Add modal dialog support

src/drivers/touchwheel.cpp

@@ -59,7 +59,6 @@ TouchWheel::TouchWheel() {
   for (int i = 5; i < 12; i++) {
     WriteRegister(Register::KEY_CONTROL_BASE + i, 1);
   }
-
 }
 
 TouchWheel::~TouchWheel() {}

src/ui/CMakeLists.txt

@@ -6,6 +6,7 @@ idf_component_register(
   SRCS "lvgl_task.cpp" "ui_fsm.cpp" "screen_splash.cpp" "screen_menu.cpp"
   "wheel_encoder.cpp" "screen_track_browser.cpp" "screen_playing.cpp"
   "themes.cpp" "widget_top_bar.cpp" "screen.cpp" "screen_onboarding.cpp"
+  "modal_progress.cpp" "modal.cpp" "modal_confirm.cpp"
   "splash.c" "font_fusion.c" "font_symbols.c"
   INCLUDE_DIRS "include"
   REQUIRES "drivers" "lvgl" "tinyfsm" "events" "system_fsm" "database" "esp_timer")

src/ui/include/modal.hpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+
+#include "core/lv_group.h"
+#include "core/lv_obj.h"
+#include "core/lv_obj_tree.h"
+#include "lvgl.h"
+#include "widget_top_bar.hpp"
+
+#include "screen.hpp"
+
+namespace ui {
+
+class Modal {
+ public:
+  Modal(Screen* host);
+  virtual ~Modal();
+
+  auto root() -> lv_obj_t* { return root_; }
+  auto group() -> lv_group_t* { return group_; }
+
+ protected:
+  lv_obj_t* const root_;
+  lv_group_t* const group_;
+
+ private:
+  Screen* host_;
+};
+
+}  // namespace ui

src/ui/include/modal_confirm.hpp

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "index.hpp"
+#include "lvgl.h"
+
+#include "modal.hpp"
+
+namespace ui {
+namespace modals {
+
+class Confirm : public Modal {
+ public:
+  Confirm(Screen*, const std::string& title, bool has_cancel);
+
+ private:
+  lv_obj_t* container_;
+};
+
+}  // namespace modals
+}  // namespace ui

src/ui/include/modal_progress.hpp

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "index.hpp"
+#include "lvgl.h"
+
+#include "modal.hpp"
+
+namespace ui {
+namespace modals {
+
+class Progress : public Modal {
+ public:
+  Progress(Screen*, std::string title);
+
+ private:
+  lv_obj_t* container_;
+};
+
+}  // namespace modals
+}  // namespace ui

src/ui/include/screen.hpp

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <memory>
+#include <optional>
 
 #include "core/lv_group.h"
 #include "core/lv_obj.h"
@@ -23,14 +24,8 @@ namespace ui {
  */
 class Screen {
  public:
-  Screen() : root_(lv_obj_create(NULL)), group_(lv_group_create()) {}
-
-  virtual ~Screen() {
-    // The group *must* be deleted first. Otherwise, focus events will be
-    // generated whilst deleting the object tree, which causes a big mess.
-    lv_group_del(group_);
-    lv_obj_del(root_);
-  }
+  Screen();
+  virtual ~Screen();
 
   /*
    * Called periodically to allow the screen to update itself, e.g. to handle
@@ -41,14 +36,27 @@ class Screen {
   auto UpdateTopBar(const widgets::TopBar::State& state) -> void;
 
   auto root() -> lv_obj_t* { return root_; }
-  auto group() -> lv_group_t* { return group_; }
+  auto content() -> lv_obj_t* { return content_; }
+
+  auto modal_content() -> lv_obj_t* { return modal_content_; }
+  auto modal_group(lv_group_t* g) -> void { modal_group_ = g; }
+  auto group() -> lv_group_t* {
+    if (modal_group_) {
+      return modal_group_;
+    }
+    return group_;
+  }
 
  protected:
   auto CreateTopBar(lv_obj_t* parent, const widgets::TopBar::Configuration&)
       -> widgets::TopBar*;
 
   lv_obj_t* const root_;
+  lv_obj_t* const content_;
+  lv_obj_t* const modal_content_;
+
   lv_group_t* const group_;
+  lv_group_t* modal_group_;
 
  private:
   std::unique_ptr<widgets::TopBar> top_bar_;

src/ui/include/ui_events.hpp

@@ -37,6 +37,9 @@ struct IndexSelected : tinyfsm::Event {
 
 struct BackPressed : tinyfsm::Event {};
 
