FilterProxy model

[wysota]

If you reimplement filterAcceptRows you can do any filtering you want. You get an index of the model, you do whatever you want with it and then return true or false to make the index visible or not. For example once I made a filter that filtered rows based on results of some heavy calculations performed on the whole model. The threshold value was set by a slider that was connected to the proxy model so whenever the slider value changed, the filter was recalculated.

[gyre]

thanks guys...Ill try to implement it as you advised me...
just one last question...
Is there such thing(method) that would allow me to disable/enable filtering upon some event ? like when the state of checkbox changes ...

I thought I understood invalidateFilter() method but it seems I dont...what does it do ?
Thanks

[Khal Drogo]

Since you are using a custom proxy model, you probably dont use the setFilterRegExp, setFilterFixedString, etc. methods, to pass a single string as filtering criterion.
The above functions (if i understood correctly) do call invalidateFilter themselves, when they are called.
So you have to use invalidateFilter yourself after setting the new filtering criterias; you are basically forcing the model to consider your updated criterias instead the old ones.

You can enable/disable using the filter, if thats what you meant by that, by for instance setting a flag in your model, when the checkbox is checked, then in filterAcceptsRow if this flag is checked, you use the filter, if not, you just return true, thus every row is accepted.
Don't forget calling invalidateFilter after you set the flag.

Hope it helps.

[gyre]

I dont know...I tried to implement the model as show in example but it somehow doesnt work...Can anyone tell me why not ? ...
I attached the header and source files Im using...
Thanks

[gyre]

I changed the files to ones that are in attachements...
Filtering now works OK...but when I remove all characters from lineedit from which I control filtering the model does not get to the original state and ALL items are filtered...dont know why

[gyre]

I have found a problem...it has to be checked whether the regexps are empty...
see the attached code if youre interested...