Now saving the window properties to GSettings; added some comments

data/de.privacynerd.colorcodes.gschema.xml

@@ -1,5 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <schemalist gettext-domain="colorcodes">
-	<schema id="de.privacynerd.colorcodes" path="/de/privacynerd/colorcodes/">
+	<schema id="de.privacynerd.colorcodes.state" path="/de/privacynerd/colorcodes/state/">
+    <key name="width" type="i">
+      <default>600</default>
+    </key>
+    <key name="height" type="i">
+      <default>300</default>
+    </key>
+    <key name="is-maximized" type="b">
+      <default>false</default>
+    </key>
+    <key name="is-fullscreen" type="b">
+      <default>false</default>
+    </key>
 	</schema>
 </schemalist>

src/window.py

@@ -17,14 +17,25 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from gi.repository import Adw
+from gi.repository import Adw, Gtk, Gio
-from gi.repository import Gtk
 
 @Gtk.Template(resource_path='/de/privacynerd/colorcodes/window.ui')
 class ColorcodesWindow(Adw.ApplicationWindow):
-    __gtype_name__ = 'ColorcodesWindow'
+    __gtype_name__ = 'ColorCodesWindow'
 
     label = Gtk.Template.Child()
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
+
+        # Restore state via GSettings
+        self.settings = Gio.Settings(schema_id="de.privacynerd.colorcodes.state")
+        self.settings.bind("width", self, "default-width",
+                           Gio.SettingsBindFlags.DEFAULT)
+        self.settings.bind("height", self, "default-height",
+                           Gio.SettingsBindFlags.DEFAULT)
+        self.settings.bind("is-maximized", self, "maximized",
+                           Gio.SettingsBindFlags.DEFAULT)
+        self.settings.bind("is-fullscreen", self, "fullscreened",
+                           Gio.SettingsBindFlags.DEFAULT)
+

src/window.ui

@@ -2,13 +2,40 @@
 <interface>
   <requires lib="gtk" version="4.0"/>
   <requires lib="Adw" version="1.0"/>
-  <template class="ColorcodesWindow" parent="AdwApplicationWindow">
+  <template class="ColorCodesWindow" parent="AdwApplicationWindow">
     <property name="default-width">600</property>
     <property name="default-height">300</property>
+    <property name="width-request">400</property>
+    <property name="height-request">250</property>
+    <property name="title">Color Codes</property>
+    <!-- A breakpoint to switch from top view switcher to a bottom switcher bar on small sizes (e.g. mobile) -->
+    <child>
+      <object class="AdwBreakpoint">
+        <condition>max-width: 450sp</condition>
+        <setter object="switcher_bar" property="reveal">True</setter>
+        <setter object="header_bar" property="title-widget"/>
+      </object>
+    </child>
+    <!-- Now the contents in a AdwToolbarView (pretty much standard) -->
     <property name="content">
       <object class="AdwToolbarView">
+        <!-- At the top, the AdwHeaderBar containing a AdwViewSwitcher shown at big sizes -->
         <child type="top">
           <object class="AdwHeaderBar" id="header_bar">
+            <!--<property name="title-widget">
+              <object class="AdwViewSwitcher">
+                <property name="stack">stack</property>
+                <property name="policy">wide</property>
+                <child>
+                  <object class="GtkButton">
+                    <property name="icon-name">open-menu-symbolic</property>
+                    <property name="tooltip-text" translatable="yes">Menu</property>
+                    <property name="label">Test</property>
+                  </object>
+                </child>
+              </object>
+            </property>-->
+            <!-- ...and the menu button for settings, info etc. -->
             <child type="end">
               <object class="GtkMenuButton">
                 <property name="primary">True</property>
@@ -19,6 +46,7 @@
             </child>
           </object>
         </child>
+        <!-- Now the content (previously the top bar was defined) -->
         <property name="content">
           <object class="GtkLabel" id="label">
             <property name="label">This is under massive development!</property>
@@ -27,6 +55,13 @@
             </style>
           </object>
         </property>
+        <!-- Now the bottom bar (previously the content property was defined) -->
+        <!-- This one's just displayed if the width of the window is too low -->
+        <!--<child type="bottom">
+          <object class="AdwViewSwitcherBar" id="switcher_bar">
+            <property name="stack">stack</property>
+          </object>
+        </child>-->
       </object>
     </property>
   </template>