+struct ModalConfirmPressed : tinyfsm::Event {};
+struct ModalCancelPressed : tinyfsm::Event {};
+
 }  // namespace internal
 
 }  // namespace ui

src/ui/include/ui_fsm.hpp

@@ -15,6 +15,7 @@
 #include "tinyfsm.hpp"
 
 #include "display.hpp"
+#include "modal.hpp"
 #include "screen.hpp"
 #include "storage.hpp"
 #include "system_events.hpp"
@@ -40,6 +41,8 @@ class UiState : public tinyfsm::Fsm<UiState> {
   /* Fallback event handler. Does nothing. */
   void react(const tinyfsm::Event& ev) {}
 
+  void react(const system_fsm::BatteryPercentChanged&);
+
   virtual void react(const audio::PlaybackStarted&) {}
   virtual void react(const audio::PlaybackUpdate&) {}
   virtual void react(const audio::QueueUpdate&) {}
@@ -49,6 +52,12 @@ class UiState : public tinyfsm::Fsm<UiState> {
   virtual void react(const internal::RecordSelected&) {}
   virtual void react(const internal::IndexSelected&) {}
   virtual void react(const internal::BackPressed&) {}
+  virtual void react(const internal::ModalCancelPressed&) {
+    sCurrentModal.reset();
+  }
+  virtual void react(const internal::ModalConfirmPressed&) {
+    sCurrentModal.reset();
+  }
 
   virtual void react(const system_fsm::DisplayReady&) {}
   virtual void react(const system_fsm::BootComplete&) {}
@@ -57,6 +66,7 @@ class UiState : public tinyfsm::Fsm<UiState> {
  protected:
   void PushScreen(std::shared_ptr<Screen>);
   void PopScreen();
+  void UpdateTopBar();
 
   static drivers::IGpios* sIGpios;
   static audio::TrackQueue* sQueue;
@@ -68,6 +78,7 @@ class UiState : public tinyfsm::Fsm<UiState> {
 
   static std::stack<std::shared_ptr<Screen>> sScreens;
   static std::shared_ptr<Screen> sCurrentScreen;
+  static std::shared_ptr<Modal> sCurrentModal;
 };
 
 namespace states {

src/ui/lvgl_task.cpp

@@ -35,6 +35,7 @@
 #include "misc/lv_color.h"
 #include "misc/lv_style.h"
 #include "misc/lv_timer.h"
+#include "modal.hpp"
 #include "relative_wheel.hpp"
 #include "tasks.hpp"
 #include "touchwheel.hpp"
@@ -75,6 +76,7 @@ void LvglMain(std::weak_ptr<drivers::RelativeWheel> weak_touch_wheel,
   TouchWheelEncoder encoder(weak_touch_wheel);
 
   std::shared_ptr<Screen> current_screen;
+  lv_group_t* current_group = nullptr;
   auto* events = events::queues::Ui();
   while (1) {
     while (events->Service(0)) {
@@ -88,6 +90,11 @@ void LvglMain(std::weak_ptr<drivers::RelativeWheel> weak_touch_wheel,
       current_screen = screen;
     }
 
+    if (current_screen->group() != current_group) {
+      current_group = current_screen->group();
+      lv_indev_set_group(encoder.registration(), current_group);
+    }
+
     if (current_screen) {
       current_screen->Tick();
     }

