Added settings app (#27)

- Added Settings app to show all apps of type `AppTypeSettings`.
- Removed the `AppTypeSettings` apps from the Desktop app.

tactility/src/app_manifest.h

@@ -11,9 +11,13 @@ typedef struct _lv_obj_t lv_obj_t;
 typedef void* App;
 
 typedef enum {
+    /** A desktop app sits at the root of the app stack managed by the Loader service */
     AppTypeDesktop,
+    /** Standard apps, provided by the system. */
     AppTypeSystem,
+    /** The apps that are launched/shown by the Settings app. The Settings app itself is of type AppTypeSystem. */
     AppTypeSettings,
+    /** User-provided apps. */
     AppTypeUser
 } AppType;
 

tactility/src/apps/desktop/desktop.c

@@ -25,8 +25,6 @@ static void desktop_show(TT_UNUSED App app, TT_UNUSED lv_obj_t* parent) {
 
     lv_list_add_text(list, "System");
     tt_app_manifest_registry_for_each_of_type(AppTypeSystem, list, create_app_widget);
-    lv_list_add_text(list, "Settings");
-    tt_app_manifest_registry_for_each_of_type(AppTypeSettings, list, create_app_widget);
     lv_list_add_text(list, "User");
     tt_app_manifest_registry_for_each_of_type(AppTypeUser, list, create_app_widget);
 }

tactility/src/apps/settings/settings.c

@@ -0,0 +1,38 @@
+#include "app_manifest_registry.h"
+#include "check.h"
+#include "lvgl.h"
+#include "services/loader/loader.h"
+
+static void on_app_pressed(lv_event_t* e) {
+    lv_event_code_t code = lv_event_get_code(e);
+    if (code == LV_EVENT_CLICKED) {
+        const AppManifest* manifest = lv_event_get_user_data(e);
+        loader_start_app(manifest->id, false, NULL);
+    }
+}
+
+static void create_app_widget(const AppManifest* manifest, void* _Nullable parent) {
+    tt_check(parent);
+    lv_obj_t* list = (lv_obj_t*)parent;
+    lv_obj_t* btn = lv_list_add_btn(list, LV_SYMBOL_FILE, manifest->name);
+    lv_obj_add_event_cb(btn, &on_app_pressed, LV_EVENT_CLICKED, (void*)manifest);
+}
+
+static void on_show(TT_UNUSED App app, TT_UNUSED lv_obj_t* parent) {
+    lv_obj_t* list = lv_list_create(parent);
+    lv_obj_set_size(list, LV_PCT(100), LV_PCT(100));
+    lv_obj_center(list);
+
+    tt_app_manifest_registry_for_each_of_type(AppTypeSettings, list, create_app_widget);
+}
+
+const AppManifest settings_app = {
+    .id = "settings",
+    .name = "Settings",
+    .icon = NULL,
+    .type = AppTypeSystem,
+    .on_start = NULL,
+    .on_stop = NULL,
+    .on_show = &on_show,
+    .on_hide = NULL
+};

tactility/src/tactility.c

@@ -26,11 +26,13 @@ static const ServiceManifest* const system_services[] = {
 
 extern const AppManifest desktop_app;
 extern const AppManifest display_app;
+extern const AppManifest settings_app;
 extern const AppManifest system_info_app;
 
 static const AppManifest* const system_apps[] = {
     &desktop_app,
     &display_app,
+    &settings_app,
     &system_info_app
 };