Project structure adjustment;

Project configuration adjustment;
Add version detection;
UI interface improvements;
Introduce JSON processing library;
Update Documents;

14 files changed, 526 insertions, 298 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index deeabadb..eadce626 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -44,6 +44,7 @@ add_custom_target(translations DEPENDS ${QON_QM_FILES})
 
 # Set Build Information
 configure_file(${CMAKE_SOURCE_DIR}/include/GpgFrontend.h.in ${CMAKE_SOURCE_DIR}/include/GpgFrontend.h @ONLY)
+configure_file(${CMAKE_SOURCE_DIR}/include/GpgFrontendBuildInfo.h.in ${CMAKE_SOURCE_DIR}/include/GpgFrontendBuildInfo.h @ONLY)
 
 # Copy Resource Files
 file(COPY ${CMAKE_SOURCE_DIR}/resource/css DESTINATION ${RESOURCE_OUTPUT_DIRECTORY}/ FOLLOW_SYMLINK_CHAIN)
diff --git a/src/MainWindow.cpp b/src/MainWindow.cpp
index eeedad7c..08433da9 100644
--- a/src/MainWindow.cpp
+++ b/src/MainWindow.cpp
@@ -23,209 +23,223 @@
  */
 
 #include "MainWindow.h"
+#include "ui/help/VersionCheckThread.h"
 
 MainWindow::MainWindow()
-    : appPath(qApp->applicationDirPath()),
-      settings(RESOURCE_DIR(appPath) + "/conf/gpgfrontend.ini",
-               QSettings::IniFormat) {
-
-  auto waitingDialog = new WaitingDialog("Loading Gnupg", this);
-
-  auto ctx_thread = QThread::create([&]() { mCtx = new GpgME::GpgContext(); });
-
-  ctx_thread->start();
-
-  while (ctx_thread->isRunning())
-    QApplication::processEvents();
-
-  waitingDialog->close();
-
-
-  if (!mCtx->isGood()) {
-    QMessageBox::critical(
-        nullptr, tr("ENV Loading Failed"),
-        tr("Gnupg is not installed correctly, please follow the ReadME "
-           "instructions to install gnupg and then open GPGFrontend."));
-    QCoreApplication::quit();
-    exit(0);
-  }
-
-  /* get path were app was started */
-  setCorner(Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);
-  setCorner(Qt::BottomRightCorner, Qt::RightDockWidgetArea);
-
-  qDebug() << "Main Window" << this;
-
-  edit = new TextEdit(this);
-  setCentralWidget(edit);
-
-  /* the list of Keys available*/
-  mKeyList = new KeyList(mCtx, KeyListRow::SECRET_OR_PUBLIC_KEY,
-                         KeyListColumn::TYPE | KeyListColumn::NAME |
-                             KeyListColumn::EmailAddress |
-                             KeyListColumn::Usage | KeyListColumn::Validity,
-                         this);
-  mKeyList->setFilter([](const GpgKey &key) -> bool {
-    if (key.revoked || key.disabled || key.expired)
-      return false;
-    else
-      return true;
-  });
-  mKeyList->slotRefresh();
-
-  infoBoard = new InfoBoardWidget(this, mCtx, mKeyList);
-
-  /* List of binary Attachments */
-  attachmentDockCreated = false;
-
-  /* Variable containing if restart is needed */
-  this->slotSetRestartNeeded(false);
-
-  keyMgmt = new KeyMgmt(mCtx, this);
-  keyMgmt->hide();
-  /* test attachmentdir for files alll 15s */
-  auto *timer = new QTimer(this);
-  connect(timer, SIGNAL(timeout()), this, SLOT(slotCheckAttachmentFolder()));
-  timer->start(5000);
-
-  createActions();
-  createMenus();
-  createToolBars();
-  createStatusBar();
-  createDockWindows();
-
-  connect(edit->tabWidget, SIGNAL(currentChanged(int)), this,
-          SLOT(slotDisableTabActions(int)));
-
-  mKeyList->addMenuAction(appendSelectedKeysAct);
-  mKeyList->addMenuAction(copyMailAddressToClipboardAct);
-  mKeyList->addMenuAction(showKeyDetailsAct);
-  mKeyList->addSeparator();
-  mKeyList->addMenuAction(refreshKeysFromKeyserverAct);
-  mKeyList->addMenuAction(uploadKeyToServerAct);
-
-  restoreSettings();
-
-  // open filename if provided as first command line parameter
-  QStringList args = qApp->arguments();
-  if (args.size() > 1) {
-    if (!args[1].startsWith("-")) {
-      if (QFile::exists(args[1]))
-        edit->loadFile(args[1]);
+        : appPath(qApp->applicationDirPath()),
+          settings(RESOURCE_DIR(appPath) + "/conf/gpgfrontend.ini",
+                   QSettings::IniFormat) {
+
+    networkAccessManager = new QNetworkAccessManager(this);
+
+    auto waitingDialog = new WaitingDialog("Loading Gnupg", this);
+
+    // Init Gnupg
+    auto ctx_thread = QThread::create([&]() { mCtx = new GpgME::GpgContext(); });
+    ctx_thread->start();
+    while (ctx_thread->isRunning())
+        QApplication::processEvents();
+    waitingDialog->close();
+    ctx_thread->deleteLater();
+
+    QString baseUrl = "https://api.github.com/repos/saturneric/gpgfrontend/releases/latest";
+
+    QNetworkRequest request;
+    request.setUrl(QUrl(baseUrl));
+
+    QNetworkReply *replay = networkAccessManager->get(request);
+
+    auto version_thread = new VersionCheckThread(replay);
+
+    connect(version_thread, SIGNAL(finished(QPrivateSignal)), version_thread, SLOT(deleteLater()));
+    connect(version_thread, SIGNAL(upgradeVersion(const QString &, const QString &)), this, SLOT(slotVersionUpgrade(const QString &, const QString &)));
+
+    version_thread->start();
+
+    // Check Context Status
+    if (!mCtx->isGood()) {
+        QMessageBox::critical(
+                nullptr, tr("ENV Loading Failed"),
+                tr("Gnupg is not installed correctly, please follow the ReadME "
+                   "instructions to install gnupg and then open GPGFrontend."));
+        QCoreApplication::quit();
+        exit(0);
+    }
+
+    /* get path were app was started */
+    setCorner(Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);
+    setCorner(Qt::BottomRightCorner, Qt::RightDockWidgetArea);
+
+    edit = new TextEdit(this);
+    setCentralWidget(edit);
+
+    /* the list of Keys available*/
+    mKeyList = new KeyList(mCtx, KeyListRow::SECRET_OR_PUBLIC_KEY,
+                           KeyListColumn::TYPE | KeyListColumn::NAME |
+                           KeyListColumn::EmailAddress |
+                           KeyListColumn::Usage | KeyListColumn::Validity,
+                           this);
+    mKeyList->setFilter([](const GpgKey &key) -> bool {
+        if (key.revoked || key.disabled || key.expired)
+            return false;
+        else
+            return true;
+    });
+    mKeyList->slotRefresh();
+
+    infoBoard = new InfoBoardWidget(this, mCtx, mKeyList);
+
+    /* List of binary Attachments */
+    attachmentDockCreated = false;
+
+    /* Variable containing if restart is needed */
+    this->slotSetRestartNeeded(false);
+
+    keyMgmt = new KeyMgmt(mCtx, this);
+    keyMgmt->hide();
+    /* test attachmentdir for files alll 15s */
+    auto *timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(slotCheckAttachmentFolder()));
+    timer->start(5000);
+
+    createActions();
+    createMenus();
+    createToolBars();
+    createStatusBar();
+    createDockWindows();
+
+    connect(edit->tabWidget, SIGNAL(currentChanged(int)), this,
+            SLOT(slotDisableTabActions(int)));
+
+    mKeyList->addMenuAction(appendSelectedKeysAct);
+    mKeyList->addMenuAction(copyMailAddressToClipboardAct);
+    mKeyList->addMenuAction(showKeyDetailsAct);
+    mKeyList->addSeparator();
+    mKeyList->addMenuAction(refreshKeysFromKeyserverAct);
+    mKeyList->addMenuAction(uploadKeyToServerAct);
+
+    restoreSettings();
+
+    // open filename if provided as first command line parameter
+    QStringList args = qApp->arguments();
+    if (args.size() > 1) {
+        if (!args[1].startsWith("-")) {
+            if (QFile::exists(args[1]))
+                edit->loadFile(args[1]);
+        }
+    }
+    edit->curTextPage()->setFocus();
+    this->setMinimumSize(1200, 700);
+    this->setWindowTitle(qApp->applicationName());
+    this->show();
+
+    // Show wizard, if the don't show wizard message box wasn't checked
+    // and keylist doesn't contain a private key
+    qDebug() << "wizard/showWizard"
+             << settings.value("wizard/showWizard", true).toBool();
+    qDebug() << "wizard/nextPage" << settings.value("wizard/nextPage").isNull();
+    if (settings.value("wizard/showWizard", true).toBool() ||
+        !settings.value("wizard/nextPage").isNull()) {
+        slotStartWizard();
     }
-  }
-  edit->curTextPage()->setFocus();
-  this->setMinimumSize(1200, 700);
-  this->setWindowTitle(qApp->applicationName());
-  this->show();
-
-  // Show wizard, if the don't show wizard message box wasn't checked
-  // and keylist doesn't contain a private key
-  qDebug() << "wizard/showWizard"
-           << settings.value("wizard/showWizard", true).toBool();
-  qDebug() << "wizard/nextPage" << settings.value("wizard/nextPage").isNull();
-  if (settings.value("wizard/showWizard", true).toBool() ||
-      !settings.value("wizard/nextPage").isNull()) {
-    slotStartWizard();
-  }
 