src/ui/modal.cpp

@@ -0,0 +1,57 @@
+
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "misc/lv_color.h"
+#include "modal_progress.hpp"
+
+#include "core/lv_event.h"
+#include "esp_log.h"
+
+#include "core/lv_group.h"
+#include "core/lv_obj_pos.h"
+#include "event_queue.hpp"
+#include "extra/widgets/list/lv_list.h"
+#include "extra/widgets/menu/lv_menu.h"
+#include "extra/widgets/spinner/lv_spinner.h"
+#include "hal/lv_hal_disp.h"
+#include "index.hpp"
+#include "misc/lv_area.h"
+#include "screen.hpp"
+#include "ui_events.hpp"
+#include "ui_fsm.hpp"
+#include "widget_top_bar.hpp"
+#include "widgets/lv_label.h"
+
+namespace ui {
+
+Modal::Modal(Screen* host)
+    : root_(lv_obj_create(host->modal_content())),
+      group_(lv_group_create()),
+      host_(host) {
+  lv_obj_set_style_bg_opa(host->modal_content(), LV_OPA_40, 0);
+  lv_obj_set_style_bg_color(host->modal_content(), lv_color_black(), 0);
+
+  lv_obj_set_size(root_, 120, LV_SIZE_CONTENT);
+  lv_obj_center(root_);
+
+  lv_obj_set_style_bg_opa(root_, LV_OPA_COVER, 0);
+  lv_obj_set_style_bg_color(root_, lv_color_white(), 0);
+
+  host_->modal_group(group_);
+}
+
+Modal::~Modal() {
+  host_->modal_group(nullptr);
+  lv_obj_set_style_bg_opa(host_->modal_content(), LV_OPA_TRANSP, 0);
+
+  // The group *must* be deleted first. Otherwise, focus events will be
+  // generated whilst deleting the object tree, which causes a big mess.
+  lv_group_del(group_);
+  lv_obj_del(root_);
+}
+
+}  // namespace ui

src/ui/modal_confirm.cpp

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "modal_confirm.hpp"
+
+#include "core/lv_event.h"
+#include "core/lv_obj.h"
+#include "core/lv_obj_tree.h"
+#include "esp_log.h"
+
+#include "core/lv_group.h"
+#include "core/lv_obj_pos.h"
+#include "event_queue.hpp"
+#include "extra/widgets/list/lv_list.h"
+#include "extra/widgets/menu/lv_menu.h"
+#include "extra/widgets/spinner/lv_spinner.h"
+#include "hal/lv_hal_disp.h"
+#include "index.hpp"
+#include "misc/lv_area.h"
+#include "ui_events.hpp"
+#include "ui_fsm.hpp"
+#include "widget_top_bar.hpp"
+#include "widgets/lv_btn.h"
+#include "widgets/lv_label.h"
+
+namespace ui {
+namespace modals {
+
+static void button_cancel_cb(lv_event_t* e) {
+  events::Ui().Dispatch(internal::ModalCancelPressed{});
+}
+
+static void button_confirm_cb(lv_event_t* e) {
+  events::Ui().Dispatch(internal::ModalConfirmPressed{});
+}
+
+Confirm::Confirm(Screen* host, const std::string& title_text, bool has_cancel)
+    : Modal(host) {
+  lv_obj_set_layout(root_, LV_LAYOUT_FLEX);
+  lv_obj_set_flex_flow(root_, LV_FLEX_FLOW_COLUMN);
+  lv_obj_set_flex_align(root_, LV_FLEX_ALIGN_SPACE_EVENLY, LV_FLEX_ALIGN_CENTER,
+                        LV_FLEX_ALIGN_CENTER);
+
+  lv_obj_t* title = lv_label_create(root_);
+  lv_label_set_text(title, title_text.c_str());
+  lv_obj_set_size(title, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
+
+  lv_obj_t* button_container = lv_obj_create(root_);
+  lv_obj_set_size(button_container, lv_pct(100), LV_SIZE_CONTENT);
+  lv_obj_set_layout(button_container, LV_LAYOUT_FLEX);
+  lv_obj_set_flex_flow(button_container, LV_FLEX_FLOW_ROW);
+  lv_obj_set_flex_align(button_container, LV_FLEX_ALIGN_SPACE_EVENLY,
+                        LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
+
+  if (has_cancel) {
+    lv_obj_t* cancel_btn = lv_btn_create(button_container);
+    lv_obj_t* cancel_label = lv_label_create(cancel_btn);
+    lv_label_set_text(cancel_label, "Cancel");
+    lv_group_add_obj(group_, cancel_btn);
+    lv_obj_add_event_cb(cancel_btn, button_cancel_cb, LV_EVENT_CLICKED, NULL);
+  }
+
+  lv_obj_t* ok_btn = lv_btn_create(button_container);
+  lv_obj_t* ok_label = lv_label_create(ok_btn);
+  lv_label_set_text(ok_label, "Okay");
+  lv_group_add_obj(group_, ok_btn);
+  lv_obj_add_event_cb(ok_btn, button_confirm_cb, LV_EVENT_CLICKED, NULL);
+}
+
+}  // namespace modals
+}  // namespace ui

