Qt: Reduce game list jank after shutting down VM

Prevents progress bar briefly appearing, and the list scrolling to the
top when you exit a game.

src/core/game_list.cpp

@@ -119,15 +119,15 @@ static std::string GetCustomPropertiesFile();
 static FileSystem::ManagedCFilePtr OpenMemoryCardTimestampCache(bool for_write);
 static bool UpdateMemcardTimestampCache(const MemcardTimestampCacheEntry& entry);
 
-} // namespace GameList
-
-static std::vector<GameList::Entry> s_entries;
+static EntryList s_entries;
 static std::recursive_mutex s_mutex;
-static GameList::CacheMap s_cache_map;
-static std::vector<GameList::MemcardTimestampCacheEntry> s_memcard_timestamp_cache_entries;
+static CacheMap s_cache_map;
+static std::vector<MemcardTimestampCacheEntry> s_memcard_timestamp_cache_entries;
 
 static bool s_game_list_loaded = false;
 
+} // namespace GameList
+
 const char* GameList::GetEntryTypeName(EntryType type)
 {
   static std::array<const char*, static_cast<int>(EntryType::Count)> names = {
@@ -823,6 +823,13 @@ void GameList::Refresh(bool invalidate_cache, bool only_cache, ProgressCallback*
   CreateDiscSetEntries(played_time);
 }
 
+GameList::EntryList GameList::TakeEntryList()
+{
+  EntryList ret = std::move(s_entries);
+  s_entries = {};
+  return ret;
+}
+
 void GameList::CreateDiscSetEntries(const PlayedTimeMap& played_time_map)
 {
   std::unique_lock lock(s_mutex);

src/core/game_list.h

@@ -71,6 +71,8 @@ struct Entry
   ALWAYS_INLINE EntryType GetSortType() const { return (type == EntryType::DiscSet) ? EntryType::Disc : type; }
 };
 
+using EntryList = std::vector<Entry>;
+
 const char* GetEntryTypeName(EntryType type);
 const char* GetEntryTypeDisplayName(EntryType type);
 
@@ -97,6 +99,10 @@ bool IsGameListLoaded();
 /// If only_cache is set, no new files will be scanned, only those present in the cache.
 void Refresh(bool invalidate_cache, bool only_cache = false, ProgressCallback* progress = nullptr);
 
+/// Moves the current game list, which can be temporarily displayed in the UI until refresh completes.
+/// The caller **must** call Refresh() afterward, otherwise it will be permanently lost.
+EntryList TakeEntryList();
+
 /// Add played time for the specified serial.
 void AddPlayedTimeForSerial(const std::string& serial, std::time_t last_time, std::time_t add_time);
 void ClearPlayedTimeForSerial(const std::string& serial);

src/duckstation-qt/gamelistmodel.cpp

@@ -8,7 +8,6 @@
 #include "core/system.h"
 
 #include "common/file_system.h"
-#include "common/log.h"
 #include "common/path.h"
 #include "common/string_util.h"
 
@@ -21,8 +20,6 @@
 #include <QtGui/QIcon>
 #include <QtGui/QPainter>
 
-Log_SetChannel(GameList);
-
 static constexpr std::array<const char*, GameListModel::Column_Count> s_column_names = {
   {"Icon", "Serial", "Title", "File Title", "Developer", "Publisher", "Genre", "Year", "Players", "Time Played",
    "Last Played", "Size", "File Size", "Region", "Compatibility", "Cover"}};
@@ -334,9 +331,13 @@ int GameListModel::getCoverArtSpacing() const
 
 int GameListModel::rowCount(const QModelIndex& parent) const
 {
-  if (parent.isValid())
+  if (parent.isValid()) [[unlikely]]
     return 0;
 
+  if (m_taken_entries.has_value())
+    return static_cast<int>(m_taken_entries->size());
+
+  const auto lock = GameList::GetLock();
   return static_cast<int>(GameList::GetEntryCount());
 }
 
@@ -350,18 +351,32 @@ int GameListModel::columnCount(const QModelIndex& parent) const
 
