piotrzurek.net

Every once in a while a day like yesterday happens and I feel like shooting someone in the knee to share my pain! I’ve spent the last few days trying to figure out how to get the DrawingArea scroll nicely inside a ScrolledWindow. With absolutely no luck of course. I realize that I’m lacking basic knowledge so I looked for some examples all over the web. It’s probably bread and butter for anyone with Gtk+/Gtk# experience, but apparently it doesn’t make it well documented. Seriously, Gtk# and “well documented” should not be used in the same sentence. If there is somebody (Novell?) who cares about adoption of Gtk# for cross-platform development, they should put some effort into making it all more approachable.
On the other hand – PyGTK examples were poping up everywhere. Maybe I started learing the wrong language…
Anyway, that’s what my problem looks like
…before scrolling:

… after scroling:

… and after re-exposing:

All suggestions highly appreciated…

So, the problem with slow drawing was indeed my fault. The calculation of every topic’s position was repeated through all previous topic on all higher levels. Now I calculate it just once for every topic and I can draw hundreds of topics in a blink of an eye. Another small step forward and I can already see a few more places for improvement.

So, it’s all coming together quite nicely, but the problem with the speed of drawing is killing me. I’m (almost) sure that it’s not a cairo related memory leak. I .Destroy() everything I can. It must be just something with my drawing procedures that iterate back and forth through the tree. Obviously I don’t do it in the most effective way. The problem is I don’t know many ways… I definetely need some help. Anyone, please!