Further work on support for cheats

Cheats can now be enabled/disabled and games can be launched with cheats

arm9/gfx/cheatSelector.grit

@@ -0,0 +1,7 @@
+# tile format
+-gt
+
+# graphics bit depth is 4 (16 color)
+-gB4
+
+-p!

arm9/source/cheats/Cheat.h

@@ -7,22 +7,34 @@ public:
     Cheat()
         : _cheatData(nullptr), _cheatDataLength(0) { }
 
-    Cheat(const char* name, const char* description, bool isCheatActive, const void* cheatData, u32 cheatDataLength)
-        : CheatTreeItem(name, description), _isCheatActive(isCheatActive)
+    Cheat(const char* name, const char* description, u32* flagsPointer, const void* cheatData, u32 cheatDataLength)
+        : CheatTreeItem(name, description), _flagsPointer(flagsPointer)
         , _cheatData(cheatData), _cheatDataLength(cheatDataLength) { }
 
+    const void* GetCheatData(u32& cheatDataLength) const
+    {
+        cheatDataLength = _cheatDataLength;
+        return _cheatData;
+    }
+
     bool GetIsCheatActive() const
     {
-        return _isCheatActive;
+        return ((*_flagsPointer >> 24) & 1) == 1;
     }
 
-    void SetIsCheatActive(bool isCheatActive)
+    void SetIsCheatActive(bool isCheatActive) const
     {
-        _isCheatActive = isCheatActive;
+        u32 flags = *_flagsPointer;
+        flags &= ~(1 << 24);
+        if (isCheatActive)
+        {
+            flags |= 1 << 24;
+        }
+        *_flagsPointer = flags;
     }
 
 private:
-    bool _isCheatActive;
+    u32* _flagsPointer;
     const void* _cheatData;
     u32 _cheatDataLength;
 };

arm9/source/cheats/CheatCategory.h

@@ -2,8 +2,9 @@
 #include <memory>
 #include "CheatTreeItem.h"
 #include "Cheat.h"
+#include "ICheatCategory.h"
 
-class CheatCategory : public CheatTreeItem
+class CheatCategory : public CheatTreeItem, public ICheatCategory
 {
 public:
     CheatCategory()
@@ -55,18 +56,18 @@ public:
         }
     }
 
-    bool GetIsMaxOneCheatActive() const
+    bool GetIsMaxOneCheatActive() const override
     {
         return _isMaxOneCheatActive;
     }
 
-    const CheatCategory* GetSubCategories(u32& numberOfSubCategories) const
+    const CheatCategory* GetCategories(u32& numberOfCategories) const override
     {
-        numberOfSubCategories = _numberOfSubCategories;
+        numberOfCategories = _numberOfSubCategories;
         return _subCategories;
     }
 
-    const Cheat* GetCheats(u32& numberOfCheats) const
+    const Cheat* GetCheats(u32& numberOfCheats) const override
     {
         numberOfCheats = _numberOfCheats;
         return _cheats;

arm9/source/cheats/GameCheats.h

@@ -1,13 +1,14 @@
 #pragma once
 #include "Cheat.h"
 #include "CheatCategory.h"
+#include "ICheatCategory.h"
 
-class GameCheats
+class GameCheats : public ICheatCategory
 {
 public:
-    GameCheats(std::unique_ptr<u8[]> cheatData, const char* gameName,
+    GameCheats(std::unique_ptr<u8[]> cheatData, u32 cheatDataLength, u32 fileOffset, const char* gameName,
         CheatCategory* categories, u32 numberOfCategories, Cheat* cheats, u32 numberOfCheats)
-        : _cheatData(std::move(cheatData)), _gameName(gameName)
+        : _cheatData(std::move(cheatData)), _cheatDataLength(cheatDataLength), _fileOffset(fileOffset), _gameName(gameName)
         , _categories(categories), _numberOfCategories(numberOfCategories)
         , _cheats(cheats), _numberOfCheats(numberOfCheats) { }
 
@@ -28,20 +29,38 @@ public:
         return _gameName;
     }
 
-    const CheatCategory* GetCheatCategories(u32& numberOfCategories) const
+    bool GetIsMaxOneCheatActive() const override
+    {
+        return false;
+    }
+
+    const CheatCategory* GetCategories(u32& numberOfCategories) const override
     {
         numberOfCategories = _numberOfCategories;
         return _categories;
     }
 
-    const Cheat* GetCheats(u32& numberOfCheats) const
+    const Cheat* GetCheats(u32& numberOfCheats) const override
     {
         numberOfCheats = _numberOfCheats;
         return _cheats;
     }
 
+    u8* GetCheatData(u32& cheatDataLength) const
+    {
+        cheatDataLength = _cheatDataLength;
+        return _cheatData.get();
+    }
+
+    u32 GetFileOffset() const
+    {
+        return _fileOffset;
+    }
+
 private:
     std::unique_ptr<u8[]> _cheatData;
+    u32 _cheatDataLength;
+    u32 _fileOffset;
     const char* _gameName;
     CheatCategory* _categories;
     u32 _numberOfCategories;

arm9/source/cheats/ICheatCategory.h

@@ -0,0 +1,17 @@
+#pragma once
+
+class CheatCategory;
+class Cheat;
+
+class ICheatCategory
+{
+public:
+    virtual ~ICheatCategory() = default;
+
+    virtual bool GetIsMaxOneCheatActive() const = 0;
+    virtual const CheatCategory* GetCategories(u32& numberOfCategories) const;
+    virtual const Cheat* GetCheats(u32& numberOfCheats) const;
+
+protected:
+    ICheatCategory() = default;
+};

arm9/source/cheats/ICheatRepository.h

@@ -1,12 +1,14 @@
 #pragma once
 #include "GameCheats.h"
+#include "fat/FastFileRef.h"
 
 class ICheatRepository
 {
 public:
     virtual ~ICheatRepository() { }
 
-    virtual std::unique_ptr<GameCheats> GetCheatsForGame(u32 gameCode, u32 headerCrc32) const = 0;
+    virtual std::unique_ptr<GameCheats> GetCheatsForGame(const FastFileRef& romFile) const = 0;
+    virtual void UpdateEnabledCheatsForGame(const std::unique_ptr<GameCheats>& cheats) const = 0;
 
