MainWindow.ui (Código)

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.38.2 -->
<interface>
    <requires lib="gtk+" version="3.24"/>
    <object class="GtkListStore" id="liststore">
        <columns>
            <!-- column-name software -->
            <column type="gchararray"/>
            <!-- column-name release -->
            <column type="gint"/>
            <!-- column-name language -->
            <column type="gchararray"/>
        </columns>
    </object>
    <object class="GtkTreeModelFilter" id="language-filter">
        <property name="child_model">liststore</property>
    </object>
    <template class="MainWindow" parent="GtkApplicationWindow">
        <property name="can_focus">False</property>
        <property name="title" translatable="yes">Gtk.TreeView filter</property>
        <property name="default_width">683</property>
        <property name="default_height">384</property>
        <property name="icon">../../../assets/icons/icon.png</property>
        <child type="titlebar">
            <placeholder/>
        </child>
        <child>
            <object class="GtkBox">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="border_width">12</property>
                <property name="orientation">vertical</property>
                <property name="spacing">6</property>
                <child>
                    <object class="GtkScrolledWindow">
                        <property name="visible">True</property>
                        <property name="can_focus">True</property>
                        <property name="shadow_type">in</property>
                        <child>
                            <object class="GtkTreeView" id="treeview">
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="tooltip_text" translatable="yes">2 Clique para selecionar</property>
                                <property name="model">language-filter</property>
                                <child internal-child="selection">
                                    <object class="GtkTreeSelection"/>
                                </child>
                                <child>
                                    <object class="GtkTreeViewColumn" id="col-software">
                                        <property name="title" translatable="yes">Software</property>
                                        <child>
                                            <object class="GtkCellRendererText" id="cellrender-software"/>
                                            <attributes>
                                                <attribute name="text">0</attribute>
                                            </attributes>
                                        </child>
                                    </object>
                                </child>
                                <child>
                                    <object class="GtkTreeViewColumn" id="col-release">
                                        <property name="title" translatable="yes">Lançamento</property>
                                        <child>
                                            <object class="GtkCellRendererText" id="cellrender-release"/>
                                            <attributes>
                                                <attribute name="text">1</attribute>
                                            </attributes>
                                        </child>
                                    </object>
                                </child>
                                <child>
                                    <object class="GtkTreeViewColumn" id="col-language">
                                        <property name="title" translatable="yes">Linguagem</property>
                                        <child>
                                            <object class="GtkCellRendererText" id="cellrender-language"/>
                                            <attributes>
                                                <attribute name="text">2</attribute>
                                            </attributes>
                                        </child>
                                    </object>
                                </child>
                            </object>
                        </child>
                    </object>
                    <packing>
                        <property name="expand">True</property>
                        <property name="fill">True</property>
                        <property name="position">0</property>
                    </packing>
                </child>
                <child>
                    <object class="GtkButtonBox">
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="layout_style">start</property>
                        <child>
                            <object class="GtkButton">
                                <property name="label" translatable="yes">Java</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                                <signal name="clicked" handler="on_button_clicked" swapped="no"/>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">0</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton">
                                <property name="label" translatable="yes">C</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                                <signal name="clicked" handler="on_button_clicked" swapped="no"/>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">1</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton">
                                <property name="label" translatable="yes">C++</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                                <signal name="clicked" handler="on_button_clicked" swapped="no"/>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">2</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton">
                                <property name="label" translatable="yes">Python</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                                <signal name="clicked" handler="on_button_clicked" swapped="no"/>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">3</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton">
                                <property name="label" translatable="yes">Todos</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                                <signal name="clicked" handler="on_button_clicked" swapped="no"/>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">4</property>
                            </packing>
                        </child>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="pack_type">end</property>
                        <property name="position">1</property>
                    </packing>
                </child>
            </object>
        </child>
    </template>
</interface>