ui: use backend capabilities

src/backends/display-backend.vala

@@ -11,6 +11,24 @@ namespace TunerDisplays {
         public abstract string id { get; }
         public abstract string title { owned get; }
         public abstract bool can_apply { get; }
+        public virtual bool requires_connected_layout { get { return false; } }
+        public virtual bool preserves_disabled_monitor_position { get { return true; } }
+        public virtual bool supports_monitor_change_events { get { return false; } }
+        public virtual bool supports_global_mirroring { get { return false; } }
+        public virtual bool supports_primary_display { get { return false; } }
+        public virtual bool uses_separate_refresh_rate_controls { get { return false; } }
+        public virtual bool supports_output_mirroring { get { return false; } }
+        public virtual bool supports_description_identifier { get { return false; } }
+        public virtual bool supports_bit_depth { get { return false; } }
+        public virtual bool supports_vrr_modes { get { return false; } }
+        public virtual bool supports_adaptive_sync { get { return false; } }
+        public virtual bool supports_color_management { get { return false; } }
+        public virtual bool supports_hdr_metadata { get { return false; } }
+        public virtual bool supports_focus_at_startup { get { return false; } }
+        public virtual bool supports_backdrop_color { get { return false; } }
+        public virtual bool supports_hot_corners { get { return false; } }
+        public virtual bool supports_underscanning { get { return false; } }
+        public virtual bool supports_hdr_toggle { get { return false; } }
 
         public abstract Gee.ArrayList<MonitorConfig> load() throws Error;
         public abstract void apply(Gee.ArrayList<MonitorConfig> monitors) throws Error;

src/backends/gnome-backend.vala

@@ -13,6 +13,14 @@ namespace TunerDisplays {
         public override string id { get { return "gnome"; } }
         public override string title { owned get { return "GNOME"; } }
         public override bool can_apply { get { return true; } }
+        public override bool requires_connected_layout { get { return true; } }
+        public override bool preserves_disabled_monitor_position { get { return false; } }
+        public override bool supports_monitor_change_events { get { return true; } }
+        public override bool supports_global_mirroring { get { return true; } }
+        public override bool supports_primary_display { get { return true; } }
+        public override bool uses_separate_refresh_rate_controls { get { return true; } }
+        public override bool supports_underscanning { get { return true; } }
+        public override bool supports_hdr_toggle { get { return true; } }
 
         public override Gee.ArrayList<MonitorConfig> load() throws Error {
             var state = call_display_config("GetCurrentState", null, null);

src/backends/hyprland-backend.vala

@@ -22,6 +22,12 @@ namespace TunerDisplays {
         public override string id { get { return "hyprland"; } }
         public override string title { owned get { return "Hyprland"; } }
         public override bool can_apply { get { return true; } }
+        public override bool supports_output_mirroring { get { return true; } }
+        public override bool supports_description_identifier { get { return true; } }
+        public override bool supports_bit_depth { get { return true; } }
+        public override bool supports_vrr_modes { get { return true; } }
+        public override bool supports_color_management { get { return true; } }
+        public override bool supports_hdr_metadata { get { return true; } }
 
         public override Gee.ArrayList<MonitorConfig> load() throws Error {
             var monitors = new Gee.ArrayList<MonitorConfig>();

src/backends/niri-backend.vala

@@ -30,6 +30,10 @@ namespace TunerDisplays {
         public override string id { get { return "niri"; } }
         public override string title { owned get { return "niri"; } }
         public override bool can_apply { get { return true; } }
+        public override bool supports_adaptive_sync { get { return true; } }
+        public override bool supports_focus_at_startup { get { return true; } }
+        public override bool supports_backdrop_color { get { return true; } }
+        public override bool supports_hot_corners { get { return true; } }
 
         public override Gee.ArrayList<MonitorConfig> load() throws Error {
             var monitors = new Gee.ArrayList<MonitorConfig>();

src/plugin.vala

@@ -79,7 +79,7 @@ namespace TunerDisplays {
         }
 
         private MonitorSettingsContent create_monitor_page_content(MonitorConfig monitor) {
-            var content = new MonitorSettingsContent(monitor, view.backend_id, view.monitor_configs);
+            var content = new MonitorSettingsContent(monitor, view.display_backend, view.monitor_configs);
             content.monitor_changed.connect(view.refresh_from_monitors);
             return content;
         }

