[desktop] Add basic carousel view (#4112)

Adds a basic carousel view, or essentially a horizontal list a la Android/Qt Quick.

Lacks a lot of niceties like autoscroll, smooth shifts, etc. Will work on those later

Also fixed a bug introduced recently that capped game icon size to 8 at the low end, breaking the None option

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4112
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/common/settings_enums.h

@@ -158,7 +158,7 @@ ENUM(GpuUnswizzleChunk, VeryLow, Low, Normal, Medium, High)
 ENUM(TemperatureUnits, Celsius, Fahrenheit)
 ENUM(ExtendedDynamicState, Disabled, EDS1, EDS2, EDS3);
 ENUM(GpuLogLevel, Off, Errors, Standard, Verbose, All)
-ENUM(GameListMode, TreeView, GridView);
+ENUM(GameListMode, TreeView, GridView, CarouselView);
 ENUM(SpeedMode, Standard, Turbo, Slow);
 
 template <typename Type>

src/qt_common/config/uisettings.h

@@ -207,7 +207,7 @@ struct Values {
 
     // Game List
     Setting<bool> show_add_ons{linkage, true, "show_add_ons", Category::UiGameList};
-    Setting<u32, true> game_icon_size{linkage, 64, 8, 512, "game_icon_size", Category::UiGameList};
+    Setting<u32, true> game_icon_size{linkage, 64, 0, 512, "game_icon_size", Category::UiGameList};
     Setting<u32, true> folder_icon_size{linkage, 48, 8, 512, "folder_icon_size", Category::UiGameList};
     Setting<u8> row_1_text_id{linkage, 3, "row_1_text_id", Category::UiGameList};
     Setting<u8> row_2_text_id{linkage, 2, "row_2_text_id", Category::UiGameList};

src/qt_common/game_list/game_list_p.h

@@ -165,6 +165,7 @@ public:
                 return QStringLiteral("%1\n    %2").arg(row1, row2);
             }
             case Settings::GameListMode::GridView:
+            case Settings::GameListMode::CarouselView:
                 return row1;
             default:
                 break;

src/yuzu/CMakeLists.txt

@@ -240,7 +240,9 @@ add_executable(yuzu
 
     render/performance_overlay.h render/performance_overlay.cpp render/performance_overlay.ui
     updater/update_dialog.h updater/update_dialog.cpp updater/update_dialog.ui
-    game/common.h)
+    game/common.h
+    game/carousel.h game/carousel.cpp
+)
 
 set_target_properties(yuzu PROPERTIES OUTPUT_NAME "eden")
 

