File indexing completed on 2024-04-28 11:20:53

 /*
     SPDX-License-Identifier: GPL-2.0-or-later
     SPDX-FileCopyrightText: 2009 Alexander Rieder <alexanderrieder@gmail.com>
     SPDX-FileCopyrightText: 2018-2023 Alexander Semke <alexander.semke@web.de>
 */
 #include "cantor.h"
 #include "lib/session.h"
 
 #include <cassert>
 
 #include <KActionCollection>
 #include <KConfigDialog>
 #include <KConfigGroup>
 #include <KConfig>
 #include <KMessageBox>
 #include <KShortcutsDialog>
 #include <KStandardAction>
 #include <KNSWidgets/Action>
 #include <KParts/ReadWritePart>
 #include <KRecentFilesAction>
 #include <KPluginFactory>
 
 #include <QApplication>
 #include <QCloseEvent>
 #include <QDebug>
 #include <QDir>
 #include <QDockWidget>
 #include <QFileDialog>
 #include <QStatusBar>
 #include <QGraphicsView>
 #include <QPushButton>
 #include <QRegularExpression>
 
 #include "lib/backend.h"
 #include "lib/worksheetaccess.h"
 
 #include "backendchoosedialog.h"
 #include "settings.h"
 #include "ui_settings.h"
 #include "ui_formating.h"
 #include "backendchoosedialog.h"
 #include <QMetaObject>
 
 CantorShell::CantorShell() : KParts::MainWindow(), m_tabWidget(new QTabWidget(this))
 {
     // set the shell's ui resource file
     setXMLFile(QLatin1String("cantor_shell.rc"));
 
     // then, setup our actions
     setupActions();
 
     createGUI(nullptr);
 
     m_tabWidget->setTabsClosable(true);
     m_tabWidget->setMovable(true);
     m_tabWidget->setDocumentMode(true);
     setCentralWidget(m_tabWidget);
 
     connect(m_tabWidget, &QTabWidget::currentChanged, this, &CantorShell::activateWorksheet);
     connect(m_tabWidget, &QTabWidget::tabCloseRequested, this, &CantorShell::closeTab);
 
     // apply the saved mainwindow settings, if any, and ask the mainwindow
     // to automatically save settings if changed: window size, toolbar
     // position, icon size, etc.
     setAutoSaveSettings();
 
     setDockOptions(QMainWindow::AnimatedDocks|QMainWindow::AllowTabbedDocks|QMainWindow::VerticalTabs);
 
     initPanels();
 
     updateNewSubmenu();
 }
 
 CantorShell::~CantorShell()
 {
     if (m_recentProjectsAction)
         m_recentProjectsAction->saveEntries(KSharedConfig::openConfig()->group(QLatin1String("Recent Files")));
 
     if (!m_newBackendActions.isEmpty())
     {
         unplugActionList(QLatin1String("new_worksheet_with_backend_list"));
         qDeleteAll(m_newBackendActions);
         m_newBackendActions.clear();
     }
 
     unplugActionList(QLatin1String("view_show_panel_list"));
     qDeleteAll(m_panels);
     m_panels.clear();
 }
 
 void CantorShell::load(const QUrl& url)
 {
     // If the url already opened, then don't open the url in another tab, but
     // just activate the already existed tab
     for (int i = 0; i < m_parts.size(); i++)
     {
         auto* part = m_parts[i];
         if (part && part->url() == url)
         {
             if (m_tabWidget->currentIndex() != i)
                 activateWorksheet(i);
             else
                 KMessageBox::information(this, i18n("The file %1 is already opened.", QFileInfo(url.toLocalFile()).fileName()), i18n("Open file"));
             return;
         }
     }
 
     if (!m_part || !m_part->url().isEmpty() || m_part->isModified())
     {
         addWorksheet(QString());
         m_tabWidget->setCurrentIndex(m_parts.size() - 1);
     }
 