src/ui/displays-view.vala

@@ -18,7 +18,7 @@ namespace TunerDisplays {
         [GtkChild] private unowned Adw.PreferencesGroup status_group;
         public bool can_apply { get { return backend.can_apply; } }
         public Gee.ArrayList<MonitorConfig> monitor_configs { get { return monitors; } }
-        public string backend_id { owned get { return backend.id; } }
+        public DisplayBackend display_backend { get { return backend; } }
         public signal void monitor_settings_requested(MonitorConfig monitor);
 
         construct {
@@ -33,7 +33,7 @@ namespace TunerDisplays {
             layout = new MonitorLayout() {
                 height_request = 320,
                 hexpand = true,
-                require_connected = backend.id == "gnome",
+                require_connected = backend.requires_connected_layout,
                 can_focus = false,
                 focusable = false
             };
@@ -145,7 +145,7 @@ namespace TunerDisplays {
             } else {
                 add_gnome_primary_row();
                 foreach (var monitor in monitors) {
-                    var row = new MonitorRow(monitor, monitor_settings_page_id(), monitors, backend.id);
+                    var row = new MonitorRow(monitor, monitor_settings_page_id(), monitors, backend);
                     row.monitor_selected.connect(monitor => monitor_settings_requested(monitor));
                     row.monitor_changed.connect(() => layout.recenter());
                     monitors_group.add(row);
@@ -164,7 +164,7 @@ namespace TunerDisplays {
         }
 
         private void add_gnome_mirror_row() {
-            if (backend.id != "gnome" || monitors.size <= 1)
+            if (!backend.supports_global_mirroring || monitors.size <= 1)
                 return;
 
             var row = new Adw.SwitchRow() {
@@ -193,7 +193,7 @@ namespace TunerDisplays {
             if (monitors.size != 1)
                 return;
 
-            single_monitor_content = new MonitorSettingsContent(monitors[0], backend.id, monitors, false);
+            single_monitor_content = new MonitorSettingsContent(monitors[0], backend, monitors, false);
             single_monitor_content.monitor_changed.connect(refresh_from_monitors);
 
             while (single_monitor_content.get_group(0) != null) {
@@ -312,7 +312,7 @@ namespace TunerDisplays {
         }
 
         private void add_gnome_primary_row() {
-            if (backend.id != "gnome" || monitors.size <= 1)
+            if (!backend.supports_primary_display || monitors.size <= 1)
                 return;
 
             var model = new Gtk.StringList(null);
@@ -358,7 +358,7 @@ namespace TunerDisplays {
         }
 
         private bool gnome_mirror_enabled() {
-            return backend.id == "gnome" && monitors.size > 0 && monitors[0].mirrored;
+            return backend.supports_global_mirroring && monitors.size > 0 && monitors[0].mirrored;
         }
 
         private bool single_monitor_mode() {
@@ -366,7 +366,7 @@ namespace TunerDisplays {
         }
 
         private void subscribe_monitor_changes() {
-            if (backend.id != "gnome")
+            if (!backend.supports_monitor_change_events)
                 return;
 
             try {

src/ui/monitor-row.vala

@@ -4,13 +4,13 @@ namespace TunerDisplays {
         private MonitorConfig monitor;
         private Gee.ArrayList<MonitorConfig> all_monitors;
         private string page_id;
-        private string backend_id;
+        private DisplayBackend backend;
         private Gtk.Switch enabled_switch;
 
         public signal void monitor_changed();
         public signal void monitor_selected(MonitorConfig monitor);
 
-        public MonitorRow(MonitorConfig monitor, string page_id, Gee.ArrayList<MonitorConfig> all_monitors, string backend_id) {
+        public MonitorRow(MonitorConfig monitor, string page_id, Gee.ArrayList<MonitorConfig> all_monitors, DisplayBackend backend) {
             Object(
                 title: monitor.title,
                 subtitle: "%dx%d@%.2f  scale %.2f  %dx%d".printf(
@@ -20,7 +20,7 @@ namespace TunerDisplays {
             this.monitor = monitor;
             this.all_monitors = all_monitors;
             this.page_id = page_id;
-            this.backend_id = backend_id;
+            this.backend = backend;
             build();
         }
 
@@ -38,7 +38,7 @@ namespace TunerDisplays {
                 can_focus = true
             };
             enabled_switch.notify["active"].connect(() => {
-                if (enabled_switch.active != monitor.enabled && backend_id == "gnome")
+                if (enabled_switch.active != monitor.enabled && !backend.preserves_disabled_monitor_position)
                     place_monitor_after_active(monitor, all_monitors);
                 monitor.enabled = enabled_switch.active;
                 monitor_changed();