Add cheats in per game configuration (#6379)

src/citra_qt/configuration/configure_cheats.h

@@ -0,0 +1,61 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "common/common_types.h"
+
+namespace Cheats {
+class CheatBase;
+class CheatEngine;
+} // namespace Cheats
+
+namespace Ui {
+class ConfigureCheats;
+} // namespace Ui
+
+class ConfigureCheats : public QWidget {
+    Q_OBJECT
+
+public:
+    explicit ConfigureCheats(u64 title_id_, QWidget* parent = nullptr);
+    ~ConfigureCheats();
+    bool ApplyConfiguration();
+
+private:
+    /**
+     * Loads the cheats from the CheatEngine, and populates the table.
+     */
+    void LoadCheats();
+
+    /**
+     * Pops up a message box asking if the user wants to save the current cheat.
+     * If the user selected Yes, attempts to save the current cheat.
+     * @return true if the user selected No, or if the cheat was saved successfully
+     *         false if the user selected Cancel, or if the user selected Yes but saving failed
+     */
+    bool CheckSaveCheat();
+
+    /**
+     * Saves the current cheat as the row-th cheat in the cheat list.
+     * @return true if the cheat is saved successfully, false otherwise
+     */
+    bool SaveCheat(int row);
+
+private slots:
+    void OnRowSelected(int row, int column);
+    void OnCheckChanged(int state);
+    void OnTextEdited();
+    void OnDeleteCheat();
+    void OnAddCheat();
+
+private:
+    std::unique_ptr<Ui::ConfigureCheats> ui;
+    std::vector<std::shared_ptr<Cheats::CheatBase>> cheats;
+    bool edited = false, newly_created = false;
+    int last_row = -1, last_col = -1;
+    u64 title_id;
+    std::unique_ptr<Cheats::CheatEngine> cheat_engine;
+};