Implement MainRAM management dialog😁 (#1248)

* Implement MainRAM management dialog

* Modify RAMInfoDialog

- use emuThread to avoid a race condition.
- replace RAMUpdateThread to QTimer

Co-Authored-By: RSDuck <RSDuck@users.noreply.github.com>

* Update src/frontend/qt_sdl/RAMInfoDialog.cpp

small typo

Co-authored-by: Rayyan Ansari <68647953+RayyanAnsari@users.noreply.github.com>

* Update src/frontend/qt_sdl/RAMInfoDialog.h

small typo

Co-authored-by: Rayyan Ansari <68647953+RayyanAnsari@users.noreply.github.com>

* typo errors in RAMInfoDialog

Rrevious->Previous

* add new line to the end of the file

Co-authored-by: Rayyan Ansari <rayyan@ansari.sh>

* enable raminfo when cart is inserted

* Modify that only the 'value' item can be edited in RAMinfoDialog

* fix: function name incorrect error

* fix: function name incorrect error2

* fix: wrong way to get ram value

Co-authored-by: RSDuck <RSDuck@users.noreply.github.com>
Co-authored-by: Rayyan Ansari <68647953+RayyanAnsari@users.noreply.github.com>
Co-authored-by: Rayyan Ansari <rayyan@ansari.sh>

