[glade] Docs: update python catalog example

[Juan Pablo Ugarte <jpu src gnome org>]

commit b973d72ed9ca31471cda0147768b2487fee2672c
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Fri Jun 5 20:17:14 2020 -0300

    Docs: update python catalog example
    
    Update examples to show how to set properties defined in python
    at runtime.

 doc/gladepython.sgml | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)
---
diff --git a/doc/gladepython.sgml b/doc/gladepython.sgml
index 141f6a4e..d8b00a15 100644
--- a/doc/gladepython.sgml
+++ b/doc/gladepython.sgml
@@ -34,6 +34,7 @@ glade_python_init() will use this name to import your widgets into the
 interpreter.
 </listitem></varlistentry>
 
+pythonplugin.xml
      <programlisting>
 <![CDATA[
 <glade-catalog name="pythonplugin" library="gladepython"
@@ -41,11 +42,11 @@ domain="glade-3" depends="gtk+">
  <init-function>glade_python_init</init-function>
 
  <glade-widget-classes>
-   <glade-widget-class title="MyBox" name="MyBox" generic-name="mybox"/>
+   <glade-widget-class title="MyPythonBox" name="MyPythonBox" generic-name="mypythonbox"/>
  </glade-widget-classes>
 
  <glade-widget-group name="python" title="Python">
-   <glade-widget-class-ref name="MyBox"/>
+   <glade-widget-class-ref name="MyPythonBox"/>
  </glade-widget-group>
 </glade-catalog>]]>
      </programlisting>
@@ -66,13 +67,24 @@ do not forget that the name should be the one specified in your catalog name.
 pythonplugin.py
      <programlisting>
 <![CDATA[
-from gi.repository import Gtk
+from gi.repository import GLib, Gtk, GObject
 
-class MyBox(Gtk.HBox):
-       __gtype_name__ = 'MyBox'
+class MyPythonBox(Gtk.Box):
+  __gtype_name__ = 'MyPythonBox'
 
-       def __init__(self):
-               Gtk.HBox.__init__(self)
+  foo = GObject.Property(type=int, nick='An integer')
+  bar = GObject.Property(type=str, nick='A String')
+
+  def _update(self, obj, pspec):
+    self.label.set_text ('Python Properties\nInteger = ' + str(self.foo) + '\nString = \'' + self.bar + '\'')
+
+  def __init__ (self):
+    Gtk.Box.__init__ (self)
+    self.label = Gtk.Label (visible = True)
+    self.add (self.label)
+    self.connect('notify::foo', self._update)
+    self.connect('notify::bar', self._update)
+    self._update(None, None)
 ]]>
      </programlisting>
    </para>