Qt: Add Clear and Reset buttons to cheat manager

src/core/cheats.cpp

@@ -607,10 +607,16 @@ CheatList::Format CheatList::DetectFileFormat(const std::string& str)
 
 bool CheatList::LoadFromFile(const char* filename, Format format)
 {
-  std::optional<std::string> str = FileSystem::ReadFileToString(filename);
+  if (!FileSystem::FileExists(filename))
-  if (!str.has_value() || str->empty())
     return false;
 
+  std::optional<std::string> str = FileSystem::ReadFileToString(filename);
+  if (!str.has_value())
+    return false;
+
+  if (str->empty())
+    return true;
+
   return LoadFromString(str.value(), format);
 }
 

src/duckstation-qt/cheatmanagerdialog.cpp

@@ -33,11 +33,13 @@ static QString formatHexAndDecValue(u32 value, u8 size, bool is_signed)
   if (is_signed)
   {
     u32 value_raw = value;
-    if (size==2)
+    if (size == 2)
       value_raw &= 0xFF;
-    else if (size==4)
+    else if (size == 4)
       value_raw &= 0xFFFF;
-    return QStringLiteral("0x%1 (%2)").arg(static_cast<u32>(value_raw), size, 16, QChar('0')).arg(static_cast<int>(value)); 
+    return QStringLiteral("0x%1 (%2)")
+      .arg(static_cast<u32>(value_raw), size, 16, QChar('0'))
+      .arg(static_cast<int>(value));
   }
   else
     return QStringLiteral("0x%1 (%2)").arg(static_cast<u32>(value), size, 16, QChar('0')).arg(static_cast<uint>(value));
@@ -85,6 +87,8 @@ void CheatManagerDialog::connectUi()
   connect(m_ui.cheatListActivate, &QPushButton::clicked, this, &CheatManagerDialog::activateCodeClicked);
   connect(m_ui.cheatListImport, &QPushButton::clicked, this, &CheatManagerDialog::importClicked);
   connect(m_ui.cheatListExport, &QPushButton::clicked, this, &CheatManagerDialog::exportClicked);
+  connect(m_ui.cheatListClear, &QPushButton::clicked, this, &CheatManagerDialog::clearClicked);
+  connect(m_ui.cheatListReset, &QPushButton::clicked, this, &CheatManagerDialog::resetClicked);
 
   connect(m_ui.scanValue, &QLineEdit::textChanged, this, &CheatManagerDialog::updateScanValue);
   connect(m_ui.scanValueBase, QOverload<int>::of(&QComboBox::currentIndexChanged),
@@ -304,6 +308,11 @@ CheatList* CheatManagerDialog::getCheatList() const
   return list;
 }
 
+void CheatManagerDialog::queueUpdateCheatList()
+{
+  QMetaObject::invokeMethod(this, &CheatManagerDialog::updateCheatList, Qt::QueuedConnection);
+}
+
 void CheatManagerDialog::updateCheatList()
 {
   QSignalBlocker sb(m_ui.cheatList);
@@ -647,6 +656,36 @@ void CheatManagerDialog::exportClicked()
     QMessageBox::critical(this, tr("Error"), tr("Failed to save cheat file. The log may contain more information."));
 }
 
+void CheatManagerDialog::clearClicked()
+{
+  if (QMessageBox::question(this, tr("Confirm Clear"),
+                            tr("Are you sure you want to remove all cheats? This is not reversible.")) !=
+      QMessageBox::Yes)
+  {
+    return;
+  }
+
+  QtHostInterface::GetInstance()->executeOnEmulationThread([] { QtHostInterface::GetInstance()->ClearCheatList(true); },
+                                                           true);
+  updateCheatList();
+}
+
+void CheatManagerDialog::resetClicked()
+{
+  if (QMessageBox::question(
+        this, tr("Confirm Reset"),
+        tr(
+          "Are you sure you want to reset the cheat list? Any cheats not in the DuckStation database WILL BE LOST.")) !=
+      QMessageBox::Yes)
+  {
+    return;
+  }
+
+  QtHostInterface::GetInstance()->executeOnEmulationThread([] { QtHostInterface::GetInstance()->DeleteCheatList(); },
+                                                           true);
+  updateCheatList();
+}
+
 void CheatManagerDialog::addToWatchClicked()
 {
   const int index = getSelectedResultIndex();
@@ -675,9 +714,9 @@ void CheatManagerDialog::addManualWatchAddressClicked()
   if (index < 0 || !ok)
     return;
 