 }
 
 void MainWindow::restoreSettings() {
-  // state sets pos & size of dock-widgets
-  this->restoreState(settings.value("window/windowState").toByteArray());
-
-  // Restore window size & location
-  if (settings.value("window/windowSave").toBool()) {
-    QPoint pos = settings.value("window/pos", QPoint(100, 100)).toPoint();
-    QSize size = settings.value("window/size", QSize(800, 450)).toSize();
-    this->resize(size);
-    this->move(pos);
-  } else {
-    this->resize(QSize(800, 450));
-    this->move(QPoint(100, 100));
-  }
-
-  // Iconsize
-  QSize iconSize = settings.value("toolbar/iconsize", QSize(24, 24)).toSize();
-  this->setIconSize(iconSize);
-
-  importButton->setIconSize(iconSize);
-  fileEncButton->setIconSize(iconSize);
-  // set list of keyserver if not defined
-  QStringList *keyServerDefaultList;
-  keyServerDefaultList = new QStringList("http://keys.gnupg.net");
-  keyServerDefaultList->append("https://keyserver.ubuntu.com");
-  keyServerDefaultList->append("http://pool.sks-keyservers.net");
-
-  QStringList keyServerList =
-      settings.value("keyserver/keyServerList", *keyServerDefaultList)
-          .toStringList();
-  settings.setValue("keyserver/keyServerList", keyServerList);
-
-  // set default keyserver, if it's not set
-  QString defaultKeyServer = settings
-                                 .value("keyserver/defaultKeyServer",
-                                        QString("https://keyserver.ubuntu.com"))
-                                 .toString();
-  settings.setValue("keyserver/defaultKeyServer", defaultKeyServer);
-
-  // Iconstyle
-  Qt::ToolButtonStyle buttonStyle = static_cast<Qt::ToolButtonStyle>(
-      settings.value("toolbar/iconstyle", Qt::ToolButtonTextUnderIcon)
-          .toUInt());
-  this->setToolButtonStyle(buttonStyle);
-  importButton->setToolButtonStyle(buttonStyle);
-  fileEncButton->setToolButtonStyle(buttonStyle);
-
-  // Checked Keys
-  if (settings.value("keys/saveKeyChecked").toBool()) {
-    QStringList keyIds =
-        settings.value("keys/savedCheckedKeyList").toStringList();
-    mKeyList->setChecked(&keyIds);
-  }
+    // state sets pos & size of dock-widgets
+    this->restoreState(settings.value("window/windowState").toByteArray());
+
+    // Restore window size & location
+    if (settings.value("window/windowSave").toBool()) {
+        QPoint pos = settings.value("window/pos", QPoint(100, 100)).toPoint();
+        QSize size = settings.value("window/size", QSize(800, 450)).toSize();
+        this->resize(size);
+        this->move(pos);
+    } else {
+        this->resize(QSize(800, 450));
+        this->move(QPoint(100, 100));
+    }
+
+    // Iconsize
+    QSize iconSize = settings.value("toolbar/iconsize", QSize(24, 24)).toSize();
+    this->setIconSize(iconSize);
+
+    importButton->setIconSize(iconSize);
+    fileEncButton->setIconSize(iconSize);
+    // set list of keyserver if not defined
+    QStringList *keyServerDefaultList;
+    keyServerDefaultList = new QStringList("http://keys.gnupg.net");
+    keyServerDefaultList->append("https://keyserver.ubuntu.com");
+    keyServerDefaultList->append("http://pool.sks-keyservers.net");
+
+    QStringList keyServerList =
+            settings.value("keyserver/keyServerList", *keyServerDefaultList)
+                    .toStringList();
+    settings.setValue("keyserver/keyServerList", keyServerList);
+
+    // set default keyserver, if it's not set
+    QString defaultKeyServer = settings
+            .value("keyserver/defaultKeyServer",
+                   QString("https://keyserver.ubuntu.com"))
+            .toString();
+    settings.setValue("keyserver/defaultKeyServer", defaultKeyServer);
+
+    // Iconstyle
+    Qt::ToolButtonStyle buttonStyle = static_cast<Qt::ToolButtonStyle>(
+            settings.value("toolbar/iconstyle", Qt::ToolButtonTextUnderIcon)
+                    .toUInt());
+    this->setToolButtonStyle(buttonStyle);
+    importButton->setToolButtonStyle(buttonStyle);
+    fileEncButton->setToolButtonStyle(buttonStyle);
+
+    // Checked Keys
+    if (settings.value("keys/saveKeyChecked").toBool()) {
+        QStringList keyIds =
+                settings.value("keys/savedCheckedKeyList").toStringList();
+        mKeyList->setChecked(&keyIds);
+    }
 }
 
 void MainWindow::saveSettings() {
-  // window position and size
-  settings.setValue("window/windowState", saveState());
-  settings.setValue("window/pos", pos());
-  settings.setValue("window/size", size());
-
-  // keyid-list of private checked keys
-  if (settings.value("keys/saveKeyChecked").toBool()) {
-    QStringList *keyIds = mKeyList->getChecked();
-    if (!keyIds->isEmpty()) {
-      settings.setValue("keys/savedCheckedKeyList", *keyIds);
+    // window position and size
+    settings.setValue("window/windowState", saveState());
+    settings.setValue("window/pos", pos());
+    settings.setValue("window/size", size());
+
+    // keyid-list of private checked keys
+    if (settings.value("keys/saveKeyChecked").toBool()) {
+        QStringList *keyIds = mKeyList->getChecked();
+        if (!keyIds->isEmpty()) {
+            settings.setValue("keys/savedCheckedKeyList", *keyIds);
+        } else {
+            settings.setValue("keys/savedCheckedKeyList", "");
+        }
     } else {
-      settings.setValue("keys/savedCheckedKeyList", "");
+        settings.remove("keys/savedCheckedKeyList");
     }
-  } else {
-    settings.remove("keys/savedCheckedKeyList");
-  }
 }
 
 void MainWindow::closeAttachmentDock() {
-  if (!attachmentDockCreated) {
-    return;
-  }
-  attachmentDock->close();
-  attachmentDock->deleteLater();
-  attachmentDockCreated = false;
+    if (!attachmentDockCreated) {
+        return;
+    }
+    attachmentDock->close();
+    attachmentDock->deleteLater();
+    attachmentDockCreated = false;
 }
 
 void MainWindow::closeEvent(QCloseEvent *event) {
-  /*
-   * ask to save changes, if there are
-   * modified documents in any tab
-   */
-  if (edit->maybeSaveAnyTab()) {
-    saveSettings();
-    event->accept();
-  } else {
-    event->ignore();
-  }
-
-  // clear password from memory
-  mCtx->clearPasswordCache();
+    /*
+     * ask to save changes, if there are
+     * modified documents in any tab
+     */
+    if (edit->maybeSaveAnyTab()) {
+        saveSettings();
+        event->accept();
+    } else {
+        event->ignore();
+    }
+
+    // clear password from memory
+    mCtx->clearPasswordCache();
 }
diff --git a/src/main.cpp b/src/main.cpp
index 00ab2738..3e14a425 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -23,6 +23,7 @@
  */
 