 QVariant GameListModel::data(const QModelIndex& index, int role) const
 {
-  if (!index.isValid())
+  if (!index.isValid()) [[unlikely]]
     return {};
 
   const int row = index.row();
-  if (row < 0 || row >= static_cast<int>(GameList::GetEntryCount()))
-    return {};
+  DebugAssert(row >= 0);
 
-  const auto lock = GameList::GetLock();
-  const GameList::Entry* ge = GameList::GetEntryByIndex(row);
-  if (!ge)
-    return {};
+  if (m_taken_entries.has_value())
+  {
+    if (static_cast<u32>(row) >= m_taken_entries->size())
+      return {};
 
+    return data(index, role, &m_taken_entries.value()[row]);
+  }
+  else
+  {
+    const auto lock = GameList::GetLock();
+    const GameList::Entry* ge = GameList::GetEntryByIndex(static_cast<u32>(row));
+    if (!ge)
+      return {};
+
+    return data(index, role, ge);
+  }
+}
+
+QVariant GameListModel::data(const QModelIndex& index, int role, const GameList::Entry* ge) const
+{
   switch (role)
   {
     case Qt::DisplayRole:
@@ -544,10 +559,27 @@ QVariant GameListModel::headerData(int section, Qt::Orientation orientation, int
   return m_column_display_names[section];
 }
 
+bool GameListModel::hasTakenGameList() const
+{
+  return m_taken_entries.has_value();
+}
+
+void GameListModel::takeGameList()
+{
+  const auto lock = GameList::GetLock();
+  m_taken_entries = GameList::TakeEntryList();
+
+  // If it's empty (e.g. first boot), don't use it.
+  if (m_taken_entries->empty())
+    m_taken_entries.reset();
+}
+
 void GameListModel::refresh()
 {
   beginResetModel();
 
+  m_taken_entries.reset();
+
   // Invalidate memcard LRU cache, forcing a re-query of the memcard timestamps.
   m_memcard_pixmap_cache.Clear();
 

src/duckstation-qt/gamelistmodel.h

@@ -56,6 +56,9 @@ public:
 
   ALWAYS_INLINE const QString& getColumnDisplayName(int column) { return m_column_display_names[column]; }
 
+  bool hasTakenGameList() const;
+  void takeGameList();
+
   void refresh();
   void reloadThemeSpecificImages();
 
@@ -98,6 +101,8 @@ private:
   };
 #pragma pack(pop)
 
+  QVariant data(const QModelIndex& index, int role, const GameList::Entry* ge) const;
+
   void loadCommonImages();
   void loadThemeSpecificImages();
   void setColumnDisplayNames();
@@ -109,6 +114,8 @@ private:
 
   static QString formatTimespan(time_t timespan);
 
+  std::optional<GameList::EntryList> m_taken_entries;
+
   float m_cover_scale = 0.0f;
   bool m_show_titles_for_covers = false;
   bool m_show_game_icons = false;

src/duckstation-qt/gamelistrefreshthread.cpp

@@ -16,6 +16,11 @@ AsyncRefreshProgressCallback::AsyncRefreshProgressCallback(GameListRefreshThread
 {
 }
 
+float AsyncRefreshProgressCallback::timeSinceStart() const
+{
+  return m_start_time.GetTimeSeconds();
+}
+
 void AsyncRefreshProgressCallback::Cancel()
 {
   // Not atomic, but we don't need to cancel immediately.
@@ -87,7 +92,7 @@ void AsyncRefreshProgressCallback::ModalInformation(const std::string_view messa
 
 void AsyncRefreshProgressCallback::fireUpdate()
 {
-  m_parent->refreshProgress(m_status_text, m_last_value, m_last_range);
+  m_parent->refreshProgress(m_status_text, m_last_value, m_last_range, m_start_time.GetTimeSeconds());
 }
 
 GameListRefreshThread::GameListRefreshThread(bool invalidate_cache)
@@ -97,6 +102,11 @@ GameListRefreshThread::GameListRefreshThread(bool invalidate_cache)
 