 protected:
     ICheatRepository() { }

arm9/source/cheats/PicoLoaderCheatDataFactory.cpp

@@ -0,0 +1,99 @@
+#include "common.h"
+#include <string.h>
+#include "PicoLoaderCheatDataFactory.h"
+
+pload_cheats_t* PicoLoaderCheatDataFactory::CreateCheatData(const std::unique_ptr<GameCheats>& gameCheats) const
+{
+    pload_cheats_t* cheatData = nullptr;
+    if (gameCheats)
+    {
+        u32 totalNumberOfCheats = 0;
+        u32 requiredSize = GetCheatCategoryRequiredSize(gameCheats.get(), totalNumberOfCheats);
+        if (totalNumberOfCheats != 0)
+        {
+            requiredSize += sizeof(u32) * 2;
+            cheatData = (pload_cheats_t*)new u8[requiredSize];
+            cheatData->length = requiredSize;
+            cheatData->numberOfCheats = totalNumberOfCheats;
+            u8* buffer = (u8*)&cheatData->firstCheat;
+            GetCheatCategoryData(gameCheats.get(), buffer);
+        }
+    }
+
+    return cheatData;
+}
+
+u32 PicoLoaderCheatDataFactory::GetCheatCategoryRequiredSize(const ICheatCategory* cheatCategory, u32& totalNumberOfCheats) const
+{
+    u32 requiredSize = 0;
+
+    u32 numberOfCategories = 0;
+    auto subCategories = cheatCategory->GetCategories(numberOfCategories);
+    for (u32 i = 0; i < numberOfCategories; i++)
+    {
+        requiredSize += GetCheatCategoryRequiredSize(&subCategories[i], totalNumberOfCheats);
+    }
+
+    u32 numberOfCheats = 0;
+    auto cheats = cheatCategory->GetCheats(numberOfCheats);
+    for (u32 i = 0; i < numberOfCheats; i++)
+    {
+        u32 cheatRequiredSize = GetCheatRequiredSize(&cheats[i]);
+        if (cheatRequiredSize != 0)
+        {
+            requiredSize += cheatRequiredSize;
+            totalNumberOfCheats++;
+        }
+    }
+
+    return requiredSize;
+}
+
+u32 PicoLoaderCheatDataFactory::GetCheatRequiredSize(const Cheat* cheat) const
+{
+    if (cheat->GetIsCheatActive())
+    {
+        u32 cheatDataLength = 0;
+        cheat->GetCheatData(cheatDataLength);
+        return sizeof(u32) + ((cheatDataLength + 7) & ~7);
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+void PicoLoaderCheatDataFactory::GetCheatCategoryData(const ICheatCategory* cheatCategory, u8*& buffer) const
+{
+    u32 numberOfCategories = 0;
+    auto subCategories = cheatCategory->GetCategories(numberOfCategories);
+    for (u32 i = 0; i < numberOfCategories; i++)
+    {
+        GetCheatCategoryData(&subCategories[i], buffer);
+    }
+
+    u32 numberOfCheats = 0;
+    auto cheats = cheatCategory->GetCheats(numberOfCheats);
+    for (u32 i = 0; i < numberOfCheats; i++)
+    {
+        GetCheatData(&cheats[i], buffer);
+    }
+}
+
+void PicoLoaderCheatDataFactory::GetCheatData(const Cheat* cheat, u8*& buffer) const
+{
+    if (cheat->GetIsCheatActive())
+    {
+        u32 cheatDataLength = 0;
+        auto cheatData = cheat->GetCheatData(cheatDataLength);
+        u32 paddedCheatDataLength = (cheatDataLength + 7) & ~7;
+        *(u32*)buffer = paddedCheatDataLength;
+        buffer += sizeof(u32);
+        memcpy(buffer, cheatData, cheatDataLength);
+        if (cheatDataLength != paddedCheatDataLength)
+        {
+            memset(buffer + cheatDataLength, 0, paddedCheatDataLength - cheatDataLength);
+        }
+        buffer += paddedCheatDataLength;
+    }
+}

arm9/source/cheats/PicoLoaderCheatDataFactory.h

@@ -0,0 +1,16 @@
+#pragma once
+#include <memory>
+#include "GameCheats.h"
+#include "picoLoader7.h"
+
+class PicoLoaderCheatDataFactory
+{
+public:
+    pload_cheats_t* CreateCheatData(const std::unique_ptr<GameCheats>& gameCheats) const;
+
+private:
+    u32 GetCheatCategoryRequiredSize(const ICheatCategory* cheatCategory, u32& totalNumberOfCheats) const;
+    u32 GetCheatRequiredSize(const Cheat* cheat) const;
+    void GetCheatCategoryData(const ICheatCategory* cheatCategory, u8*& buffer) const;
+    void GetCheatData(const Cheat* cheat, u8*& buffer) const;
+};

arm9/source/cheats/UsrCheatRepository.cpp

@@ -3,6 +3,68 @@
 #include <string.h>
 #include "UsrCheatRepository.h"
 
+#define CRCPOLY 0xEDB88320
+
+static u32 crc32(const void* buffer, u32 length)
+{
+    u32 crc = ~0u;
+    const u8* p = (u8*)buffer;
+    while (length--)
+    {
+        crc ^= *p++;
+        for (int i = 0; i < 8; i++)
+        {
+            crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY : 0);
+        }
+    }
+
+    return crc;
+}
+
+std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(const FastFileRef& romFile) const
+{
+    auto file = std::make_unique<File>();
+    file->Open(romFile, FA_READ);
+    auto headerBuffer = std::make_unique_for_overwrite<u8[]>(512);
+    if (!file->ReadExact(headerBuffer.get(), 512))
+    {
+        LOG_ERROR("Could not read rom header\n");
+        return nullptr;
+    }
+    file->Close();
+
+    u32 gameCode = *(u32*)(headerBuffer.get() + 0xC);
+    u32 crc = crc32(headerBuffer.get(), 512);
+
+    headerBuffer.reset();
+
+    return GetCheatsForGame(gameCode, crc);
+}
+
+void UsrCheatRepository::UpdateEnabledCheatsForGame(const std::unique_ptr<GameCheats>& cheats) const
+{
+    u32 cheatDataLength = 0;
+    auto cheatData = cheats->GetCheatData(cheatDataLength);
+    if (_usrCheatFile->Seek(cheats->GetFileOffset()) != FR_OK)
+    {
+        LOG_ERROR("Failed to seek to cheat data\n");
+        return;
+    }
+
+    u32 bytesWritten = 0;
+    if (_usrCheatFile->Write(cheatData, cheatDataLength, bytesWritten) != FR_OK ||
+        bytesWritten != cheatDataLength)
+    {
+        LOG_ERROR("Failed to write cheat data\n");
+        return;
+    }
+
+    if (_usrCheatFile->Sync() != FR_OK)
+    {
+        LOG_ERROR("Failed to flush cheat data\n");
+    }
+}
+
 std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u32 headerCrc32) const
 {
     auto index = FindIndex(gameCode, headerCrc32);
@@ -14,13 +76,14 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
         return nullptr;
     }
 