 #include "MainWindow.h"
+#include "GpgFrontendBuildInfo.h"
 
 int main(int argc, char *argv[]) {
 
diff --git a/src/ui/AboutDialog.cpp b/src/ui/AboutDialog.cpp
deleted file mode 100644
index e51f225d..00000000
--- a/src/ui/AboutDialog.cpp
+++ /dev/null
@@ -1,94 +0,0 @@
-/**
- * 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.
- *
- */
-
-#include "ui/AboutDialog.h"
-
-AboutDialog::AboutDialog(QWidget *parent)
-        : QDialog(parent) {
-    this->setWindowTitle(tr("About ") + qApp->applicationName());
-
-    auto *tabWidget = new QTabWidget;
-    auto *infoTab = new InfoTab;
-    auto *translatorsTab = new TranslatorsTab;
-
-    tabWidget->addTab(infoTab, tr("General"));
-    tabWidget->addTab(translatorsTab, tr("Translators"));
-
-    auto *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok);
-    connect(buttonBox, SIGNAL(accepted()), this, SLOT(close()));
-
-    auto *mainLayout = new QVBoxLayout;
-    mainLayout->addWidget(tabWidget);
-    mainLayout->addWidget(buttonBox);
-    setLayout(mainLayout);
-
-    this->exec();
-}
-
-InfoTab::InfoTab(QWidget *parent)
-        : QWidget(parent) {
-    auto *pixmap = new QPixmap(":gpgfrontend-logo.png");
-    auto *text = new QString("<center><h2>" + qApp->applicationName() + "</h2></center>"
-                             + "<center><b>" + qApp->applicationVersion() + "</b></center>"
-                             + "<center>" + GIT_VERSION + "</center>"
-                             + tr("<br><center>GPGFrontend is an easy-to-use, compact, <br>"
-                                  "cross-platform, and installation-free gpg front-end tool.<br>"
-                                  "It visualizes most of the common operations of gpg commands.<br>"
-                                  "It's licensed under the GPL v3<br><br>"
-                                  "<b>Developer:</b><br>"
-                                  "Saturneric<br><br>"
-                                  "If you have any questions or suggestions, raise an issue<br/>"
-                                  "at <a href=\"https://github.com/saturneric/GpgFrontend\">GitHub</a> or send a mail to my mailing list at <a href=\"mailto:[email protected]\">[email protected]</a>.") +
-                             tr("<br><br> Built with Qt ") + qVersion()
-                             + tr(" and GPGME ") + GpgME::GpgContext::getGpgmeVersion() +
-                             tr("<br>Built at ") + BUILD_TIMESTAMP + "</center>");
-
-    auto *layout = new QGridLayout();
-    auto *pixmapLabel = new QLabel();
-    pixmapLabel->setPixmap(*pixmap);
-    layout->addWidget(pixmapLabel, 0, 0, 1, -1, Qt::AlignCenter);
-    auto *aboutLabel = new QLabel();
-    aboutLabel->setText(*text);
-    aboutLabel->setOpenExternalLinks(true);
-    layout->addWidget(aboutLabel, 1, 0, 1, -1);
-    layout->addItem(new QSpacerItem(20, 10, QSizePolicy::Minimum,
-                                    QSizePolicy::Fixed), 2, 1, 1, 1);
-
-    setLayout(layout);
-}
-
-TranslatorsTab::TranslatorsTab(QWidget *parent)
-        : QWidget(parent) {
-    QFile translatorsFile;
-    translatorsFile.setFileName(qApp->applicationDirPath() + "/About");
-    translatorsFile.open(QIODevice::ReadOnly);
-    QByteArray inBuffer = translatorsFile.readAll();
-
-    auto *label = new QLabel(inBuffer);
-    auto *mainLayout = new QVBoxLayout(this);
-    mainLayout->addWidget(label);
-
-    setLayout(mainLayout);
-}
-
diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
index 68f57b81..618b5d28 100644
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -3,6 +3,7 @@ aux_source_directory(./keypair_details UI_SOURCE)
 aux_source_directory(./widgets UI_SOURCE)
 aux_source_directory(./keygen UI_SOURCE)
 aux_source_directory(./main_window UI_SOURCE)
+aux_source_directory(./help UI_SOURCE)
 
 add_library(gpgfrontend-ui STATIC ${UI_SOURCE})
 
