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diff --git a/src/ui/MainWindow.h b/src/ui/MainWindow.h
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+++ b/src/ui/MainWindow.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 __GPGWIN_H__
+#define __GPGWIN_H__
+
+#include "gpg/GpgConstants.h"
+#include "gpg/result_analyse/DecryptResultAnalyse.h"
+#include "gpg/result_analyse/EncryptResultAnalyse.h"
+#include "gpg/result_analyse/SignResultAnalyse.h"
+#include "ui/FileEncryptionDialog.h"
+#include "ui/FindWidget.h"
+#include "ui/GpgFrontendUI.h"
+#include "ui/KeyMgmt.h"
+#include "ui/KeyUploadDialog.h"
+#include "ui/WaitingDialog.h"
+#include "ui/Wizard.h"
+#include "ui/help/AboutDialog.h"
+#include "ui/settings/SettingsDialog.h"
+#include "ui/widgets/InfoBoardWidget.h"
+#include "ui/widgets/TextEdit.h"
+
+namespace GpgFrontend::UI {
+/**
+ * @brief
+ *
+ */
+class MainWindow : public QMainWindow {
+  Q_OBJECT
+
+ public:
+  /**
+   * @brief
+   *
+   */
+  MainWindow();
+
+  /**
+   * ONLY Called from main()
+   */
+  void init() noexcept;
+
+ signals:
+  void loaded();
+
+ public slots:
+
+  void slotSetStatusBarText(const QString& text);
+
+ protected:
+  /**
+   * @details Close event shows a save dialog, if there are unsaved documents on
+   * exit.
+   * @param event
+   */
+  void closeEvent(QCloseEvent* event) override;
+
+ public slots:
+
+  /**
+   * @details Open a new tab for path
+   */
+  void slotOpenFile(QString& path);
+
+  /**
+   * @details Open dialog for encrypting file.
+   */
+  void slotFileEncrypt();
+
+  /**
+   * @details Open dialog for decrypting file.
+   */
+  void slotFileDecrypt();
+
+  /**
+   * @details Open dialog for signing file.
+   */
+  void slotFileSign();
+
+  /**
+   * @details Open dialog for verifying file.
+   */
+  void slotFileVerify();
+
+  /**
+   * @details Open dialog for signing file.
+   */
+  void slotFileEncryptSign();
+
+  /**
+   * @details Open dialog for verifying file.
+   */
+  void slotFileDecryptVerify();
+
+ private slots:
+
+  /**
+   * @details encrypt the text of currently active textedit-page
+   * with the currently checked keys
+   */
+  void slotEncrypt();
+
+  /**
+   * @details encrypt and sign the text of currently active textedit-page
+   * with the currently checked keys
+   */
+  void slotEncryptSign();
+
+  /**
+   * @details Show a passphrase dialog and decrypt the text of currently active
+   * tab.
+   */
+  void slotDecrypt();
+
+  /**
+   * @details Sign the text of currently active tab with the checked private
+   * keys
+   */
+  void slotSign();
+
+  /**
+   * @details Verify the text of currently active tab and show verify
+   * information. If document is signed with a key, which is not in keylist,
+   * show import missing key from keyserver in Menu of verifynotification.
+   */
+  void slotVerify();
+
+  /**
+   * @details decrypt and verify the text of currently active textedit-page
+   * with the currently checked keys
+   */
+  void slotDecryptVerify();
+
+  /**
+   * @details Open dialog for encrypting file.
+   */
+  void slotFileEncryptCustom();
+
+  /**
+   * @details Open dialog for decrypting file.
+   */
+  void slotFileDecryptCustom();
+
+  /**
+   * @details Open dialog for signing file.
+   */
+  void slotFileSignCustom();
+
+  /**
+   * @details Open dialog for verifying file.
+   */
+  void slotFileVerifyCustom();
+
+  /**
+   * @details Show the details of the first of the first of selected keys
+   */
+  void slotShowKeyDetails();
+
+  /**
+   * @details Refresh key information of selected keys from default keyserver
+   */
+  void refreshKeysFromKeyserver();
+
+  /**
+   * @details upload the selected key to the keyserver
+   */
+  void uploadKeyToServer();
+
+  /**
+   * @details Open find widget.
+   */
+  void slotFind();
+
+  /**
+   * @details start the wizard
+   */
+  void slotStartWizard();
+
+  /**
+   * @details Import keys from currently active tab to keylist if possible.