-    auto cheatData = std::make_unique_for_overwrite<u8[]>(index->padding); // padding was set to the size in UsrCheatRepositoryFactory
+    const u32 cheatDataLength = index->padding; // padding was set to the size in UsrCheatRepositoryFactory
+    auto cheatData = std::make_unique_for_overwrite<u8[]>(cheatDataLength);
     if (_usrCheatFile->Seek(index->offset) != FR_OK)
     {
         LOG_ERROR("Failed to seek to cheat data\n");
         return nullptr;
     }
-    if (!_usrCheatFile->ReadExact(cheatData.get(), index->padding))
+    if (!_usrCheatFile->ReadExact(cheatData.get(), cheatDataLength))
     {
         LOG_ERROR("Failed to read cheat data\n");
         return nullptr;
@@ -38,7 +101,7 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
     // flags
     u32 flags = *(u32*)ptr;
     u32 totalNumberOfItems = flags & 0x0FFFFFFF;
-    u32 gameActive = flags >> 28;
+    // u32 gameActive = flags >> 28;
     ptr += 4;
 
     // master codes
@@ -50,7 +113,7 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
     auto cheats = (Cheat*)malloc(totalNumberOfItems * sizeof(Cheat));
     u32 cheatCount = 0;
 
-    while (ptr < cheatData.get() + index->padding)
+    while (ptr < cheatData.get() + cheatDataLength)
     {
         u32 itemFlags = *(u32*)ptr;
         bool isCategory = ((itemFlags >> 28) & 1) == 1;
@@ -69,7 +132,8 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
     categories = (CheatCategory*)realloc(categories, categoryCount * sizeof(CheatCategory));
     cheats = (Cheat*)realloc(cheats, cheatCount * sizeof(Cheat));
 
-    return std::make_unique<GameCheats>(std::move(cheatData), gameName, categories, categoryCount, cheats, cheatCount);
+    return std::make_unique<GameCheats>(
+        std::move(cheatData), cheatDataLength, index->offset, gameName, categories, categoryCount, cheats, cheatCount);
 }
 
 const usr_cheat_index_entry_t* UsrCheatRepository::FindIndex(u32 gameCode, u32 headerCrc32) const
@@ -142,15 +206,14 @@ void UsrCheatRepository::ParseCategory(CheatCategory& category, u8*& ptr) const
     categories = (CheatCategory*)realloc(categories, categoryCount * sizeof(CheatCategory));
     cheats = (Cheat*)realloc(cheats, cheatCount * sizeof(Cheat));
 
-    category = CheatCategory(itemName, itemDescription, isMaxOneCheatActive, categories, categoryCount, cheats, cheatCount);
+    new (&category) CheatCategory (itemName, itemDescription, isMaxOneCheatActive, categories, categoryCount, cheats, cheatCount);
 }
 
 void UsrCheatRepository::ParseCheat(Cheat& cheat, u8*& ptr) const
 {
     // flags
-    u32 itemFlags = *(u32*)ptr;
+    u32* flagsPtr = (u32*)ptr;
     ptr += 4;
-    bool isCheatActive = ((itemFlags >> 24) & 1) == 1;
 
     // item name
     const char* itemName = (const char*)ptr;
@@ -167,7 +230,7 @@ void UsrCheatRepository::ParseCheat(Cheat& cheat, u8*& ptr) const
     u32 numberOfCodeWords = *(u32*)ptr;
     ptr += 4;
 
-    cheat = Cheat(itemName, itemDescription, isCheatActive, ptr, numberOfCodeWords * 4);
+    new (&cheat) Cheat(itemName, itemDescription, flagsPtr, ptr, numberOfCodeWords * 4);
 
     // code
     ptr += numberOfCodeWords * 4;

arm9/source/cheats/UsrCheatRepository.h

@@ -12,13 +12,15 @@ public:
         : _usrCheatFile(std::move(usrCheatDatFile))
         , _sortedIndices(std::move(sortedIndices)), _numberOfIndices(numberOfIndices) { }
 
-    std::unique_ptr<GameCheats> GetCheatsForGame(u32 gameCode, u32 headerCrc32) const override;
+    std::unique_ptr<GameCheats> GetCheatsForGame(const FastFileRef& romFile) const override;
+    void UpdateEnabledCheatsForGame(const std::unique_ptr<GameCheats>& cheats) const override;
 
 private:
     std::unique_ptr<File> _usrCheatFile;
     std::unique_ptr<usr_cheat_index_entry_t[]> _sortedIndices;
     u32 _numberOfIndices;
 
+    std::unique_ptr<GameCheats> GetCheatsForGame(u32 gameCode, u32 headerCrc32) const;
     const usr_cheat_index_entry_t* FindIndex(u32 gameCode, u32 headerCrc32) const;
     void ParseCategory(CheatCategory& category, u8*& ptr) const;
     void ParseCheat(Cheat& cheat, u8*& ptr) const;

arm9/source/core/task/Task.h

@@ -65,7 +65,7 @@ template <>
 class Task<void> : public TaskBase
 {
 protected:
-    virtual TaskResult<void> ExecuteFunc() const = 0;
+    virtual TaskResult<void> ExecuteFunc() = 0;
 
 private:
     TaskState ExecuteDirect() override
@@ -79,11 +79,11 @@ template <class T, typename FuncType>
 class FuncTask : public Task<T>
 {
 public:
-    FuncTask(const FuncType& function)
-        : _function(function) { }
+    FuncTask(FuncType&& function)
+        : _function(std::move(function)) { }
 
 private:
-    const FuncType _function;
+    FuncType _function;
 
-    TaskResult<T> ExecuteFunc() const override { return _function((const volatile u8&)this->_cancelRequested); }
+    TaskResult<T> ExecuteFunc() override { return _function((const volatile u8&)this->_cancelRequested); }
 };

arm9/source/core/task/TaskQueue.h

@@ -79,12 +79,12 @@ public:
 
     template <typename FuncType>
     [[gnu::noinline]]
-    auto Enqueue(const FuncType& function) -> QueueTask<decltype(TaskResultToResultType(function(*new vu8())))>
+    auto Enqueue(FuncType&& function) -> QueueTask<decltype(TaskResultToResultType(function(*new vu8())))>
     {
         using TaskType = FuncTask<decltype(TaskResultToResultType(function(*new vu8()))), FuncType>;
         // static_assert(sizeof(TaskType) <= MaxTaskSize, "Task is too big for this pool");
         void* slot = GetSlot();
-        auto task = new (slot) TaskType(function);
+        auto task = new (slot) TaskType(std::move(function));
         Enqueue(task);
         return QueueTask(task, this);
     }

arm9/source/gui/AdvancedPaletteManager.h

@@ -84,6 +84,7 @@ public:
 
     u32 AllocRow(const IPalette& palette, int yStart, int yEnd) override
     {
+        yEnd++; // avoid back to back allocation
         return AllocRowInternal(_rows[_curSet], palette, yStart, yEnd);
     }
 

arm9/source/gui/views/RecyclerView.cpp

@@ -39,6 +39,10 @@ void RecyclerView::SetAdapter(const RecyclerAdapter* adapter, int initialSelecte
         _viewPool.reset();
         _viewPoolFreeCount = 0;
         _viewPoolTotalCount = 0;
+        _xOffset = 0;
+        _yOffset = 0;
+        _curRangeStart = 0;
+        _curRangeLength = 0;
     }
     _adapter = adapter;
     _adapter->GetViewSize(_itemWidth, _itemHeight);

arm9/source/picoLoaderBootstrap.cpp

@@ -21,6 +21,7 @@ typedef void (*pico_loader_9_func_t)(void);
 static pload_params_t sLoadParams;
 static char sLauncherPath[256] alignas(32);
 static PicoLoaderBootDrive sBootDrive;
+static const pload_cheats_t* sCheatData = nullptr;
 
 pload_params_t* pload_getLoadParams()
 {
@@ -37,6 +38,11 @@ void pload_setLauncherPath(const char* launcherPath)
     StringUtil::Copy(sLauncherPath, launcherPath, sizeof(sLauncherPath));
 }
 
