how to sync zoom in two graphicviews with a single mouse wheelevent.

[vinay133]

i have a tab, in that tab, i added two frames(frame is separate class).this frame class calls the graphic view class(graphicview is also a seperate class). In the grapicsview class i am displaying images through graphicscene. this graphicsview consists of mouse wheelevent, when the mouse wheel is scrolled,the image gets zoomed in/out, my requirement is when i zoom one image both images should zoomed. please help me how to approach this, and provide your valuable suggestions or solutions. please help me.

[mrjj]

Hi and welcome
Many ways to do this, but here is my suggestion.

Add a signal to your graphicview class

signals:
    void MWheelActivated(bool ZoomIn);

and hook it up to a slot in your mainwindow with the connect function.
http://doc.qt.io/qt-5.5/signalsandslots.html

then in GraphicsView::wheelEvent(QWheelEvent *e)
you
emit MWheelActivated ( (e->delta() > 0));
and No zooming here!

Then in mainwindow slot

mainwindow:: MWheelActivated ( bool ZoomIn )
{
	if ( ZoomIn ) {
		view1->zoomIn ( 6 );
		view2->zoomIn ( 6 );
	} else {
		view1->zoomOut ( 6 );
		view2->zoomOut ( 6 );
	}
}

Hope it helps.