+   */
+  void slotImportKeyFromEdit();
+
+  /**
+   * @details Append the selected keys to currently active textedit.
+   */
+  void slotAppendSelectedKeys();
+
+  /**
+   * @details Copy the mailaddress of selected key to clipboard.
+   * Method for keylists contextmenu.
+   */
+  void slotCopyMailAddressToClipboard();
+
+  /**
+   * @details Open key management dialog.
+   */
+  void slotOpenKeyManagement();
+
+  /**
+   * @details Open about-dialog.
+   */
+  void slotAbout();
+
+  /**
+   * @details Open check-update-tab in about-dialog.
+   */
+  void slotCheckUpdate();
+
+  /**
+   * @details Open File Opera Tab
+   */
+  void slotOpenFileTab();
+
+  /**
+   * @details Open settings-dialog.
+   */
+  void slotOpenSettingsDialog();
+
+  //  /**
+  //   * @details Show a warn message in status bar, if there are files in
+  //   * attachment folder.
+  //   */
+  //  void slotCheckAttachmentFolder();
+
+  /**
+   * @details Replace double linebreaks by single linebreaks in currently active
+   * tab.
+   */
+  void slotCleanDoubleLinebreaks();
+
+  /**
+   * @details Cut the existing PGP header and footer from current tab.
+   */
+  void slotCutPgpHeader();
+
+  /**
+   * @details Add PGP header and footer to current tab.
+   */
+  void slotAddPgpHeader();
+
+  /**
+   * @details Disable tab related actions, if number of tabs is 0.
+   * @param number number of the opened tabs and -1, if no tab is opened
+   */
+  void slotDisableTabActions(int number);
+
+  /**
+   * @details get value of member restartNeeded to needed.
+   * @param needed true, if application has to be restarted
+   */
+  void slotSetRestartNeeded(bool needed);
+
+  /**
+   * @details called when need to upgrade.
+   */
+  void slotVersionUpgrade(const QString& currentVersion,
+                          const QString& latestVersion);
+
+ private:
+  /**
+   * @details Create actions for the main-menu and the context-menu of the
+   * keylist.
+   */
+  void createActions();
+
+  /**
+   * @details create the menu of the main-window.
+   */
+  void createMenus();
+
+  /**
+   * @details Create edit-, crypt- and key-toolbars.
+   */
+  void createToolBars();
+
+  /**
+   * @details Create statusbar of mainwindow.
+   */
+  void createStatusBar();
+
+  /**
+   * @details Create keylist- and attachment-dockwindows.
+   */
+  void createDockWindows();
+
+  /**
+   * @details Create attachment-dockwindow.
+   */
+  void createAttachmentDock();
+
+  /**
+   * @details close attachment-dockwindow.
+   */
+  void closeAttachmentDock();
+
+  /**
+   * @details Load settings from ini-file.
+   */
+  void restoreSettings();
+
+  /**
+   * @details Save settings to ini-file.
+   */
+  void saveSettings();
+
+#ifdef ADVANCE_SUPPORT
+
+  /**
+   * @details Get full crypto text
+   */
+  QString getCryptText(const QString& shortenCryptoText);
+
+  /**
+   * @details Shorten crypto text
+   */
+  void shortenCryptText();
+
+#endif
+
+  /**
+   * @brief return true, if restart is needed
+   */
+  [[nodiscard]] bool getRestartNeeded() const;
+
+  TextEdit* edit{};               /** Tabwidget holding the edit-windows */
+  QMenu* fileMenu{};              /** Submenu for file-operations*/
+  QMenu* editMenu{};              /** Submenu for text-operations*/
+  QMenu* cryptMenu{};             /** Submenu for crypt-operations */
+  QMenu* fileEncMenu{};           /** Submenu for file crypt operations */
+  QMenu* helpMenu{};              /** Submenu for help-operations */
+  QMenu* keyMenu{};               /** Submenu for key-operations */
+  QMenu* viewMenu{};              /** Submenu for view operations */
+  QMenu* importKeyMenu{};         /** Sumenu for import operations */
+  QMenu* steganoMenu{};           /** Submenu for steganographic operations*/
+  QToolBar* cryptToolBar{};       /** Toolbar holding crypt actions */
+  QToolBar* fileToolBar{};        /** Toolbar holding file actions */
+  QToolBar* editToolBar{};        /** Toolbar holding edit actions */
+  QToolBar* specialEditToolBar{}; /** Toolbar holding special edit actions */
