Make title bar a common component, some ui nits

src/ui/CMakeLists.txt

@@ -4,6 +4,7 @@
 
 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"
   "splash.c" "font_fusion.c" "font_symbols.c"
   INCLUDE_DIRS "include"
   REQUIRES "drivers" "lvgl" "tinyfsm" "events" "system_fsm" "database" "esp_timer")

src/ui/include/screen_track_browser.hpp

@@ -49,6 +49,7 @@ class TrackBrowser : public Screen {
       -> std::optional<database::IndexRecord>;
 
   std::weak_ptr<database::Database> db_;
+  lv_obj_t* back_button_;
   lv_obj_t* list_;
   lv_obj_t* loading_indicator_;
 

src/ui/include/ui_events.hpp

@@ -32,6 +32,8 @@ struct IndexSelected : tinyfsm::Event {
   database::IndexInfo index;
 };
 
+struct BackPressed : tinyfsm::Event {};
+
 }  // namespace internal
 
 }  // namespace ui

src/ui/include/ui_fsm.hpp

@@ -48,6 +48,7 @@ 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 system_fsm::DisplayReady&) {}
   virtual void react(const system_fsm::BootComplete&) {}
@@ -83,6 +84,7 @@ class Browse : public UiState {
 
   void react(const internal::RecordSelected&) override;
   void react(const internal::IndexSelected&) override;
+  void react(const internal::BackPressed&) override;
 
   void react(const system_fsm::KeyLockChanged&) override;
   void react(const system_fsm::StorageMounted&) override;
@@ -93,6 +95,8 @@ class Playing : public UiState {
   void entry() override;
   void exit() override;
 
+  void react(const internal::BackPressed&) override;
+
   void react(const audio::PlaybackStarted&) override;
   void react(const audio::PlaybackUpdate&) override;
   void react(const audio::QueueUpdate&) override;

src/ui/include/widget_top_bar.hpp

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <string>
+
+#include "lvgl.h"
+
+namespace ui {
+
+namespace widgets {
+
+class TopBar {
+ public:
+  TopBar(lv_obj_t* parent, lv_group_t* group);
+
+  auto set_title(const std::string&) -> void;
+
+  lv_obj_t* container_;
+  lv_obj_t* title_;
+  lv_obj_t* back_button_;
+};
+
+}  // namespace widgets
+
+}  // namespace ui

src/ui/screen_playing.cpp

@@ -37,6 +37,7 @@
 #include "track.hpp"
 #include "ui_events.hpp"
 #include "ui_fsm.hpp"
+#include "widget_top_bar.hpp"
 #include "widgets/lv_btn.h"
 #include "widgets/lv_img.h"
 #include "widgets/lv_label.h"
@@ -114,6 +115,8 @@ Playing::Playing(std::weak_ptr<database::Database> db, audio::TrackQueue* queue)
   lv_obj_set_flex_align(root_, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_START,
                         LV_FLEX_ALIGN_START);
 
+  lv_obj_set_scrollbar_mode(root_, LV_SCROLLBAR_MODE_OFF);
+
   lv_obj_t* above_fold_container = lv_obj_create(root_);
   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));
@@ -121,11 +124,8 @@ Playing::Playing(std::weak_ptr<database::Database> db, audio::TrackQueue* queue)
   lv_obj_set_flex_align(above_fold_container, LV_FLEX_ALIGN_SPACE_BETWEEN,
                         LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_START);
 
-  lv_obj_t* back_button = lv_btn_create(above_fold_container);
-  lv_obj_set_size(back_button, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
-  lv_obj_t* back_label = lv_label_create(back_button);
-  lv_label_set_text(back_label, "<");
-  lv_group_add_obj(group_, back_button);
+  widgets::TopBar top_bar(above_fold_container, group_);
+  top_bar.set_title("Now Playing");
 
   lv_obj_t* info_container = lv_obj_create(above_fold_container);
   lv_obj_set_layout(info_container, LV_LAYOUT_FLEX);

src/ui/screen_track_browser.cpp

@@ -31,6 +31,7 @@
 #include "screen_track_browser.hpp"
 #include "ui_events.hpp"
 #include "ui_fsm.hpp"
+#include "widget_top_bar.hpp"
 #include "widgets/lv_label.h"
 
 static constexpr char kTag[] = "browser";
@@ -70,29 +71,17 @@ TrackBrowser::TrackBrowser(
   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_START,
-                        LV_FLEX_ALIGN_START);
+  lv_obj_set_flex_align(root_, 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);
   // Wrapping behaves in surprising ways, again due to progressing loading.
   lv_group_set_wrap(group_, false);
 