     if (m_part->openUrl(url)) {
         if (m_recentProjectsAction)
             m_recentProjectsAction->addUrl(url);
 
         updateWindowTitle(m_part->url().fileName());
     } else
         closeTab(m_tabWidget->currentIndex());
 }
 
 void CantorShell::setupActions()
 {
     QAction* openNew = KStandardAction::openNew(this, SLOT(fileNew()), actionCollection());
     openNew->setPriority(QAction::LowPriority);
     QAction* open = KStandardAction::open(this, SLOT(fileOpen()), actionCollection());
     open->setPriority(QAction::LowPriority);
     m_recentProjectsAction = KStandardAction::openRecent(this, &CantorShell::load, actionCollection());
     m_recentProjectsAction->setPriority(QAction::LowPriority);
     m_recentProjectsAction->loadEntries(KSharedConfig::openConfig()->group(QLatin1String("Recent Files")));
 
     KStandardAction::close(this, SLOT(closeTab()),  actionCollection());
 
     KStandardAction::quit(qApp, SLOT(closeAllWindows()), actionCollection());
 
     createStandardStatusBarAction();
     //setStandardToolBarMenuEnabled(true);
 
     KStandardAction::keyBindings(this, SLOT(optionsConfigureKeys()), actionCollection());
     KStandardAction::configureToolbars(this, SLOT(configureToolbars()), actionCollection());
 
     KStandardAction::preferences(this, SLOT(showSettings()), actionCollection());
 
     KNSWidgets::Action* downloadExamples = new KNSWidgets::Action(i18n("Download Examples"), QStringLiteral("cantor.knsrc"), actionCollection());
     actionCollection()->addAction(QLatin1String("file_example_download"), downloadExamples);
 
     QAction* openExample = new QAction(i18n("&Open Example"), actionCollection());
     openExample->setIcon(QIcon::fromTheme(QLatin1String("document-open")));
     actionCollection()->addAction(QLatin1String("file_example_open"), openExample);
     connect(openExample, &QAction::triggered, this, &CantorShell::openExample);
 
     QAction* toPreviousTab = new QAction(i18n("Go to previous worksheet"), actionCollection());
     actionCollection()->addAction(QLatin1String("go_to_previous_tab"), toPreviousTab);
     actionCollection()->setDefaultShortcut(toPreviousTab, Qt::CTRL+Qt::Key_PageDown);
     connect(toPreviousTab, &QAction::triggered, toPreviousTab, [this](){
         const int index = m_tabWidget->currentIndex()-1;
         if (index >= 0)
             m_tabWidget->setCurrentIndex(index);
         else
             m_tabWidget->setCurrentIndex(m_tabWidget->count()-1);
     });
     addAction(toPreviousTab);
 
     QAction* toNextTab = new QAction(i18n("Go to next worksheet"), actionCollection());
     actionCollection()->addAction(QLatin1String("go_to_next_tab"), toNextTab);
     actionCollection()->setDefaultShortcut(toNextTab, Qt::CTRL+Qt::Key_PageUp);
     connect(toNextTab, &QAction::triggered, toNextTab, [this](){
         const int index = m_tabWidget->currentIndex()+1;
         if (index < m_tabWidget->count())
             m_tabWidget->setCurrentIndex(index);
         else
             m_tabWidget->setCurrentIndex(0);
     });
     addAction(toNextTab);
 }
 
 void CantorShell::saveProperties(KConfigGroup & /*config*/)
 {
     // the 'config' object points to the session managed
     // config file.  anything you write here will be available
     // later when this app is restored
 }
 
 void CantorShell::readProperties(const KConfigGroup & /*config*/)
 {
     // the 'config' object points to the session managed
     // config file.  this function is automatically called whenever
     // the app is being restored.  read in here whatever you wrote
     // in 'saveProperties'
 }
 
