has anyone gotten a subclassed item view model to work with a custom sort and filter?

[peterius]

to peterius: read the docs.
you can easily found a complete example of how do custom sort using model/view http://doc.trolltech.com/4.5/itemvie...ltermodel.html .

and if you really spend one year try to resolve this problem, leave the programming and work in something else. telemarketing maybe is a good option

This is more what I expect what from people. All I wanted was the vain hope that somebody on this forum has written a custom sort to replace Qt's item view sort. But instead I get the automatic "post some source code so we can ask inane questions" and then the flames from people like this.

Qt's custom sort filter model is garbage. Its way too slow to use and so I've subclassed it. I don't expect help from this forum because I don't think there's anyone who has actually subclassed the model and written a custom sort that works. I don't think Qt designed the item views well enough to actually do that. If anyone out there has tried this, then they would know what I've been trying to do with it for a year and would maybe have some idea how to work around the Qt internals to get a sort and filter on an item view without using QSortFilterProxy.

Edit:

Since the question is:

The answer is:
Yes.

Thank you. That's a start. So let's say you override the data() and index() functions and of course sort(). The problem for me is the filtering. Nothing I've tried seems to filter it correctly. The last thing I tried a few weeks ago was using setRowHidden on a subclass of the QTreeView. But this seems to randomly lose the filtering. Is this something your familiar with?

[tbscope]

Qt's custom sort filter model is garbage. Its way too slow to use and so I've subclassed it.

The first time I actually understand what your problem is. Was it so hard to say this?

I don't expect help from this forum because I don't think there's anyone who has actually subclassed the model and written a custom sort that works.

Your are very correct. This forum contains no users who write Qt code or do model/view programming. We are all stupid. (If you don't get sarcasm, this was it)

I don't think Qt designed the item views well enough to actually do that.

I agree that some parts of the Qt item views isn't like I want it to be.

If anyone out there has tried this, then they would know what I've been trying to do with it for a year and would maybe have some idea how to work around the Qt internals to get a sort and filter on an item view without using QSortFilterProxy.

How can anyone know what you mean if you don't say what you mean?
And yes, there's a way to sort your data without a proxy model: sort your data inside the model!

Thank you. That's a start. So let's say you override the data() and index() functions and of course sort(). The problem for me is the filtering. Nothing I've tried seems to filter it correctly. The last thing I tried a few weeks ago was using setRowHidden on a subclass of the QTreeView. But this seems to randomly lose the filtering. Is this something your familiar with?

Can you at least, I know it is hard to provide information, give a basic view of your data structure and how and what you want to sort?

Basically, your model contains the data structure. You can, when you add data for example, sort everything directly in the model. That would, as I think you suggest, make reading the data a lot faster because it doesn't need to be sorted when read. However, adding data can become slower of course. It also will break sorting in multiple views. Suppose you have a two listviews with the same model, you will not be able to sort them differently if you do it in the model directly, that's why proxy models are used.

[peterius]

Can you at least, I know it is hard to provide information, give a basic view of your data structure and how and what you want to sort?

Basically, your model contains the data structure. You can, when you add data for example, sort everything directly in the model. That would, as I think you suggest, make reading the data a lot faster because it doesn't need to be sorted when read. However, adding data can become slower of course. It also will break sorting in multiple views. Suppose you have a two listviews with the same model, you will not be able to sort them differently if you do it in the model directly, that's why proxy models are used.

Well like I said, the sort isn't the problem. Its that it loses the sorting when I try to filter it with setRowHidden. And I'm wondering if anyone has done this before? Your sarcasm aside, there's a good chance no one has. Do you know of a reason why setRowHidden would break it? Its as if the view doesn't use data() to access the model sometimes.

[yakin]

Its as if the view doesn't use data() to access the model sometimes.

No, you are right! Sometimes the view does some voodoo magic.
However, can we close this nasty thread now?

[tbscope]

Do you know of a reason why setRowHidden would break it?

I don't know, but going through the bug reports I found this bug:
http://bugreports.qt.nokia.com/browse/QTBUG-7537

Does this describe what you experience?
If so, try Qt-4.7.0, as this bug should be fixed in 4.7

[peterius]

I don't know, but going through the bug reports I found this bug:
http://bugreports.qt.nokia.com/browse/QTBUG-7537

Does this describe what you experience?
If so, try Qt-4.7.0, as this bug should be fixed in 4.7

It might be, but even if its fixed, QSortFilterProxy is too slow for me to use and the bug itself comes from the poor design of the model/view. Even if they fix it in the QSortFilterProxy, whatever is wrong with the underlying Qt stuff might still cause me problems if I don't use QSortFilterProxy. I like that that same assignee "Olivier Goffart" ignored my bug report and gave me crap about it which is partly why I'm so angry about all this, and yet there are bugs with it he didn't think to mention.

This project I work on was started in Qt 3 and I'm the only developer left so I think I'm going to just wait until I get a chance and move it away from Qt. This list view stuff is so incredibly simple and that they've screwed it up... thanks anyway. I didn't expect a solution but I was hoping someone else had even tried to get a fast sort working who could commiserate with me.

[tbscope]

Well, in the future, for any person you want to contact, be it in a bug report, a forum, etc... please, pretty please, do not start with:
"Hello, I am God, you suck, your code sucks, I don't expect you to know what I mean so I'm not going to say it. I'm not expecting you to help me, so I'm going to be very rude when you do".

The only person who comes out as an idiot, is you.

I'm sure your problem can be solved with the use of Qt. But you need to start listening to the people who want to help you. So I hope that you give this one more try:
Please provide information on how your data is structured and how you try to sort it via the proxy. I don't want you to tell me the model/view classes are poorly designed and I don't want you to tell me I suck (I know I do). Please, give the necessary information to actually help you.

[tbscope]

This blog might be interesting for you:
http://steveire.wordpress.com/

[hxcan]

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