src/ui/modal_progress.cpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "modal_progress.hpp"
+
+#include "core/lv_event.h"
+#include "core/lv_obj.h"
+#include "core/lv_obj_tree.h"
+#include "esp_log.h"
+
+#include "core/lv_group.h"
+#include "core/lv_obj_pos.h"
+#include "event_queue.hpp"
+#include "extra/widgets/list/lv_list.h"
+#include "extra/widgets/menu/lv_menu.h"
+#include "extra/widgets/spinner/lv_spinner.h"
+#include "hal/lv_hal_disp.h"
+#include "index.hpp"
+#include "misc/lv_area.h"
+#include "ui_events.hpp"
+#include "ui_fsm.hpp"
+#include "widget_top_bar.hpp"
+#include "widgets/lv_label.h"
+
+namespace ui {
+namespace modals {
+
+Progress::Progress(Screen* host, std::string title_text) : Modal(host) {
+  lv_obj_set_layout(root_, LV_LAYOUT_FLEX);
+  lv_obj_set_flex_flow(root_, LV_FLEX_FLOW_COLUMN);
+  lv_obj_set_flex_align(root_, LV_FLEX_ALIGN_SPACE_EVENLY, LV_FLEX_ALIGN_CENTER,
+                        LV_FLEX_ALIGN_CENTER);
+
+  lv_obj_t* title = lv_label_create(root_);
+  lv_label_set_text(title, title_text.c_str());
+  lv_obj_set_size(title, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
+
+  lv_obj_t* spinner = lv_spinner_create(root_, 3000, 45);
+  lv_obj_set_size(spinner, 16, 16);
+}
+
+}  // namespace modals
+}  // namespace ui

src/ui/screen.cpp

@@ -8,10 +8,38 @@
 
 #include <memory>
 
+#include "core/lv_obj_pos.h"
+#include "core/lv_obj_tree.h"
+#include "misc/lv_area.h"
+#include "misc/lv_color.h"
 #include "widget_top_bar.hpp"
 
 namespace ui {
 
+Screen::Screen()
+    : root_(lv_obj_create(NULL)),
+      content_(lv_obj_create(root_)),
+      modal_content_(lv_obj_create(root_)),
+      group_(lv_group_create()),
+      modal_group_(nullptr) {
+  lv_obj_set_size(root_, lv_pct(100), lv_pct(100));
+  lv_obj_set_size(content_, lv_pct(100), lv_pct(100));
+  lv_obj_set_size(modal_content_, lv_pct(100), lv_pct(100));
+  lv_obj_center(root_);
+  lv_obj_center(content_);
+  lv_obj_center(modal_content_);
+
+  lv_obj_set_style_bg_opa(modal_content_, LV_OPA_TRANSP, 0);
+  lv_obj_set_style_bg_color(modal_content_, lv_color_black(), 0);
+}
+
+Screen::~Screen() {
+  // The group *must* be deleted first. Otherwise, focus events will be
+  // generated whilst deleting the object tree, which causes a big mess.
+  lv_group_del(group_);
+  lv_obj_del(root_);
+}
+
 auto Screen::UpdateTopBar(const widgets::TopBar::State& state) -> void {
   if (top_bar_) {
     top_bar_->Update(state);

src/ui/screen_menu.cpp

@@ -37,18 +37,18 @@ static void item_click_cb(lv_event_t* ev) {
 }
 
 Menu::Menu(std::vector<database::IndexInfo> indexes) : indexes_(indexes) {
-  lv_obj_set_layout(root_, LV_LAYOUT_FLEX);
-  lv_obj_set_flex_flow(root_, LV_FLEX_FLOW_COLUMN);
-  lv_obj_set_flex_align(root_, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER,
+  lv_obj_set_layout(content_, LV_LAYOUT_FLEX);
+  lv_obj_set_flex_flow(content_, LV_FLEX_FLOW_COLUMN);
+  lv_obj_set_flex_align(content_, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER,
                         LV_FLEX_ALIGN_CENTER);
 
   widgets::TopBar::Configuration config{
       .show_back_button = false,
       .title = "",
   };
-  CreateTopBar(root_, config);
+  CreateTopBar(content_, config);
 
