Drag and Drop with GObject introspection

[Mathias Brodala <info noctus net>]

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Hi.

We recently did some experiments with porting PyGtk code to PyGi and
stumbled over the Drag and Drop handling. In PyGtk nothing more than the
following is required to allow a tree view to handle file drops:

> view = gtk.TreeView()
>
> view.drag_dest_set(
>     gtk.DEST_DEFAULT_ALL,
>     [('text/uri-list', 0, 0)],
>     gtk.gdk.ACTION_COPY | gtk.gdk.ACTION_MOVE
> )

With PyGi the equivalent function seems to be Gtk.drag_dest_set() which
yields the following attempt:

> view = Gtk.TreeView()
> target = Gtk.TargetEntry()
> target.target = 'text/uri-list'
> target.flags = 0
> target.info = 0
> 
> Gtk.drag_dest_set(
>     view,
>     Gtk.DestDefaults.ALL,
>     target,
>     1,
>     Gdk.DragAction.COPY | Gdk.DragAction.MOVE
> )

However, the assignment of the target to the respective struct member
yields the following error:

> RuntimeError: unable to set value for field

Why does the assignment to "target" fail whereas "flags" and "info" are
fine?

The GTK docs describe the "targets" parameter of Gtk.drag_dest_set() as
follows:

> a pointer to an array of GtkTargetEntrys indicating the drop types that
> this widget will accept, or NULL.

However, there obviously are no pointers in Python. So how would one
specify multiple targets here? Specify None upon Gtk.drag_dest_set() and
separately modify the target list via Gtk.drag_dest_set_target_list()?
This however also fails right at the Gtk.drag_dest_set() call with None
as target and 0 as target count:

> TypeError: argument 2: Must be Gtk.TargetEntry, not NoneType

Simply specifying a list of targets also fails, no matter the content:

> TypeError: argument 2: Must be Gtk.TargetEntry, not list

Should I just file a bug report about Drag and Drop handling in PyGi in
general?


Regards, Mathias
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