Creating a new album from a custom InputDialog

The AlbumListPage needs some data to display. The next step is to be able to add a new album. To do this, at some point we will have to call an AlbumModel function from QML to add this new album. Before building the UI, we have to make a small modification in gallery-core.

The AlbumModel function is already available in QML. However, we cannot directly call AlbumModel::addAlbum(const Album& album) from the QML code; the QML engine will not recognize the function and will throw an error TypeError: Property 'addAlbum' of object AlbumModel(...) is not a function. This can be fixed by simply decorating the desired function with the Q_INVOKABLE macro (as we did for PictureModel::setAlbumId()).

Nonetheless, there is another issue here: Album is a C++ class which is not recognized in QML. If we wanted to have full access to Album in QML, it would involve important modifications to the class:

• Force Album class to inherit from the QObject class.

• Add...