-  lv_obj_t* list = lv_list_create(root_);
+  lv_obj_t* list = lv_list_create(content_);
   lv_obj_set_size(list, lv_disp_get_hor_res(NULL), lv_disp_get_ver_res(NULL));
   lv_obj_center(list);
 

src/ui/screen_playing.cpp

@@ -106,17 +106,17 @@ Playing::Playing(std::weak_ptr<database::Database> db, audio::TrackQueue* queue)
       next_tracks_(),
       new_track_(),
       new_next_tracks_() {
-  lv_obj_set_layout(root_, LV_LAYOUT_FLEX);
+  lv_obj_set_layout(content_, LV_LAYOUT_FLEX);
   lv_group_set_wrap(group_, false);
 
-  lv_obj_set_size(root_, lv_pct(100), LV_SIZE_CONTENT);
-  lv_obj_set_flex_flow(root_, LV_FLEX_FLOW_COLUMN);
-  lv_obj_set_flex_align(root_, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_START,
+  lv_obj_set_size(content_, lv_pct(100), LV_SIZE_CONTENT);
+  lv_obj_set_flex_flow(content_, LV_FLEX_FLOW_COLUMN);
+  lv_obj_set_flex_align(content_, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_START,
                         LV_FLEX_ALIGN_START);
 
-  lv_obj_set_scrollbar_mode(root_, LV_SCROLLBAR_MODE_OFF);
+  lv_obj_set_scrollbar_mode(content_, LV_SCROLLBAR_MODE_OFF);
 
-  lv_obj_t* above_fold_container = lv_obj_create(root_);
+  lv_obj_t* above_fold_container = lv_obj_create(content_);
   lv_obj_set_layout(above_fold_container, LV_LAYOUT_FLEX);
   lv_obj_set_size(above_fold_container, lv_pct(100), lv_disp_get_ver_res(NULL));
   lv_obj_set_flex_flow(above_fold_container, LV_FLEX_FLOW_COLUMN);
@@ -182,7 +182,7 @@ Playing::Playing(std::weak_ptr<database::Database> db, audio::TrackQueue* queue)
   lv_obj_set_style_text_font(next_up_hint_, &font_symbols, 0);
   lv_obj_set_size(next_up_hint_, LV_SIZE_CONTENT, lv_pct(100));
 
-  next_up_container_ = lv_list_create(root_);
+  next_up_container_ = lv_list_create(content_);
   lv_obj_set_layout(next_up_container_, LV_LAYOUT_FLEX);
   lv_obj_set_size(next_up_container_, lv_pct(100), lv_disp_get_ver_res(NULL));
   lv_obj_set_flex_flow(next_up_container_, LV_FLEX_FLOW_COLUMN);
@@ -295,12 +295,12 @@ auto Playing::ApplyNextUp(const std::vector<database::Track>& tracks) -> void {
 }
 
 auto Playing::OnFocusAboveFold() -> void {
-  lv_obj_scroll_to_y(root_, 0, LV_ANIM_ON);
+  lv_obj_scroll_to_y(content_, 0, LV_ANIM_ON);
 }
 
 auto Playing::OnFocusBelowFold() -> void {
-  if (lv_obj_get_scroll_y(root_) < lv_obj_get_y(next_up_header_)) {
-    lv_obj_scroll_to_y(root_, lv_obj_get_y(next_up_header_), LV_ANIM_ON);
+  if (lv_obj_get_scroll_y(content_) < lv_obj_get_y(next_up_header_)) {
+    lv_obj_scroll_to_y(content_, lv_obj_get_y(next_up_header_), LV_ANIM_ON);
   }
 }
 

