refactor: power-confirm via PowerAction table (v0.6.14)

Align the power-confirm flow to moonset's ActionDef pattern, in lockstep
with moongreet: a PowerAction table + create_power_button factory replace
the two hand-wired reboot/shutdown handlers and the loose-param
show_power_confirm. Add an in-flight re-trigger guard
(power_box.set_sensitive(false)) and clear a stale error_label when
showing a new prompt.

src/lockscreen.rs

@@ -170,55 +170,17 @@ pub fn create_lockscreen_window(
     power_box.set_margin_end(16);
     power_box.set_margin_bottom(16);
 
-    let reboot_btn = gtk::Button::new();
-    reboot_btn.set_icon_name("system-reboot-symbolic");
-    reboot_btn.add_css_class("power-button");
-    reboot_btn.set_tooltip_text(Some(strings.reboot_tooltip));
-    reboot_btn.connect_clicked(clone!(
-        #[weak]
-        confirm_area,
-        #[strong]
-        confirm_box,
-        #[weak]
-        error_label,
-        move |_| {
-            show_power_confirm(
-                strings.reboot_confirm,
-                power::reboot,
-                strings.reboot_failed,
-                strings,
-                &confirm_area,
-                &confirm_box,
-                &error_label,
-            );
-        }
-    ));
-    power_box.append(&reboot_btn);
-
-    let shutdown_btn = gtk::Button::new();
-    shutdown_btn.set_icon_name("system-shutdown-symbolic");
-    shutdown_btn.add_css_class("power-button");
-    shutdown_btn.set_tooltip_text(Some(strings.shutdown_tooltip));
-    shutdown_btn.connect_clicked(clone!(
-        #[weak]
-        confirm_area,
-        #[strong]
-        confirm_box,
-        #[weak]
-        error_label,
-        move |_| {
-            show_power_confirm(
-                strings.shutdown_confirm,
-                power::shutdown,
-                strings.shutdown_failed,
-                strings,
-                &confirm_area,
-                &confirm_box,
-                &error_label,
-            );
-        }
-    ));
-    power_box.append(&shutdown_btn);
+    for action in power_actions() {
+        let button = create_power_button(
+            action,
+            strings,
+            &power_box,
+            &confirm_area,
+            &confirm_box,
+            &error_label,
+        );
+        power_box.append(&button);
+    }
 
     overlay.add_overlay(&power_box);
 
@@ -688,23 +650,84 @@ fn set_default_avatar(
     image.set_icon_name(Some("avatar-default-symbolic"));
 }
 
+/// Definition for a single power-action button (reboot, shutdown).
+/// Couples icon, prompt, error text and action so a button cannot be wired
+/// with a mismatched prompt/action pair. Mirrors moonset's `ActionDef`.
+#[derive(Clone, Copy)]
+struct PowerAction {
+    icon_name: &'static str,
+    tooltip_attr: fn(&Strings) -> &'static str,
+    confirm_attr: fn(&Strings) -> &'static str,
+    error_attr: fn(&Strings) -> &'static str,
+    action_fn: fn() -> Result<(), PowerError>,
+}
+
+/// The power actions offered on the lockscreen.
+fn power_actions() -> [PowerAction; 2] {
+    [
+        PowerAction {
+            icon_name: "system-reboot-symbolic",
+            tooltip_attr: |s| s.reboot_tooltip,
+            confirm_attr: |s| s.reboot_confirm,
+            error_attr: |s| s.reboot_failed,
+            action_fn: power::reboot,
+        },
+        PowerAction {
+            icon_name: "system-shutdown-symbolic",
+            tooltip_attr: |s| s.shutdown_tooltip,
+            confirm_attr: |s| s.shutdown_confirm,
+            error_attr: |s| s.shutdown_failed,
+            action_fn: power::shutdown,
+        },
+    ]
+}
+
+/// Build a power-action icon button wired to the confirmation flow.
+fn create_power_button(
+    action: PowerAction,
+    strings: &'static Strings,
+    power_box: &gtk::Box,
+    confirm_area: &gtk::Box,
+    confirm_box: &Rc<RefCell<Option<gtk::Box>>>,
+    error_label: &gtk::Label,
+) -> gtk::Button {
+    let button = gtk::Button::new();
+    button.set_icon_name(action.icon_name);
+    button.add_css_class("power-button");
+    button.set_tooltip_text(Some((action.tooltip_attr)(strings)));
+    button.connect_clicked(clone!(
+        #[weak]
+        power_box,
+        #[weak]
+        confirm_area,
+        #[strong]
+        confirm_box,
+        #[weak]
+        error_label,
+        move |_| {
+            show_power_confirm(action, strings, &power_box, &confirm_area, &confirm_box, &error_label);
+        }
+    ));
+    button
+}
+
 /// Show inline power confirmation.
 fn show_power_confirm(
-    message: &'static str,
-    action_fn: fn() -> Result<(), PowerError>,
-    error_message: &'static str,
+    action: PowerAction,
     strings: &'static Strings,
+    power_box: &gtk::Box,
     confirm_area: &gtk::Box,
     confirm_box: &Rc<RefCell<Option<gtk::Box>>>,
     error_label: &gtk::Label,
 ) {
     dismiss_power_confirm(confirm_area, confirm_box);
+    error_label.set_visible(false);
 
