Add a brightness slider to settings

src/system_fsm/booting.cpp

@@ -49,29 +49,23 @@ auto Booting::entry() -> void {
 
   sSamd.reset(drivers::Samd::Create());
   sAdc.reset(drivers::AdcBattery::Create());
-  assert(sSamd.get() && sAdc.get());
+  sNvs.reset(drivers::NvsStorage::Open());
+  assert(sSamd.get() && sAdc.get() && sNvs.get());
 
   sBattery.reset(new battery::Battery(sSamd.get(), sAdc.get()));
 
   // Start bringing up LVGL now, since we have all of its prerequisites.
   sTrackQueue.reset(new audio::TrackQueue());
   ESP_LOGI(kTag, "starting ui");
-  if (!ui::UiState::Init(sGpios.get(), sTrackQueue.get(), sBattery)) {
+  if (!ui::UiState::Init(sGpios.get(), sNvs, sTrackQueue.get(), sBattery)) {
     events::System().Dispatch(FatalError{});
     return;
   }
 
   // Install everything else that is certain to be needed.
   ESP_LOGI(kTag, "installing remaining drivers");
-  sNvs.reset(drivers::NvsStorage::Open());
   sTagParser.reset(new database::TagParserImpl());
 
-  if (!sNvs) {
-    events::System().Dispatch(FatalError{});
-    events::Ui().Dispatch(FatalError{});
-    return;
-  }
-
   // ESP_LOGI(kTag, "starting bluetooth");
   // sBluetooth.reset(new drivers::Bluetooth(sNvs.get()));
   // sBluetooth->Enable();

src/ui/include/screen_settings.hpp

@@ -6,12 +6,15 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <vector>
 
+#include "display.hpp"
 #include "index.hpp"
 #include "lvgl.h"
 
+#include "nvs.hpp"
 #include "screen.hpp"
 
 namespace ui {
@@ -20,16 +23,6 @@ namespace screens {
 class Settings : public MenuScreen {
  public:
   Settings();
-  ~Settings();
-
- private:
-  std::shared_ptr<Screen> bluetooth_;
-  std::shared_ptr<Screen> headphones_;
-  std::shared_ptr<Screen> appearance_;
-  std::shared_ptr<Screen> input_method_;
-  std::shared_ptr<Screen> storage_;
-  std::shared_ptr<Screen> firmware_update_;
-  std::shared_ptr<Screen> about_;
 };
 
 class Bluetooth : public MenuScreen {
@@ -44,7 +37,15 @@ class Headphones : public MenuScreen {
 
 class Appearance : public MenuScreen {
  public:
-  Appearance();
+  Appearance(drivers::NvsStorage* nvs, drivers::Display* display);
+
+  auto ChangeBrightness(uint_fast8_t) -> void;
+
+ private:
+  drivers::NvsStorage* nvs_;
+  drivers::Display* display_;
+
+  lv_obj_t* current_brightness_label_;
 };
 
 class InputMethod : public MenuScreen {

src/ui/include/ui_events.hpp

@@ -39,7 +39,16 @@ struct IndexSelected : tinyfsm::Event {
 struct BackPressed : tinyfsm::Event {};
 struct ShowNowPlaying : tinyfsm::Event {};
 struct ShowSettingsPage : tinyfsm::Event {
-  std::shared_ptr<Screen> screen;
+  enum class Page {
+    kRoot,
+    kBluetooth,
+    kHeadphones,
+    kAppearance,
+    kInput,
+    kStorage,
+    kFirmwareUpdate,
+    kAbout,
+  } page;
 };
 
 struct ModalConfirmPressed : tinyfsm::Event {};

src/ui/include/ui_fsm.hpp

@@ -11,6 +11,7 @@
 
 #include "audio_events.hpp"
 #include "battery.hpp"
+#include "nvs.hpp"
 #include "relative_wheel.hpp"
 #include "screen_playing.hpp"
 #include "tinyfsm.hpp"
@@ -29,6 +30,7 @@ namespace ui {
 class UiState : public tinyfsm::Fsm<UiState> {
  public:
   static auto Init(drivers::IGpios*,
+                   std::shared_ptr<drivers::NvsStorage>,
                    audio::TrackQueue*,
                    std::shared_ptr<battery::Battery>) -> bool;
 