diff --git a/src/ui/help/AboutDialog.cpp b/src/ui/help/AboutDialog.cpp
new file mode 100644
index 00000000..4c9b54c9
--- /dev/null
+++ b/src/ui/help/AboutDialog.cpp
@@ -0,0 +1,208 @@
+/**
+ * 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.
+ *
+ */
+
+#include "ui/help/AboutDialog.h"
+#include "GpgFrontendBuildInfo.h"
+
+#include "rapidjson/document.h"
+#include "rapidjson/writer.h"
+
+using namespace rapidjson;
+
+AboutDialog::AboutDialog(int defaultIndex, QWidget *parent)
+        : QDialog(parent) {
+    this->setWindowTitle(tr("About ") + qApp->applicationName());
+
+    auto *tabWidget = new QTabWidget;
+    auto *infoTab = new InfoTab();
+    auto *translatorsTab = new TranslatorsTab();
+    auto *updateTab = new UpdateTab();
+
+    tabWidget->addTab(infoTab, tr("General"));
+    tabWidget->addTab(translatorsTab, tr("Translators"));
+    tabWidget->addTab(updateTab, tr("Update"));
+
+    connect(tabWidget, &QTabWidget::currentChanged, this, [&](int index) {
+        qDebug() << "Current Index" << index;
+        if(index == 2) {
+            updateTab->getLatestVersion();
+        }
+    });
+
+    if(defaultIndex < tabWidget->count() && defaultIndex >= 0) {
+        tabWidget->setCurrentIndex(defaultIndex);
+    }
+
+    auto *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok);
+    connect(buttonBox, SIGNAL(accepted()), this, SLOT(close()));
+
+    auto *mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(tabWidget);
+    mainLayout->addWidget(buttonBox);
+    setLayout(mainLayout);
+
+    this->exec();
+}
+
+InfoTab::InfoTab(QWidget *parent)
+        : QWidget(parent) {
+    auto *pixmap = new QPixmap(":gpgfrontend-logo.png");
+    auto *text = new QString("<center><h2>" + qApp->applicationName() + "</h2></center>"
+                             + "<center><b>" + qApp->applicationVersion() + "</b></center>"
+                             + "<center>" + GIT_VERSION + "</center>"
+                             + tr("<br><center>GPGFrontend is an easy-to-use, compact, cross-platform, <br>"
+                                  "and installation-free gpg front-end tool.<br>"
+                                  "It visualizes most of the common operations of gpg commands.<br>"
+                                  "It's licensed under the GPL v3<br><br>"
+                                  "<b>Developer:</b><br>"
+                                  "Saturneric<br><br>"
+                                  "If you have any questions or suggestions, raise an issue<br/>"
+                                  "at <a href=\"https://github.com/saturneric/GpgFrontend\">GitHub</a> or send a mail to my mailing list at <a href=\"mailto:[email protected]\">[email protected]</a>.") +
+                             tr("<br><br> Built with Qt ") + qVersion()
+                             + tr(" and GPGME ") + GpgME::GpgContext::getGpgmeVersion() +
+                             tr("<br>Built at ") + BUILD_TIMESTAMP + "</center>");
+
+    auto *layout = new QGridLayout();
+    auto *pixmapLabel = new QLabel();
+    pixmapLabel->setPixmap(*pixmap);
+    layout->addWidget(pixmapLabel, 0, 0, 1, -1, Qt::AlignCenter);
+    auto *aboutLabel = new QLabel();
+    aboutLabel->setText(*text);
+    aboutLabel->setOpenExternalLinks(true);
+    layout->addWidget(aboutLabel, 1, 0, 1, -1);
+    layout->addItem(new QSpacerItem(20, 10, QSizePolicy::Minimum,
+                                    QSizePolicy::Fixed), 2, 1, 1, 1);
+
+    setLayout(layout);
+}
+
+TranslatorsTab::TranslatorsTab(QWidget *parent)
+        : QWidget(parent) {
+    QFile translatorsFile;
+    translatorsFile.setFileName(qApp->applicationDirPath() + "/About");
+    translatorsFile.open(QIODevice::ReadOnly);
+    QByteArray inBuffer = translatorsFile.readAll();
+
+    auto *label = new QLabel(inBuffer);
+    auto *mainLayout = new QVBoxLayout(this);
+    mainLayout->addWidget(label);
+
+    setLayout(mainLayout);
+}
+
+UpdateTab::UpdateTab(QWidget *parent) {
+    auto *pixmap = new QPixmap(":gpgfrontend-logo.png");
+    auto *layout = new QGridLayout();
+    auto *pixmapLabel = new QLabel();
+    pixmapLabel->setPixmap(*pixmap);
+    layout->addWidget(pixmapLabel, 0, 0, 1, -1, Qt::AlignCenter);
+
+    currentVersion = "v" + QString::number(VERSION_MAJOR) + "."
+                     + QString::number(VERSION_MINOR) + "."
+                     + QString::number(VERSION_PATCH);
+
+    auto tipsLabel = new QLabel();
+    tipsLabel->setText("<center>" +
+        tr("It is recommended that you always check the version of GpgFrontend and upgrade to the latest version.") +
+        "</center><br><center>" +
