QtUtils: Add UTF8CodePointCountValidator

Source/Core/DolphinQt/CMakeLists.txt

@@ -235,6 +235,8 @@ add_executable(dolphin-emu
   QtUtils/ParallelProgressDialog.h
   QtUtils/ImageConverter.cpp
   QtUtils/ImageConverter.h
+  QtUtils/UTF8CodePointCountValidator.cpp
+  QtUtils/UTF8CodePointCountValidator.h
   QtUtils/WindowActivationEventFilter.cpp
   QtUtils/WindowActivationEventFilter.h
   QtUtils/WinIconHelper.cpp

Source/Core/DolphinQt/DolphinQt.vcxproj

@@ -186,6 +186,7 @@
     <QtMoc Include="QtUtils\FlowLayout.h" />
     <QtMoc Include="QtUtils\ModalMessageBox.h" />
     <QtMoc Include="QtUtils\ParallelProgressDialog.h" />
+    <QtMoc Include="QtUtils\UTF8CodePointCountValidator.h" />
     <QtMoc Include="QtUtils\WindowActivationEventFilter.h" />
     <QtMoc Include="QtUtils\WrapInScrollArea.h" />
     <QtMoc Include="RenderWidget.h" />
@@ -291,6 +292,7 @@
     <ClCompile Include="$(QtMocOutPrefix)NewPatchDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)PadMappingDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)ParallelProgressDialog.cpp" />
+    <ClCompile Include="$(QtMocOutPrefix)UTF8CodePointCountValidator.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)PatchesWidget.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)PatchInstructionDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)PathPane.cpp" />
@@ -433,6 +435,7 @@
     <ClCompile Include="QtUtils\FlowLayout.cpp" />
     <ClCompile Include="QtUtils\ImageConverter.cpp" />
     <ClCompile Include="QtUtils\ModalMessageBox.cpp" />
+    <ClCompile Include="QtUtils\UTF8CodePointCountValidator.cpp" />
     <ClCompile Include="QtUtils\WindowActivationEventFilter.cpp" />
     <ClCompile Include="QtUtils\WrapInScrollArea.cpp" />
     <ClCompile Include="RenderWidget.cpp" />

Source/Core/DolphinQt/QtUtils/UTF8CodePointCountValidator.cpp

@@ -0,0 +1,20 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt/QtUtils/UTF8CodePointCountValidator.h"
+
+#include "Common/StringUtil.h"
+
+UTF8CodePointCountValidator::UTF8CodePointCountValidator(int max_count, QObject* parent)
+    : QValidator(parent), m_max_count(max_count)
+{
+}
+
+QValidator::State UTF8CodePointCountValidator::validate(QString& input, int& pos) const
+{
+  if (StringUTF8CodePointCount(input.toStdString()) > m_max_count)
+    return QValidator::Invalid;
+
+  return QValidator::Acceptable;
+}

Source/Core/DolphinQt/QtUtils/UTF8CodePointCountValidator.h

@@ -0,0 +1,19 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QString>
+#include <QValidator>
+
+class UTF8CodePointCountValidator : public QValidator
+{
+  Q_OBJECT
+public:
+  explicit UTF8CodePointCountValidator(int max_count, QObject* parent = nullptr);
+
+  QValidator::State validate(QString& input, int& pos) const override;
+
+  int m_max_count;
+};