MainWindow.ui (Código)

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.38.2 -->
<interface>
    <requires lib="gtk+" version="3.24"/>
    <template class="MainWindow" parent="GtkApplicationWindow">
        <property name="can_focus">False</property>
        <property name="title" translatable="yes">Gtk.ApplicationWindow</property>
        <property name="default_width">683</property>
        <property name="default_height">384</property>
        <property name="icon">../../../assets/icons/icon.png</property>
        <child>
            <placeholder/>
        </child>
    </template>
</interface>