Hello everybody. I was looking at Cocoa framework and QtCreator's code and i was interested in document-based application architecture. I think that we can add something like QDocument (QAbstractDocument) class with following features - isModified, isReadOnly, open/save from/to QIODevice/QUrl, undo/redo, etc... This class should be the base class for other documents in document-based apps. For example, we can inherit QTextDocument from QDocument. Over QDocument, we can implement QDocumentWindow - a class, inherited from MainWidnow that provides standard slots/actions for manipulating with files in applications - open/save/close, etc. Note, that no widgets are used here (except for window), just only document, so you can build any UI on top of that window - all you need is call "QDocumentWindow::setDocument" when document is changed (for example, tab is switched). I would like to hear pros and cons about that idea (not new one, hehe) Unfirtunately, as long, as Qt5 is frozen and we can't add QDocument. But we can add an empty QDocument class (QTextDocument->QDocument->QObject) and add new functionality to it in Qt5.1/5.2 As far as i know, adding new virtual functions to the end of vtable doesn't break BC. Am i right? If it is not possible, maybe we can add pointer in a QTextDocument, containing pointer to QDocument.
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