 /*!
  * called when one of the "new backend" action or the "New" action are called
  * adds a new worksheet with the backend assossiated with the called action
  * or opens the "Choose Backend" dialog, respectively.
  */
 void CantorShell::fileNew()
 {
     QAction* a = static_cast<QAction*>(sender());
     const QString& backendName = a->data().toString();
     if (!backendName.isEmpty())
     {
         addWorksheet(backendName);
         return;
     }
 
     //"New" action was called -> open the "Choose Backend" dialog.
     addWorksheet();
 }
 
 void CantorShell::optionsConfigureKeys()
 {
     KShortcutsDialog dlg( KShortcutsEditor::AllActions, KShortcutsEditor::LetterShortcutsDisallowed, this );
     dlg.addCollection( actionCollection(), i18n("Cantor") );
     if (m_part)
         dlg.addCollection( m_part->actionCollection(), i18n("Cantor") );
     dlg.configure( true );
 }
 
 void CantorShell::fileOpen()
 {
     // this slot is called whenever the File->Open menu is selected,
     // the Open shortcut is pressed (usually CTRL+O) or the Open toolbar
     // button is clicked
     static const QString& filter = i18n("All supported files (*.cws *ipynb);;Cantor Worksheet (*.cws);;Jupyter Notebook (*.ipynb)");
     const QUrl& url = QFileDialog::getOpenFileUrl(this, i18n("Open file"), QUrl(), filter, &m_previousFilter);
 
     if (url.isEmpty() == false)
     {
         // About this function, the style guide
         // says that it should open a new window if the document is _not_
         // in its initial state.  This is what we do here..
         /*if ( m_part->url().isEmpty() && ! m_part->isModified() )
         {
             // we open the file in this window...
             load( url );
         }
         else
         {
             // we open the file in a new window...
             CantorShell* newWin = new CantorShell;
             newWin->load( url );
             newWin->show();
             }*/
         load(url);
     }
 }
 
 void CantorShell::addWorksheet()
 {
     bool hasBackend = false;
     for (auto* b : Cantor::Backend::availableBackends())
     {
         if(b->isEnabled())
         {
             hasBackend = true;
             break;
         }
     }
 
     if(hasBackend) //There is no point in asking for the backend, if no one is available
     {
         QString backend = Settings::self()->defaultBackend();
         if (backend.isEmpty())
         {
             QPointer<BackendChooseDialog> dlg=new BackendChooseDialog(this);
             if(dlg->exec())
             {
                 backend = dlg->backendName();
                 addWorksheet(backend);
             }
 
             delete dlg;
         }
         else
         {
             addWorksheet(backend);
         }
 
     }else
     {
         QTextBrowser* browser = new QTextBrowser(this);
         QString backendList = QLatin1String("<ul>");
         int backendListSize = 0;
         for (auto* backend : Cantor::Backend::availableBackends())
         {
             if(!backend->requirementsFullfilled()) //It's disabled because of missing dependencies, not because of some other reason(like eg. nullbackend)
             {
                 backendList += QString::fromLatin1("<li>%1: <a href=\"%2\">%2</a></li>").arg(backend->name(), backend->url());
                 ++backendListSize;
             }
         }
         browser->setHtml(i18np("<h1>No Backend Found</h1>\n"             \
                                "<div>You could try:\n"                   \
                                "  <ul>"                                  \
                                "    <li>Changing the settings in the config dialog;</li>" \
                                "    <li>Installing packages for the following program:</li>" \
                                "     %2 "                                \
                                "  </ul> "                                 \
                                "</div> "
                               , "<h1>No Backend Found</h1>\n"             \
                                "<div>You could try:\n"                   \
                                "  <ul>"                                  \
                                "    <li>Changing the settings in the config dialog;</li>" \
                                "    <li>Installing packages for one of the following programs:</li>" \
                                "     %2 "                                \
                                "  </ul> "                                 \
                                "</div> "
                               , backendListSize, backendList
                               ));
 
         browser->setObjectName(QLatin1String("ErrorMessage"));
         m_tabWidget->addTab(browser, i18n("Error"));
     }
 }
 
 void CantorShell::addWorksheet(const QString& backendName)
 {
     static int sessionCount=1;
 