+  QToolBar* keyToolBar{};         /** Toolbar holding key operations */
+  QToolButton*
+      importButton{}; /** Toolbutton for import dropdown menu in toolbar */
+  QToolButton* fileEncButton{};  /** Toolbutton for file cryption dropdown menu
+                                  in  toolbar */
+  QDockWidget* keyListDock{};    /** Encrypt Dock*/
+  QDockWidget* attachmentDock{}; /** Attachment Dock */
+  QDockWidget* infoBoardDock{};
+
+  QAction* newTabAct{};            /** Action to create new tab */
+  QAction* switchTabUpAct{};       /** Action to switch tab up*/
+  QAction* switchTabDownAct{};     /** Action to switch tab down */
+  QAction* openAct{};              /** Action to open file */
+  QAction* browserAct{};           /** Action to open file browser*/
+  QAction* saveAct{};              /** Action to save file */
+  QAction* saveAsAct{};            /** Action to save file as */
+  QAction* printAct{};             /** Action to print */
+  QAction* closeTabAct{};          /** Action to print */
+  QAction* quitAct{};              /** Action to quit application */
+  QAction* encryptAct{};           /** Action to encrypt text */
+  QAction* encryptSignAct{};       /** Action to encrypt and sign text */
+  QAction* decryptVerifyAct{};     /** Action to encrypt and sign text */
+  QAction* decryptAct{};           /** Action to decrypt text */
+  QAction* signAct{};              /** Action to sign text */
+  QAction* verifyAct{};            /** Action to verify text */
+  QAction* importKeyFromEditAct{}; /** Action to import key from edit */
+  QAction*
+      cleanDoubleLinebreaksAct{}; /** Action to remove double line breaks */
+
+  QAction*
+      appendSelectedKeysAct{}; /** Action to append selected keys to edit */
+  QAction*
+      copyMailAddressToClipboardAct{}; /** Action to copy mail to clipboard */
+  QAction* openKeyManagementAct{};     /** Action to open key management */
+  QAction* copyAct{};                  /** Action to copy text */
+  QAction* quoteAct{};                 /** Action to quote text */
+  QAction* cutAct{};                   /** Action to cut text */
+  QAction* pasteAct{};                 /** Action to paste text */
+  QAction* selectAllAct{};             /** Action to select whole text */
+  QAction* findAct{};                  /** Action to find text */
+  QAction* undoAct{};                  /** Action to undo last action */
+  QAction* redoAct{};                  /** Action to redo last action */
+  QAction* zoomInAct{};                /** Action to zoom in */
+  QAction* zoomOutAct{};               /** Action to zoom out */
+  QAction* aboutAct{};                 /** Action to open about dialog */
+  QAction* checkUpdateAct{};           /** Action to open about dialog */
+  QAction* fileEncryptAct{};    /** Action to open dialog for encrypting file */
+  QAction* fileDecryptAct{};    /** Action to open dialog for decrypting file */
+  QAction* fileSignAct{};       /** Action to open dialog for signing file */
+  QAction* fileVerifyAct{};     /** Action to open dialog for verifying file */
+  QAction* openSettingsAct{};   /** Action to open settings dialog */
+  QAction* showKeyDetailsAct{}; /** Action to open key-details dialog */
+  QAction* refreshKeysFromKeyserverAct{}; /** Action to refresh a key from
+                                             keyserver */
+  QAction* uploadKeyToServerAct{}; /** Action to append selected keys to edit */
+  QAction* startWizardAct{};       /** Action to open the wizard */
+  QAction* cutPgpHeaderAct{};      /** Action for cutting the PGP header */
+  QAction* addPgpHeaderAct{};      /** Action for adding the PGP header */
+
+  QAction* importKeyFromFileAct{};
+  QAction* importKeyFromClipboardAct{};
+  QAction* importKeyFromKeyServerAct{};
+
+  QLabel* statusBarIcon{}; /**< TODO */
+
+  KeyList* mKeyList{};
+  InfoBoardWidget* infoBoard{};
+
+  QNetworkAccessManager* networkAccessManager{};
+
+  bool attachmentDockCreated{};
+  bool restartNeeded{};
+};
+
+}  // namespace GpgFrontend::UI
+
+#endif  // __GPGWIN_H__