[Kmymoney-devel] Some planning for the next release

Cristian Oneţ onet.cristian at gmail.com
Sat Feb 6 09:13:09 CET 2010

În data de Vineri 05 Februarie 2010 14:41:32 Alvaro Soliverez a scris:
> Cristian has an idea about how to handle models, which could
> improve performance and improve the tidiness of the code. He can tell
> you more about that, since part of that might be done during the next
> release.
Let me tell you about this. As you know I started working on a model for 
accounts. For now this model is used in the account selector widget in the 
ledger (through a filtering proxy model). It's reloaded in the same place where 
the old widget's data was reloaded. 
Than I've went on to see what extra data would this model need to store so it 
would be usable in the other account views we have in the application. After 
adding functionality to it I got to the stage where the same model can be used 
in the accounts view and the account selector widget (with the appropriate 
When reaching this point I came to the conclusion that we really need only one 
instance of the model object per application that would be keep up to date 
with the MyMoneyFile object. It would avoid executing the same loading 
procedure all around the application.
To accomplish this I was thinking of making a singleton that would be the 
owner of all these 'core' models (with all the data related to that model) of 
the application. This would take care of loading the models and keeping them 
in sync with the data from the MyMoneyFile.
When we would need a new view of a model somewhere in the application we would 
write a filtering proxy model that would leave us only with the data we need to 
display and maybe a custom view if needed. Like the one I have to write for 
the accounts tree to be able to display the total balance of an account like 
it's done now (when the item is expanded the total balance is the actual 
balance of the account when it's collapsed it's the balance of the account and 
the sum of the balances of the sub-accounts) and also to handle the context 

Any thoughts?


Cristian Oneţ
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