     // this routine will find and load our Part.  it finds the Part by
     // name which is a bad idea usually.. but it's alright in this
     // case since our Part is made for this Shell
 
     const auto partResult = KPluginFactory::instantiatePlugin<KParts::ReadWritePart>(KPluginMetaData(QStringLiteral("kf5/parts/cantorpart")), m_tabWidget, {backendName});
 
     if (partResult)
     {
         Cantor::Backend* backend = nullptr;
         if (!backendName.isEmpty())
         {
             backend = Cantor::Backend::getBackend(backendName);
             if (!backend)
             {
                 KMessageBox::error(this, i18n("Backend %1 is not installed", backendName), i18n("Cantor"));
                 return;
             }
             else
             {
                 if (!backend->isEnabled())
                 {
                     KMessageBox::error(this, i18n("%1 backend installed, but inactive. Please check installation and Cantor settings", backendName), i18n("Cantor"));
                     return;
                 }
             }
         }
 
         // now that the Part is loaded, we cast it to a Part to get our hands on it
         auto part = partResult.plugin;
 
         connect(part, SIGNAL(setCaption(QString,QIcon)), this, SLOT(setTabCaption(QString,QIcon)));
         connect(part, SIGNAL(worksheetSave(QUrl)), this, SLOT(onWorksheetSave(QUrl)));
         connect(part, SIGNAL(showHelp(QString)), this, SIGNAL(showHelp(QString)));
         connect(part, SIGNAL(hierarchyChanged(QStringList, QStringList, QList<int>)), this, SIGNAL(hierarchyChanged(QStringList, QStringList, QList<int>)));
         connect(part, SIGNAL(hierarhyEntryNameChange(QString, QString, int)), this, SIGNAL(hierarhyEntryNameChange(QString, QString, int)));
         connect(this, SIGNAL(requestScrollToHierarchyEntry(QString)), part, SIGNAL(requestScrollToHierarchyEntry(QString)));
         connect(this, SIGNAL(settingsChanges()), part, SIGNAL(settingsChanges()));
         connect(part, SIGNAL(requestDocumentation(QString)), this, SIGNAL(requestDocumentation(QString)));
 
         m_parts.append(part);
         if (backend)
             m_parts2Backends[part] = backend->id();
         else
         {
             // if the backend is empty (loading worksheet from file), connect to the signal and wait
             m_parts2Backends[part] = QString();
             connect(part, SIGNAL(setBackendName(QString)), this, SLOT(updateBackendForPart(QString)));
         }
 
         int tab = m_tabWidget->addTab(part->widget(), i18n("Session %1", sessionCount++));
         m_tabWidget->setCurrentIndex(tab);
         // Setting focus on worksheet view, because Qt clear focus of added widget inside addTab
         // This fix https://bugs.kde.org/show_bug.cgi?id=395976
         part->widget()->findChild<QGraphicsView*>()->setFocus();
 
         // Force run updateCaption for getting proper backend icon
         QMetaObject::invokeMethod(part, "updateCaption");
 
         //all panels initialized, show the default help string in the help panel
         if (backend)
             emit showHelp(backend->defaultHelp());
     }
     else
     {
         // if we couldn't find our Part, we exit since the Shell by
         // itself can't do anything useful
         KMessageBox::error(this, i18n("Failed to find the Cantor Part with error %1", partResult.errorString));
         qApp->quit();
         // we return here, cause qApp->quit() only means "exit the
         // next time we enter the event loop...
         return;
     }
 
