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

[Mojca M. <moj...@gm...>]

On Mon, Jan 9, 2012 at 00:33, Ethan Merritt wrote:
> 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?

Yes, thank you. That piece of information makes it perfectly clear.
Now I see that in order to add extra event, I need a new class,
QtGnuplotGesture (in addition to QtGnuplotScene) for example. I might
need more information later, but for now this is enough to start
experimenting.

Mojca