 GameListRefreshThread::~GameListRefreshThread() = default;
 
+float GameListRefreshThread::timeSinceStart() const
+{
+  return m_progress.timeSinceStart();
+}
+
 void GameListRefreshThread::cancel()
 {
   m_progress.Cancel();

src/duckstation-qt/gamelistrefreshthread.h

@@ -16,6 +16,8 @@ class AsyncRefreshProgressCallback : public ProgressCallback
 public:
   AsyncRefreshProgressCallback(GameListRefreshThread* parent);
 
+  float timeSinceStart() const;
+
   void Cancel();
 
   void PushState() override;
@@ -33,7 +35,7 @@ private:
   void fireUpdate();
 
   GameListRefreshThread* m_parent;
-  Common::Timer m_last_update_time;
+  Common::Timer m_start_time;
   QString m_status_text;
   int m_last_range = 1;
   int m_last_value = 0;
@@ -47,10 +49,12 @@ public:
   GameListRefreshThread(bool invalidate_cache);
   ~GameListRefreshThread();
 
+  float timeSinceStart() const;
+
   void cancel();
 
 Q_SIGNALS:
-  void refreshProgress(const QString& status, int current, int total);
+  void refreshProgress(const QString& status, int current, int total, float time);
   void refreshComplete();
 
 protected:

src/duckstation-qt/gamelistwidget.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
 // SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
 
 #include "gamelistwidget.h"
@@ -182,9 +182,6 @@ void GameListWidget::initialize()
   connect(m_ui.searchText, &QLineEdit::textChanged, this,
           [this](const QString& text) { m_sort_model->setFilterName(text); });
 
-  // Works around a strange bug where after hiding the game list, the cursor for the whole window changes to a beam..
-  // m_ui.searchText->setCursor(QCursor(Qt::ArrowCursor));
-
   m_table_view = new QTableView(m_ui.stack);
   m_table_view->setModel(m_sort_model);
   m_table_view->setSortingEnabled(true);
@@ -285,6 +282,9 @@ void GameListWidget::refresh(bool invalidate_cache)
 {
   cancelRefresh();
 
+  if (!invalidate_cache)
+    m_model->takeGameList();
+
   m_refresh_thread = new GameListRefreshThread(invalidate_cache);
   connect(m_refresh_thread, &GameListRefreshThread::refreshProgress, this, &GameListWidget::onRefreshProgress,
           Qt::QueuedConnection);
@@ -314,14 +314,19 @@ void GameListWidget::reloadThemeSpecificImages()
   m_model->reloadThemeSpecificImages();
 }
 
-void GameListWidget::onRefreshProgress(const QString& status, int current, int total)
+void GameListWidget::onRefreshProgress(const QString& status, int current, int total, float time)
 {
+  // Avoid spamming the UI on very short refresh (e.g. game exit).
+  static constexpr float SHORT_REFRESH_TIME = 0.5f;
+  if (!m_model->hasTakenGameList())
+    m_model->refresh();
+
   // switch away from the placeholder while we scan, in case we find anything
   if (m_ui.stack->currentIndex() == 2)
     m_ui.stack->setCurrentIndex(Host::GetBaseBoolSettingValue("UI", "GameListGridView", false) ? 1 : 0);
 
-  m_model->refresh();
-  emit refreshProgress(status, current, total);
+  if (!m_model->hasTakenGameList() || time >= SHORT_REFRESH_TIME)
+    emit refreshProgress(status, current, total);
 }
 
 void GameListWidget::onRefreshComplete()

src/duckstation-qt/gamelistwidget.h

@@ -69,7 +69,7 @@ Q_SIGNALS:
   void layoutChange();
 
 private Q_SLOTS:
-  void onRefreshProgress(const QString& status, int current, int total);
+  void onRefreshProgress(const QString& status, int current, int total, float time);
   void onRefreshComplete();
 
   void onSelectionModelCurrentChanged(const QModelIndex& current, const QModelIndex& previous);