Add native themed session locker and Settings integration

shell/ferese-settings/src/main.rs

@@ -58,6 +58,8 @@ enum Message {
     Undo,
     Preset(usize),
     PickWallpaper,
+    PreviewLock,
+    LockPreviewStarted(Result<(), String>),
     AddNote,
     NoteAction(String, widget::text_editor::Action),
     SaveNote(String, u64),
@@ -248,6 +250,35 @@ impl cosmic::Application for App {
                 }
                 Err(error) => self.error = Some(format!("Config reload failed: {error}")),
             },
+            Message::PreviewLock => {
+                let path = self.path.clone();
+                return Task::perform(
+                    async move {
+                        let binary = std::env::current_exe()
+                            .ok()
+                            .and_then(|p| p.parent().map(|p| p.join("ferese-lock")))
+                            .filter(|p| p.is_file())
+                            .unwrap_or_else(|| "ferese-lock".into());
+                        std::process::Command::new(binary)
+                            .arg("--preview")
+                            .arg("--config")
+                            .arg(path)
+                            .spawn()
+                            .map(|mut child| {
+                                std::thread::spawn(move || {
+                                    let _ = child.wait();
+                                });
+                            })
+                            .map_err(|error| format!("Could not open the lock preview: {error}"))
+                    },
+                    |result| cosmic::Action::App(Message::LockPreviewStarted(result)),
+                );
+            }
+            Message::LockPreviewStarted(result) => {
+                if let Err(error) = result {
+                    self.error = Some(error);
+                }
+            }
             Message::Page(page) => {
                 self.page = page;
                 self.search.clear();
@@ -671,6 +702,13 @@ impl cosmic::Application for App {
             }
 
             match self.page {
+                Page::LockScreen => {
+                    body = body.push(self.note("Uses your wallpaper, shell colors, font and corner radius from Appearance. Changes apply when the locker or preview opens."));
+                    body = body.push(
+                        button::standard("Preview lock screen").on_press(Message::PreviewLock),
+                    );
+                    body = body.push(self.note("The preview is an ordinary window and does not lock your session. Automatic locking is configured separately in Login items."));
+                }
                 Page::Desktop => {
                     let can_change_list =
                         !self.saving && !self.note_editors.values().any(|e| e.dirty);

shell/ferese-settings/src/schema.rs

@@ -5,6 +5,7 @@ pub enum Page {
     Desktop,
     Bar,
     Notifications,
+    LockScreen,
     Windows,
     Motion,
     Keyboard,
@@ -14,12 +15,13 @@ pub enum Page {
 }
 
 impl Page {
-    pub const ALL: [Self; 11] = [
+    pub const ALL: [Self; 12] = [
         Self::Appearance,
         Self::Wallpaper,
         Self::Desktop,
         Self::Bar,
         Self::Notifications,
+        Self::LockScreen,
         Self::Windows,
         Self::Motion,
         Self::Keyboard,
@@ -35,6 +37,7 @@ impl Page {
             Self::Desktop => "Desktop widgets",
             Self::Bar => "Menu bar",
             Self::Notifications => "Notifications",
+            Self::LockScreen => "Lock screen",
             Self::Windows => "Windows",
             Self::Motion => "Motion",
             Self::Keyboard => "Keyboard & mouse",
@@ -51,6 +54,7 @@ impl Page {
             Self::Desktop => "A clock that feels at home on your wallpaper.",
             Self::Bar => "Everything you need, within reach.",
             Self::Notifications => "Stay informed on your terms.",
+            Self::LockScreen => "Your desktop, safely put away.",
             Self::Windows => "Make room for the way you work.",
             Self::Motion => "Find your rhythm.",
             Self::Keyboard => "Fine-tune the everyday details.",
@@ -69,6 +73,7 @@ impl Page {
             Self::Desktop => "M21 12a9 9 0 1 1-18 0 9 9 0 0 1 18 0 M12 7v5l3 2",
             Self::Bar => "M3 5h18v14H3z M3 9h18 M6 7h.01 M18 7h.01",
             Self::Notifications => "M6 8a6 6 0 0 1 12 0v6l2 3H4l2-3z M10 21h4",
+            Self::LockScreen => "M7 10V7a5 5 0 0 1 10 0v3 M5 10h14v11H5z M12 14v3",
             Self::Windows => "M3 4h12v12H3z M8 9h13v12H8z",
             Self::Motion => "M3 8h9a3 3 0 1 0-3-3 M3 12h15a3 3 0 1 1-3 3 M3 16h5",
             Self::Keyboard => {
@@ -544,6 +549,49 @@ pub fn note_fields(index: usize) -> Vec<Field> {
 
 pub fn fields(page: Page) -> Vec<Field> {
     match page {
+        Page::LockScreen => vec![
+            toggle(
+                "lock_screen.show_clock",
+                "Show clock",
+                "Display the time above the sign-in card.",
+                true,
+            ),
+            toggle(
+                "lock_screen.show_date",
+                "Show date",
+                "Display the weekday and date.",
+                true,
+            ),
+            choice(
+                "lock_screen.clock_format",
+                "Clock format",
+                "Use a 12-hour or 24-hour clock.",
+                "24h",
+                &[("24h", "24-hour"), ("12h", "12-hour")],
+            ),
+            range(
+                "lock_screen.background_blur",
+                "Wallpaper softness",
+                "Blur the lock screen wallpaper. Zero keeps the original image sharp.",
+                18.0,
+                0.0,
+                40.0,
+                1.0,
+                "",
+                false,
+            ),
+            range(
+                "lock_screen.background_dim",
+                "Wallpaper dimming",
+                "Darken the wallpaper behind the clock and sign-in card.",
+                0.48,
+                0.0,
+                0.9,
+                0.02,
+                "",
+                false,
+            ),
+        ],
         Page::Appearance => vec![
             range(
                 "theme.geometry.shell_radius",