[wxPython-users] Re: IEHtmlWindow GetScrollPos

[Robin Dunn]

David Montgomery wrote:
> Robin Dunn:
>> The scrollbars in the IEHtmlWindow don't belong to wxWidgets so it has 
>> no access to them.
> 
> Ken Seehart:
>> Is there any workaround for this? 
> 
> Robin Dunn:
>> Not that I know of, but perhaps you can get a low enough level of access 
>> using the win32com and win32api modules.  Or perhaps ctypes.  In other 
>> words if you can find the window handle of the IE window, or even the 
>> handles of the scrollbars, then you can call the raw win32 API functions 
>> using those handles and get what you need.
> 
> Robin, thanks for this suggestion.  Indeed, if you send the 
> appropriate win32 messages to the "Internet Explorer_Server" 
> window, you can scroll it.  I have a demonstration 
> implementation using win32gui sending (WM_VSCROLL, SB_BOTTOM).

Good news!

> 
> If I manually push a button that sends this, everything is fine.  
> 
> But if I send it automatically after the window is updated 
> using LoadString, it doesn't work.  It appears that the 
> window is doing some updating of its own after I send my 
> message, and this updating overrides or prevents the scrolling.
> 
> Waiting for the DocumentComplete event is definitely insufficient.  
> Posting an event back to myself from the DocumentComplete handler
> still gets the undesired behavior.
> 
> What is working is to do a CallLater to do the scroll, with 
> a 1/10th second delay after DocumentComplete fires.
> 
> But this seems quite bogus.  It seems there should be some
> event that I can wait for, such that when it occurs, the 
> IEHtmlWindow is *really* complete with its processing, and
> now sending the win32 scrolling message will work, just like
> it would if I waited 1/2 a second.
> 
> Any suggestions on what event this would be for an IEHtmlWindow 
> updated via LoadString?

No idea, sorry.  Based on your experiences with this you now officially 
know more about it than I do.  ;-)


-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!