CODEWITHSUNDEEP
pythonpython-3.xgtk3pygtkpygobject
Bachsau
Bachsau

Reputation: 1325

How to customize text rendered in a `Gtk.TreeViewColumn`?

I have the file size in bytes stored in a Gtk.ListStore and want them to be rendered in a human-readable format by a Gtk.CellRendererText. Reading the documentation, it seems like Gtk.TreeViewColumn.set_cell_data_func() is the way to achieve this. Setting it up works without errors, but as soon as a cell is to be rendered, the whole application crashes after several failed assertions.

This is the code I'm using:

self._builder.get_object("ContentList.Size").set_cell_data_func(
    Gtk.CellRendererText(),
    self.render_formatted_size
)

And this is what's printed to stderr:

/usr/lib/python3.7/site-packages/gi/overrides/Gio.py:44: Warning: g_object_freeze_notify: assertion 'G_IS_OBJECT (object)' failed
  return Gio.Application.run(self, *args, **kwargs)
/usr/lib/python3.7/site-packages/gi/overrides/Gio.py:44: Warning: g_object_get: assertion 'G_IS_OBJECT (object)' failed
  return Gio.Application.run(self, *args, **kwargs)
/usr/lib/python3.7/site-packages/gi/overrides/Gio.py:44: Warning: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  return Gio.Application.run(self, *args, **kwargs)
/usr/lib/python3.7/site-packages/gi/overrides/Gio.py:44: Warning: g_object_is_floating: assertion 'G_IS_OBJECT (object)' failed
  return Gio.Application.run(self, *args, **kwargs)
/usr/lib/python3.7/site-packages/gi/overrides/Gio.py:44: Warning: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
  return Gio.Application.run(self, *args, **kwargs)

Content of self.render_formatted_size should not matter here. It seems like it's never executed.

PS: Adding additional string columns to the model is not an option, as I want to be able to change display units (SI, IEC) at any time.

Upvotes: 0

Views: 284

Answers (1)

Alexander Dmitriev
Alexander Dmitriev

Reputation: 2525

You pass a newly created CellRenderer, not an existing one. Something like this should be done instead:

rend = Gtk.CellRendererText()
column = Gtk.TreeViewColumn("title", rend)
column.set_cell_data_func (rend, cell_fn, None);
tree.append_column(column)

Upvotes: 1

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