6 files changed, 714 insertions, 0 deletions

diff --git a/src/frontend/qt_sdl/CMakeLists.txt b/src/frontend/qt_sdl/CMakeLists.txt
index 4b5cb12..8b29bae 100644
--- a/src/frontend/qt_sdl/CMakeLists.txt
+++ b/src/frontend/qt_sdl/CMakeLists.txt
@@ -16,6 +16,7 @@ SET(SOURCES_QT_SDL
     WifiSettingsDialog.cpp
     InterfaceSettingsDialog.cpp
     ROMInfoDialog.cpp
+    RAMInfoDialog.cpp
     TitleManagerDialog.cpp
     Input.cpp
     LAN_PCap.cpp
diff --git a/src/frontend/qt_sdl/RAMInfoDialog.cpp b/src/frontend/qt_sdl/RAMInfoDialog.cpp
new file mode 100644
index 0000000..b13ff02
--- /dev/null
+++ b/src/frontend/qt_sdl/RAMInfoDialog.cpp
@@ -0,0 +1,302 @@
+/*
+    Copyright 2016-2021 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#include "RAMInfoDialog.h"
+#include "ui_RAMInfoDialog.h"
+
+#include "main.h"
+
+extern EmuThread* emuThread;
+
+s32 GetMainRAMValue(const u32& addr, const ramInfo_ByteType& byteType)
+{
+    switch (byteType)
+    {
+    case ramInfo_OneByte:
+        return *(s8*)(NDS::MainRAM + (addr&NDS::MainRAMMask));
+    case ramInfo_TwoBytes:
+        return *(s16*)(NDS::MainRAM + (addr&NDS::MainRAMMask));
+    case ramInfo_FourBytes:
+        return *(s32*)(NDS::MainRAM + (addr&NDS::MainRAMMask));
+    default:
+        return 0;
+    }
+}
+
+RAMInfoDialog* RAMInfoDialog::currentDlg = nullptr;
+
+RAMInfoDialog::RAMInfoDialog(QWidget* parent) : QDialog(parent), ui(new Ui::RAMInfoDialog)
+{
+    ui->setupUi(this);
+    setAttribute(Qt::WA_DeleteOnClose);
+
+    qRegisterMetaType<QVector<int>>("QVector<int>");
+    qRegisterMetaType<u32>("u32");
+    qRegisterMetaType<s32>("s32");
+    qRegisterMetaType<s16>("s16");
+    qRegisterMetaType<s8>("s8");
+
+    SearchThread = new RAMSearchThread(this);
+    connect(SearchThread, &RAMSearchThread::SetProgressbarValue, this, &RAMInfoDialog::SetProgressbarValue);
+    connect(SearchThread, &RAMSearchThread::finished, this, &RAMInfoDialog::OnSearchFinished);
+    // First search (Show everything in main ram)
+    SearchThread->Start(ramInfoSTh_SearchAll);
+
+    TableUpdater = new QTimer(this);
+    TableUpdater->setInterval(100);
+    connect(TableUpdater, &QTimer::timeout, this, &RAMInfoDialog::ShowRowsInTable);
+    TableUpdater->start();
+}
+
+RAMInfoDialog::~RAMInfoDialog()
+{
+    delete SearchThread;
+    if (TableUpdater->isActive())
+        TableUpdater->stop();
+    delete TableUpdater;
+    delete ui;
+}
+
+void RAMInfoDialog::OnSearchFinished()
+{
+    SearchThread->wait();
+    ui->btnSearch->setEnabled(true);
+    ui->ramTable->clearContents();
+    ui->ramTable->setRowCount(SearchThread->GetResults()->size());
+    ui->ramTable->verticalScrollBar()->setSliderPosition(0);
+    ui->txtFound->setText(QString("Found: %1").arg(SearchThread->GetResults()->size()));
+}
+
+void RAMInfoDialog::ShowRowsInTable()
+{
+    const u32& scrollValue = ui->ramTable->verticalScrollBar()->sliderPosition();
+    std::vector<ramInfo_RowData>* RowDataVector = SearchThread->GetResults();
+
+    for (u32 row = scrollValue; row < std::min<u32>(scrollValue+25, RowDataVector->size()); row++)
+    {
+        ramInfo_RowData& rowData = RowDataVector->at(row);
+        rowData.Update(SearchThread->GetSearchByteType());
+
+        if (ui->ramTable->item(row, ramInfo_Address) == nullptr)
+        {
+            // A new row
+            QTableWidgetItem* addressItem = new QTableWidgetItem(QString("%1").arg(rowData.Address, 8, 16));
+            QTableWidgetItem* valueItem = new QTableWidgetItem(QString("%1").arg(rowData.Value));
+            QTableWidgetItem* previousItem = new QTableWidgetItem(QString("%1").arg(rowData.Previous));
+
+            addressItem->setFlags(addressItem->flags() & ~Qt::ItemIsEditable);
+            valueItem->setFlags(valueItem->flags() | Qt::ItemIsEditable);
+            previousItem->setFlags(previousItem->flags() & ~Qt::ItemIsEditable);
+
+            ui->ramTable->setItem(row, ramInfo_Address, addressItem);
+            ui->ramTable->setItem(row, ramInfo_Value, valueItem);
+            ui->ramTable->setItem(row, ramInfo_Previous, previousItem);
+        }
+        else
+        {
+            // A row that exists
+            ui->ramTable->item(row, ramInfo_Address)->setText(QString("%1").arg(rowData.Address, 8, 16));
+            ui->ramTable->item(row, ramInfo_Value)->setText(QString("%1").arg(rowData.Value));
+            ui->ramTable->item(row, ramInfo_Previous)->setText(QString("%1").arg(rowData.Previous));
+            if (rowData.Value != rowData.Previous) 