+        tr("New versions not only represent new features, but also often represent functional and security fixes.") + "</center>");
+    tipsLabel->setWordWrap(true);
+
+    currentVersionLabel = new QLabel();
+    currentVersionLabel->setText("<center>" + tr("Current Version: ") + "<b>" + currentVersion + "</b></center>");
+    currentVersionLabel->setWordWrap(true);
+
+    latestVersionLabel = new QLabel();
+    latestVersionLabel->setWordWrap(true);
+
+    upgradeLabel = new QLabel();
+    upgradeLabel->setText("<center>" +
+                       tr("The current version is inconsistent with the latest version on github.") +
+                       "</center><br><center>" +
+                       tr("Please click <a href=\"https://github.com/saturneric/GpgFrontend/releases\">here</a> to download the latest version.") + "</center>");
+    upgradeLabel->setWordWrap(true);
+    upgradeLabel->setOpenExternalLinks(true);
+    upgradeLabel->setHidden(true);
+
+    pb = new QProgressBar();
+    pb->setRange(0, 0);
+    pb->setTextVisible(false);
+
+    layout->addWidget(tipsLabel, 1, 0, 1, -1);
+    layout->addWidget(currentVersionLabel, 2, 0, 1, -1);
+    layout->addWidget(latestVersionLabel, 3, 0, 1, -1);
+    layout->addWidget(upgradeLabel, 4, 0, 1, -1);
+    layout->addWidget(pb, 5, 0, 1, -1);
+    layout->addItem(new QSpacerItem(20, 10, QSizePolicy::Minimum,
+                                    QSizePolicy::Fixed), 2, 1, 1, 1);
+
+    setLayout(layout);
+}
+
+void UpdateTab::getLatestVersion() {
+
+    this->pb->setHidden(false);
+
+    qDebug() << "Try to get latest version";
+
+    QString baseUrl = "https://api.github.com/repos/saturneric/gpgfrontend/releases/latest";
+
+    auto manager = new QNetworkAccessManager(this);
+
+    QNetworkRequest request;
+    request.setUrl(QUrl(baseUrl));
+
+    QNetworkReply *replay = manager->get(request);
+
+    while(replay->isRunning()) {
+        QApplication::processEvents();
+    }
+
+     this->pb->setHidden(true);
+
+     QByteArray bytes = replay->readAll();
+
+    Document d;
+    d.Parse(bytes.constData());
+
+    QString latestVersion = d["tag_name"].GetString();
+
+    qDebug() << "Latest Version From Github" << latestVersion;
+
+    QRegularExpression re("^[vV](\\d+\\.)?(\\d+\\.)?(\\*|\\d+)");
+    QRegularExpressionMatch match = re.match(latestVersion);
+    if (match.hasMatch()) {
+        latestVersion = match.captured(0); // matched == "23 def"
+        qDebug() << "Latest Version Matched" << latestVersion;
+    } else {
+        latestVersion = "Unknown";
+    }
+
+    latestVersionLabel->setText("<center><b>" + tr("Latest Version From Github: ") + latestVersion + "</b></center>");
+
+    if(latestVersion > currentVersion) {
+        upgradeLabel->setHidden(false);
+    }
+
+}
diff --git a/src/ui/help/VersionCheckThread.cpp b/src/ui/help/VersionCheckThread.cpp
new file mode 100644
index 00000000..7bd0eb8f
--- /dev/null
+++ b/src/ui/help/VersionCheckThread.cpp
@@ -0,0 +1,50 @@
+//
+// Created by Administrator on 2021/7/12.
+//
+
+#include "ui/help/VersionCheckThread.h"
+#include "GpgFrontendBuildInfo.h"
+#include "rapidjson/document.h"
+#include "rapidjson/writer.h"
+
+using namespace rapidjson;
+
+void VersionCheckThread::run() {
+    qDebug() << "Start Version Thread to get latest version from Github";
+
+    auto currentVersion = "v" + QString::number(VERSION_MAJOR) + "."
+                          + QString::number(VERSION_MINOR) + "."
+                          + QString::number(VERSION_PATCH);
+
+    while(mNetworkReply->isRunning()) {
+        QApplication::processEvents();
+    }
+
+    QByteArray bytes = mNetworkReply->readAll();
+
+    Document d;
+    d.Parse(bytes.constData());
+
+    QString latestVersion = d["tag_name"].GetString();
+
+    qDebug() << "Latest Version From Github" << latestVersion;
+
+    QRegularExpression re("^[vV](\\d+\\.)?(\\d+\\.)?(\\*|\\d+)");
+    QRegularExpressionMatch match = re.match(latestVersion);
+    if (match.hasMatch()) {
+        latestVersion = match.captured(0); // matched == "23 def"
+        qDebug() << "Latest Version Matched" << latestVersion;
+    } else {
+        latestVersion = currentVersion;
+        qDebug() << "Latest Version Unknown" << latestVersion;
+    }
+
+    if(latestVersion != currentVersion) {
+        emit upgradeVersion(currentVersion, latestVersion);
+    }
+
+}
+
+VersionCheckThread::VersionCheckThread(QNetworkReply *networkReply):mNetworkReply(networkReply) {
+
+}
diff --git a/src/ui/keygen/SubkeyGenerateThread.cpp b/src/ui/keygen/SubkeyGenerateThread.cpp
index 4f19ac1f..125f35f8 100644
--- a/src/ui/keygen/SubkeyGenerateThread.cpp
+++ b/src/ui/keygen/SubkeyGenerateThread.cpp
@@ -24,8 +24,6 @@
 
