Re: Which button is used on a drag?

[Paul Davis <pjdavis engineering uiowa edu>]

To clarify, Murray, isn't this part of the api reserved for 
drag-and-drop events. The original poster didn't really specify d-n-d 
behavior, and I'm mostly just curious for my own sake.  I've implemented 
a click-and-drag type of functionality to provide a graphics type of 
drawing.  Something I consider fundamentally different than d-n-d.

The only thing I'm really basing this on is the fact that signals like 
signal_drag_motion have docs that read to the effect of "on the drop 
site."  I've always assumed that *could* implement a drawing type of 
functionality with this part of the api, but I've also always assumed 
that I *shouldn't*, i.e., it'd be a kludge.

Relevant doc link:
http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1Widget.html#eaaa48aa4afa89087f43a19029bd43bd

Although this particular question pretty much boils down to did he mean 
drag-and-drop or the "i want a line to appear when i click a button and 
move the mouse" type of behavior. I'm mostly interested in the latter, 
but I'm always on the look out for better ways to solve a problem.

Thanks,
Paul

Murray Cumming wrote:

> > On Tue, 2006-08-08 at 08:15 -0500, Mark Tilford wrote:
> >    
> >
> > > I want to have different behaviors on right-drag and left-drag.  How
> > > do I find what button is being used for the drag?
> > >      
> > you have to handle button-press, motion and button-release events. in
> > the button-press event preceding the motion events, check ev->button for
> > the button that has been pressed.
> >    
>
> I'd hope that you can just handle the appropriate drag action:
> http://www.mcs.vuw.ac.nz/technical/software/doc/gtkmm-2.4/docs/reference/html/group__gdkmmEnums.html#g0a9506293be3b3dfe00ecdb83e764ca6
>
> I guess that theoretically the user could remap what action he means by
> left and right drag and you should allow him to do that. Also, it's
> probably easier than reimplementing the drag API.
>
> Or maybe it's just modifier keys that determine which drag action is
> meant. I'm not sure.
>
> Murray Cumming
> murrayc murrayc com
> www.murrayc.com
> www.openismus.com
>
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