dino/main/data/unified_window_placeholder.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
    <requires lib="gtk" version="4.0"/>
    <template class="DinoUiMainWindowPlaceholder">
        <child>
            <object class="GtkBox" id="box">
                <property name="orientation">vertical</property>
                <property name="hexpand">True</property>
                <property name="vexpand">True</property>
                <child>
                    <object class="GtkHeaderBar">
                        <property name="show-title-buttons">true</property>
                    </object>
                </child>
                <child>
                    <object class="GtkBox">
                        <property name="orientation">vertical</property>
                        <property name="valign">center</property>
                        <property name="hexpand">True</property>
                        <property name="vexpand">True</property>
                        <child>
                            <object class="AdwStatusPage" id="status_page">
                                <property name="icon-name">im.dino.Dino-symbolic</property>
                            </object>
                        </child>
                        <child>
                            <object class="GtkButton" id="primary_button">
                                <property name="halign">center</property>
                                <property name="visible">False</property>
                                <style>
                                    <class name="text-button"/>
                                    <class name="suggested-action"/>
                                </style>
                            </object>
                        </child>
                        <child>
                            <object class="GtkButton" id="secondary_button">
                                <property name="visible">0</property>
                                <property name="halign">center</property>
                                <property name="visible">False</property>
                                <style>
                                    <class name="text-button"/>
                                </style>
                            </object>
                        </child>
                    </object>
                </child>
            </object>
        </child>
    </template>
</interface>