+                ui->ramTable->item(row, ramInfo_Previous)->setForeground(Qt::red);
+        }
+    }
+}
+
+void RAMInfoDialog::ClearTableContents()
+{
+    ui->ramTable->clearContents();
+    ui->ramTable->setRowCount(0);
+}
+
+void RAMInfoDialog::SetProgressbarValue(const u32& value)
+{
+    ui->progressBar->setValue(value);
+}
+
+void RAMInfoDialog::done(int r)
+{
+    QDialog::done(r);
+    closeDlg();
+}
+
+void RAMInfoDialog::on_btnSearch_clicked()
+{
+    ui->btnSearch->setEnabled(false);
+    ui->radiobtn1byte->setEnabled(false);
+    ui->radiobtn2bytes->setEnabled(false);
+    ui->radiobtn4bytes->setEnabled(false);
+
+    if (ui->txtSearch->text().isEmpty())
+        SearchThread->Start(ramInfoSTh_SearchAll);
+    else
+        SearchThread->Start(ui->txtSearch->text().toInt());
+    
+    if (!TableUpdater->isActive())
+        TableUpdater->start();
+}
+
+void RAMInfoDialog::on_btnClear_clicked()
+{
+    SearchThread->Stop();
+    TableUpdater->stop();
+
+    ui->radiobtn1byte->setEnabled(true);
+    ui->radiobtn2bytes->setEnabled(true);
+    ui->radiobtn4bytes->setEnabled(true);
+
+    OnSearchFinished();
+}
+
+void RAMInfoDialog::on_radiobtn1byte_clicked()
+{
+    SearchThread->SetSearchByteType(ramInfo_OneByte);
+}
+
+void RAMInfoDialog::on_radiobtn2bytes_clicked()
+{
+    SearchThread->SetSearchByteType(ramInfo_TwoBytes);
+}
+
+void RAMInfoDialog::on_radiobtn4bytes_clicked()
+{
+    SearchThread->SetSearchByteType(ramInfo_FourBytes);
+}
+
+void RAMInfoDialog::on_ramTable_itemChanged(QTableWidgetItem *item)
+{
+    ramInfo_RowData& rowData = SearchThread->GetResults()->at(item->row());
+    s32 itemValue = item->text().toInt();
+
+    if (rowData.Value != itemValue)
+        rowData.SetValue(itemValue);
+}
+
+/**
+ * RAMSearchThread 
+ */
+
+RAMSearchThread::RAMSearchThread(RAMInfoDialog* dialog) : Dialog(dialog)
+{
+    RowDataVector = new std::vector<ramInfo_RowData>();
+}
+
+RAMSearchThread::~RAMSearchThread()
+{
+    Stop();
+    if (RowDataVector)
+    {
+        delete RowDataVector;
+        RowDataVector = nullptr;
+    }
+}
+
+void RAMSearchThread::Start(const s32& searchValue, const ramInfoSTh_SearchMode& searchMode)
+{
+    SearchValue = searchValue;
+    SearchMode = searchMode;
+    start();
+}
+
+void RAMSearchThread::Start(const ramInfoSTh_SearchMode& searchMode)
+{
+    SearchMode = searchMode;
+    start();
+}
+
+void RAMSearchThread::Stop()
+{
+    SearchRunning = false;
+    RowDataVector->clear();
+    quit();
+    wait();
+}
+
+void RAMSearchThread::run()
+{
+    SearchRunning = true;
+    u32 progress = 0;
+
+    // Pause game running
+    emuThread->emuPause();
+
+    // For following search modes below, RowDataVector must be filled.
+    if (SearchMode == ramInfoSTh_SearchAll || RowDataVector->size() == 0)
+    {
+        // First search mode
+        for (u32 addr = 0x02000000; SearchRunning && addr < 0x02000000+NDS::MainRAMMaxSize; addr += SearchByteType)
+        {
+            const s32& value = GetMainRAMValue(addr, SearchByteType);
+
+            RowDataVector->push_back({ addr, value, value });
+
+            // A solution to prevent to call too many slot.
+            u32 newProgress = (int)((addr-0x02000000) / (NDS::MainRAMMaxSize-1.0f) * 100);
+            if (progress < newProgress)
+            {
+                progress = newProgress;
+                emit SetProgressbarValue(progress);
+            }
+        }
+    }
+    
+    if (SearchMode == ramInfoSTh_Default)
+    {
+        // Next search mode
+        std::vector<ramInfo_RowData>* newRowDataVector = new std::vector<ramInfo_RowData>();
+        for (u32 row = 0; SearchRunning && row < RowDataVector->size(); row++)
+        {
+            const u32& addr = RowDataVector->at(row).Address;
+            const s32& value = GetMainRAMValue(addr, SearchByteType);
+
+            if (SearchValue == value)
+                newRowDataVector->push_back({ addr, value, value });
+
+            // A solution to prevent to call too many slot.
+            u32 newProgress = (int)(row / (RowDataVector->size()-1.0f) * 100);
+            if (progress < newProgress)
+            {
+                progress = newProgress;
+                emit SetProgressbarValue(progress);
+            }
+        }
+        delete RowDataVector;
+        RowDataVector = newRowDataVector;
+    }
+
+    // Unpause game running
+    emuThread->emuUnpause();
+
+    SearchRunning = false;
+}
+
+void RAMSearchThread::SetSearchByteType(const ramInfo_ByteType& bytetype)
+{
+    SearchByteType = bytetype;
+}
+