+void pload_setCheatData(const pload_cheats_t* cheatData)
+{
+    sCheatData = cheatData;
+}
+
 void pload_start()
 {
     mem_setVramAMapping(MEM_VRAM_AB_LCDC);
@@ -92,6 +98,10 @@ void pload_start()
     {
         dma_ntrCopy16(3, &sLauncherPath, &header->v2.launcherPath, sizeof(header->v2.launcherPath));
     }
+    if (header->apiVersion >= 3)
+    {
+        header->v3.cheats = sCheatData;
+    }
     mem_setVramCMapping(MEM_VRAM_C_ARM7_00000);
     mem_setVramDMapping(MEM_VRAM_D_ARM7_20000);
     ipc_sendFifoMessage(IPC_CHANNEL_LOADER, 1);

arm9/source/picoLoaderBootstrap.h

@@ -4,4 +4,5 @@
 pload_params_t* pload_getLoadParams();
 void pload_setBootDrive(PicoLoaderBootDrive bootDrive);
 void pload_setLauncherPath(const char* launcherPath);
+void pload_setCheatData(const pload_cheats_t* cheatData);
 void pload_start();

arm9/source/romBrowser/RomBrowserController.cpp

@@ -7,6 +7,7 @@
 #include "SdFolderFactory.h"
 #include "services/settings/IAppSettingsService.h"
 #include "cheats/UsrCheatRepositoryFactory.h"
+#include "cheats/PicoLoaderCheatDataFactory.h"
 #include "RomBrowserController.h"
 
 RomBrowserController::RomBrowserController(
@@ -182,15 +183,35 @@ void RomBrowserController::HandleLaunchTrigger()
 {
     LOG_DEBUG("RomBrowserStateTrigger::Launch\n");
     _ioTaskQueue->Enqueue([this] (const vu8& cancelRequested)
+    {
+        UpdateLastUsedFilepath();
+        SetPicoLoaderParams();
+        LoadCheats();
+        return TaskResult<void>::Completed();
+    });
+}
+
+void RomBrowserController::HandleChangeDisplayModeTrigger()
+{
+    LOG_DEBUG("RomBrowserStateTrigger::ChangeDisplayMode\n");
+    _romBrowserViewModel = SharedPtr(new RomBrowserViewModel(this));
+}
+
+void RomBrowserController::UpdateLastUsedFilepath()
 {
     f_getcwd(_navigatePath, sizeof(_navigatePath) / sizeof(_navigatePath[0]));
     int idx = strlcat(_navigatePath, "/", sizeof(_navigatePath));
     if (_navigatePath[idx - 2] == '/')
+    {
         _navigatePath[idx - 1] = 0;
+    }
     strlcat(_navigatePath, _triggerFileInfo.GetFileName(), sizeof(_navigatePath));
     _appSettingsService->GetAppSettings().lastUsedFilePath = _navigatePath;
     _appSettingsService->Save();
+}
 
+void RomBrowserController::SetPicoLoaderParams() const
+{
     auto loadParams = pload_getLoadParams();
     loadParams->savePath[0] = 0;
     loadParams->arguments[0] = 0;
@@ -203,12 +224,11 @@ void RomBrowserController::HandleLaunchTrigger()
     {
         LOG_FATAL("Failed to set launch parameters.\n");
     }
-        return TaskResult<void>::Completed();
-    });
 }
 
-void RomBrowserController::HandleChangeDisplayModeTrigger()
+void RomBrowserController::LoadCheats() const
 {
-    LOG_DEBUG("RomBrowserStateTrigger::ChangeDisplayMode\n");
-    _romBrowserViewModel = SharedPtr(new RomBrowserViewModel(this));
+    auto cheats = _cheatRepository->GetCheatsForGame(_triggerFileInfo.GetFastFileRef());
+    auto cheatData = PicoLoaderCheatDataFactory().CreateCheatData(cheats);
+    pload_setCheatData(cheatData);
 }

arm9/source/romBrowser/RomBrowserController.h

@@ -74,4 +74,7 @@ private:
     void HandleFolderLoadDoneTrigger();
     void HandleLaunchTrigger();
     void HandleChangeDisplayModeTrigger();
+    void UpdateLastUsedFilepath();
+    void SetPicoLoaderParams() const;
+    void LoadCheats() const;
 };

arm9/source/romBrowser/viewModels/CheatsViewModel.cpp

@@ -3,57 +3,16 @@
 #include "fat/File.h"
 #include "CheatsViewModel.h"
 
