1 files changed, 33 insertions, 3 deletions
diff --git a/src/ui/include/screen_playing.hpp b/src/ui/include/screen_playing.hpp
index 3eae32a7..148f2774 100644
--- a/src/ui/include/screen_playing.hpp
+++ b/src/ui/include/screen_playing.hpp
@@ -6,25 +6,55 @@
 
 #pragma once
 
+#include <stdint.h>
+#include <sys/_stdint.h>
 #include <memory>
+#include <vector>
 
 #include "lvgl.h"
 
 #include "database.hpp"
+#include "future_fetcher.hpp"
 #include "screen.hpp"
+#include "track.hpp"
+#include "track_queue.hpp"
 
 namespace ui {
 namespace screens {
 
+/*
+ * The 'Now Playing' / 'Currently Playing' screen that contains information
+ * about the current track, as well as playback controls.
+ */
 class Playing : public Screen {
  public:
-  explicit Playing(database::Track t);
+  explicit Playing(std::weak_ptr<database::Database> db,
+                   audio::TrackQueue* queue);
   ~Playing();
 
-  auto BindTrack(database::Track t) -> void;
+  auto Tick() -> void override;
+
+  // Callbacks invoked by the UI state machine in response to audio events.
+
+  auto OnTrackUpdate() -> void;
+  auto OnPlaybackUpdate(uint32_t, uint32_t) -> void;
+  auto OnQueueUpdate() -> void;
 
  private:
-  database::Track track_;
+  auto BindTrack(const database::Track& track) -> void;
+  auto ApplyNextUp(const std::vector<database::Track>& tracks) -> void;
+
+  std::weak_ptr<database::Database> db_;
+  audio::TrackQueue* queue_;
+
+  std::optional<database::Track> track_;
+  std::vector<database::Track> next_tracks_;
+
+  std::unique_ptr<database::FutureFetcher<std::optional<database::Track>>>
+      new_track_;
+  std::unique_ptr<
+      database::FutureFetcher<std::vector<std::optional<database::Track>>>>
+      new_next_tracks_;
 
   lv_obj_t* artist_label_;
   lv_obj_t* album_label_;