 #include "ui/keygen/SubkeyGenerateThread.h"
 
-#include <utility>
-
 SubkeyGenerateThread::SubkeyGenerateThread(GpgKey key, GenKeyInfo *keyGenParams, GpgME::GpgContext *ctx)
         : mKey(std::move(key)), keyGenParams(keyGenParams) , mCtx(ctx) {
     connect(this, &SubkeyGenerateThread::finished, this, &SubkeyGenerateThread::deleteLater);
diff --git a/src/ui/main_window/MainWindowSlotFunction.cpp b/src/ui/main_window/MainWindowSlotFunction.cpp
index 21d0af0d..0bddb9b2 100644
--- a/src/ui/main_window/MainWindowSlotFunction.cpp
+++ b/src/ui/main_window/MainWindowSlotFunction.cpp
@@ -58,7 +58,7 @@ void MainWindow::slotEncrypt() {
         auto thread = QThread::create([&]() {
             error = mCtx->encrypt(keys, edit->curTextPage()->toPlainText().toUtf8(), tmp, &result);
         });
-
+        connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
         thread->start();
 
         auto *dialog = new WaitingDialog(tr("Encrypting"), this);
@@ -122,6 +122,7 @@ void MainWindow::slotSign() {
         auto thread = QThread::create([&]() {
             error = mCtx->sign(keys, edit->curTextPage()->toPlainText().toUtf8(), tmp, false, &result);
         });
+        connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
         thread->start();
 
         auto *dialog = new WaitingDialog(tr("Signing"), this);
@@ -165,6 +166,7 @@ void MainWindow::slotDecrypt() {
             // try decrypt, if fail do nothing, especially don't replace text
             error = mCtx->decrypt(text, decrypted, &result);
         });
+        connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
         thread->start();
 
         auto *dialog = new WaitingDialog(tr("Decrypting"), this);
@@ -224,6 +226,7 @@ void MainWindow::slotVerify() {
         auto thread = QThread::create([&]() {
             error = mCtx->verify(&text, nullptr, &result);
         });
+        connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
         thread->start();
 
         auto *dialog = new WaitingDialog(tr("Verifying"), this);
@@ -312,6 +315,7 @@ void MainWindow::slotEncryptSign() {
             error = mCtx->encryptSign(keys, edit->curTextPage()->toPlainText().toUtf8(), tmp, &encr_result,
                                       &sign_result);
         });
+        connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
         thread->start();
 
         auto *dialog = new WaitingDialog(tr("Encrypting and Signing"), this);
@@ -364,6 +368,7 @@ void MainWindow::slotDecryptVerify() {
         auto thread = QThread::create([&]() {
             error = mCtx->decryptVerify(text, decrypted, &d_result, &v_result);
         });
+        connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
         thread->start();
 
