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Jo-Erlend Schinstad
Asked: 2011-10-25 05:55:59 +0800 CST

Porting "import gobject" to use GObject-Introspection. (PyGTK to PyGI and GTK 3)

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I've been trying to port a library from PyGTK to use GI and GTK3. The problem is I can't find any resources specific to the gobject imports, but only for GTK. I was hoping that if someone would translate the following for me, I would get a grasp of how to do this stuff. The GTK things itself seems to be fairly well documented, but I can't find anything about this. 


__gsignals__ = {'cell-edited' : (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
    (gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT, 
    gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT)), 'selection-changed' : 
    (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (gobject.TYPE_PYOBJECT,))}

My assumption was, since I couldn't find any specific documentation, that it would be a matter of changing the name of the constants, but I can't find any replacements.

python

2 Answers

  1. Best Answer

    Think I've cracked the code after dir()-ing everything I could find in the GObject class =>

    G_SIGNAL_RUN_FIRST is found in the GSignalFlags enum, which translates to GObject.SignalFlags.RUN_FIRST. This is consistent, so G_SIGNAL_MATCH_ID found in the enum GSignalMatchType translates to GObject.SignalMatchType.ID.

    Not entirely obvious, but easy enough once you know what to look for.

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  2. As per previous comments, the translation you asked would be as follows:

    from gi.repository import GObject

__gsignals__ = {'cell-edited': (GObject.SignalFlags.RUN_LAST,
                                GObject.TYPE_NONE,
                                (GObject.TYPE_PYOBJECT, GObject.TYPE_PYOBJECT, GObject.TYPE_PYOBJECT, GObject.TYPE_PYOBJECT, GObject.TYPE_PYOBJECT)),
                'selection-changed': (GObject.SignalFlags.RUN_LAST, GObject.TYPE_NONE, (GObject.TYPE_PYOBJECT,))}

    However, according to my own experience, some python types are somehow internally mapped to their GObject counterparts (or at least, it works as if they were), that is, object is mapped to GObject.TYPE_PYOBJECT and None to GObject.TYPE_NONE. Hence, I find the following version more straightforward:

    from gi.repository import GObject

__gsignals__ = {'cell-edited': (GObject.SignalFlags.RUN_LAST,
                                None, (object, object, object, object, object)),
                'selection-changed': (GObject.SignalFlags.RUN_LAST, None, (object,))}
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