Log browser suggestions?

[jacek]

Isn't that like a tree structure?

It can display a tree, but it doesn't have to.

Or can it be used as a richtext text display widget as well?

You can subclass QListViewItem and make it display richtext using QSimpleRichText.

the most important part is really to be able to easily (in code) distinguish one line from another, and hide/show any given line quickly...

With QListView each line will be a different object, so you won't have problems with it.

I'm not sure how large log file QListView can handle, but since you have to create a lot of QListViewItems, it might not be enough.

The alternative is QTextEdit or QTextBrowser. QTextEdit even can operate in Log mode (in which it should be able to display more text than in other modes, but it also supports less formatting tags). Unfortunately it won't be easy to hide and show particular lines, but maybe you can have two representations --- one internal on which you can operate easily and one for the QTextEdit, that contains processed log visible to the user (of course it will increase memory usage).

Third solution is to create your own widget and if you want only to display logs, it might not be that hard.