[chimerax-users] mutitouch mac

[Oliver Clarke]

Any chance that this situation has changed with the release of Qt 5.10 Tom? I know it is in some sense a niche functionality but personally it is one of the major obstacles to my use of chimeraX - I find manipulation much more awkward than using a properly configured trackpad with legacy Chimera.

Cheers
Oli

> On Sep 15, 2017, at 4:50 PM, Tom Goddard <goddard at sonic.net> wrote:
> 
> Hi Edoardo,
> 
> We don’t have multitouch (2 and 3 finger drag) in ChimeraX currently.
> 
> A few years ago I used the Qt window toolkit to handle multitouch events. Qt 5.2(?) had multitouch disabled on Mac OS because it supposedly interfered with scrolling. I don't think I observed that scrolling problem. But I had to write some C++ code that called a native Mac OS method to get touch events, a pretty ugly hack to get it to work.
> 
> The current state in Qt 5.9 seems that multitouch events work with Qt widgets. But we need them to work on the graphics area which is a QWindow (for drawing OpenGL 3D graphics). The following Qt bug report (53874) from June 2016 indicates that getting multitouch events on Mac in a QWindow does not work despite the documentation saying it is supposed to work.
> 
> ​https://bugreports.qt.io/browse/QTBUG-53874 <https://bugreports.qt.io/browse/QTBUG-53874>
> A comment from the Qt developer Morten Sørvig assigned to this ticket indicates it still will require a C++ hack to get multitouch events. "Touch events need to be enabled on a per-QWindow basis on OS X. Widgets and Quick currently do this via the private function QCocoaNativeInterface::registerTouchWindow(). This means there is currently no way to get touch evens via QWindow::touchEvent() on OS X using public API only."
> 
> I think the same hack I used in the past can get by this problem. But I don't thick trackpad handling on Mac is important enough relative to other priorities to work on it right now.
> 
> Here is the ChimeraX ticket to monitor progress on this issue.  This URL is currently password protected but we are working to make the ChimeraX bug/feature database visible to the public.
> 
> 	https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/427 <https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/427>
> 
>   Tom
> 
> 
>> On Sep 15, 2017, at 3:39 AM, Edoardo Gianni <egianni at mrc-lmb.cam.ac.uk <mailto:egianni at mrc-lmb.cam.ac.uk>> wrote:
>> 
>> Hello,
>> 
>> I was wondering if multitouch was available on chimerax for mac, or if you had plans to implement it in the future.
>> 
>> Thanks and best wishes,
>> Edoardo
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