@@ -81,6 +83,7 @@ class UiState : public tinyfsm::Fsm<UiState> {
   static std::shared_ptr<drivers::RelativeWheel> sRelativeWheel;
   static std::shared_ptr<drivers::Display> sDisplay;
   static std::shared_ptr<battery::Battery> sBattery;
+  static std::shared_ptr<drivers::NvsStorage> sNvs;
   static std::weak_ptr<database::Database> sDb;
 
   static std::stack<std::shared_ptr<Screen>> sScreens;

src/ui/screen_menu.cpp

@@ -31,8 +31,8 @@ static void now_playing_click_cb(lv_event_t* ev) {
 }
 
 static void settings_click_callback(lv_event_t* ev) {
-  std::shared_ptr<Screen> settings{new Settings()};
+  events::Ui().Dispatch(internal::ShowSettingsPage{
-  events::Ui().Dispatch(internal::ShowSettingsPage{.screen = settings});
+      .page = internal::ShowSettingsPage::Page::kRoot});
 }
 
 static void index_click_cb(lv_event_t* ev) {

src/ui/screen_settings.cpp

@@ -8,6 +8,7 @@
 
 #include "core/lv_event.h"
 #include "core/lv_obj.h"
+#include "display.hpp"
 #include "esp_log.h"
 
 #include "core/lv_group.h"
@@ -21,6 +22,7 @@
 #include "index.hpp"
 #include "misc/lv_anim.h"
 #include "misc/lv_area.h"
+#include "nvs.hpp"
 #include "screen.hpp"
 #include "ui_events.hpp"
 #include "ui_fsm.hpp"
@@ -35,51 +37,43 @@
 namespace ui {
 namespace screens {
 
+using Page = internal::ShowSettingsPage::Page;
+
 static void open_sub_menu_cb(lv_event_t* e) {
-  std::shared_ptr<Screen>* next_screen =
+  Page next_page = static_cast<Page>(reinterpret_cast<uintptr_t>(e->user_data));
-      reinterpret_cast<std::shared_ptr<Screen>*>(e->user_data);
   events::Ui().Dispatch(internal::ShowSettingsPage{
-      .screen = *next_screen,
+      .page = next_page,
   });
 }
 
 static void sub_menu(lv_obj_t* list,
                      lv_group_t* group,
                      const std::string& text,
-                     std::shared_ptr<Screen>* screen) {
+                     Page page) {
   lv_obj_t* item = lv_list_add_btn(list, NULL, text.c_str());
   lv_group_add_obj(group, item);
-  lv_obj_add_event_cb(item, open_sub_menu_cb, LV_EVENT_CLICKED, screen);
+  lv_obj_add_event_cb(item, open_sub_menu_cb, LV_EVENT_CLICKED,
+                      reinterpret_cast<void*>(static_cast<uintptr_t>(page)));
 }
 
-Settings::Settings()
+Settings::Settings() : MenuScreen("Settings") {
-    : MenuScreen("Settings"),
-      bluetooth_(new Bluetooth()),
-      headphones_(new Headphones()),
-      appearance_(new Appearance()),
-      input_method_(new InputMethod()),
-      storage_(new Storage()),
-      firmware_update_(new FirmwareUpdate()),
-      about_(new About()) {
   lv_obj_t* list = lv_list_create(content_);
   lv_obj_set_size(list, lv_pct(100), lv_pct(100));
 
   lv_list_add_text(list, "Audio");
-  sub_menu(list, group_, "Bluetooth", &bluetooth_);
+  sub_menu(list, group_, "Bluetooth", Page::kBluetooth);
-  sub_menu(list, group_, "Headphones", &headphones_);
+  sub_menu(list, group_, "Headphones", Page::kBluetooth);
 
   lv_list_add_text(list, "Interface");
-  sub_menu(list, group_, "Appearance", &appearance_);
+  sub_menu(list, group_, "Appearance", Page::kAppearance);
-  sub_menu(list, group_, "Input Method", &input_method_);
+  sub_menu(list, group_, "Input Method", Page::kInput);
 
   lv_list_add_text(list, "System");
-  sub_menu(list, group_, "Storage", &storage_);
+  sub_menu(list, group_, "Storage", Page::kStorage);
-  sub_menu(list, group_, "Firmware Update", &firmware_update_);
+  sub_menu(list, group_, "Firmware Update", Page::kFirmwareUpdate);
-  sub_menu(list, group_, "About", &about_);
+  sub_menu(list, group_, "About", Page::kAbout);
 }
 
-Settings::~Settings() {}
-
 static auto settings_container(lv_obj_t* parent) -> lv_obj_t* {
   lv_obj_t* res = lv_obj_create(parent);
   lv_obj_set_layout(res, LV_LAYOUT_FLEX);
@@ -152,13 +146,39 @@ Headphones::Headphones() : MenuScreen("Headphones") {
   lv_obj_set_size(current_balance_label, lv_pct(100), LV_SIZE_CONTENT);
 }
 