src/yuzu/game/carousel.cpp

@@ -0,0 +1,107 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "qt_common/config/uisettings.h"
+#include "qt_common/game_list/model.h"
+#include "yuzu/game/common.h"
+#include "yuzu/game/game_card.h"
+#include "yuzu/game/carousel.h"
+
+GameCarousel::GameCarousel(QWidget* parent) : QListView{parent} {
+    m_gameCard = new GameCard(this);
+    setItemDelegate(m_gameCard);
+
+    setViewMode(QListView::IconMode);
+    setMovement(QListView::Static);
+    setUniformItemSizes(true);
+    setSelectionMode(QAbstractItemView::SingleSelection);
+
+    setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
+    setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);
+
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    setEditTriggers(QAbstractItemView::NoEditTriggers);
+    setContextMenuPolicy(Qt::CustomContextMenu);
+
+    setSpacing(10);
+    setWordWrap(true);
+    setTextElideMode(Qt::ElideRight);
+    setFlow(QListView::LeftToRight);
+    setWrapping(false);
+}
+
+void GameCarousel::SetModel(GameListModel* model) {
+    QListView::setModel(model);
+    UpdateIconSize();
+}
+
+void GameCarousel::ApplyFilter(const QString& edit_filter_text, GameListModel* model) {
+    int row_count = model->rowCount();
+
+    for (int i = 0; i < row_count; ++i) {
+        QStandardItem* item = model->item(i, 0);
+        if (!item)
+            continue;
+
+        if (Yuzu::FilterMatches(edit_filter_text, item)) {
+            setRowHidden(i, false);
+        } else {
+            setRowHidden(i, true);
+        }
+    }
+}
+
+void GameCarousel::UpdateIconSize() {
+    const u32 icon_size = UISettings::values.game_icon_size.GetValue();
+
+    int heightMargin = 0;
+    int widthMargin = 80;
+
+    // TODO(crueter): get rid of this nonsense
+    if (UISettings::values.show_game_name) {
+        switch (icon_size) {
+        case 128:
+            heightMargin = 65;
+            break;
+        case 0:
+            widthMargin = 120;
+            heightMargin = 120;
+            break;
+        case 64:
+            heightMargin = 77;
+            break;
+        case 32:
+        case 256:
+            heightMargin = 81;
+            break;
+        }
+    } else {
+        widthMargin = 24;
+        heightMargin = 24;
+    }
+
+    const int min_item_width = icon_size + widthMargin;
+    const int min_item_height = icon_size + heightMargin;
+    const int grid_height = std::max(min_item_height, viewport()->height());
+
+    QSize content_size(min_item_width, min_item_height);
+    QSize grid_size(min_item_width, grid_height);
+    if (gridSize() != grid_size) {
+        setUpdatesEnabled(false);
+
+        setGridSize(grid_size);
+        m_gameCard->setSize(grid_size, content_size, 0, 0);
+
+        setUpdatesEnabled(true);
+    }
+}
+
+QModelIndex GameCarousel::indexAt(const QPoint& point) const {
+    QModelIndex index = QListView::indexAt(point);
+    if (!index.isValid())
+        return {};
+    if (m_gameCard && !m_gameCard->hitTest(point, index, this, visualRect(index)))
+        return {};
+    return index;
+}

src/yuzu/game/carousel.h

@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QListView>
+#include <QString>
+
+class GameCard;
+class GameListModel;
+class QResizeEvent;
+
+class GameCarousel : public QListView {
+    Q_OBJECT
+
+public:
+    explicit GameCarousel(QWidget* parent = nullptr);
+
+    void SetModel(GameListModel* model);
+    void ApplyFilter(const QString& edit_filter_text, GameListModel* model);
+    void UpdateIconSize();
+
+    QModelIndex indexAt(const QPoint& point) const override;
+
+private:
+    GameCard* m_gameCard = nullptr;
+};

src/yuzu/game/game_card.cpp

@@ -18,27 +18,16 @@ void GameCard::paint(QPainter* painter, const QStyleOptionViewItem& option,
     painter->save();
     painter->setRenderHint(QPainter::Antialiasing);
 
-    constexpr int cardMargin = 8;
     constexpr int cardCornerRadius = 10;
 
-    const int column = index.row() % m_columns;
+    const QRect cardRect = getCardRect(option, index);
-    const int cell_width = option.rect.width();
-    const int card_width = cell_width - m_padding;
-
-    const int row_width = m_columns * cell_width;
-    const int total_gap = row_width - cardMargin * 2 - m_columns * card_width;
-    const int gap = (m_columns > 1) ? (total_gap / (m_columns - 1)) : 0;
-
-    const int card_left = option.rect.left() - column * cell_width + cardMargin + column * (card_width + gap) + 4;
-    const QRect cardRect(card_left, option.rect.top() + 4, card_width - 8,
-                         option.rect.height() - cardMargin);
 
     QPalette palette = option.palette;
     QColor backgroundColor = palette.window().color();
     QColor borderColor = palette.dark().color();
     QColor textColor = palette.text().color();
 