+ramInfo_ByteType RAMSearchThread::GetSearchByteType() const
+{
+    return SearchByteType;
+}
+
+std::vector<ramInfo_RowData>* RAMSearchThread::GetResults()
+{
+    return RowDataVector;
+}
diff --git a/src/frontend/qt_sdl/RAMInfoDialog.h b/src/frontend/qt_sdl/RAMInfoDialog.h
new file mode 100644
index 0000000..f44ae93
--- /dev/null
+++ b/src/frontend/qt_sdl/RAMInfoDialog.h
@@ -0,0 +1,161 @@
+/*
+    Copyright 2016-2021 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef RAMINFODIALOG_H
+#define RAMINFODIALOG_H
+
+#include <QDialog>
+#include <QTableWidget>
+#include <QScrollBar>
+#include <QThread>
+#include <QTimer>
+
+#include "types.h"
+#include "NDS.h"
+
+namespace Ui { class RAMInfoDialog; }
+class RAMInfoDialog;
+class RAMSearchThread;
+class RAMUpdateThread;
+
+enum ramInfo_ByteType
+{
+    ramInfo_OneByte = 1, 
+    ramInfo_TwoBytes = 2, 
+    ramInfo_FourBytes = 4
+};
+
+enum ramInfoSTh_SearchMode
+{
+    ramInfoSTh_Default,
+    ramInfoSTh_SearchAll
+};
+
+enum
+{
+    ramInfo_Address, 
+    ramInfo_Value, 
+    ramInfo_Previous
+};
+
+s32 GetMainRAMValue(const u32& addr, const ramInfo_ByteType& byteType);
+
+struct ramInfo_RowData
+{
+    u32 Address;
+    s32 Value;
+    s32 Previous;
+
+    void Update(const ramInfo_ByteType& byteType)
+    {
+        Value = GetMainRAMValue(Address, byteType);
+    }
+
+    void SetValue(const s32& value)
+    {
+        NDS::MainRAM[Address&NDS::MainRAMMask] = (u32)value;
+        Value = value;
+    }
+};
+
+class RAMInfoDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit RAMInfoDialog(QWidget* parent);
+    ~RAMInfoDialog();
+
+    static RAMInfoDialog* currentDlg;
+    static RAMInfoDialog* openDlg(QWidget* parent)
+    {
+        if (currentDlg)
+        {
+            currentDlg->activateWindow();
+            return currentDlg;
+        }
+
+        currentDlg = new RAMInfoDialog(parent);
+        currentDlg->show();
+        return currentDlg;
+    }
+    static void closeDlg()
+    {
+        currentDlg = nullptr;
+    }
+
+    s32 SearchValue = 0;
+
+    void ClearTableContents();
+
+private slots:
+    void done(int r);
+
+    void on_btnSearch_clicked();
+    void on_btnClear_clicked();
+    void on_radiobtn1byte_clicked();
+    void on_radiobtn2bytes_clicked();
+    void on_radiobtn4bytes_clicked();
+    void on_ramTable_itemChanged(QTableWidgetItem *item);
+
+    void OnSearchFinished();
+    void ShowRowsInTable();
+    void SetProgressbarValue(const u32& value);
+
+private:
+    Ui::RAMInfoDialog* ui;
+    
+    RAMSearchThread* SearchThread;
+    QTimer* TableUpdater;
+};
+
+class RAMSearchThread : public QThread
+{
+    Q_OBJECT
+
+public:
+    explicit RAMSearchThread(RAMInfoDialog* dialog);
+    ~RAMSearchThread() override;
+
+    void Start(const s32& searchValue, const ramInfoSTh_SearchMode& searchMode = ramInfoSTh_Default);
+    void Start(const ramInfoSTh_SearchMode& searchMode);
+    
+    void SetSearchByteType(const ramInfo_ByteType& bytetype);
+    ramInfo_ByteType GetSearchByteType() const;
+    std::vector<ramInfo_RowData>* GetResults();
+
+    void Stop();
+
+private:
+    void run();
+
+    RAMInfoDialog* Dialog;
+    bool SearchRunning = false;
+
+    ramInfoSTh_SearchMode SearchMode;
+    s32 SearchValue;
+    ramInfo_ByteType SearchByteType = ramInfo_OneByte;
+    std::vector<ramInfo_RowData>* RowDataVector = nullptr;
+
+    void ClearTableContents();
+
+signals:
+    void SetProgressbarValue(const u32& value);
+};
+
+#endif // RAMINFODIALOG_H
diff --git a/src/frontend/qt_sdl/RAMInfoDialog.ui b/src/frontend/qt_sdl/RAMInfoDialog.ui
new file mode 100644
index 0000000..46beaa5
--- /dev/null
+++ b/src/frontend/qt_sdl/RAMInfoDialog.ui
@@ -0,0 +1,237 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>RAMInfoDialog</class>
+ <widget class="QDialog" name="RAMInfoDialog">
+  <property name="enabled">
+   <bool>true</bool>
+  </property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>550</width>
+    <height>411</height>
+   </rect>
+  </property>
+  <property name="minimumSize">
+   <size>
+    <width>550</width>
+    <height>411</height>
+   </size>
+  </property>
+  <property name="maximumSize">
+   <size>
+    <width>550</width>
+    <height>411</height>
+   </size>
+  </property>
+  <property name="windowTitle">
+   <string>RAM info - melonDS</string>
+  </property>
+  <property name="modal">
+   <bool>false</bool>
+  </property>
+  <widget class="QGroupBox" name="groupBox">
+   <property name="geometry">
+    <rect>
+     <x>340</x>
+     <y>10</y>
+     <width>201</width>
+     <height>111</height>