     let new_box = gtk::Box::new(gtk::Orientation::Vertical, 8);
     new_box.set_halign(gtk::Align::Center);
     new_box.set_margin_top(16);
 
-    let confirm_label = gtk::Label::new(Some(message));
+    let confirm_label = gtk::Label::new(Some((action.confirm_attr)(strings)));
     confirm_label.add_css_class("confirm-label");
     new_box.append(&confirm_label);
 
@@ -714,6 +737,8 @@ fn show_power_confirm(
     let yes_btn = gtk::Button::with_label(strings.confirm_yes);
     yes_btn.add_css_class("confirm-yes");
     yes_btn.connect_clicked(clone!(
+        #[weak]
+        power_box,
         #[weak]
         confirm_area,
         #[strong]
@@ -721,8 +746,7 @@ fn show_power_confirm(
         #[weak]
         error_label,
         move |_| {
-            dismiss_power_confirm(&confirm_area, &confirm_box);
-            execute_power_action(action_fn, error_message, &error_label);
+            execute_power_action(action, strings, &power_box, &confirm_area, &confirm_box, &error_label);
         }
     ));
     button_row.append(&yes_btn);
@@ -753,28 +777,44 @@ fn dismiss_power_confirm(confirm_area: &gtk::Box, confirm_box: &Rc<RefCell<Optio
     }
 }
 
-/// Execute a power action in a background thread.
+/// Execute a power action in a background thread, guarding against re-trigger.
 fn execute_power_action(
-    action_fn: fn() -> Result<(), PowerError>,
-    error_message: &'static str,
+    action: PowerAction,
+    strings: &'static Strings,
+    power_box: &gtk::Box,
+    confirm_area: &gtk::Box,
+    confirm_box: &Rc<RefCell<Option<gtk::Box>>>,
     error_label: &gtk::Label,
 ) {
+    dismiss_power_confirm(confirm_area, confirm_box);
+
+    let action_fn = action.action_fn;
+    let error_message = (action.error_attr)(strings);
+
+    // Desensitize the power buttons so a double-click or keyboard repeat cannot
+    // fire the same action twice while it is in flight.
+    power_box.set_sensitive(false);
+
     glib::spawn_future_local(clone!(
+        #[weak]
+        power_box,
         #[weak]
         error_label,
         async move {
-            let result = gio::spawn_blocking(move || action_fn()).await;
+            let result = gio::spawn_blocking(action_fn).await;
             match result {
                 Ok(Ok(())) => {}
                 Ok(Err(e)) => {
                     log::error!("Power action failed: {e}");
                     error_label.set_text(error_message);
                     error_label.set_visible(true);
+                    power_box.set_sensitive(true);
                 }
                 Err(_) => {
                     log::error!("Power action panicked");
                     error_label.set_text(error_message);
                     error_label.set_visible(true);
+                    power_box.set_sensitive(true);
                 }
             }
         }