Allow disabling the transition

src/preferences/SchedulePage.js

@@ -16,6 +16,7 @@ var SchedulePage = GObject.registerClass({
     GTypeName: 'SchedulePage',
     Template: `file://${GLib.build_filenamev([Me.path, 'preferences', 'ui', 'SchedulePage.ui'])}`,
     InternalChildren: [
+        'transition_switch',
         'manual_time_source_switch',
         'time_source_combo_row',
         'always_show_ondemand_switch',
@@ -35,6 +36,8 @@ var SchedulePage = GObject.registerClass({
         const colorSettings = new Gio.Settings({ schema: 'org.gnome.settings-daemon.plugins.color' });
         const locationSettings = new Gio.Settings({ schema: 'org.gnome.system.location' });
 
+        settings.bind('transition', this._transition_switch, 'active', Gio.SettingsBindFlags.DEFAULT);
+
         settings.bind('manual-time-source', this._manual_time_source_switch, 'active', Gio.SettingsBindFlags.DEFAULT);
 
         const choiceFilter = new Gtk.BoolFilter({ expression: Gtk.PropertyExpression.new(DropDownChoice, null, 'enabled') });

src/preferences/ui/SchedulePage.ui

@@ -8,6 +8,22 @@ SPDX-License-Identifier: GPL-3.0-or-later
     <property name="name">schedule</property>
     <property name="title" translatable="yes">Schedule</property>
     <property name="icon-name">nightthemeswitcher-schedule-symbolic</property>
+    <child>
+      <object class="AdwPreferencesGroup">
+        <child>
+          <object class="AdwActionRow">
+            <property name="title" translatable="yes">Transition</property>
+            <property name="subtitle" translatable="yes">Smooth transition between day and night appearance.</property>
+            <property name="activatable-widget">transition_switch</property>
+            <child>
+              <object class="GtkSwitch" id="transition_switch">
+                <property name="valign">center</property>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
     <child>
       <object class="AdwPreferencesGroup">
         <child>