Qt: Don't reset model for every scanned game

Make the UI a little more responsive.

src/duckstation-qt/gamelistrefreshthread.cpp

@@ -14,27 +14,30 @@
 
 #include "moc_gamelistrefreshthread.cpp"
 
-AsyncRefreshProgressCallback::AsyncRefreshProgressCallback(GameListRefreshThread* parent) : m_parent(parent)
+GameListRefreshThread::GameListRefreshThread(bool invalidate_cache) : QThread(), m_invalidate_cache(invalidate_cache)
 {
 }
 
-float AsyncRefreshProgressCallback::timeSinceStart() const
-{
-  return m_start_time.GetTimeSeconds();
-}
+GameListRefreshThread::~GameListRefreshThread() = default;
 
-void AsyncRefreshProgressCallback::Cancel()
+void GameListRefreshThread::cancel()
 {
   // Not atomic, but we don't need to cancel immediately.
   m_cancelled = true;
 }
 
-void AsyncRefreshProgressCallback::PushState()
+void GameListRefreshThread::run()
+{
+  GameList::Refresh(m_invalidate_cache, false, this);
+  emit refreshComplete();
+}
+
+void GameListRefreshThread::PushState()
 {
   ProgressCallback::PushState();
 }
 
-void AsyncRefreshProgressCallback::PopState()
+void GameListRefreshThread::PopState()
 {
   ProgressCallback::PopState();
 
@@ -46,7 +49,7 @@ void AsyncRefreshProgressCallback::PopState()
   fireUpdate();
 }
 
-void AsyncRefreshProgressCallback::SetStatusText(const std::string_view text)
+void GameListRefreshThread::SetStatusText(const std::string_view text)
 {
   const QString new_text = QtUtils::StringViewToQString(text);
   if (new_text == m_status_text)
@@ -56,7 +59,7 @@ void AsyncRefreshProgressCallback::SetStatusText(const std::string_view text)
   fireUpdate();
 }
 
-void AsyncRefreshProgressCallback::SetProgressRange(u32 range)
+void GameListRefreshThread::SetProgressRange(u32 range)
 {
   ProgressCallback::SetProgressRange(range);
   if (static_cast<int>(m_progress_range) == m_last_range)
@@ -66,7 +69,7 @@ void AsyncRefreshProgressCallback::SetProgressRange(u32 range)
   fireUpdate();
 }
 
-void AsyncRefreshProgressCallback::SetProgressValue(u32 value)
+void GameListRefreshThread::SetProgressValue(u32 value)
 {
   ProgressCallback::SetProgressValue(value);
   if (static_cast<int>(m_progress_value) == m_last_value)
@@ -76,46 +79,24 @@ void AsyncRefreshProgressCallback::SetProgressValue(u32 value)
   fireUpdate();
 }
 
-void AsyncRefreshProgressCallback::ModalError(const std::string_view message)
+void GameListRefreshThread::ModalError(const std::string_view message)
 {
   QMessageBox::critical(nullptr, QStringLiteral("Error"), QtUtils::StringViewToQString(message));
 }
 
-bool AsyncRefreshProgressCallback::ModalConfirmation(const std::string_view message)
+bool GameListRefreshThread::ModalConfirmation(const std::string_view message)
 {
   return QMessageBox::question(nullptr, QStringLiteral("Question"), QtUtils::StringViewToQString(message)) ==
          QMessageBox::Yes;
 }
 
-void AsyncRefreshProgressCallback::ModalInformation(const std::string_view message)
+void GameListRefreshThread::ModalInformation(const std::string_view message)
 {
   QMessageBox::information(nullptr, QStringLiteral("Information"), QtUtils::StringViewToQString(message));
 }
 
-void AsyncRefreshProgressCallback::fireUpdate()
+void GameListRefreshThread::fireUpdate()
 {
-  m_parent->refreshProgress(m_status_text, m_last_value, m_last_range, m_start_time.GetTimeSeconds());
-}
-
-GameListRefreshThread::GameListRefreshThread(bool invalidate_cache)
-  : QThread(), m_progress(this), m_invalidate_cache(invalidate_cache)
-{
-}
-
-GameListRefreshThread::~GameListRefreshThread() = default;
-
-float GameListRefreshThread::timeSinceStart() const
-{
-  return m_progress.timeSinceStart();
-}
-
-void GameListRefreshThread::cancel()
-{
-  m_progress.Cancel();
-}
-
-void GameListRefreshThread::run()
-{
-  GameList::Refresh(m_invalidate_cache, false, &m_progress);
-  emit refreshComplete();
+  emit refreshProgress(m_status_text, m_last_value, m_last_range, static_cast<int>(GameList::GetEntryCount()),
+                       m_start_time.GetTimeSeconds());
 }

src/duckstation-qt/gamelistrefreshthread.h

@@ -8,39 +8,7 @@
 #include "common/progress_callback.h"
 #include "common/timer.h"
 
