Unable to scroll

[Thany]

This bug existed at least already in 5.51, I was hoping for a fix in 6.0 but unfortunately not...

The problem is I'm unable to scroll using my mousewheel, but only in extremely large directories. One I'm unable to scroll in, contains approx. 80,000 files.

[WatchUer]

Yes, I can also reproduce this, I use the avi plugin, Ctrl + Pgdn a mpeg4 avi file(700MB), It contains more than 100,000 bmp files, then the mouse's wheel won't work. But a 200MB avi file contains more than 30,000 files without this question.

[Thany]

I guess there's some kind of 16-bit unsigned number limitation (which ranges from 0 to 65535)... However it must be possible to resolve this, since the windows explorer scrolls just fine, even with hundreds of thousands of files (ok, very slowly, but still ).

[white]

Are all the files shown?

I did some testing with a lot of 0 byte files. I created 32767 files of 0 bytes in a folder.

Scrolling using my mousewheel worked fine. However not all files were displayed in the file window of Total Commander. I don't remember exactly how many files were shown (I already cleaned up), I believe something like 32699. Maybe this has something to do with the sorting algorithm?

[Edited] I found a post-it on my desktop (my physical one ). Total Commander reported 32699 files. The rest of the files were not shown and no error message was given. [/Edited]

[Lefteous]

Some informations:

Number of items
On Win9x a listbox control cannot contain more than 32768 items. Total Commander uses such a listbox control.
On Windows NT based windows version there is no such limit.

Large directories work fine in Windows Explorer, but not in Total Commander. Why?
Windows explorer uses a listview control to display the items.

Scrolling problem
I wrote a small test program to verify this behavior. Indeed it doesn't work for listboxes containing more than 65536 items, even on a NT based machine.

[Thany]

That means the only remedy is that TC should manually catch the WM_MOUSEWHEEL message and process it. Even if a listbox contains more than 65536 items, the following line still works:

Code: Select all

SendMessage(ListBox.Handle, WM_VSCROLL, SB_LINEDOWN, 0);

So if this is done in the WM_MOUSEWHEEL message, and it's done according to the registry setting that defines how many lines to scroll at each mousewheel action, I don't see a problem

[Lefteous]

That means the only remedy is that TC should manually catch the WM_MOUSEWHEEL message and process it. Even if a listbox contains more than 65536 items, the following line still works:

Code: Select all

SendMessage(ListBox.Handle, WM_VSCROLL, SB_LINEDOWN, 0);

So if this is done in the WM_MOUSEWHEEL message, and it's done according to the registry setting that defines how many lines to scroll at each mousewheel action, I don't see a problem

Fine to hear that there is a solution. Is it right that WM_MOUSEWHEEL is driver dependant?

[SanskritFritz]

Use this very useful program as a workaround:
http://kickme.to/katmouse

[Lefteous]

2SanskritFritz

Katmouse doesn't work for me. Any idea?

[SanskritFritz]

2SanskritFritz

Katmouse doesn't work for me. Any idea?

If it doesnt work at all "KatMouse does not work together with Logitech Mouseware"

If the workaround is not working:
Katmouse / Settings / Applications / Add / Look for TOTALCMD.EXE / Open
Then double click on the TOTALCMD.EXE line / Custom scroll settings / Ok

This captures the WM_MOUSEWHEEL messages, and sends WM_SCROLL (or similar) messages to the scrollbar.

[Lefteous]

2SanskritFritz

Thank you.

[SanskritFritz]

2SanskritFritz

Thank you.

Yeah, KatMouse is a little gem.

[Thany]

Fine to hear that there is a solution. Is it right that WM_MOUSEWHEEL is driver dependant?

Well, you need to have a driver that generates this message when the scrollwheel is used. However, as of win98, all default drivers that come with the OS generate this message (if the mouse in question has in fact, a scrollwheel )

But nowadays there are pieces of cr*p like MouseWare that completely messes up the generation of WM_MOUSEWHEEL messages. Actually, I've never ever seen it work the way it should (I won't go into any detail as it would go beyond the scope of this topic). Not in any version of MouseWare. Microsoft's IntelliPoint works quite well I must say. And the only reason to install it anyway would be to effectely take advantage of additional button on the mouse...