Qt/Debugger: Implement patch instruction preview

Source/Core/DolphinQt/Debugger/PatchInstructionDialog.h

@@ -0,0 +1,35 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QDialog>
+
+#include "Common/CommonTypes.h"
+
+class QDialogButtonBox;
+class QLabel;
+class QLineEdit;
+
+class PatchInstructionDialog : public QDialog
+{
+  Q_OBJECT
+public:
+  explicit PatchInstructionDialog(QWidget* parent, u32 address, u32 value);
+
+  u32 GetCode() const;
+
+private:
+  void CreateWidgets();
+  void ConnectWidgets();
+
+  void OnEditChanged();
+
+  u32 m_code;
+  u32 m_address;
+
+  QLineEdit* m_input_edit;
+  QLabel* m_preview_label;
+  QDialogButtonBox* m_button_box;
+};