src/ui/screen_track_browser.cpp

@@ -69,14 +69,13 @@ TrackBrowser::TrackBrowser(
       loading_page_(move(initial_page)),
       initial_page_(),
       current_pages_() {
-  lv_obj_set_layout(root_, LV_LAYOUT_FLEX);
-  lv_obj_set_size(root_, lv_pct(100), lv_pct(100));
-  lv_obj_set_flex_flow(root_, LV_FLEX_FLOW_COLUMN);
-  lv_obj_set_flex_align(root_, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER,
+  lv_obj_set_layout(content_, LV_LAYOUT_FLEX);
+  lv_obj_set_flex_flow(content_, LV_FLEX_FLOW_COLUMN);
+  lv_obj_set_flex_align(content_, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER,
                         LV_FLEX_ALIGN_CENTER);
 
   // The default scrollbar is deceptive because we load in items progressively.
-  lv_obj_set_scrollbar_mode(root_, LV_SCROLLBAR_MODE_OFF);
+  lv_obj_set_scrollbar_mode(content_, LV_SCROLLBAR_MODE_OFF);
   // Wrapping behaves in surprising ways, again due to progressing loading.
   lv_group_set_wrap(group_, false);
 
@@ -84,10 +83,10 @@ TrackBrowser::TrackBrowser(
       .show_back_button = true,
       .title = title,
   };
-  auto top_bar = CreateTopBar(root_, config);
+  auto top_bar = CreateTopBar(content_, config);
   back_button_ = top_bar->button();
 
-  list_ = lv_list_create(root_);
+  list_ = lv_list_create(content_);
   lv_obj_set_width(list_, lv_pct(100));
   lv_obj_set_flex_grow(list_, 1);
   lv_obj_center(list_);

src/ui/ui_fsm.cpp

@@ -5,13 +5,18 @@
  */
 
 #include "ui_fsm.hpp"
+
 #include <memory>
-#include "audio_events.hpp"
+
 #include "core/lv_obj.h"
+#include "misc/lv_gc.h"
+
+#include "audio_events.hpp"
 #include "display.hpp"
 #include "event_queue.hpp"
 #include "gpios.hpp"
 #include "lvgl_task.hpp"
+#include "modal_confirm.hpp"
 #include "relative_wheel.hpp"
 #include "screen.hpp"
 #include "screen_menu.hpp"
@@ -23,6 +28,7 @@
 #include "touchwheel.hpp"
 #include "track_queue.hpp"
 #include "ui_events.hpp"
+#include "widget_top_bar.hpp"
 
 namespace ui {
 
@@ -40,6 +46,7 @@ std::weak_ptr<database::Database> UiState::sDb;
 
 std::stack<std::shared_ptr<Screen>> UiState::sScreens;
 std::shared_ptr<Screen> UiState::sCurrentScreen;
+std::shared_ptr<Modal> UiState::sCurrentModal;
 
 auto UiState::Init(drivers::IGpios* gpio_expander, audio::TrackQueue* queue)
     -> bool {
@@ -75,6 +82,7 @@ void UiState::PushScreen(std::shared_ptr<Screen> screen) {
     sScreens.push(sCurrentScreen);
   }
   sCurrentScreen = screen;
+  UpdateTopBar();
 }
 
 void UiState::PopScreen() {
@@ -83,12 +91,28 @@ void UiState::PopScreen() {
   }
   sCurrentScreen = sScreens.top();
   sScreens.pop();
+  UpdateTopBar();
 }
 
 void UiState::react(const system_fsm::KeyLockChanged& ev) {
   sDisplay->SetDisplayOn(ev.falling);
 }
 
+void UiState::react(const system_fsm::BatteryPercentChanged&) {
+  UpdateTopBar();
+}
+
+void UiState::UpdateTopBar() {
+  widgets::TopBar::State state{
+      .playback_state = widgets::TopBar::PlaybackState::kIdle,
+      .battery_percent = 50,
+      .is_charging = true,
+  };
+  if (sCurrentScreen) {
+    sCurrentScreen->UpdateTopBar(state);
+  }
+}
+
 namespace states {
 
 void Splash::exit() {