[desktop] Add mod importer from folder and zip (#3472)

Closes #3125

Adds buttons to the addons page that imports a mod (or mods) from zip or folder.

Currently known to work with mods that provide proper romfs/exefs things, unsure about cheats and such. Also works on mods that just stuff things into the root of the zip.

TODO:
- [ ] test folder more thoroughly
- [ ] cheats
- [ ] test all sorts of mod pack types

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3472
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/yuzu/configuration/addon/mod_select_dialog.cpp b/src/yuzu/configuration/addon/mod_select_dialog.cpp
new file mode 100644
index 0000000000..e6c361b94f
--- /dev/null
+++ b/src/yuzu/configuration/addon/mod_select_dialog.cpp
@@ -0,0 +1,66 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <QFileInfo>
+#include <qnamespace.h>
+#include "mod_select_dialog.h"
+#include "ui_mod_select_dialog.h"
+
+ModSelectDialog::ModSelectDialog(const QStringList& mods, QWidget* parent)
+    : QDialog(parent), ui(new Ui::ModSelectDialog) {
+    ui->setupUi(this);
+
+    item_model = new QStandardItemModel(ui->treeView);
+    ui->treeView->setModel(item_model);
+
+    // We must register all custom types with the Qt Automoc system so that we are able to use it
+    // with signals/slots. In this case, QList falls under the umbrella of custom types.
+    qRegisterMetaType<QList<QStandardItem*>>("QList<QStandardItem*>");
+
+    for (const auto& mod : mods) {
+        const auto basename = QFileInfo(mod).fileName();
+
+        auto* const first_item = new QStandardItem;
+        first_item->setText(basename);
+        first_item->setData(mod);
+
+        first_item->setCheckable(true);
+        first_item->setCheckState(Qt::Checked);
+
+        item_model->appendRow(first_item);
+    }
+
+    ui->treeView->expandAll();
+    ui->treeView->resizeColumnToContents(0);
+
+    int rows = item_model->rowCount();
+    int height =
+        ui->treeView->contentsMargins().top() * 4 + ui->treeView->contentsMargins().bottom() * 4;
+    int width = 0;
+
+    for (int i = 0; i < rows; ++i) {
+        height += ui->treeView->sizeHintForRow(i);
+        width = qMax(width, item_model->item(i)->sizeHint().width());
+    }
+
+    width += ui->treeView->contentsMargins().left() * 4 + ui->treeView->contentsMargins().right() * 4;
+    ui->treeView->setMinimumHeight(qMin(height, 600));
+    ui->treeView->setMinimumWidth(qMin(width, 700));
+    adjustSize();
+
+    connect(this, &QDialog::accepted, this, [this]() {
+        QStringList selected_mods;
+
+        for (qsizetype i = 0; i < item_model->rowCount(); ++i) {
+            auto* const item = item_model->item(i);
+            if (item->checkState() == Qt::Checked)
+                selected_mods << item->data().toString();
+        }
+
+        emit modsSelected(selected_mods);
+    });
+}
+
+ModSelectDialog::~ModSelectDialog() {
+    delete ui;
+}