-#define CRCPOLY 0xEDB88320
-
-static u32 crc32(const void* buffer, u32 length)
-{
-    u32 crc = ~0u;
-    const u8* p = (u8*)buffer;
-    while (length--)
-    {
-        crc ^= *p++;
-        for (int i = 0; i < 8; i++)
-        {
-            crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY : 0);
-        }
-    }
-
-    return crc;
-}
-
 CheatsViewModel::CheatsViewModel(const FileInfo& romFileInfo, IRomBrowserController* romBrowserController)
     : _romFileInfo(romFileInfo), _romBrowserController(romBrowserController)
 {
+    _categoryStack.fill(nullptr);
     _loadCheatsTask = _romBrowserController->GetIoTaskQueue()->Enqueue([this] (const vu8& cancelRequested)
     {
-        LOG_DEBUG("%s\n", _romFileInfo.GetFileName());
-        auto file = std::make_unique<File>();
-        file->Open(_romFileInfo.GetFastFileRef(), FA_READ);
-        auto headerBuffer = std::make_unique_for_overwrite<u8[]>(512);
-        if (!file->ReadExact(headerBuffer.get(), 512))
-        {
-            LOG_ERROR("Could not read rom header\n");
-            return TaskResult<void>::Failed();
-        }
-        file->Close();
-
-        if (cancelRequested)
-        {
-            return TaskResult<void>::Canceled();
-        }
-
-        u32 gameCode = *(u32*)(headerBuffer.get() + 0xC);
-        u32 crc = crc32(headerBuffer.get(), 512);
-        headerBuffer.reset();
-
-        if (cancelRequested)
-        {
-            return TaskResult<void>::Canceled();
-        }
-
-        _cheats = _romBrowserController->GetCheatRepository().GetCheatsForGame(gameCode, crc);
+        _cheats = _romBrowserController->GetCheatRepository().GetCheatsForGame(_romFileInfo.GetFastFileRef());
         if (_cheats)
         {
+            _categoryStack[0] = _cheats.get();
             _state = State::DisplayCheats;
         }
         else
@@ -64,3 +23,64 @@ CheatsViewModel::CheatsViewModel(const FileInfo& romFileInfo, IRomBrowserControl
         return TaskResult<void>::Completed();
     });
 }
+
+void CheatsViewModel::ItemActivated()
+{
+    auto cheatCategory = GetCurrentCheatCategory();
+    u32 numberOfCategories = 0;
+    auto categories = cheatCategory->GetCategories(numberOfCategories);
+    u32 numberOfCheats = 0;
+    auto cheats = cheatCategory->GetCheats(numberOfCheats);
+
+    if (_selectedItem < (int)numberOfCategories)
+    {
+        // Category activated
+        if (_categoryStackLevel + 1 != _categoryStack.size())
+        {
+            _categoryStack[++_categoryStackLevel] = &categories[_selectedItem];
+        }
+    }
+    else
+    {
+        // Toggle cheat on/off
+        auto& cheat = cheats[_selectedItem - numberOfCategories];
+        bool isEnabled = !cheat.GetIsCheatActive();
+        if (isEnabled && cheatCategory->GetIsMaxOneCheatActive())
+        {
+            for (u32 i = 0; i < numberOfCheats; i++)
+            {
+                cheats[i].SetIsCheatActive(false);
+            }
+        }
+        cheat.SetIsCheatActive(isEnabled);
+        _changed = true;
+    }
+}
+
+void CheatsViewModel::Back()
+{
+    if (_categoryStackLevel == 0)
+    {
+        Close();
+    }
+    else
+    {
+        _categoryStack[_categoryStackLevel--] = nullptr;
+    }
+}
+
+void CheatsViewModel::Close()
+{
+    if (_changed)
+    {
+        // Save which cheats are enabled/disabled
+        _romBrowserController->GetIoTaskQueue()->Enqueue(
+            [romBrowserController = _romBrowserController, cheats = move(_cheats)] (const vu8& cancelRequested)
+            {
+                romBrowserController->GetCheatRepository().UpdateEnabledCheatsForGame(cheats);
+                return TaskResult<void>::Completed();
+            });
+    }
+
+    _romBrowserController->HideGameInfo();
+}

arm9/source/romBrowser/viewModels/CheatsViewModel.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <array>
 #include <memory>
 #include "core/task/TaskQueue.h"
 #include "cheats/GameCheats.h"
@@ -18,13 +19,15 @@ public:
 
     CheatsViewModel(const FileInfo& romFileInfo, IRomBrowserController* romBrowserController);
 
-    void Close()
-    {
-        _romBrowserController->HideGameInfo();
-    }
+    void ItemActivated();
+    void Back();
+    void Close();
 
     State GetState() const { return _state; }
-    const GameCheats* GetCheats() const { return _cheats.get(); }
+    const ICheatCategory* GetCurrentCheatCategory() const { return _categoryStack[_categoryStackLevel]; }
+
+    constexpr int GetSelectedItem() const { return _selectedItem; }
+    void SetSelectedItem(int selectedItem) { _selectedItem = selectedItem; }
 
 private:
     FileInfo _romFileInfo;
@@ -32,4 +35,8 @@ private:
     QueueTask<void> _loadCheatsTask;
     std::unique_ptr<GameCheats> _cheats;
     State _state = State::Loading;
+    int _selectedItem = -1;
+    bool _changed = false;
+    u32 _categoryStackLevel = 0;
+    std::array<const ICheatCategory*, 8> _categoryStack;
 };

arm9/source/romBrowser/views/cheats/CheatListItemView.cpp

@@ -6,14 +6,16 @@
 #include "gui/OamBuilder.h"
 #include "CheatListItemView.h"
 
-#define ICON_X             20
-#define ICON_Y             3
+#define ICON_X             4
+#define ICON_Y             4
 
-#define NAME_LABEL_X       40
-#define NAME_LABEL_Y       4
+#define NAME_LABEL_X       24
+#define NAME_LABEL_Y       5
 
-CheatListItemView::CheatListItemView(const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository)
+CheatListItemView::CheatListItemView(const VramOffsets& vramOffsets,
+    const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository)
     : _nameLabel(200, 16, 64, fontRepository->GetFont(FontType::Regular10))
+    , _vramOffsets(vramOffsets)
     , _materialColorScheme(materialColorScheme)
 {
     _nameLabel.SetEllipsis(true);
@@ -22,15 +24,57 @@ CheatListItemView::CheatListItemView(const MaterialColorScheme* materialColorSch
 
 void CheatListItemView::Update()
 {
-    _nameLabel.SetPosition(NAME_LABEL_X, _position.y + NAME_LABEL_Y);
+    _nameLabel.SetPosition(_position.x + NAME_LABEL_X, _position.y + NAME_LABEL_Y);
+    if (_cheat != nullptr)
+    {
+        _iconVramOffset = _cheat->GetIsCheatActive()
+            ? _vramOffsets.checkboxCheckedIconVramOffset
+            : _vramOffsets.checkboxUncheckedIconVramOffset;
+    }
     ViewContainer::Update();
 }
 
 void CheatListItemView::Draw(GraphicsContext& graphicsContext)
 {
+    if (!graphicsContext.IsVisible(GetBounds()))
+    {
+        return;
+    }
+
     auto backColor = _materialColorScheme->GetColor(md::sys::color::surfaceContainerLow);
+    if (IsFocused())
+    {
+        auto selectorFullColor = _materialColorScheme->GetColor(md::sys::color::onSurface);
+        backColor = RgbMixer::Lerp(backColor, selectorFullColor, 10, 100);
+    }
+
     _nameLabel.SetBackgroundColor(backColor);
     _nameLabel.SetForegroundColor(_materialColorScheme->onSurface);
+
+    if (IsFocused())
+    {
+        u32 selectorPaletteRow = graphicsContext.GetPaletteManager().AllocRow(
+            GradientPalette(backColor, backColor),
+            _position.y, _position.y + 24);
+        auto selectorOam = graphicsContext.GetOamManager().AllocOams(4);
+        OamBuilder::OamWithSize<64, 32>(_position.x, _position.y, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(selectorPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(selectorOam[0]);
+        OamBuilder::OamWithSize<64, 32>(_position.x + 64, _position.y, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(selectorPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(selectorOam[1]);
+        OamBuilder::OamWithSize<64, 32>(_position.x + 2 * 64, _position.y, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(selectorPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(selectorOam[2]);
+        OamBuilder::OamWithSize<64, 32>(_position.x + 2 * 64 + 32, _position.y, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(selectorPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(selectorOam[3]);
+    }
+
     ViewContainer::Draw(graphicsContext);
 
