[Bug 19396] Blitzin2: Auto-vscroll not working

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=19396





--- Comment #1 from Dylan Smith <dylan.ah.smith at gmail.com>  2009-07-20 23:20:09 ---
Created an attachment (id=22492)
 --> (http://bugs.winehq.org/attachment.cgi?id=22492)
Let WM_VSCROLL message be sent to scroll richedit control

The WM_VSCROLL message is documented as a notification sent when a scrolling
event occurs, however, the application was using this to scroll the text in the
richedit control.  Apparently this works.

Previously this bug was not visible since ES_AUTOVSCROLL was always simulated
without checking for the style flag.  The application removes this style by
using EM_SETOPTIONS, so the automatic scrolling wasn't being performed anymore
after my recent patch.

The attached patch will fix the issue, but it isn't done right, so I am not
submitting it.

First of all WM_HSCROLL and EM_SCROLL probably have the same behaviour, but
this still needs to be tested to confirm.

Second of all WM_VSCROLL specifies the scroll position as a 16-bit value, so
overflow needs to be avoided for large amounts of text.  I did some testing,
and it seems as if nMax for the scrollbar is capped at 0xFFFF for native
richedit controls after a large amount of text has been loaded.  Normally nMax
corresponds to the height of the text in pixels, so I guess this is scaled
after the text gets to large.

-- 
Configure bugmail: http://bugs.winehq.org/userprefs.cgi?tab=email
Do not reply to this email, post in Bugzilla using the
above URL to reply.
------- You are receiving this mail because: -------
You are watching all bug changes.