         WaitingDialog *dialog = new WaitingDialog(tr("Decrypting and Verifying"), this);
@@ -516,6 +521,7 @@ void MainWindow::slotFileEncrypt() {
             if_error = true;
         }
     });
+    connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
     thread->start();
 
     auto *dialog = new WaitingDialog(tr("Encrypting"), this);
@@ -524,7 +530,7 @@ void MainWindow::slotFileEncrypt() {
     }
 
     dialog->close();
-    if(!if_error) {
+    if (!if_error) {
         auto resultAnalyse = new EncryptResultAnalyse(error, result);
         auto &reportText = resultAnalyse->getResultReport();
         infoBoard->associateTabWidget(edit->tabWidget);
@@ -596,6 +602,7 @@ void MainWindow::slotFileDecrypt() {
             if_error = true;
         }
     });
+    connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
     thread->start();
 
     auto *dialog = new WaitingDialog("Decrypting", this);
@@ -605,7 +612,7 @@ void MainWindow::slotFileDecrypt() {
 
     dialog->close();
 
-    if(!if_error) {
+    if (!if_error) {
         auto resultAnalyse = new DecryptResultAnalyse(mCtx, error, result);
         auto &reportText = resultAnalyse->getResultReport();
         infoBoard->associateTabWidget(edit->tabWidget);
@@ -691,6 +698,7 @@ void MainWindow::slotFileSign() {
             if_error = true;
         }
     });
+    connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
     thread->start();
 
     auto *dialog = new WaitingDialog(tr("Signing"), this);
@@ -700,7 +708,7 @@ void MainWindow::slotFileSign() {
 
     dialog->close();
 
-    if(!if_error) {
+    if (!if_error) {
 
         auto resultAnalyse = new SignResultAnalyse(error, result);
         auto &reportText = resultAnalyse->getResultReport();
@@ -775,6 +783,7 @@ void MainWindow::slotFileVerify() {
             if_error = true;
         }
     });
+    connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
     thread->start();
 
     auto *dialog = new WaitingDialog(tr("Verifying"), this);
@@ -894,6 +903,7 @@ void MainWindow::slotFileEncryptSign() {
             if_error = true;
         }
     });
+    connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
     thread->start();
 
     WaitingDialog *dialog = new WaitingDialog(tr("Encrypting and Signing"), this);
@@ -902,7 +912,7 @@ void MainWindow::slotFileEncryptSign() {
     }
     dialog->close();
 
-    if(!if_error) {
+    if (!if_error) {
 
         auto resultAnalyseEncr = new EncryptResultAnalyse(error, encr_result);
         auto resultAnalyseSign = new SignResultAnalyse(error, sign_result);
@@ -970,15 +980,17 @@ void MainWindow::slotFileDecryptVerify() {
             if_error = true;
         }
     });
+    connect(thread, SIGNAL(finished(QPrivateSignal)), thread, SLOT(deleteLater()));
     thread->start();
 
+
     auto *dialog = new WaitingDialog(tr("Decrypting and Verifying"), this);
     while (thread->isRunning()) {
         QApplication::processEvents();
     }
     dialog->close();
 
-    if(!if_error) {
+    if (!if_error) {
         infoBoard->associateFileTreeView(edit->curFilePage());
 
         auto resultAnalyseDecrypt = new DecryptResultAnalyse(mCtx, error, d_result);
@@ -1036,3 +1048,21 @@ void MainWindow::slotFileVerifyCustom() {
 void MainWindow::slotOpenFile(QString &path) {
     edit->slotOpenFile(path);
 }
+
+void MainWindow::slotVersionUpgrade(const QString &currentVersion, const QString &latestVersion) {
+    if(currentVersion < latestVersion) {
+        QMessageBox::warning(this,
+                             tr("Outdated Version"),
+                             tr("This version(%1) is out of date, please update the latest version in time. ").arg(
+                                     currentVersion)
+                             + tr("You can download the latest version(%1) on Github Releases Page.<br/>").arg(
+                                     latestVersion));
+    } else if(currentVersion > latestVersion) {
+        QMessageBox::warning(this,
+                             tr("Unreleased Version"),
+                             tr("This version(%1) has not been officially released and is not recommended for use in a production environment. <br/>").arg(
+                                     currentVersion)
+                             + tr("You can download the latest version(%1) on Github Releases Page.<br/>").arg(
+                                     latestVersion));
+    }
+}
diff --git a/src/ui/main_window/MainWindowSlotUI.cpp b/src/ui/main_window/MainWindowSlotUI.cpp
index 189ead53..d95a9bfe 100644
--- a/src/ui/main_window/MainWindowSlotUI.cpp
+++ b/src/ui/main_window/MainWindowSlotUI.cpp
@@ -25,7 +25,11 @@
 #include "MainWindow.h"
 
 void MainWindow::slotAbout() {
-    new AboutDialog(this);
+    new AboutDialog(0, this);
+}
+
+void MainWindow::slotCheckUpdate() {
+    new AboutDialog(2, this);
 }
 
 void MainWindow::slotSetStatusBarText(const QString &text) {
diff --git a/src/ui/main_window/MainWindowUI.cpp b/src/ui/main_window/MainWindowUI.cpp
index 01c9fdde..0f7f1040 100644
--- a/src/ui/main_window/MainWindowUI.cpp
+++ b/src/ui/main_window/MainWindowUI.cpp
@@ -209,18 +209,27 @@ void MainWindow::createActions() {
     importKeyFromEditAct->setToolTip(tr("Import New Key From Editor"));
     connect(importKeyFromEditAct, SIGNAL(triggered()), this, SLOT(slotImportKeyFromEdit()));
 
-    openKeyManagementAct = new QAction(tr("Manage &keys"), this);
+    openKeyManagementAct = new QAction(tr("Manage &Keys"), this);
     openKeyManagementAct->setIcon(QIcon(":keymgmt.png"));
     openKeyManagementAct->setToolTip(tr("Open Keymanagement"));
     connect(openKeyManagementAct, SIGNAL(triggered()), this, SLOT(slotOpenKeyManagement()));
 