-  lv_obj_t* header = lv_obj_create(root_);
-  lv_obj_set_size(header, lv_pct(100), 15);
-  lv_obj_set_flex_flow(header, LV_FLEX_FLOW_ROW);
-  lv_obj_set_flex_align(header, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_START,
-                        LV_FLEX_ALIGN_CENTER);
-
-  lv_obj_t* title_label = lv_label_create(header);
-  lv_label_set_text(title_label, title.c_str());
-  lv_obj_set_flex_grow(title_label, 1);
-
-  lv_obj_t* playback_label = lv_label_create(header);
-  lv_label_set_text(playback_label, LV_SYMBOL_PAUSE);
-
-  lv_obj_t* battery_label = lv_label_create(header);
-  lv_label_set_text(battery_label, LV_SYMBOL_BATTERY_2);
+  widgets::TopBar top_bar(root_, group_);
+  top_bar.set_title(title);
+  back_button_ = top_bar.back_button_;
 
   list_ = lv_list_create(root_);
   lv_obj_set_width(list_, lv_pct(100));
@@ -209,6 +198,7 @@ auto TrackBrowser::AddResults(Position pos,
   }
 
   lv_group_remove_all_objs(group_);
+  lv_group_add_obj(group_, back_button_);
   int num_children = lv_obj_get_child_cnt(list_);
   for (int i = 0; i < num_children; i++) {
     lv_group_add_obj(group_, lv_obj_get_child(list_, i));

src/ui/ui_fsm.cpp

@@ -20,6 +20,7 @@
 #include "system_events.hpp"
 #include "touchwheel.hpp"
 #include "track_queue.hpp"
+#include "ui_events.hpp"
 
 namespace ui {
 
@@ -147,6 +148,10 @@ void Browse::react(const internal::IndexSelected& ev) {
                                                      std::move(query)));
 }
 
+void Browse::react(const internal::BackPressed& ev) {
+  PopScreen();
+}
+
 static std::shared_ptr<screens::Playing> sPlayingScreen;
 
 void Playing::entry() {
@@ -171,6 +176,10 @@ void Playing::react(const audio::QueueUpdate& ev) {
   sPlayingScreen->OnQueueUpdate();
 }
 
+void Playing::react(const internal::BackPressed& ev) {
+  transit<Browse>();
+}
+
 }  // namespace states
 }  // namespace ui
 

src/ui/widget_top_bar.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "widget_top_bar.hpp"
+#include "core/lv_group.h"
+#include "core/lv_obj.h"
+#include "event_queue.hpp"
+#include "extra/layouts/flex/lv_flex.h"
+#include "ui_events.hpp"
+#include "ui_fsm.hpp"
+#include "widgets/lv_img.h"
+
+namespace ui {
+namespace widgets {
+
+static void back_click_cb(lv_event_t* ev) {
+  events::Dispatch<internal::BackPressed, UiState>({});
+}
+
+TopBar::TopBar(lv_obj_t* parent, lv_group_t* group) {
+  container_ = lv_obj_create(parent);
+  lv_obj_set_size(container_, lv_pct(100), 14);
+  lv_obj_set_flex_flow(container_, LV_FLEX_FLOW_ROW);
+  lv_obj_set_flex_align(container_, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_START,
+                        LV_FLEX_ALIGN_END);
+
+  back_button_ = lv_btn_create(container_);
+  lv_obj_set_size(back_button_, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
+  lv_obj_t* button_icon = lv_label_create(back_button_);
+  lv_label_set_text(button_icon, "<");
+
+  lv_group_add_obj(group, back_button_);
+  lv_obj_add_event_cb(back_button_, back_click_cb, LV_EVENT_CLICKED, NULL);
+
+  title_ = lv_label_create(container_);
+  lv_label_set_text(title_, "");
+  lv_obj_set_flex_grow(title_, 1);
+
+  lv_obj_t* playback_label = lv_label_create(container_);
+  lv_label_set_text(playback_label, LV_SYMBOL_PAUSE);
+
+  lv_obj_t* battery_label = lv_label_create(container_);
+  lv_label_set_text(battery_label, LV_SYMBOL_BATTERY_2);
+}
+
+auto TopBar::set_title(const std::string& new_title) -> void {
+  lv_label_set_text(title_, new_title.c_str());
+}
+
+}  // namespace widgets
+}  // namespace ui