvent::NativeGesture ) {
         return gestureNative(static_cast<QNativeGestureEvent*>(e));
      }
      strak = strak + 0.11; /// visual sleep?
      const int xmac = e->type();
      QTextStream  xcout(stdout, QIODevice::WriteOnly);
      xcout << "E," <<strak << ":->" <<  __FUNCTION__ << " - " << xmac <<"\r";
      return QAbstractScrollArea::event(e);
    }
    

  • Lifetime Qt Champion

    Thanks for sharing your findings !



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