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diff --git a/src/ui/UserInterfaceUtils.h b/src/ui/UserInterfaceUtils.h
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+/**
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend 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.
+ *
+ * Foobar 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 Foobar.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from gpg4usb-team.
+ * Their source code version also complies with GNU General Public License.
+ *
+ * The source code version of this software was modified and released
+ * by Saturneric<[email protected]> starting on May 12, 2021.
+ *
+ */
+
+#ifndef GPGFRONTEND_USER_INTERFACE_UTILS_H
+#define GPGFRONTEND_USER_INTERFACE_UTILS_H
+
+#include "ui/GpgFrontendUI.h"
+
+namespace GpgFrontend {
+class ResultAnalyse;
+}
+
+namespace GpgFrontend::UI {
+
+class InfoBoardWidget;
+class TextEdit;
+
+void refresh_info_board(InfoBoardWidget* info_board, int status,
+                        const std::string& report_text);
+
+void process_result_analyse(TextEdit* edit, InfoBoardWidget* info_board,
+                            const ResultAnalyse& result_analyse);
+
+void process_result_analyse(TextEdit* edit, InfoBoardWidget* info_board,
+                            const ResultAnalyse& result_analyse_a,
+                            const ResultAnalyse& result_analyse_b);
+
+void process_operation(QWidget* parent, const std::string& waiting_title,
+                       const std::function<void()>& func);
+
+class CommonUtils : public QWidget {
+  Q_OBJECT
+ public:
+  static CommonUtils* GetInstance();
+
+  CommonUtils();
+
+ signals:
+  void signalKeyStatusUpdated();
+
+ public slots:
+
+  void slotImportKeys(QWidget* parent, const std::string& in_buffer);
+
+  void slotImportKeyFromFile(QWidget* parent);
+
+  void slotImportKeyFromKeyServer(QWidget* parent);
+
+  void slotImportKeyFromClipboard(QWidget* parent);
+
+  void slotExecuteGpgCommand(
+      const QStringList& arguments,
+      const std::function<void(QProcess*)>& interact_func);
+
+ private:
+  static std::unique_ptr<CommonUtils> _instance;
+};
+
+}  // namespace GpgFrontend::UI
+
+#endif  // GPGFRONTEND_USER_INTERFACE_UTILS_H