Re: [TCLCORE] TIP 474: "Treat the mouse wheel events in a uniform way" again

[Harald O. <har...@el...>]

Am 29.06.2018 um 16:25 schrieb Brad Lanam:
> Ok, WM_[VH]SCROLL are different messages.
> 
> Tk/Windows needs a handler for the WM_MOUSEHWHEEL message.
> 
> https://docs.microsoft.com/en-us/windows/desktop/inputdev/wm-mousehwheel
> <https://docs.microsoft.com/en-us/windows/desktop/inputdev/wm-mousehwheel>

Hi Brad,

have you seen my comment on the Tk ticket:

https://core.tcl.tk/tk/info/ab046f476f75fc21

I have read and verified with notepad, that the default windows message
handler DefWindowProc will magically create a WM_HSCROLL, if
- a WM_MOUSEACTIVATE is received (this was observed, not read)
- the target window has a scrollbar

If I type enough characters into the notepad entry widget to get a
horizontal scrollbar, the WM_HSCROLL was sent. IMHO this is a legacy
emulation. This is probably not helpful for Tk. We should find out what
is really happenning. The WM_MOUSEACTIVATE si always sent.

IMHO, the handler for WM_MOUSEWHEEL is included in Tk.

I did not observe the message WM_GESTURE at all (which should IMHO be
the right message for this but o.k.).

Thank you,
Harald