-Appearance::Appearance() : MenuScreen("Appearance") {
+static void change_brightness_cb(lv_event_t* ev) {
+  Appearance* instance = reinterpret_cast<Appearance*>(ev->user_data);
+  instance->ChangeBrightness(lv_slider_get_value(ev->target));
+}
+
+Appearance::Appearance(drivers::NvsStorage* nvs, drivers::Display* display)
+    : MenuScreen("Appearance"), nvs_(nvs), display_(display) {
   lv_obj_t* toggle_container = settings_container(content_);
   lv_obj_t* toggle_label = lv_label_create(toggle_container);
   lv_obj_set_flex_grow(toggle_label, 1);
   lv_label_set_text(toggle_label, "Dark Mode");
   lv_obj_t* toggle = lv_switch_create(toggle_container);
   lv_group_add_obj(group_, toggle);
+
+  lv_obj_t* brightness_label = lv_label_create(content_);
+  lv_label_set_text(brightness_label, "Brightness");
+  lv_obj_t* brightness = lv_slider_create(content_);
+  lv_obj_set_width(brightness, lv_pct(100));
+  lv_slider_set_range(brightness, 10, 100);
+  lv_slider_set_value(brightness, 50, LV_ANIM_OFF);
+  lv_group_add_obj(group_, brightness);
+  current_brightness_label_ = lv_label_create(content_);
+  lv_label_set_text(current_brightness_label_, "50%");
+  lv_obj_set_size(current_brightness_label_, lv_pct(100), LV_SIZE_CONTENT);
+
+  lv_obj_add_event_cb(brightness, change_brightness_cb, LV_EVENT_VALUE_CHANGED,
+                      this);
+}
+
+auto Appearance::ChangeBrightness(uint_fast8_t new_level) -> void {
+  display_->SetBrightness(new_level);
+  std::string new_str = std::to_string(new_level) + "%";
+  lv_label_set_text(current_brightness_label_, new_str.c_str());
 }
 
 InputMethod::InputMethod() : MenuScreen("Input Method") {

src/ui/ui_fsm.cpp

@@ -19,6 +19,7 @@
 #include "gpios.hpp"
 #include "lvgl_task.hpp"
 #include "modal_confirm.hpp"
+#include "nvs.hpp"
 #include "relative_wheel.hpp"
 #include "screen.hpp"
 #include "screen_menu.hpp"
@@ -46,6 +47,7 @@ std::shared_ptr<drivers::TouchWheel> UiState::sTouchWheel;
 std::shared_ptr<drivers::RelativeWheel> UiState::sRelativeWheel;
 std::shared_ptr<drivers::Display> UiState::sDisplay;
 std::shared_ptr<battery::Battery> UiState::sBattery;
+std::shared_ptr<drivers::NvsStorage> UiState::sNvs;
 std::weak_ptr<database::Database> UiState::sDb;
 
 std::stack<std::shared_ptr<Screen>> UiState::sScreens;
@@ -53,9 +55,11 @@ std::shared_ptr<Screen> UiState::sCurrentScreen;
 std::shared_ptr<Modal> UiState::sCurrentModal;
 
 auto UiState::Init(drivers::IGpios* gpio_expander,
+                   std::shared_ptr<drivers::NvsStorage> nvs,
                    audio::TrackQueue* queue,
                    std::shared_ptr<battery::Battery> battery) -> bool {
   sIGpios = gpio_expander;
+  sNvs = nvs;
   sQueue = queue;
   sBattery = battery;
 
@@ -160,7 +164,36 @@ void Browse::react(const internal::ShowNowPlaying& ev) {
 }
 
 void Browse::react(const internal::ShowSettingsPage& ev) {
-  PushScreen(ev.screen);
+  std::shared_ptr<Screen> screen;
+  switch (ev.page) {
+    case internal::ShowSettingsPage::Page::kRoot:
+      screen.reset(new screens::Settings());
+      break;
+    case internal::ShowSettingsPage::Page::kBluetooth:
+      screen.reset(new screens::Bluetooth());
+      break;
+    case internal::ShowSettingsPage::Page::kHeadphones:
+      screen.reset(new screens::Headphones());
+      break;
+    case internal::ShowSettingsPage::Page::kAppearance:
+      screen.reset(new screens::Appearance(sNvs.get(), sDisplay.get()));
+      break;
+    case internal::ShowSettingsPage::Page::kInput:
+      screen.reset(new screens::InputMethod());
+      break;
+    case internal::ShowSettingsPage::Page::kStorage:
+      screen.reset(new screens::Storage());
+      break;
+    case internal::ShowSettingsPage::Page::kFirmwareUpdate:
+      screen.reset(new screens::FirmwareUpdate());
+      break;
+    case internal::ShowSettingsPage::Page::kAbout:
+      screen.reset(new screens::About());
+      break;
+  }
+  if (screen) {
+    PushScreen(screen);
+  }
 }
 
 void Browse::react(const internal::RecordSelected& ev) {