qt: Implement GUI dialog frontend for ProfileSelector

Presents profiles in a list, similar to switch.

src/yuzu/applets/profile_select.h

@@ -0,0 +1,73 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include <QDialog>
+#include <QList>
+#include "core/frontend/applets/profile_select.h"
+
+class GMainWindow;
+class QDialogButtonBox;
+class QGraphicsScene;
+class QLabel;
+class QScrollArea;
+class QStandardItem;
+class QStandardItemModel;
+class QTreeView;
+class QVBoxLayout;
+
+class QtProfileSelectionDialog final : public QDialog {
+    Q_OBJECT
+
+public:
+    QtProfileSelectionDialog(QWidget* parent);
+    ~QtProfileSelectionDialog() override;
+
+    void accept() override;
+    void reject() override;
+
+    bool GetStatus() const;
+    u32 GetIndex() const;
+
+private:
+    bool ok = false;
+    u32 user_index = 0;
+
+    void SelectUser(const QModelIndex& index);
+
+    QVBoxLayout* layout;
+    QTreeView* tree_view;
+    QStandardItemModel* item_model;
+    QGraphicsScene* scene;
+
+    std::vector<QList<QStandardItem*>> list_items;
+
+    QVBoxLayout* outer_layout;
+    QLabel* instruction_label;
+    QScrollArea* scroll_area;
+    QDialogButtonBox* buttons;
+
+    std::unique_ptr<Service::Account::ProfileManager> profile_manager;
+};
+
+class QtProfileSelector final : public QObject, public Core::Frontend::ProfileSelectApplet {
+    Q_OBJECT
+
+public:
+    explicit QtProfileSelector(GMainWindow& parent);
+    ~QtProfileSelector() override;
+
+    void SelectProfile(
+        std::function<void(std::optional<Service::Account::UUID>)> callback) const override;
+
+signals:
+    void MainWindowSelectProfile() const;
+
+private:
+    void MainWindowFinishedSelection(std::optional<Service::Account::UUID> uuid);
+
+    mutable std::function<void(std::optional<Service::Account::UUID>)> callback;
+};