Qt: Show tooltip when adjusting icon/cover scale

src/duckstation-qt/gamelistwidget.cpp

@@ -31,6 +31,7 @@
 #include <QtWidgets/QMenu>
 #include <QtWidgets/QScrollBar>
 #include <QtWidgets/QStyledItemDelegate>
+#include <QtWidgets/QToolTip>
 #include <algorithm>
 #include <limits>
 
@@ -46,6 +47,7 @@ static constexpr int ICON_SIZE_STEP = 4;
 static constexpr int MIN_ICON_SIZE = 16;
 static constexpr int MAX_ICON_SIZE = 80;
 static constexpr float MIN_COVER_SCALE = 0.1f;
+static constexpr float DEFAULT_COVER_SCALE = 0.45f;
 static constexpr float MAX_COVER_SCALE = 2.0f;
 
 static const char* SUPPORTED_FORMATS_STRING =
@@ -145,7 +147,7 @@ GameListModel::GameListModel(GameListWidget* parent)
   : QAbstractTableModel(parent), m_device_pixel_ratio(QtUtils::GetDevicePixelRatioForWidget(parent)),
     m_icon_pixmap_cache(MIN_COVER_CACHE_SIZE)
 {
-  m_cover_scale = Host::GetBaseFloatSettingValue("UI", "GameListCoverArtScale", 0.45f);
+  m_cover_scale = Host::GetBaseFloatSettingValue("UI", "GameListCoverArtScale", DEFAULT_COVER_SCALE);
   m_icon_size = Host::GetBaseFloatSettingValue("UI", "GameListIconSize", MIN_ICON_SIZE);
   m_show_localized_titles = GameList::ShouldShowLocalizedTitles();
   m_show_titles_for_covers = Host::GetBaseBoolSettingValue("UI", "GameListShowCoverTitles", true);
@@ -1371,7 +1373,13 @@ void GameListWidget::initialize(QAction* actionGameList, QAction* actionGameGrid
   m_ui.showGridTitles->setDefaultAction(actionGridShowTitles);
   m_ui.showLocalizedTitles->setDefaultAction(actionShowLocalizedTitles);
 
+  // Configure scale slider for hover events
+  m_ui.scale->setAttribute(Qt::WA_Hover, true);
+  m_ui.scale->installEventFilter(this);
+
+  connect(m_ui.scale, &QSlider::sliderPressed, this, &GameListWidget::showScaleToolTip);
   connect(m_ui.scale, &QSlider::valueChanged, this, &GameListWidget::onScaleSliderChanged);
+
   connect(m_ui.filterType, &QComboBox::currentIndexChanged, this, [this](int index) {
     m_sort_model->setFilterType((index == 0) ? GameList::EntryType::MaxCount :
                                                static_cast<GameList::EntryType>(index - 1));
@@ -1718,6 +1726,36 @@ void GameListWidget::setViewMode(int stack_index)
   }
 }
 
+// Handles scale slider hover events
+bool GameListWidget::eventFilter(QObject* obj, QEvent* ev)
+{
+  if (obj != m_ui.scale)
+    return false;
+
+  switch (ev->type())
+  {
+    case QEvent::HoverEnter:
+      showScaleToolTip();
+      return true;
+    case QEvent::HoverLeave:
+      QToolTip::hideText();
+      return true;
+    default:
+      return false;
+  }
+}
+
+void GameListWidget::showScaleToolTip()
+{
+  const int value = m_ui.scale->value();
+  if (isShowingGameGrid())
+    QToolTip::showText(QCursor::pos(),
+                       QString("Cover scale: %1%").arg(static_cast<float>(value) / DEFAULT_COVER_SCALE, 0, 'f', 0));
+  else if (isShowingGameList())
+    QToolTip::showText(QCursor::pos(),
+                       QString("Icon size: %1%").arg((value * 100) / ICON_SIZE_STEP));
+}
+
 void GameListWidget::onScaleSliderChanged(int value)
 {
   if (isShowingGameGrid())
@@ -1736,6 +1774,7 @@ void GameListWidget::onScaleChanged()
 
   QSignalBlocker sb(m_ui.scale);
   m_ui.scale->setValue(value);
+  showScaleToolTip();
 }
 
 void GameListWidget::onIconSizeChanged(int size)

src/duckstation-qt/gamelistwidget.h

@@ -265,6 +265,8 @@ private Q_SLOTS:
   void onRefreshProgress(const QString& status, int current, int total, int entry_count, float time);
   void onRefreshComplete();
 
+  bool eventFilter(QObject* obj, QEvent* ev) override;
+  void showScaleToolTip();
   void onScaleSliderChanged(int value);
   void onScaleChanged();
   void onIconSizeChanged(int size);