Kmail: Folder Tree Flickering

[Scott Wheeler]

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On Monday 08 March 2004 20:48, Stefan Heimers wrote:
> 
> In Kmail, the folder tree on the left is flickering for some time after 
> you select "Check Mail". It seems like the whole tree is redrawn each 
> time one element is changed, even if that element is not visible at 
> that time.

First, this list isn't for reporting bugs, so I'm going to answer presuming 
you're willing to work on this...

> Is this a problem in the folder code in the libraries, or is Kmail using 
> it in the wrong way?

It's a problem with the triggerUpdate() method of QListView and it's overuse 
in the QListView implementation.

> Is there a way to tell qt not to update the display during the changes? 
> Or would it be possible/faster to copy the tree, set the copy 
> invisible, make the changes and then just swap the two trees?

It is possible to do a hack if it's really bad to reimplement the thing that's 
triggering the repaints and to specify only the regions of the widget that 
need to be repainted.  I did this a while back for the listview in Konq's 
file manager, I haven't noticed it being particularly bad in KMail.  If you 
want to get a feel for how this is done look at the diffs for:

http://lists.kde.org/?l=kde-cvs&m=106390691130000&w=2

- -Scott

- -- 
The world is full of magical things patiently waiting for our wits to grow 
sharper. 
- --Bertrand Russell
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