-    /* About Menu
+    /*
+     * About Menu
      */
     aboutAct = new QAction(tr("&About"), this);
     aboutAct->setIcon(QIcon(":help.png"));
     aboutAct->setToolTip(tr("Show the application's About box"));
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(slotAbout()));
 
+    /*
+     * Check Update Menu
+    */
+    checkUpdateAct = new QAction(tr("&Check for Updates"), this);
+    checkUpdateAct->setIcon(QIcon(":help.png"));
+    checkUpdateAct->setToolTip(tr("Check for updates"));
+    connect(checkUpdateAct, SIGNAL(triggered()), this, SLOT(slotCheckUpdate()));
+
     startWizardAct = new QAction(tr("Open &Wizard"), this);
     startWizardAct->setToolTip(tr("Open the wizard"));
     connect(startWizardAct, SIGNAL(triggered()), this, SLOT(slotStartWizard()));
@@ -340,6 +349,7 @@ void MainWindow::createMenus() {
     helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(startWizardAct);
     helpMenu->addSeparator();
+    helpMenu->addAction(checkUpdateAct);
     helpMenu->addAction(aboutAct);
 
 }
diff --git a/src/ui/widgets/EditorPage.cpp b/src/ui/widgets/EditorPage.cpp
index 8a51b721..05d5cbea 100644
--- a/src/ui/widgets/EditorPage.cpp
+++ b/src/ui/widgets/EditorPage.cpp
@@ -42,6 +42,9 @@ EditorPage::EditorPage(QString filePath, QWidget *parent) : QWidget(parent),
     setAttribute(Qt::WA_DeleteOnClose);
     textPage->setFocus();
 
+    // Front in same width
+    this->setFont({"Courier"});
+
     connect(textPage, SIGNAL(textChanged()), this, SLOT(formatGpgHeader()));
 }
 
diff --git a/src/ui/widgets/FilePage.cpp b/src/ui/widgets/FilePage.cpp
index e330eb68..65755509 100644
--- a/src/ui/widgets/FilePage.cpp
+++ b/src/ui/widgets/FilePage.cpp
@@ -50,11 +50,15 @@ FilePage::FilePage(QWidget *parent) : QWidget(parent) {
     upLevelButton = new QPushButton();
     connect(upLevelButton, SIGNAL(clicked(bool)), this, SLOT(slotUpLevel()));
 
+    QString buttonStyle = "QPushButton{border:none;background-color:rgba(255, 255, 255,100);}";
+
+
     auto upPixmap = QPixmap(":up.png");
     upPixmap = upPixmap.scaled(18, 18, Qt::KeepAspectRatio, Qt::SmoothTransformation);
     QIcon upButtonIcon(upPixmap);
     upLevelButton->setIcon(upButtonIcon);
     upLevelButton->setIconSize(upPixmap.rect().size());
+    upLevelButton->setStyleSheet(buttonStyle);
 
     refreshButton = new QPushButton("Refresh");
     connect(refreshButton, SIGNAL(clicked(bool)), this, SLOT(slotGoPath()));
@@ -67,6 +71,7 @@ FilePage::FilePage(QWidget *parent) : QWidget(parent) {
     QIcon updateButtonIcon(updatePixmap);
     goPathButton->setIcon(updateButtonIcon);
     goPathButton->setIconSize(updatePixmap.rect().size());
+    goPathButton->setStyleSheet(buttonStyle);
 
     pathEdit = new QLineEdit();
     pathEdit->setText(dirModel->rootPath());
@@ -75,7 +80,7 @@ FilePage::FilePage(QWidget *parent) : QWidget(parent) {
     menuLayout->addWidget(upLevelButton);
     menuLayout->setStretchFactor(upLevelButton, 1);
     menuLayout->addWidget(pathEdit);
-    menuLayout->setStretchFactor(pathEdit, 8);
+    menuLayout->setStretchFactor(pathEdit, 10);
     menuLayout->addWidget(goPathButton);
     menuLayout->setStretchFactor(goPathButton, 1);
     // menuLayout->addWidget(refreshButton);
diff --git a/src/ui/widgets/TextEdit.cpp b/src/ui/widgets/TextEdit.cpp
index f06b3a45..c9968565 100644
--- a/src/ui/widgets/TextEdit.cpp
+++ b/src/ui/widgets/TextEdit.cpp
@@ -37,9 +37,6 @@ TextEdit::TextEdit(QWidget *parent) : QWidget(parent) {
   layout->setSpacing(0);
   setLayout(layout);
 
-  // Front in same width
-  this->setFont({"Courier"});
-
   connect(tabWidget, SIGNAL(tabCloseRequested(int)), this,
           SLOT(removeTab(int)));
   connect(this, &TextEdit::insertTargetTextPage, this,
@@ -73,7 +70,7 @@ void TextEdit::slotNewHelpTab(const QString &title, const QString &path) const {
 void TextEdit::slotNewFileTab() const {
 
   auto *page = new FilePage(qobject_cast<QWidget *>(parent()));
-  tabWidget->addTab(page, "[File Browser]");
+  tabWidget->addTab(page, "[Browser]");
   tabWidget->setCurrentIndex(tabWidget->count() - 1);
   connect(page, SIGNAL(pathChanged(const QString &)), this,
           SLOT(slotFilePagePathChanged(const QString &)));
@@ -646,7 +643,7 @@ void TextEdit::slotFilePagePathChanged(const QString &path) {
   } else {
     mPath = tPath;
   }
-  mPath.prepend("[File Browser] ");
+  mPath.prepend("[Browser] ");
   mPath.append("/");
   tabWidget->setTabText(index, mPath);
 }