On 10/12/21 9:41 AM imacarthur wrote:
On Saturday, 9 October 2021
at 21:58:37 UTC+1 Albrecht Schlosser wrote:
Note that the two WM_MOUSEHWHEEL messages at the
beginning of the log are really that. However, I don't know
where exactly the other ewo interspersed WM_MOUSEHWHEEL
messages came from. I think that's a Windows "feature", some
gestures are sent as normal mousewheel events for backwards
compatibility (more tests required).
Yes, from the subsequent discussion, it does seem very
likely that the WM_MOUSEWHEEL events embedded in the GID_ZOOM
stream may well be there to support legacy applications.
And therefore... do we need to do something analogous in
our gesture event handling...?
Yes, I think so.
Windows gesture support in general is documented here:
The MS docs on "Legacy Support" can be found on the same page:
Interesting part: "The pan gesture maps to using the scroll wheel:
We don't handle these messages currently but I'm pretty sure I saw
(vertical) WM_MOUSEWHEEL and (horizontal) WM_MOUSEHWHEEL
messages originating from pan gestures. I'll check that out.
On macOS the system handles the pan gestures by sending
"mousewheel" events but, as Rob discovered and proposed in his
patch, you can distinguish pan gestures from real mousewheel events
and you *can* create different FLTK events. I think we need
to keep the "legacy" behavior (FL_MOUSEWHEEL) but we can maybe add a
flag so user programs know the origin (if necessary).
Another possibility would be to call an FLTK method that sets an
option how to deal with such messages. Old programs that don't call
this would get the "legacy" messages, new programs could opt in to
use the "new" (gesture) messages. Or something like that. However, I
wouldn't want to do that and I'm looking for a better way.
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