 }
 
 void CantorShell::activateWorksheet(int index)
 {
     // Save part panels states before change worksheet
     if (m_part)
     {
         QStringList visiblePanelNames;
         for (auto* doc : m_panels)
         {
             if (doc->widget() && doc->widget()->isVisible())
                 visiblePanelNames << doc->objectName();
         }
         m_pluginsVisibility[m_part] = visiblePanelNames;
 
         auto* wa = m_part->findChild<Cantor::WorksheetAccessInterface*>(Cantor::WorksheetAccessInterface::Name);
         assert(wa);
         Cantor::PanelPluginHandler::PanelStates states;
         auto plugins = m_panelHandler.plugins(wa->session());
         for(auto* plugin : plugins)
         {
             states.insert(plugin->name(), plugin->saveState());
         }
         m_pluginsStates[m_part] = states;
     }
 
     if (index != -1)
     {
         m_part = findPart(m_tabWidget->widget(index));
         if(m_part)
         {
             createGUI(m_part);
 
             //update the status bar
             auto* wa = m_part->findChild<Cantor::WorksheetAccessInterface*>(Cantor::WorksheetAccessInterface::Name);
             if (wa->session())
             {
                 auto status = wa->session()->status();
                 switch (status) {
                     case Cantor::Session::Running:
                         statusBar()->showMessage(i18n("Calculating..."));
                         break;
                     case Cantor::Session::Done:
                         statusBar()->showMessage(i18n("Ready"));
                         break;
                     case Cantor::Session::Disable:
                         statusBar()->showMessage(QString());
                         break;
                 }
             }
 
             updateWindowTitle(m_part->url().fileName(), m_part->isModified());
 
             updatePanel();
         }
         else
             qDebug()<<"selected part doesn't exist";
 
         m_tabWidget->setCurrentIndex(index);
     }
 }
 
 void CantorShell::setTabCaption(const QString& caption, const QIcon& icon)
 {
     auto* part = dynamic_cast<KParts::ReadWritePart*>(sender());
     if (part)
     {
         const int index = m_tabWidget->indexOf(part->widget());
         if (!caption.isEmpty())
         {
             if (part->isModified())
                 m_tabWidget->setTabText(index, caption + QLatin1String(" *"));
             else
                 m_tabWidget->setTabText(index, caption);
 
             if (part == m_part)
                 updateWindowTitle(m_part->url().fileName(), m_part->isModified());
         }
         m_tabWidget->setTabIcon(index, icon);
     }
 }
 
 void CantorShell::updateWindowTitle(const QString& fileName, bool modified)
 {
     QFileInfo info(fileName);
     QString title = info.baseName();
     if (modified)
         title += QLatin1String("    [") + i18n("Changed") + QLatin1Char(']');
 
     setWindowTitle(title);
 }
 
 void CantorShell::closeTab(int index)
 {
     if (index != -1)
     {
         QWidget* widget = m_tabWidget->widget(index);
         if (widget)
         {
             auto* part = findPart(widget);
             if (part && !reallyCloseThisPart(part))
                 return;
         }
     }
     else
     {
         if (!reallyClose(false))
             return;
     }
 
     QWidget* widget = nullptr;
     if (index >= 0)
     {
         widget = m_tabWidget->widget(index);
     }
     else if (m_part)
     {
         widget = m_part->widget();
     }
 
     if (!widget)
     {
         qWarning() << "Could not find widget by tab index" << index;
         return;
     }
 
 
     m_tabWidget->removeTab(index);
 
     bool isCurrectPartClosed = m_part ? widget == m_part->widget() : false;
     if(widget->objectName() == QLatin1String("ErrorMessage"))
     {
         widget->deleteLater();
     }else
     {
         auto* part = findPart(widget);
         if(part)
         {
             saveDockPanelsState(part);
 
             m_parts.removeAll(part);
             m_pluginsVisibility.remove(part);
             m_parts2Backends.remove(part);
             m_pluginsStates.remove(part);
 
             if (m_part == part)
                 m_part = nullptr; //the current worksheet/part is being closed, set to null
 