-class GameListRefreshThread;
-
-class AsyncRefreshProgressCallback : public ProgressCallback
-{
-public:
-  explicit AsyncRefreshProgressCallback(GameListRefreshThread* parent);
-
-  float timeSinceStart() const;
-
-  void Cancel();
-
-  void PushState() override;
-  void PopState() override;
-
-  void SetStatusText(const std::string_view text) override;
-  void SetProgressRange(u32 range) override;
-  void SetProgressValue(u32 value) override;
-
-  void ModalError(const std::string_view message) override;
-  bool ModalConfirmation(const std::string_view message) override;
-  void ModalInformation(const std::string_view message) override;
-
-private:
-  void fireUpdate();
-
-  GameListRefreshThread* m_parent;
-  Timer m_start_time;
-  QString m_status_text;
-  int m_last_range = 1;
-  int m_last_value = 0;
-};
-
-class GameListRefreshThread final : public QThread
+class GameListRefreshThread final : public QThread, public ProgressCallback
 {
   Q_OBJECT
 
@@ -53,13 +21,29 @@ public:
   void cancel();
 
 Q_SIGNALS:
-  void refreshProgress(const QString& status, int current, int total, float time);
+  void refreshProgress(const QString& status, int current, int total, int entry_count, float time);
   void refreshComplete();
 
 protected:
   void run() final;
 
 private:
-  AsyncRefreshProgressCallback m_progress;
+  void PushState() override;
+  void PopState() override;
+
+  void SetStatusText(const std::string_view text) override;
+  void SetProgressRange(u32 range) override;
+  void SetProgressValue(u32 value) override;
+
+  void ModalError(const std::string_view message) override;
+  bool ModalConfirmation(const std::string_view message) override;
+  void ModalInformation(const std::string_view message) override;
+
+  void fireUpdate();
+
+  Timer m_start_time;
+  QString m_status_text;
+  int m_last_range = 1;
+  int m_last_value = 0;
   bool m_invalidate_cache;
 };

src/duckstation-qt/gamelistwidget.cpp

@@ -32,6 +32,7 @@
 #include <QtWidgets/QScrollBar>
 #include <QtWidgets/QStyledItemDelegate>
 #include <algorithm>
+#include <limits>
 
 #include "moc_gamelistwidget.cpp"
 
@@ -1281,6 +1282,7 @@ void GameListWidget::refresh(bool invalidate_cache)
           Qt::QueuedConnection);
   connect(m_refresh_thread, &GameListRefreshThread::refreshComplete, this, &GameListWidget::onRefreshComplete,
           Qt::QueuedConnection);
+  m_refresh_last_entry_count = std::numeric_limits<int>::max(); // force reset on first progress update
   m_refresh_thread->start();
 }
 
@@ -1336,12 +1338,25 @@ void GameListWidget::updateBackground(bool reload_image)
   });
 }
 
-void GameListWidget::onRefreshProgress(const QString& status, int current, int total, float time)
+void GameListWidget::onRefreshProgress(const QString& status, int current, int total, int entry_count, 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();
+  {
+    if (entry_count > m_refresh_last_entry_count)
+    {
+      m_model->beginInsertRows(QModelIndex(), m_refresh_last_entry_count, entry_count - 1);
+      m_model->endInsertRows();
+    }
+    else
+    {
+      m_model->beginResetModel();
+      m_model->endResetModel();
+    }
+
+    m_refresh_last_entry_count = entry_count;
+  }
 
   // switch away from the placeholder while we scan, in case we find anything
   if (m_ui.stack->currentIndex() == 2)

src/duckstation-qt/gamelistwidget.h

@@ -27,11 +27,14 @@ Q_DECLARE_METATYPE(const GameList::Entry*);
 
 class GameListSortModel;
 class GameListRefreshThread;
+class GameListWidget;
 
 class GameListModel final : public QAbstractTableModel
 {
   Q_OBJECT
 
+  friend GameListWidget;
+
 public:
   enum Column : int
   {
@@ -242,7 +245,7 @@ Q_SIGNALS:
   void addGameDirectoryRequested();
 
 private Q_SLOTS:
-  void onRefreshProgress(const QString& status, int current, int total, float time);
+  void onRefreshProgress(const QString& status, int current, int total, int entry_count, float time);
   void onRefreshComplete();
 
   void onCoverScaleChanged(float scale);
@@ -280,7 +283,8 @@ private:
   QWidget* m_empty_widget = nullptr;
   Ui::EmptyGameListWidget m_empty_ui;
 
-  GameListRefreshThread* m_refresh_thread = nullptr;
-
   QImage m_background_image;
+
+  GameListRefreshThread* m_refresh_thread = nullptr;
+  int m_refresh_last_entry_count = 0;
 };