feat: color scheme preference (#37)

* Add enumerations for ColorScheme

* PreferencesDialog: The dialog now sets the corresponding scheme to settings and Adwaita

* Set color scheme depending on user's preference when starting the app

data/dev.geopjr.tooth.gschema.xml

@@ -1,14 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <schemalist>
 
+  <enum id="dev.geopjr.tooth.ColorScheme">
+    <value value="0" nick="system"/>
+    <value value="1" nick="light"/>
+    <value value="2" nick="dark"/>
+  </enum>
+
 	<schema path="/dev/geopjr/tooth/" id="dev.geopjr.tooth" gettext-domain="dev.geopjr.tooth">
 
 		<key name="active-account" type="s">
 			<default>''</default>
 		</key>
-		<!-- <key name="dark-theme" type="b">
-			<default>false</default>
-		</key> -->
+		<key name="color-scheme" enum="dev.geopjr.tooth.ColorScheme">
+			<default>'system'</default>
+		</key>
 		<key name="autostart" type="b">
 			<default>false</default>
 		</key>

data/ui/dialogs/preferences.ui

@@ -20,18 +20,20 @@
         <child>
           <object class="AdwPreferencesGroup">
             <property name="title" translatable="yes">Appearance</property>
-            <!-- <child>
-              <object class="AdwActionRow">
-                <property name="title" translatable="yes">Dark theme</property>
-                <property name="activatable_widget">dark_theme</property>
-                <child>
-                  <object class="GtkSwitch" id="dark_theme">
-                    <property name="can_focus">0</property>
-                    <property name="valign">center</property>
-                  </object>
-                </child>
+            <child>
+              <object class="AdwComboRow" id="scheme_combo_row">
+                <property name="title" translatable="yes">Color Scheme</property>
+                <signal name="notify::selected-item" handler="on_scheme_changed" swapped="no"/>
+
+                <property name="model">
+                  <object class="ToothColorSchemeListModel"/>
+                </property>
+
+                <property name="expression">
+                  <lookup type="ToothColorSchemeListItem" name="name"/>
+                </property>
               </object>
-            </child> -->
+            </child>
             <child>
               <object class="AdwActionRow">
                 <property name="title" translatable="yes">Multiple Columns</property>

src/Application.vala

@@ -109,6 +109,10 @@ namespace Tooth {
 				error (msg);
 			}
 
+			var style_manager = Adw.StyleManager.get_default ();
+			ColorScheme color_scheme = (ColorScheme) settings.get_enum ("color-scheme");
+			style_manager.color_scheme = color_scheme.to_adwaita_scheme ();
+
 			set_accels_for_action ("app.about", ACCEL_ABOUT);
 			set_accels_for_action ("app.compose", ACCEL_NEW_POST);
 			set_accels_for_action ("app.back", ACCEL_BACK);

src/Dialogs/Preferences.vala

@@ -3,7 +3,7 @@ using Gtk;
 [GtkTemplate (ui = "/dev/geopjr/tooth/ui/dialogs/preferences.ui")]
 public class Tooth.Dialogs.Preferences : Adw.PreferencesWindow {
 
-    //  [GtkChild] unowned Switch dark_theme;
+    [GtkChild] unowned Adw.ComboRow scheme_combo_row;
     [GtkChild] unowned Switch autostart;
     [GtkChild] unowned Switch work_in_background;
     [GtkChild] unowned SpinButton timeline_page_size;
@@ -12,6 +12,10 @@ public class Tooth.Dialogs.Preferences : Adw.PreferencesWindow {
     [GtkChild] unowned Switch public_live_updates;
     [GtkChild] unowned Switch show_spoilers;
 
+ 	static construct {
+		typeof (ColorSchemeListModel).ensure ();
+	}
+
     construct {
         transient_for = app.main_window;
 
@@ -23,6 +27,9 @@ public class Tooth.Dialogs.Preferences : Adw.PreferencesWindow {
         //     return vis.get_name ();
         // });
 
+        // Setup scheme combo row
+        scheme_combo_row.selected = settings.get_enum ("color-scheme");
+
 		bind ();
         show ();
     }
@@ -42,4 +49,58 @@ public class Tooth.Dialogs.Preferences : Adw.PreferencesWindow {
         settings.bind ("show-spoilers", show_spoilers, "active", SettingsBindFlags.DEFAULT);
 	}
 
+	[GtkCallback]
+	private void on_scheme_changed () {
+		var selected_item = (ColorSchemeListItem) scheme_combo_row.selected_item;
+		var style_manager = Adw.StyleManager.get_default ();
+
+		style_manager.color_scheme = selected_item.adwaita_scheme;
+		settings.color_scheme = selected_item.color_scheme;
+	}
 }
+
+public class Tooth.ColorSchemeListModel : Object, ListModel {
+	private Gee.ArrayList<ColorSchemeListItem> array = new Gee.ArrayList<ColorSchemeListItem> ();
+
+	construct {
+		array.add (new ColorSchemeListItem (SYSTEM));
+		array.add (new ColorSchemeListItem (LIGHT));
+		array.add (new ColorSchemeListItem (DARK));
+	}
+
+	public Object? get_item (uint position)
+		requires (position < array.size)
+	{
+		return array.get ((int) position);
+	}
+
+	public Type get_item_type () {
+		return typeof(ColorSchemeListItem);
+	}
+
+	public uint get_n_items () {
+		return array.size;
+	}
+
+	public Object? get_object (uint position) {
+		return get_item (position);
+	}
+}
+
+public class Tooth.ColorSchemeListItem : Object {
+	public ColorScheme color_scheme { get; construct; }
+	public string name {
+		owned get {
+			return color_scheme.to_string ();
+		}
+	}
+	public Adw.ColorScheme adwaita_scheme {
+		get {
+			return color_scheme.to_adwaita_scheme ();
+		}
+	}
+
+	public ColorSchemeListItem (ColorScheme color_scheme) {
+		Object (color_scheme: color_scheme);
+	}
+}

src/Services/Settings.vala

@@ -3,7 +3,7 @@ using GLib;
 public class Tooth.Settings : GLib.Settings {
 
 	public string active_account { get; set; }
-	//  public bool dark_theme { get; set; }
+	public ColorScheme color_scheme { get; set; }
 	public bool autostart { get; set; }
 	public bool work_in_background { get; set; }
 	public int timeline_page_size { get; set; }
@@ -16,7 +16,7 @@ public class Tooth.Settings : GLib.Settings {
 	public Settings () {
 		Object (schema_id: Build.DOMAIN);
 		init ("active-account");
-		//  init ("dark-theme");
+		init ("color-scheme");
 		init ("autostart");
 		init ("work-in-background");
 		init ("timeline-page-size");
@@ -30,5 +30,36 @@ public class Tooth.Settings : GLib.Settings {
 	void init (string key) {
 		bind (key, this, key, SettingsBindFlags.DEFAULT);
 	}
-
 }
+
+public enum Tooth.ColorScheme {
+	SYSTEM,
+	LIGHT,
+	DARK;
+
+	public string to_string () {
+		switch (this) {
+			case SYSTEM:
+				return _("Follow System");
+			case LIGHT:
+				return _("Light");
+			case DARK:
+				return _("Dark");
+			default:
+				assert_not_reached ();
+		}
+	}
+
+	public Adw.ColorScheme to_adwaita_scheme () {
+		switch (this) {
+			case SYSTEM:
+				return DEFAULT;
+			case LIGHT:
+				return FORCE_LIGHT;
+			case DARK:
+				return FORCE_DARK;
+			default:
+				assert_not_reached ();
+		}
+	}
+}