+    </rect>
+   </property>
+   <property name="title">
+    <string>Search</string>
+   </property>
+   <widget class="QPushButton" name="btnSearch">
+    <property name="geometry">
+     <rect>
+      <x>130</x>
+      <y>20</y>
+      <width>61</width>
+      <height>23</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Search</string>
+    </property>
+   </widget>
+   <widget class="QLineEdit" name="txtSearch">
+    <property name="geometry">
+     <rect>
+      <x>50</x>
+      <y>20</y>
+      <width>71</width>
+      <height>21</height>
+     </rect>
+    </property>
+    <property name="maxLength">
+     <number>5</number>
+    </property>
+   </widget>
+   <widget class="QPushButton" name="btnClear">
+    <property name="geometry">
+     <rect>
+      <x>120</x>
+      <y>80</y>
+      <width>71</width>
+      <height>23</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Clear</string>
+    </property>
+   </widget>
+   <widget class="QLabel" name="labelValue">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>20</y>
+      <width>41</width>
+      <height>21</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Value:</string>
+    </property>
+   </widget>
+   <widget class="QRadioButton" name="radiobtn1byte">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>50</y>
+      <width>90</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>1byte</string>
+    </property>
+    <property name="checked">
+     <bool>true</bool>
+    </property>
+   </widget>
+   <widget class="QRadioButton" name="radiobtn2bytes">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>70</y>
+      <width>90</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>2bytes</string>
+    </property>
+   </widget>
+   <widget class="QRadioButton" name="radiobtn4bytes">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>90</y>
+      <width>90</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>4bytes</string>
+    </property>
+   </widget>
+  </widget>
+  <widget class="QProgressBar" name="progressBar">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>380</y>
+     <width>321</width>
+     <height>23</height>
+    </rect>
+   </property>
+   <property name="maximum">
+    <number>100</number>
+   </property>
+   <property name="value">
+    <number>0</number>
+   </property>
+   <property name="alignment">
+    <set>Qt::AlignCenter</set>
+   </property>
+   <property name="textVisible">
+    <bool>true</bool>
+   </property>
+   <property name="format">
+    <string>%p%</string>
+   </property>
+  </widget>
+  <widget class="QTableWidget" name="ramTable">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>30</y>
+     <width>321</width>
+     <height>341</height>
+    </rect>
+   </property>
+   <property name="minimumSize">
+    <size>
+     <width>321</width>
+     <height>341</height>
+    </size>
+   </property>
+   <property name="maximumSize">
+    <size>
+     <width>321</width>
+     <height>341</height>
+    </size>
+   </property>
+   <property name="editTriggers">
+    <set>QAbstractItemView::AnyKeyPressed|QAbstractItemView::DoubleClicked</set>
+   </property>
+   <property name="alternatingRowColors">
+    <bool>true</bool>
+   </property>
+   <property name="selectionBehavior">
+    <enum>QAbstractItemView::SelectRows</enum>
+   </property>
+   <attribute name="verticalHeaderVisible">
+    <bool>false</bool>
+   </attribute>
+   <attribute name="verticalHeaderMinimumSectionSize">
+    <number>16</number>
+   </attribute>
+   <attribute name="verticalHeaderDefaultSectionSize">
+    <number>16</number>
+   </attribute>
+   <column>
+    <property name="text">
+     <string>Address</string>
+    </property>
+   </column>
+   <column>
+    <property name="text">
+     <string>Value</string>
+    </property>
+   </column>
+   <column>
+    <property name="text">
+     <string>Previous</string>
+    </property>
+   </column>
+  </widget>
+  <widget class="QLabel" name="txtFound">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>10</y>
+     <width>101</width>
+     <height>16</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Found:</string>
+   </property>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/src/frontend/qt_sdl/main.cpp b/src/frontend/qt_sdl/main.cpp
index 535bfee..7454ffc 100644
--- a/src/frontend/qt_sdl/main.cpp
+++ b/src/frontend/qt_sdl/main.cpp
@@ -60,6 +60,7 @@
 #include "WifiSettingsDialog.h"
 #include "InterfaceSettingsDialog.h"
 #include "ROMInfoDialog.h"
+#include "RAMInfoDialog.h"
 #include "TitleManagerDialog.h"
 
