How can trap the double click on the wheel of a wheel mouse?

[davidgraham]

I'm using a wheel mouse in my graphics application.

I can scroll the wheel mouse to zoom in and out and if I hold the wheel mouse down I can pan. This is the same funcionality as AutoCAD.

I now want to be able to double click the wheel mouse to do an zoom extents. How do I detect that the user has double clicked the wheel mouse?


Below is a sample of code I'm using:

case (WM_MOUSEWHEEL)
i2=HIWORD(wParam)
if (i2>0) then ! zoom in
! get new screen extents
else ! zoom out
! get new screen extents
end if
! display graphics

case (WM_MBUTTONDOWN) ! middle button down store postion
mButtonDown=.TRUE.
mButtonE=LOWORD(lParam) ! store cursor position in client view
mButtonN=HIWORD(lParam)

case (WM_MBUTTONUP) ! middle button up
mButtonDown=.FALSE.


Thanks

[IanH]

Handle the WM_MBUTTONDBLCLK (msdn link) message.

[Steven_L_Intel1]

If you're using QuickWin, we had a bug in the library which prevented double-click from being recognized. That was fixed in Update 6.

[davidgraham]

Thanks,
I've tried WM_MBUTTONDBLCLK and it's bot being recognised, I am recognising WM_MBUTTONDOWN - a sample of my code is shown below.

case (WM_MBUTTONDOWN) ! middle button down store postion
call MsgBox ('Middle mouse button down'c,"E")
MainWndProc = 0
end if
return

case (WM_MBUTTONDBLCLK)
call MsgBox ('Middle mouse button double click'c,"E")
MainWndProc = 0
return

It is a Windows application, not a QuickWin application but the double-click is not being recognised.
How can I tell which version I'm running - the 'help about' just gives the version of Visual Studio.

[Steven_L_Intel1]

It is shown in the build log, or you can look at the detailed list of "Additional Products" in Help. But if you're not using QuickWin, then the bug I referred to does not apply to you.

[davidgraham]

Thanks,

The build log says:
Compiling with Intel Visual Fortran Compiler XE 12.0.4.196 [IA-32]...

Do you have any suggestions why double clicking on the middle button on the mouse is not being recognised?
WM_MBUTTONDOWN and WM_MBUTTONUP are being recognised.

I've checked what message I'm getting - 519 & 520 for WM_MBUTTONDOWN & WM_MBUTTONUP which is Hex 207 & 208.

If I double click I just get a WM_MBUTTONDOWN followed by a WM_MBUTTONUP.

Maybe I will have to check on a 'Down' followed by an 'Up' over a 'short' time.

[Steven_L_Intel1]

MSDN sez:

Only windows that have the CS_DBLCLKS style can receive WM_MBUTTONDBLCLK messages, which the system generates when the user presses, releases, and again presses the middle mouse button within the system's double-click time limit. Double-clicking the middle mouse button actually generates four messages: WM_MBUTTONDOWN, WM_MBUTTONUP, WM_MBUTTONDBLCLK, and WM_MBUTTONUP again.

Does your window have the CS_DBLCLKS style?

[davidgraham]

Steve,
Thanks, I hadn't read right to the bottom of the documentation.
I'm now getting the double clicks.