How do I insert a dynamically created widget into a Gtk.Builder / Gtk.Template -created tree of widgets?

Platform
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1

I’m basically trying to use the .ui file and logic, based off of the GNOME Builder’s boilerplate code, but to inject an arbitrary widget after the others have been created:

 @Gtk.Template(resource_path='/net/videotune/tuner/window.ui')
 class VideotuneWindow(Adw.ApplicationWindow):

     def __init__(self, **kwargs):
         super().__init__(**kwargs)

[...]

        box = Gtk.Template.Child("video_container")
        box.append(gtksink.props.widget)

[...]
        <child>
          <object class="GtkBox" id="video_container">
            <property name="orientation">vertical</property>
          </object>
        </child>
[...]

But this is the result:

Traceback (most recent call last):
  File "/app/share/videotune/videotune/main.py", line 48, in do_activate
    win = VideotuneWindow(application=self)
  File "/app/share/videotune/videotune/window.py", line 40, in __init__
    box.append(gtksink.props.widget)
AttributeError: 'Child' object has no attribute 'append'

Does anyone know how to extract a reference to the Gtk.Box object?

While I have a general sense about Python decorators, the Python gi doc doesn’t have a section for Gtk.Template, so I wonder if it would be more straight-forward, and a bit less magical, if I explicitly used Gtk.Builder rather than Gtk.Template?

2

Here are the python docs for Gtk.Template: Gtk.Template — PyGObject.

You must define them as class attributes.

3

Thanks for the help. : ) The following worked for me, with or without the parameter to Gtk.Template.Child:

@Gtk.Template(resource_path='/net/videotune/tuner/window.ui')
 class VideotuneWindow(Adw.ApplicationWindow):
     __gtype_name__ = 'VideotuneWindow'
 
    video_container = Gtk.Template.Child("video_container")

    [...]

In case anyone is wondering, I previously tried building the widget tree using Gtk.Builder, but ran into the following issue:

(python3:2): Gtk-ERROR **: 08:38:27.805: failed to add UI from resource /net/videotune/tuner/window.ui: .:2:147 Template declaration (class 'VideotuneWindow', parent 'AdwApplicationWindow') where templates aren't supported
4

In case anyone is wondering, I previously tried building the widget tree using Gtk.Builder, but ran into the following issue:

When you are using Gtk.Builder you shouldn’t use <template> but a regular <object>.

5

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