Re: Selections in TreeViewS and efficiency issues

[Matthias Kaeppler <nospam digitalraid com>]

Matthias Kaeppler wrote:
> 1.  How can I avoid this seemingly inefficient behavior? How can I keep 
> it from reiterating over all rows again, if I add more items to the 
> selection?

Looks like I'm the only one who's bothered by this.
Okay, look again:

Consider a TreeView with 1000 entries.  Now select the first entry, hold 
shift and press the down-key to expand the selection downwards till you 
reach the bottom.
After hitting 'down' for the n-th time, the signal handler has been 
called (n * (n+1)) / 2 times (1 + 2 + 3 + ... + n).  That means, after 
selecting 1000 entries this way, the signal handler has been called 
(1000 * 1001)/2 times, that is 500500 times.  In words: Over half a 
/million/ times!

I really hope I am missing something.


--
Matthias Kaeppler