Re: Handling zooming (pinch) with mouse (multi-touch gestures) on OS X

[Ethan M. <merritt@u.washington.edu>]

On Sunday, 08 January 2012, Mojca Miklavec wrote:
> 4.) I would like to understand what part of gnuplot's source code is
> aware of mouse scrolling events (is receiving signals from operating
> system, so that GE_buttonrelease is set for example).

The terminals notifies the core mousing routines by filling in an
event structure and calling do_event() in mouse.c.    

For the qt terminal the sequence of calls is
thread 1:
m_eventHandler->postTermEvent( event_type, x, y, parameter1, parameter2, winid )

thread 2:
qt_waitforinput() 
-> qt_processTermEvent(gp_event_t* event) 
-> do_event()

The methods for specific event types are defined in QtGnuplotScene.cpp:
QtGnuplotScene::wheelEvent(QGraphicsSceneWheelEvent* event)
QtGnuplotScene::keyPressEvent(QKeyEvent* event)
QtGnuplotScene::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
and so on.

Does that answer the question?