-  if (index==1 || index==4)
+  if (index == 1 || index == 4)
     address.value() &= 0xFFFFFFFE;
-  else if (index==2 || index==5)
+  else if (index == 2 || index == 5)
     address.value() &= 0xFFFFFFFC;
 
   m_watch.AddEntry(StringUtil::StdStringFromFormat("0x%08x", address.value()), address.value(),

src/duckstation-qt/cheatmanagerdialog.h

@@ -40,6 +40,8 @@ private Q_SLOTS:
   void importFromFileTriggered();
   void importFromTextTriggered();
   void exportClicked();
+  void clearClicked();
+  void resetClicked();
 
   void addToWatchClicked();
   void addManualWatchAddressClicked();
@@ -73,6 +75,7 @@ private:
   int getSelectedCheatIndex() const;
   int getSelectedResultIndex() const;
   int getSelectedWatchIndex() const;
+  void queueUpdateCheatList();
 
   Ui::CheatManagerDialog m_ui;
 

src/duckstation-qt/cheatmanagerdialog.ui

@@ -84,6 +84,20 @@
            </property>
           </widget>
          </item>
+         <item>
+          <widget class="QPushButton" name="cheatListClear">
+           <property name="text">
+            <string>Clear</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="cheatListReset">
+           <property name="text">
+            <string>Reset</string>
+           </property>
+          </widget>
+         </item>
          <item>
           <spacer name="horizontalSpacer">
            <property name="orientation">

src/frontend-common/common_host_interface.cpp

@@ -2722,6 +2722,40 @@ bool CommonHostInterface::SaveCheatList(const char* filename)
   return true;
 }
 
+bool CommonHostInterface::DeleteCheatList()
+{
+  if (!System::IsValid())
+    return false;
+
+  const std::string filename(GetCheatFileName());
+  if (!filename.empty())
+  {
+    if (!FileSystem::DeleteFile(filename.c_str()))
+      return false;
+
+    AddFormattedOSDMessage(5.0f, TranslateString("OSDMessage", "Deleted cheat list '%s'."), filename.c_str());
+  }
+
+  System::SetCheatList(nullptr);
+  return true;
+}
+
+void CommonHostInterface::ClearCheatList(bool save_to_file)
+{
+  if (!System::IsValid())
+    return;
+
+  CheatList* cl = System::GetCheatList();
+  if (!cl)
+    return;
+
+  while (cl->GetCodeCount() > 0)
+    cl->RemoveCode(cl->GetCodeCount() - 1);
+
+  if (save_to_file)
+    SaveCheatList();
+}
+
 void CommonHostInterface::SetCheatCodeState(u32 index, bool enabled, bool save_to_file)
 {
   if (!System::IsValid() || !System::HasCheatList())

src/frontend-common/common_host_interface.h

@@ -220,6 +220,12 @@ public:
   /// Saves the current cheat list to the specified file.
   bool SaveCheatList(const char* filename);
 
+  /// Deletes the cheat list, if present.
+  bool DeleteCheatList();
+
+  /// Removes all cheats from the cheat list.
+  void ClearCheatList(bool save_to_file);
+
   /// Enables/disabled the specified cheat code.
   void SetCheatCodeState(u32 index, bool enabled, bool save_to_file);