             delete part;
         }
     }
 
     if (m_tabWidget->count() == 0)
         setCaption(QString());
 
     if (isCurrectPartClosed || m_part == nullptr)
         updatePanel();
 }
 
 bool CantorShell::reallyClose(bool checkAllParts) {
     if(checkAllParts && m_parts.count() > 1) {
         bool modified = false;
         for (auto* part : m_parts)
         {
             if(part->isModified()) {
                 modified = true;
                 break;
             }
         }
         if(!modified) return true;
         int want_save = KMessageBox::warningYesNo( this,
             i18n("Multiple unsaved Worksheets are opened. Do you want to close them?"),
             i18n("Close Cantor"));
         switch (want_save) {
             case KMessageBox::Yes:
                 return true;
             case KMessageBox::No:
                 return false;
         }
     }
 
     return reallyCloseThisPart(m_part);
 }
 
 bool CantorShell::reallyCloseThisPart(KParts::ReadWritePart* part)
 {
      if (part && part->isModified() ) {
         int want_save = KMessageBox::warningYesNoCancel( this,
             i18n("The current project has been modified. Do you want to save it?"),
             i18n("Save Project"));
         switch (want_save) {
             case KMessageBox::Yes:
                 part->save();
                 if(part->waitSaveComplete()) {
                     return true;
                 } else {
                     part->setModified(true);
                     return false;
                 }
             case KMessageBox::Cancel:
                 return false;
             case KMessageBox::No:
                 return true;
         }
     }
     return true;
 }
 
 
 void CantorShell::closeEvent(QCloseEvent* event) {
     if (!reallyClose()) {
         event->ignore();
     } else {
         for (auto* part : m_parts)
             saveDockPanelsState(part);
 
         KParts::MainWindow::closeEvent(event);
     }
 }
 
 void CantorShell::showSettings()
 {
     KConfigDialog *dialog = new KConfigDialog(this,  QLatin1String("settings"), Settings::self());
 
     QWidget *generalSettings = new QWidget;
     Ui::SettingsBase base;
     base.setupUi(generalSettings);
 
     QWidget *formattingSettings = new QWidget;
     Ui::SettingsFormatting formatting;
     formatting.setupUi(formattingSettings);
 
     base.kcfg_DefaultBackend->addItems(Cantor::Backend::listAvailableBackends());
 
     dialog->addPage(generalSettings, i18n("General"), QLatin1String("preferences-other"));
     dialog->addPage(formattingSettings, i18n("Formatting"), QLatin1String("preferences-other"));
     for (auto* backend : Cantor::Backend::availableBackends())
     {
         if (backend->config()) //It has something to configure, so add it to the dialog
             dialog->addPage(backend->settingsWidget(dialog), backend->config(), backend->name(),  backend->icon());
     }
 
     dialog->show();
     connect(dialog, &KConfigDialog::settingsChanged, this, &CantorShell::settingsChanges);
 }
 
 void CantorShell::openExample()
 {
     QString dir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation) + QLatin1String("/examples");
     if (dir.isEmpty())
         return;
 
     QDir().mkpath(dir);
 
     QStringList files = QDir(dir).entryList(QDir::Files);
     QPointer<QDialog> dlg = new QDialog(this);
     QListWidget* list = new QListWidget(dlg);
     for (const QString& file : files)
     {
         QString name = file;
         name.remove(QRegularExpression(QStringLiteral("-.*\\.hotstuff-access$")));
         list->addItem(name);
     }
 
