[bt-devel] Problem with Mag Window and Scrolling

[Gary Holmlund]

I have not yet found the specific problem, but I have some more 
understanding of what Qt versions it happens with. Qt is no longer a 
single version number. The qt webkit now ships separately. You can have 
a system with Qt 4.7.4 and the original webkit that went with it, or you 
can have Qt 4.7.4 without webkit and add the qt webkit 2.2. Fedora 15 
has the webkit from 4.7.4 and the others have the 2.2 webkit. In other 
words the problem occurs with distributions that have Qt webkit 2.2.

Now that I understand this, I can get the source for Qt webkit 2.2 and 
debug further into this issue.

Gary

On 10/23/2011 08:53 PM, Gary Holmlund wrote:
>
> After trying BibleTime on ubuntu 11.10, I see that we have a serious 
> bug. The Mag Window is not working. To be more specific, it will work 
> if you open a new Bible window and try it. But, if you change to 
> another verse so that the window text is reloaded, the Mag window 
> quits. If you try a window that was automatically opened by the saved 
> session, it will not work.
>
> I have been using Fedora 15 and it works fine with the latest source. 
> But in trying ubuntu 11.10 (both 32 bit and 64 bit) and Fedora 16 
> beta2, they don't work.
>
> Fedora 15 - Qt 4.7.4
> Ubuntu 11.10 - Qt 4.7.4
> Fedora 16 - Qt 4.8.0
>
> I have used the same Bt source for all tests and the F15 and u 11.10 
> have the same Qt. I don't know why it works on F15 and not on the others.
>
> The Bt 2.8.1 that comes with ubuntu 11.10 also does not work, so it is 
> not because of a recent change.
>
> I though perhaps the html loaded the first time into the window was 
> different that the second time. I have been able to rule this out.
>
> I have been debugging this problem. We use BtHtmlJsObject to call from 
> c++ to javascript and for javascript to call c++. I have determined 
> that when the problem occurs, it is because we try to call javascript 
> from c++ and the call does not get to the javascript.
>
> The specific c++ to javascript call that fails is in 
> BtHtmlJsObject::mouseMoveEvent where you see "emit startTimer". All 
> c++ to javascript calls fail. The BtHtmlJsObject::moveToAnchor 
> function fails. This causes the Bible text in the window to not scroll 
> as you change verses.
>
> The BtHtmlJsObject is attached to the javascript by the 
> BtHtmlReadDisplay::loadJSObject function. It is being called each the 
> the text of the window is reloaded, so this is not the problem.
>
> My current conclusion is that the problem is somewhere inside of Qt. I 
> am compiling a version of Qt so that I can debug into the Qt 
> functions. I will keep you posted.
>
> Anyone have any other thoughts?
>
> Gary
>
>