about dialog: migrate from Gtk.Builder to Gtk.Template

Author: deltragon

safeeyes/glade/about_dialog.glade

@@ -35,10 +35,11 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;.</property>
   </object>
-  <object class="GtkWindow" id="window_about">
+  <template parent="GtkApplicationWindow" class="AboutDialog">
     <property name="title">Safe Eyes</property>
     <property name="resizable">0</property>
     <property name="icon-name">io.github.slgobinath.SafeEyes</property>
+    <signal name="close-request" handler="on_window_delete" swapped="no" />
     <child>
       <object class="GtkBox" id="layout_box">
         <property name="visible">1</property>
@@ -144,6 +145,7 @@ along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;.</pr
             </child>
             <child>
               <object class="GtkButton" id="btn_close">
+                <signal name="clicked" handler="on_close_clicked" swapped="no" />
                 <property name="label" translatable="yes">Close</property>
                 <property name="visible">1</property>
                 <property name="can-focus">1</property>
@@ -168,5 +170,5 @@ along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;.</pr
         </child>
       </object>
     </child>
-  </object>
+  </template>
 </interface>

safeeyes/ui/about_dialog.py

@@ -19,48 +19,56 @@
 """This module creates the AboutDialog which shows the version and license."""
 
 import os
+import gi
+
+gi.require_version("Gtk", "4.0")
+from gi.repository import Gtk
 
 from safeeyes import utility
 from safeeyes.translations import translate as _
 
 ABOUT_DIALOG_GLADE = os.path.join(utility.BIN_DIRECTORY, "glade/about_dialog.glade")
 
 
-class AboutDialog:
+@Gtk.Template(filename=ABOUT_DIALOG_GLADE)
+class AboutDialog(Gtk.ApplicationWindow):
     """AboutDialog reads the about_dialog.glade and build the user interface
     using that file.
 
     It shows the application name with version, a small description,
     license and the GitHub url.
     """
 
-    def __init__(self, application, version):
-        builder = utility.create_gtk_builder(ABOUT_DIALOG_GLADE)
-        self.window = builder.get_object("window_about")
-        self.window.set_application(application)
+    __gtype_name__ = "AboutDialog"
 
-        self.window.connect("close-request", self.on_window_delete)
-        builder.get_object("btn_close").connect("clicked", self.on_close_clicked)
+    lbl_decription = Gtk.Template.Child()
+    lbl_license = Gtk.Template.Child()
+    lbl_app_name = Gtk.Template.Child()
+
+    def __init__(self, application, version):
+        super().__init__(application=application)
 
-        builder.get_object("lbl_decription").set_label(
+        self.lbl_decription.set_label(
             _(
                 "Safe Eyes protects your eyes from eye strain (asthenopia) by reminding"
                 " you to take breaks while you're working long hours at the computer"
             )
         )
-        builder.get_object("lbl_license").set_label(_("License") + ":")
+        self.lbl_license.set_label(_("License") + ":")
 
         # Set the version at the runtime
-        builder.get_object("lbl_app_name").set_label("Safe Eyes " + version)
+        self.lbl_app_name.set_label("Safe Eyes " + version)
 
     def show(self):
         """Show the About dialog."""
-        self.window.present()
+        self.present()
 
+    @Gtk.Template.Callback()
     def on_window_delete(self, *args):
         """Window close event handler."""
-        self.window.destroy()
+        self.destroy()
 
+    @Gtk.Template.Callback()
     def on_close_clicked(self, *args):
         """Close button click event handler."""
-        self.window.destroy()
+        self.destroy()