 #include "types.h"
@@ -1440,6 +1441,9 @@ MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
         actROMInfo = menu->addAction("ROM info");
         connect(actROMInfo, &QAction::triggered, this, &MainWindow::onROMInfo);
 
+        actRAMInfo = menu->addAction("RAM info");
+        connect(actRAMInfo, &QAction::triggered, this, &MainWindow::onRAMInfo);
+
         actTitleManager = menu->addAction("Manage DSi titles");
         connect(actTitleManager, &QAction::triggered, this, &MainWindow::onOpenTitleManager);
     }
@@ -1671,6 +1675,7 @@ MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
     actEnableCheats->setChecked(Config::EnableCheats);
 
     actROMInfo->setEnabled(false);
+    actRAMInfo->setEnabled(false);
 
     actSavestateSRAMReloc->setChecked(Config::SavestateRelocSRAM);
 
@@ -2082,6 +2087,7 @@ void MainWindow::updateCartInserted(bool gba)
         actImportSavefile->setEnabled(inserted);
         actSetupCheats->setEnabled(inserted);
         actROMInfo->setEnabled(inserted);
+        actRAMInfo->setEnabled(inserted);
     }
 }
 
@@ -2557,6 +2563,11 @@ void MainWindow::onROMInfo()
     ROMInfoDialog* dlg = ROMInfoDialog::openDlg(this);
 }
 
+void MainWindow::onRAMInfo()
+{
+    RAMInfoDialog* dlg = RAMInfoDialog::openDlg(this);
+}
+
 void MainWindow::onOpenTitleManager()
 {
     TitleManagerDialog* dlg = TitleManagerDialog::openDlg(this);
diff --git a/src/frontend/qt_sdl/main.h b/src/frontend/qt_sdl/main.h
index d4e40d7..6929d69 100644
--- a/src/frontend/qt_sdl/main.h
+++ b/src/frontend/qt_sdl/main.h
@@ -252,6 +252,7 @@ private slots:
     void onSetupCheats();
     void onCheatsDialogFinished(int res);
     void onROMInfo();
+    void onRAMInfo();
     void onOpenTitleManager();
 
     void onOpenEmuSettings();
@@ -341,6 +342,7 @@ public:
     QAction* actEnableCheats;
     QAction* actSetupCheats;
     QAction* actROMInfo;
+    QAction* actRAMInfo;
     QAction* actTitleManager;
 
     QAction* actEmuSettings;