-    // highlight blue on select
+    // highlight on select or hover
     if (option.state & QStyle::State_Selected) {
         backgroundColor = palette.highlight().color();
         borderColor = palette.highlight().color().lighter(150);
@@ -60,7 +49,7 @@ void GameCard::paint(QPainter* painter, const QStyleOptionViewItem& option,
         scaled.scale(icon_size, icon_size, Qt::KeepAspectRatio);
 
         iconRect = {cardRect.left() + (cardRect.width() - scaled.width()) / 2,
-                    cardRect.top() + cardMargin, scaled.width(), scaled.height()};
+                    cardRect.top() + cardMargin - 1, scaled.width(), scaled.height()};
 
         painter->setRenderHint(QPainter::SmoothPixmapTransform, true);
 
@@ -94,12 +83,62 @@ void GameCard::paint(QPainter* painter, const QStyleOptionViewItem& option,
     painter->restore();
 }
 
+QRect GameCard::getCardRect(const QStyleOptionViewItem& option, const QModelIndex& index) const {
+    const int cell_width = option.rect.width();
+
+    const int card_width = cell_width - m_padding;
+
+    int card_left, card_top, card_height;
+
+    if (m_columns >= 1) {
+        // grid mode
+
+        // center everything in-line, such that the leftmost and rightmost cards
+        // have ~ equal padding to the edge of the viewport
+        // spacing between each card is larger, but equal to each other
+        const int column = index.row() % m_columns;
+
+        const int row_width = m_columns * cell_width;
+        const int total_gap = row_width - cardMargin * 2 - m_columns * card_width;
+        const int gap = (m_columns > 1) ? (total_gap / (m_columns - 1)) : 0;
+        card_left =
+            option.rect.left() - column * cell_width + cardMargin + column * (card_width + gap) + 4;
+
+        // fill cell vertically
+        card_top = option.rect.top() + cardMargin;
+        card_height = option.rect.height() - cardMargin - 1;
+    } else {
+        // carousel mode
+        card_left = option.rect.left() + cardMargin + 4;
+
+        // the delegate itself takes up the full height, but the card itself
+        // gets centered
+        const int content_height = m_contentSize.height() - cardMargin;
+        const int cell_height = option.rect.height();
+
+        card_height = std::min(content_height, cell_height - cardMargin * 2) - 1;
+        card_top = option.rect.top() + (cell_height - card_height) / 2;
+    }
+
+    return QRect(card_left, card_top, card_width - cardMargin, card_height);
+}
+
+bool GameCard::hitTest(const QPoint& point, const QModelIndex& index, const QWidget* widget,
+                       const QRect& cellRect) const {
+    QStyleOptionViewItem option;
+    option.initFrom(widget);
+    option.rect = cellRect;
+    return getCardRect(option, index).contains(point);
+}
+
 QSize GameCard::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const {
     return m_size;
 }
 
-void GameCard::setSize(const QSize& newSize, const int padding, const int columns) {
+void GameCard::setSize(const QSize& newSize, const QSize& contentSize, const int padding,
+                       const int columns) {
     m_size = newSize;
+    m_contentSize = contentSize;
     m_padding = padding;
     m_columns = columns;
 }

src/yuzu/game/game_card.h

@@ -17,11 +17,19 @@ public:
     void paint(QPainter* painter, const QStyleOptionViewItem& option,
                const QModelIndex& index) const override;
 
+    QRect getCardRect(const QStyleOptionViewItem &option, const QModelIndex &index) const;
+
+    bool hitTest(const QPoint& point, const QModelIndex& index,
+                 const QWidget* widget, const QRect& cellRect) const;
+
     QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
-    void setSize(const QSize& newSize, const int padding, const int columns);
+    void setSize(const QSize& newSize, const QSize& contentSize, const int padding, const int columns);
 
 private:
+    static constexpr int cardMargin = 8;
+
     QSize m_size;
+    QSize m_contentSize;
     int m_padding;
     int m_columns;
 };

src/yuzu/game/game_grid.cpp

@@ -25,8 +25,6 @@ GameGrid::GameGrid(QWidget* parent) : QListView{parent} {
 
     setEditTriggers(QAbstractItemView::NoEditTriggers);
     setContextMenuPolicy(Qt::CustomContextMenu);
-    setGridSize(QSize(140, 160));
-    m_gameCard->setSize(gridSize(), 0, 4);
 