     if (graphicsContext.IsVisible(Rectangle(_position.x + ICON_X, _position.y + ICON_Y, 16, 16)))

arm9/source/romBrowser/views/cheats/CheatListItemView.h

@@ -1,6 +1,8 @@
 #pragma once
 #include "gui/views/ViewContainer.h"
 #include "gui/views/Label2DView.h"
+#include "cheats/CheatCategory.h"
+#include "cheats/Cheat.h"
 
 class MaterialColorScheme;
 class IFontRepository;
@@ -8,14 +10,22 @@ class IFontRepository;
 class CheatListItemView : public ViewContainer
 {
 public:
-    CheatListItemView(const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository);
+    struct VramOffsets
+    {
+        u32 folderIconVramOffset = 0;
+        u32 checkboxUncheckedIconVramOffset = 0;
+        u32 checkboxCheckedIconVramOffset = 0;
+        u32 cheatSelectorVramOffset = 0;
+    };
+
+    CheatListItemView(const VramOffsets& vramOffsets, const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository);
 
     void Update() override;
     void Draw(GraphicsContext& graphicsContext) override;
 
     Rectangle GetBounds() const override
     {
-        return Rectangle(_position.x, _position.y, 256, 24);
+        return Rectangle(_position.x, _position.y, 224, 24);
     }
 
     void SetName(const char* name)
@@ -23,13 +33,23 @@ public:
         _nameLabel.SetText(name);
     }
 
-    void SetIcon(u32 iconVramOffset)
+    void SetCategory(const CheatCategory* cheatCategory)
     {
-        _iconVramOffset = iconVramOffset;
+        _cheat = nullptr;
+        _nameLabel.SetText(cheatCategory->GetName());
+        _iconVramOffset = _vramOffsets.folderIconVramOffset;
+    }
+
+    void SetCheat(const Cheat* cheat)
+    {
+        _cheat = cheat;
+        _nameLabel.SetText(_cheat->GetName());
     }
 
 private:
     Label2DView _nameLabel;
-    u32 _iconVramOffset = 0;
+    VramOffsets _vramOffsets;
     const MaterialColorScheme* _materialColorScheme;
+    u32 _iconVramOffset = 0;
+    const Cheat* _cheat = nullptr;
 };

arm9/source/romBrowser/views/cheats/CheatsAdapter.h

@@ -7,30 +7,30 @@
 class CheatsAdapter : public RecyclerAdapter
 {
 public:
-    CheatsAdapter(const CheatCategory* categories, u32 numberOfCategories, const Cheat* cheats, u32 numberOfCheats,
-        const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository,
-        u32 folderIconVramOffset, u32 checkboxUncheckedIconVramOffset, u32 checkboxCheckedIconVramOffset)
-        : _categories(categories), _numberOfCategories(numberOfCategories), _cheats(cheats), _numberOfCheats(numberOfCheats)
-        , _materialColorScheme(materialColorScheme), _fontRepository(fontRepository)
-        , _folderIconVramOffset(folderIconVramOffset)
-        , _checkboxUncheckedIconVramOffset(checkboxUncheckedIconVramOffset)
-        , _checkboxCheckedIconVramOffset(checkboxCheckedIconVramOffset) { }
+    CheatsAdapter(const ICheatCategory* cheatCategory, const MaterialColorScheme* materialColorScheme,
+        const IFontRepository* fontRepository, const CheatListItemView::VramOffsets& vramOffsets)
+        : _cheatCategory(cheatCategory), _materialColorScheme(materialColorScheme)
+        , _fontRepository(fontRepository), _vramOffsets(vramOffsets) { }
 
     u32 GetItemCount() const override
     {
-        return _numberOfCategories + _numberOfCheats;
+        u32 numberOfCategories = 0;
+        _cheatCategory->GetCategories(numberOfCategories);
+        u32 numberOfCheats = 0;
+        _cheatCategory->GetCheats(numberOfCheats);
+        return numberOfCategories + numberOfCheats;
     }
 
     void GetViewSize(int& width, int& height) const override
     {
-        width = 256;
+        width = 224;
         height = 24;
     }
 
     View* CreateView() const override
     {
         LOG_DEBUG("CheatsAdapter::CreateView\n");
-        return new CheatListItemView(_materialColorScheme, _fontRepository);
+        return new CheatListItemView(_vramOffsets, _materialColorScheme, _fontRepository);
     }
 
     void DestroyView(View* view) const override
@@ -43,16 +43,18 @@ public:
     {
         LOG_DEBUG("CheatsAdapter::BindView\n");
         auto listItemView = static_cast<CheatListItemView*>(view);
-        if ((u32)index < _numberOfCategories)
+        u32 numberOfCategories = 0;
+        auto categories = _cheatCategory->GetCategories(numberOfCategories);
+        if ((u32)index < numberOfCategories)
         {
-            listItemView->SetName(_categories[index].GetName());
-            listItemView->SetIcon(_folderIconVramOffset);
+            listItemView->SetCategory(&categories[index]);
         }
         else
         {
-            index -= _numberOfCategories;
-            listItemView->SetName(_cheats[index].GetName());
-            listItemView->SetIcon(_cheats[index].GetIsCheatActive() ? _checkboxCheckedIconVramOffset : _checkboxUncheckedIconVramOffset);
+            index -= numberOfCategories;
+            u32 numberOfCheats = 0;
+            auto cheats = _cheatCategory->GetCheats(numberOfCheats);
+            listItemView->SetCheat(&cheats[index]);
         }
     }
 
@@ -62,13 +64,8 @@ public:
     }
 
 private:
-    const CheatCategory* _categories;
-    u32 _numberOfCategories;
-    const Cheat* _cheats;
-    u32 _numberOfCheats;
+    const ICheatCategory* _cheatCategory;
     const MaterialColorScheme* _materialColorScheme;
     const IFontRepository* _fontRepository;
-    u32 _folderIconVramOffset;
-    u32 _checkboxUncheckedIconVramOffset;
-    u32 _checkboxCheckedIconVramOffset;
+    CheatListItemView::VramOffsets _vramOffsets;
 };

arm9/source/romBrowser/views/cheats/CheatsBottomSheetView.cpp

@@ -4,27 +4,34 @@
 #include "themes/IFontRepository.h"
 #include "gui/input/InputProvider.h"
 #include "gui/VramContext.h"
+#include "gui/palette/GradientPalette.h"
+#include "gui/OamBuilder.h"
 #include "folderIcon.h"
 #include "checkboxChecked.h"
 #include "checkboxUnchecked.h"
+#include "cheatSelector.h"
+#include "gui/DescendingStackVramManager.h"
 #include "CheatsBottomSheetView.h"
 
