desktop: prompt to power off on back button long press (#1279)

* desktop: prompt to power off on back button long press
   Implemented by launching Power Settings app, passing "off" as arg to
   directly jump to "power off" scene.

applications/desktop/scenes/desktop_scene_main.c

@@ -103,6 +103,15 @@ bool desktop_scene_main_on_event(void* context, SceneManagerEvent event) {
             consumed = true;
             break;
 
+        case DesktopMainEventOpenPowerOff: {
+            LoaderStatus status = loader_start(desktop->loader, "Power", "off");
+            if(status != LoaderStatusOk) {
+                FURI_LOG_E(TAG, "loader_start failed: %d", status);
+            }
+            consumed = true;
+            break;
+        }
+
         case DesktopMainEventOpenFavoritePrimary:
             LOAD_DESKTOP_SETTINGS(&desktop->settings);
             if(desktop->settings.favorite_primary < FLIPPER_APPS_COUNT) {

applications/desktop/views/desktop_events.h

@@ -8,6 +8,7 @@ typedef enum {
     DesktopMainEventOpenMenu,
     DesktopMainEventOpenDebug,
     DesktopMainEventOpenPassport, /**< Broken, don't use it */
+    DesktopMainEventOpenPowerOff,
 
     DesktopLockedEventUnlocked,
     DesktopLockedEventUpdate,

applications/desktop/views/desktop_view_main.c

@@ -53,6 +53,8 @@ bool desktop_main_input(InputEvent* event, void* context) {
             main_view->callback(DesktopMainEventOpenDebug, main_view->context);
         } else if(event->key == InputKeyLeft) {
             main_view->callback(DesktopMainEventOpenFavoriteSecondary, main_view->context);
+        } else if(event->key == InputKeyBack) {
+            main_view->callback(DesktopMainEventOpenPowerOff, main_view->context);
         }
     }
 

applications/power/power_settings_app/power_settings_app.c

@@ -18,7 +18,7 @@ static void power_settings_tick_event_callback(void* context) {
     scene_manager_handle_tick_event(app->scene_manager);
 }
 
-PowerSettingsApp* power_settings_app_alloc() {
+PowerSettingsApp* power_settings_app_alloc(uint32_t first_scene) {
     PowerSettingsApp* app = malloc(sizeof(PowerSettingsApp));
 
     // Records
@@ -52,7 +52,7 @@ PowerSettingsApp* power_settings_app_alloc() {
         app->view_dispatcher, PowerSettingsAppViewDialog, dialog_ex_get_view(app->dialog));
 
     // Set first scene
-    scene_manager_next_scene(app->scene_manager, PowerSettingsAppSceneStart);
+    scene_manager_next_scene(app->scene_manager, first_scene);
     return app;
 }
 
@@ -75,8 +75,11 @@ void power_settings_app_free(PowerSettingsApp* app) {
 }
 
 int32_t power_settings_app(void* p) {
-    UNUSED(p);
-    PowerSettingsApp* app = power_settings_app_alloc();
+    uint32_t first_scene = PowerSettingsAppSceneStart;
+    if(p && !strcmp(p, "off")) {
+        first_scene = PowerSettingsAppScenePowerOff;
+    }
+    PowerSettingsApp* app = power_settings_app_alloc(first_scene);
     view_dispatcher_run(app->view_dispatcher);
     power_settings_app_free(app);
     return 0;

applications/power/power_settings_app/scenes/power_settings_scene_power_off.c

@@ -28,7 +28,10 @@ bool power_settings_scene_power_off_on_event(void* context, SceneManagerEvent ev
 
     if(event.type == SceneManagerEventTypeCustom) {
         if(event.event == DialogExResultLeft) {
-            scene_manager_previous_scene(app->scene_manager);
+            if(!scene_manager_previous_scene(app->scene_manager)) {
+                scene_manager_stop(app->scene_manager);
+                view_dispatcher_stop(app->view_dispatcher);
+            }
         } else if(event.event == DialogExResultRight) {
             power_off(app->power);
         }