     setSpacing(10);
     setWordWrap(true);
@@ -97,8 +95,17 @@ void GameGrid::UpdateIconSize() {
         setUpdatesEnabled(false);
 
         setGridSize(grid_size);
-        m_gameCard->setSize(grid_size, stretched_width - min_item_width, columns);
+        m_gameCard->setSize(grid_size, grid_size, stretched_width - min_item_width, columns);
 
         setUpdatesEnabled(true);
     }
 }
+
+QModelIndex GameGrid::indexAt(const QPoint& point) const {
+    QModelIndex index = QListView::indexAt(point);
+    if (!index.isValid())
+        return {};
+    if (m_gameCard && !m_gameCard->hitTest(point, index, this, visualRect(index)))
+        return {};
+    return index;
+}

src/yuzu/game/game_grid.h

@@ -6,8 +6,6 @@
 #include <QListView>
 #include <QString>
 
-#include "common/common_types.h"
-
 class GameCard;
 class GameListModel;
 
@@ -21,6 +19,8 @@ public:
     void ApplyFilter(const QString& edit_filter_text, GameListModel* model);
     void UpdateIconSize();
 
+    QModelIndex indexAt(const QPoint& point) const override;
+
 private:
     GameCard* m_gameCard = nullptr;
 };

src/yuzu/game/game_list.cpp

@@ -20,6 +20,7 @@
 #include <QScrollerProperties>
 #include <QToolButton>
 #include <QVariantAnimation>
+#include <qlayoutitem.h>
 
 #include "common/common_types.h"
 #include "core/core.h"
@@ -31,6 +32,7 @@
 #include "qt_common/qt_common.h"
 #include "qt_common/util/game.h"
 #include "yuzu/compatibility_list.h"
+#include "yuzu/game/carousel.h"
 #include "yuzu/game/game_grid.h"
 #include "yuzu/game/game_list.h"
 #include "yuzu/game/game_tree.h"
@@ -67,6 +69,9 @@ GameList::GameList(FileSys::VirtualFilesystem vfs_, FileSys::ManualContentProvid
     connect(grid_view, &QListView::activated, this, &GameList::ValidateEntry);
     connect(grid_view, &QListView::customContextMenuRequested, this, &GameList::PopupContextMenu);
 
+    connect(carousel_view, &QListView::activated, this, &GameList::ValidateEntry);
+    connect(carousel_view, &QListView::customContextMenuRequested, this, &GameList::PopupContextMenu);
+
     connect(controller_navigation, &ControllerNavigation::TriggerKeyboardEvent, this,
             [this](Qt::Key key) {
                 if (system.IsPoweredOn()) {
@@ -86,6 +91,7 @@ GameList::GameList(FileSys::VirtualFilesystem vfs_, FileSys::ManualContentProvid
     connect(item_model, &GameListModel::SaveConfig, this, &GameList::SaveConfig);
     connect(item_model, &GameListModel::PopulatingStarted, this, &GameList::OnPopulate);
 
+    // TODO: impl on grid/carousel
     connect(tree_view, &GameTree::FilterResultReady, search_field,
             [this](int visible, int total) { search_field->setFilterResult(visible, total); });
 
@@ -101,12 +107,11 @@ GameList::~GameList() {
 void GameList::SetupViews() {
     tree_view = new GameTree(this);
     grid_view = new GameGrid(this);
+    carousel_view = new GameCarousel(this);
 
     tree_view->SetModel(item_model);
     grid_view->SetModel(item_model);
-
+    carousel_view->SetModel(item_model);
-    layout->addWidget(tree_view);
-    layout->addWidget(grid_view);
 }
 
 QString GameList::GetLastFilterResultItem() const {
@@ -138,10 +143,16 @@ void GameList::LoadCompatibilityList() {
 void GameList::OnPopulate() {
     m_currentView->setEnabled(false);
 
