[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>

1 files changed, 107 insertions, 0 deletions

diff --git a/src/yuzu/game/carousel.cpp b/src/yuzu/game/carousel.cpp
new file mode 100644
index 0000000000..ac9c9947b5
--- /dev/null
+++ b/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;
+}