 #define TITLE_LABEL_X       20
 #define TITLE_LABEL_Y       16
 
+#define LIST_X              16
+#define LIST_Y              36
+
 CheatsBottomSheetView::CheatsBottomSheetView(std::unique_ptr<CheatsViewModel> viewModel,
     const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository,
     FocusManager* focusManager)
     : _viewModel(std::move(viewModel))
     , _titleLabel(128, 16, 25, fontRepository->GetFont(FontType::Medium11))
-    , _cheatListRecycler(0, 36, 256, 124, RecyclerView::Mode::VerticalList)
+    , _cheatListRecycler(std::make_unique<RecyclerView>(LIST_X, LIST_Y, 224, 124, RecyclerView::Mode::VerticalList))
     , _materialColorScheme(materialColorScheme)
     , _fontRepository(fontRepository)
     , _focusManager(focusManager)
 {
     _titleLabel.SetText(u"Cheats");
     AddChildTail(&_titleLabel);
-    AddChildTail(&_cheatListRecycler);
+    AddChildTail(_cheatListRecycler.get());
 }
 
 void CheatsBottomSheetView::InitVram(const VramContext& vramContext)
@@ -34,17 +41,21 @@ void CheatsBottomSheetView::InitVram(const VramContext& vramContext)
     const auto objVramManager = vramContext.GetObjVramManager();
     if (objVramManager)
     {
-        _folderIconVramOffset = objVramManager->Alloc(folderIconTilesLen);
+        _vramOffsets.folderIconVramOffset = objVramManager->Alloc(folderIconTilesLen);
         dma_ntrCopy32(3, folderIconTiles,
-            objVramManager->GetVramAddress(_folderIconVramOffset), folderIconTilesLen);
+            objVramManager->GetVramAddress(_vramOffsets.folderIconVramOffset), folderIconTilesLen);
 
-        _checkboxUncheckedIconVramOffset = objVramManager->Alloc(checkboxUncheckedTilesLen);
+        _vramOffsets.checkboxUncheckedIconVramOffset = objVramManager->Alloc(checkboxUncheckedTilesLen);
         dma_ntrCopy32(3, checkboxUncheckedTiles,
-            objVramManager->GetVramAddress(_checkboxUncheckedIconVramOffset), checkboxUncheckedTilesLen);
+            objVramManager->GetVramAddress(_vramOffsets.checkboxUncheckedIconVramOffset), checkboxUncheckedTilesLen);
 
-        _checkboxCheckedIconVramOffset = objVramManager->Alloc(checkboxCheckedTilesLen);
+        _vramOffsets.checkboxCheckedIconVramOffset = objVramManager->Alloc(checkboxCheckedTilesLen);
         dma_ntrCopy32(3, checkboxCheckedTiles,
-            objVramManager->GetVramAddress(_checkboxCheckedIconVramOffset), checkboxCheckedTilesLen);
+            objVramManager->GetVramAddress(_vramOffsets.checkboxCheckedIconVramOffset), checkboxCheckedTilesLen);
+
+        _vramOffsets.cheatSelectorVramOffset = objVramManager->Alloc(cheatSelectorTilesLen);
+        dma_ntrCopy32(3, cheatSelectorTiles,
+            objVramManager->GetVramAddress(_vramOffsets.cheatSelectorVramOffset), cheatSelectorTilesLen);
     }
 
     _objVramManager = vramContext.GetObjVramManager();
@@ -53,27 +64,24 @@ void CheatsBottomSheetView::InitVram(const VramContext& vramContext)
 void CheatsBottomSheetView::Update()
 {
     _titleLabel.SetPosition(TITLE_LABEL_X, _position.y + TITLE_LABEL_Y);
-    _cheatListRecycler.SetPosition(0, _position.y + 36);
+    _cheatListRecycler->SetPosition(LIST_X, _position.y + LIST_Y);
     if (_viewModel->GetState() == CheatsViewModel::State::DisplayCheats)
     {
         if (_cheatsAdapter == nullptr)
         {
-            LOG_DEBUG("Setting adapter\n");
-            auto gameCheats = _viewModel->GetCheats();
-            u32 numberOfCategories = 0;
-            auto categories = gameCheats->GetCheatCategories(numberOfCategories);
-            u32 numberOfCheats = 0;
-            auto cheats = gameCheats->GetCheats(numberOfCheats);
-            _cheatsAdapter = new CheatsAdapter(categories, numberOfCategories, cheats, numberOfCheats,
-                _materialColorScheme, _fontRepository, _folderIconVramOffset,
-                _checkboxUncheckedIconVramOffset, _checkboxCheckedIconVramOffset);
-            _cheatListRecycler.SetAdapter(_cheatsAdapter);
-            _cheatListRecycler.InitVram(VramContext(nullptr, _objVramManager, nullptr, nullptr));
-            _cheatListRecycler.Focus(*_focusManager);
-            LOG_DEBUG("Setting adapter done\n");
+            _cheatsAdapter = new CheatsAdapter(
+                _viewModel->GetCurrentCheatCategory(), _materialColorScheme, _fontRepository, _vramOffsets);
+            _cheatListRecycler->SetAdapter(_cheatsAdapter);
+
+            // Ugly hack
+            _savedVramState = ((DescendingStackVramManager*)_objVramManager)->GetState();
+
+            _cheatListRecycler->InitVram(VramContext(nullptr, _objVramManager, nullptr, nullptr));
+            _cheatListRecycler->Focus(*_focusManager);
         }
     }
     BottomSheetView::Update();
+    _viewModel->SetSelectedItem(_cheatListRecycler->GetSelectedItem());
 }
 
 void CheatsBottomSheetView::Draw(GraphicsContext& graphicsContext)
@@ -81,12 +89,36 @@ void CheatsBottomSheetView::Draw(GraphicsContext& graphicsContext)
     graphicsContext.SetClipArea(GetBounds());
     u32 oldPrio = graphicsContext.SetPriority(1);
     {
-        _titleLabel.SetBackgroundColor(_materialColorScheme->GetColor(md::sys::color::surfaceContainerLow));
+        graphicsContext.SetClipArea(_cheatListRecycler->GetBounds());
+        _cheatListRecycler->Draw(graphicsContext);
+
+        graphicsContext.SetClipArea(GetBounds());
+
+        auto backColor = _materialColorScheme->GetColor(md::sys::color::surfaceContainerLow);
+        u32 maskPaletteRow = graphicsContext.GetPaletteManager().AllocRow(
+            GradientPalette(backColor, backColor),
+            _position.y + LIST_Y - 24, _position.y + LIST_Y);
+        auto maskOam = graphicsContext.GetOamManager().AllocOams(4);
+        OamBuilder::OamWithSize<64, 32>(LIST_X, _position.y + LIST_Y - 24, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(maskPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(maskOam[0]);
+        OamBuilder::OamWithSize<64, 32>(LIST_X + 64, _position.y + LIST_Y - 24, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(maskPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(maskOam[1]);
+        OamBuilder::OamWithSize<64, 32>(LIST_X + 2 * 64, _position.y + LIST_Y - 24, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(maskPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(maskOam[2]);
+        OamBuilder::OamWithSize<64, 32>(LIST_X + 2 * 64 + 32, _position.y + LIST_Y - 24, _vramOffsets.cheatSelectorVramOffset >> 7)
+            .WithPalette16(maskPaletteRow)
+            .WithPriority(graphicsContext.GetPriority())
+            .Build(maskOam[3]);
+
+        _titleLabel.SetBackgroundColor(backColor);
         _titleLabel.SetForegroundColor(_materialColorScheme->onSurface);
         _titleLabel.Draw(graphicsContext);
-        graphicsContext.SetClipArea(_cheatListRecycler.GetBounds());
-        _cheatListRecycler.Draw(graphicsContext);
-        // BottomSheetView::Draw(graphicsContext);
     }
     graphicsContext.SetPriority(oldPrio);
     graphicsContext.ResetClipArea();
@@ -94,10 +126,48 @@ void CheatsBottomSheetView::Draw(GraphicsContext& graphicsContext)
 