-    if (m_isTreeMode) {
+    switch (game_list_mode) {
-        grid_view->UpdateIconSize();
+    case Settings::GameListMode::TreeView:
-    } else {
         tree_view->UpdateColumnVisibility(item_model);
+        break;
+    case Settings::GameListMode::GridView:
+        grid_view->UpdateIconSize();
+        break;
+    case Settings::GameListMode::CarouselView:
+        carousel_view->UpdateIconSize();
+        break;
     }
 }
 
@@ -166,26 +177,46 @@ void GameList::UnloadController() {
 }
 
 void GameList::ResetViewMode() {
-    auto& setting = UISettings::values.game_list_mode;
+    const auto mode = UISettings::values.game_list_mode.GetValue();
+    game_list_mode = mode;
+
+    if (m_currentView)
+        layout->removeWidget(m_currentView);
+
     bool newTreeMode = false;
 
-    switch (setting.GetValue()) {
+    switch (mode) {
     case Settings::GameListMode::TreeView:
         m_currentView = tree_view;
         newTreeMode = true;
-        tree_view->setVisible(true);
+
-        grid_view->setVisible(false);
         break;
     case Settings::GameListMode::GridView:
         m_currentView = grid_view;
         newTreeMode = false;
-        grid_view->setVisible(true);
+
-        tree_view->setVisible(false);
+        break;
+    case Settings::GameListMode::CarouselView:
+        m_currentView = carousel_view;
+        newTreeMode = false;
+
         break;
     default:
         UNREACHABLE();
     }
 
+    tree_view->setVisible(false);
+    grid_view->setVisible(false);
+    carousel_view->setVisible(false);
+
+    tree_view->setEnabled(false);
+    grid_view->setEnabled(false);
+    carousel_view->setEnabled(false);
+
+    m_currentView->setVisible(true);
+    m_currentView->setEnabled(true);
+    layout->insertWidget(0, m_currentView);
+
     auto view = m_currentView->viewport();
     view->installEventFilter(this);
 
@@ -297,11 +328,13 @@ void GameList::OnPopulatingCompleted(const QStringList& watch_list) {
     for (int i = 1; i < item_model->rowCount() - 1; ++i) {
         children_total += item_model->item(i, 0)->rowCount();
     }
+
     search_field->setFilterResult(children_total, children_total);
     if (children_total > 0) {
         search_field->setFocus();
     }
 
+    // TODO: carousel/grid impl.
     item_model->sort(tree_view->header()->sortIndicatorSection(),
                      tree_view->header()->sortIndicatorOrder());
 
@@ -317,8 +350,15 @@ void GameList::RefreshExternalContent() {
 }
 
 void GameList::UpdateIconSizes() {
-    if (!m_isTreeMode) {
+    switch (game_list_mode) {
+    case Settings::GameListMode::GridView:
         grid_view->UpdateIconSize();
+        break;
+    case Settings::GameListMode::CarouselView:
+        carousel_view->UpdateIconSize();
+        break;
+    case Settings::GameListMode::TreeView:
+        break;
     }
 }
 
@@ -712,6 +752,11 @@ bool GameList::eventFilter(QObject* obj, QEvent* event) {
         return true;
     }
 
+    if (obj == carousel_view->viewport() && event->type() == QEvent::Resize) {
+        carousel_view->UpdateIconSize();
+        return true;
+    }
+
     return QWidget::eventFilter(obj, event);
 }
 

src/yuzu/game/game_list.h

@@ -15,12 +15,12 @@
 #include <QVBoxLayout>
 #include <QVector>
 #include <QWidget>
-#include <qabstractitemview.h>
 
 #include "common/common_types.h"
 #include "core/core.h"
 #include "frontend_common/play_time_manager.h"
 #include "qt_common/config/uisettings.h"
+#include "qt_common/game_list/model.h"
 #include "qt_common/util/game.h"
 #include "yuzu/compatibility_list.h"
 
