[Qt-creator] Way to make some custome operations before file save in subclasses of TextEditor::BaseTextEditor

[eike.ziller at nokia.com]

On Nov 3, 2010, at 10:41 PM, ext Denis Kormalev wrote:

> Hello all,
> I'm developing plugin to show xml as tree (you can look at it here: http://gitorious.org/qt-creator-xml-tree-plugin). For now I've stopped at design where I have two tabs: one for tree and another for xml source. I'm showing xml source in PlainTextEditor subclass and so I use BaseTextEditable subclass too instead of custom Core::IEditor subclassing. I need to perform some work before saving. For example, I need to update PlainTextEditor contents before saving if I'm in tree tab (I'm updating contents of tabs only at tab switching for better performance), but I can't find way to put my code after ctrl-s was clicked and before data was pushed to file. 
> I think that someone who will need to write some editor based on PlainTextEditor will want such functionality too. For example if he wants to add some data to file or maybe clean it from unneeded spaces or somewhat else.
> What are you thinking about adding virtual method named like beforeSave() to BaseTextEditor?

Subclass BaseTextDocument and reimplement the "save" method (do your stuff, then call BaseTextDocument::save).
Set an instance of your BaseTextDocument subclass as the text document via BaseTextEditor::setBaseTextDocument. Have a look how that is used in other BaseTextEditor subclasses in Qt Creator.

Br, Eike