 bool CheatsBottomSheetView::HandleInput(const InputProvider& inputProvider, FocusManager& focusManager)
 {
-    if (inputProvider.Triggered(InputKey::B))
+    if (inputProvider.Triggered(InputKey::A))
+    {
+        if (focusManager.IsFocusInside(_cheatListRecycler.get()))
+        {
+            auto oldCategory = _viewModel->GetCurrentCheatCategory();
+            _viewModel->ItemActivated();
+            if (oldCategory != _viewModel->GetCurrentCheatCategory())
+            {
+                UpdateCheatList();
+            }
+
+            return true;
+        }
+    }
+    else if (inputProvider.Triggered(InputKey::B))
+    {
+        auto oldCategory = _viewModel->GetCurrentCheatCategory();
+        _viewModel->Back();
+        if (oldCategory != _viewModel->GetCurrentCheatCategory())
+        {
+            UpdateCheatList();
+        }
+        return true;
+    }
+    else if (inputProvider.Triggered(InputKey::Y))
     {
         _viewModel->Close();
         return true;
     }
     return false;
 }
+
+void CheatsBottomSheetView::UpdateCheatList()
+{
+    auto oldAdapter = _cheatsAdapter;
+    _cheatsAdapter = new CheatsAdapter(_viewModel->GetCurrentCheatCategory(), _materialColorScheme, _fontRepository, _vramOffsets);
+    _cheatListRecycler->SetAdapter(_cheatsAdapter);
+    delete oldAdapter;
+
+    // Ugly hack
+    ((DescendingStackVramManager*)_objVramManager)->SetState(_savedVramState);
+
+    _cheatListRecycler->InitVram(VramContext(nullptr, _objVramManager, nullptr, nullptr));
+    _cheatListRecycler->Focus(*_focusManager);
+}

arm9/source/romBrowser/views/cheats/CheatsBottomSheetView.h

@@ -5,6 +5,7 @@
 #include "gui/views/RecyclerView.h"
 #include "romBrowser/viewModels/CheatsViewModel.h"
 #include "CheatsAdapter.h"
+#include "CheatListItemView.h"
 
 class MaterialColorScheme;
 class IFontRepository;
@@ -17,6 +18,15 @@ public:
         const MaterialColorScheme* materialColorScheme, const IFontRepository* fontRepository,
         FocusManager* focusManager);
 
+    ~CheatsBottomSheetView() override
+    {
+        _cheatListRecycler.reset();
+        if (_cheatsAdapter != nullptr)
+        {
+            delete _cheatsAdapter;
+        }
+    }
+
     void InitVram(const VramContext& vramContext) override;
     void Update() override;
     void Draw(GraphicsContext& graphicsContext) override;
@@ -24,19 +34,20 @@ public:
 
     void Focus(FocusManager& focusManager) override
     {
-        _cheatListRecycler.Focus(focusManager);
+        _cheatListRecycler->Focus(focusManager);
     }
 
 private:
     std::unique_ptr<CheatsViewModel> _viewModel;
     Label2DView _titleLabel;
-    RecyclerView _cheatListRecycler;
+    std::unique_ptr<RecyclerView> _cheatListRecycler;
     CheatsAdapter* _cheatsAdapter = nullptr;
     const MaterialColorScheme* _materialColorScheme;
     const IFontRepository* _fontRepository;
     IVramManager* _objVramManager;
     FocusManager* _focusManager;
-    u32 _folderIconVramOffset = 0;
-    u32 _checkboxUncheckedIconVramOffset = 0;
-    u32 _checkboxCheckedIconVramOffset = 0;
+    CheatListItemView::VramOffsets _vramOffsets;
+    u32 _savedVramState = 0;
+
+    void UpdateCheatList();
 };

common/picoLoader7.h

@@ -1,7 +1,7 @@
 #pragma once
 
 /// @brief The Pico Loader API version supported by this header file.
-#define PICO_LOADER_API_VERSION     2
+#define PICO_LOADER_API_VERSION     3
 
 /// @brief Enum to specify the drive to boot from.
 typedef enum
@@ -43,6 +43,46 @@ typedef struct
     char launcherPath[256];
 } pload_header7_v2_t;
 
+/// @brief Struct representing a single Action Replay cheat opcode.
+typedef struct
+{
+    /// @brief The first part of the opcode.
+    u32 a;
+
+    /// @brief The second part of the opcode.
+    u32 b;
+} pload_cheat_opcode_t;
+
+/// @brief Struct representing a single Action Replay cheat.
+typedef struct
+{
+    /// @brief Length of \see opcodes in bytes.
+    u32 length;
+
+    /// @brief The cheat opcodes.
+    pload_cheat_opcode_t opcodes[1];
+} pload_cheat_t;
+
+/// @brief Struct representing one or more cheats. Cheats are adjacent starting from the firstCheat field.
+typedef struct
+{
+    /// @brief Length of this stucture (length field + numberOfCheats field + all cheats).
+    u32 length;
+
+    /// @brief The number of cheats.
+    u32 numberOfCheats;
+
+    /// @brief The first cheat.
+    pload_cheat_t firstCheat;
+} pload_cheats_t;
+
+/// @brief Struct representing the API version 3 part of the header of picoLoader7.bin.
+typedef struct
+{
+    /// @brief Pointer to the cheats, or \c nullptr when there are no cheats.
+    const pload_cheats_t* cheats;
+} pload_header7_v3_t;
+
 /// @brief Struct representing the header of picoLoader7.bin.
 typedef struct
 {
@@ -63,4 +103,7 @@ typedef struct
 
     /// @brief The API version 2 part of the header. Only access this when \see apiVersion >= 2.
     pload_header7_v2_t v2;
+
+    /// @brief The API version 3 part of the header. Only access this when \see apiVersion >= 3.
+    pload_header7_v3_t v3;
 } pload_header7_t;