@@ -38,6 +38,9 @@ class MainWindow;
 enum class AmLaunchType;
 enum class StartGameType;
 
+class GameCarousel;
+
+class QAbstractItemView;
 namespace Core {
 class System;
 }
@@ -151,7 +154,9 @@ private:
 
     GameTree* tree_view = nullptr;
     GameGrid* grid_view = nullptr;
+    GameCarousel* carousel_view = nullptr;
     GameListModel* item_model = nullptr;
+    Settings::GameListMode game_list_mode;
 
     ControllerNavigation* controller_navigation = nullptr;
 

src/yuzu/game/game_tree.h

@@ -3,8 +3,6 @@
 
 #pragma once
 
-#include <QHeaderView>
-#include <QString>
 #include <QTreeView>
 
 class GameListModel;

src/yuzu/main.ui

@@ -45,7 +45,7 @@
      <x>0</x>
      <y>0</y>
      <width>1280</width>
-     <height>22</height>
+     <height>23</height>
     </rect>
    </property>
    <widget class="QMenu" name="menu_File">
@@ -111,6 +111,7 @@
      </property>
      <addaction name="action_Tree_View"/>
      <addaction name="action_Grid_View"/>
+     <addaction name="action_Carousel_View"/>
     </widget>
     <widget class="QMenu" name="menuGame_Icon_Size">
      <property name="title">
@@ -620,6 +621,14 @@
     <string>Show &amp;Performance Overlay</string>
    </property>
   </action>
+  <action name="action_Carousel_View">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>&amp;Carousel View</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="yuzu.qrc"/>

src/yuzu/main_window.cpp

@@ -1529,6 +1529,7 @@ void MainWindow::ConnectMenuEvents() {
 
     connect_menu(ui->action_Grid_View, &MainWindow::SetGridView);
     connect_menu(ui->action_Tree_View, &MainWindow::SetTreeView);
+    connect_menu(ui->action_Carousel_View, &MainWindow::SetCarouselView);
 
     game_size_actions = new QActionGroup(this);
     game_size_actions->setExclusive(true);
@@ -3317,9 +3318,10 @@ void MainWindow::ResetWindowSize1080() {
 void MainWindow::SetGameListMode(Settings::GameListMode mode) {
     ui->action_Grid_View->setChecked(mode == Settings::GameListMode::GridView);
     ui->action_Tree_View->setChecked(mode == Settings::GameListMode::TreeView);
+    ui->action_Carousel_View->setChecked(mode == Settings::GameListMode::CarouselView);
 
     UISettings::values.game_list_mode = mode;
-    ui->action_Show_Game_Name->setEnabled(mode == Settings::GameListMode::GridView);
+    ui->action_Show_Game_Name->setEnabled(mode != Settings::GameListMode::TreeView);
 
     CheckIconSize();
     game_list->ResetViewMode();
@@ -3333,11 +3335,15 @@ void MainWindow::SetTreeView() {
     SetGameListMode(Settings::GameListMode::TreeView);
 }
 
+void MainWindow::SetCarouselView() {
+    SetGameListMode(Settings::GameListMode::CarouselView);
+}
+
 void MainWindow::CheckIconSize() {
-    // When in grid view mode, with text off
+    // When in grid/carousel view mode, with text off
-    // there is no point in having icons turned off..
+    // there is no point in having icons turned off
     auto actions = game_size_actions->actions();
-    if (UISettings::values.game_list_mode.GetValue() == Settings::GameListMode::GridView &&
+    if (UISettings::values.game_list_mode.GetValue() != Settings::GameListMode::TreeView &&
         !UISettings::values.show_game_name.GetValue()) {
         u32 newSize = UISettings::values.game_icon_size.GetValue();
         if (newSize == 0) {

src/yuzu/main_window.h

@@ -410,6 +410,7 @@ private slots:
     void SetGameListMode(Settings::GameListMode mode);
     void SetGridView();
     void SetTreeView();
+    void SetCarouselView();
 
     void CheckIconSize();
     void ToggleShowGameName();