     QVBoxLayout *mainLayout = new QVBoxLayout;
     dlg->setLayout(mainLayout);
     mainLayout->addWidget(list);
 
     auto* buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
 
     mainLayout->addWidget(buttonBox);
 
     buttonBox->button(QDialogButtonBox::Ok)->setIcon(QApplication::style()->standardIcon(QStyle::SP_DialogOkButton));
     buttonBox->button(QDialogButtonBox::Cancel)->setIcon(QApplication::style()->standardIcon(QStyle::SP_DialogCancelButton));
 
     connect(buttonBox, &QDialogButtonBox::accepted, dlg, &QDialog::accept);
     connect(buttonBox, &QDialogButtonBox::rejected, dlg, &QDialog::reject);
 
     if (dlg->exec() == QDialog::Accepted&&list->currentRow()>=0)
     {
         const QString& selectedFile = files[list->currentRow()];
         const QUrl& url = QUrl::fromLocalFile(QDir(dir).absoluteFilePath(selectedFile));
 
         qDebug()<<"loading file "<<url;
         load(url);
     }
 
     delete dlg;
 }
 
 KParts::ReadWritePart* CantorShell::findPart(QWidget* widget)
 {
     for (auto* part : m_parts)
     {
         if (part->widget() == widget)
             return part;
     }
     return nullptr;
 }
 
 void CantorShell::initPanels()
 {
     m_panelHandler.loadPlugins();
 
     for (auto* plugin : m_panelHandler.allPlugins())
     {
         if (!plugin)
         {
             qDebug()<<"invalid panel found, skipping it.";
             continue;
         }
 
         qDebug()<<"adding panel for "<<plugin->name();
         plugin->setParentWidget(this);
         plugin->connectToShell(this);
 
         QDockWidget* docker = new QDockWidget(plugin->name(), this);
         docker->setObjectName(plugin->name());
         docker->setWidget(plugin->widget());
         docker->setWindowIcon(QIcon::fromTheme(QStringLiteral("format-text-bold")));
         addDockWidget(Qt::RightDockWidgetArea, docker);
 
         docker->hide();
 
         connect(plugin, &Cantor::PanelPlugin::visibilityRequested, this, &CantorShell::pluginVisibilityRequested);
         connect(plugin, &Cantor::PanelPlugin::requestRunCommand, this, &CantorShell::pluginCommandRunRequested);
 
         m_panels.append(docker);
     }
 }
 
 void CantorShell::updatePanel()
 {
     unplugActionList(QLatin1String("view_show_panel_list"));
 
     QList<QAction*> panelActions;
 
     bool isNewWorksheet = !m_pluginsVisibility.contains(m_part);
     if (isNewWorksheet)
     {
         KConfigGroup panelStatusGroup(KSharedConfig::openConfig(), QLatin1String("PanelsStatus"));
         if (m_parts2Backends.contains(m_part) && panelStatusGroup.hasKey(m_parts2Backends[m_part]))
         {
             const QStringList& plugins = panelStatusGroup.readEntry(m_parts2Backends[m_part]).split(QLatin1Char('\n'));
             m_pluginsVisibility[m_part] = plugins;
             isNewWorksheet = false;
         }
     }
 
     Cantor::WorksheetAccessInterface* wa = nullptr;
     if (m_part)
         wa = m_part->findChild<Cantor::WorksheetAccessInterface*>(Cantor::WorksheetAccessInterface::Name);
 
     // Worksheet interface can be missing on m_part clossing (and m_part on this moment can be nullptr)
     QList<Cantor::PanelPlugin*> plugins;
     if (wa)
     {
         QDockWidget* last = nullptr;
         plugins = m_panelHandler.activePluginsForSession(wa->session(), m_pluginsStates.contains(m_part) ? m_pluginsStates[m_part] : Cantor::PanelPluginHandler::PanelStates());
         for (auto* plugin : plugins)
         {
             QDockWidget* foundDocker = nullptr;
             for (auto* docker : m_panels)
                 if (docker->objectName() == plugin->name())
                 {
                     foundDocker = docker;
                     break;
                 }
 
             if (!foundDocker)
             {
                 qDebug() << "something wrong: can't find panel for plugin \"" << plugin->name() << "\"";
                 continue;
             }
 
             // Set visibility for dock from saved info
             if (isNewWorksheet)
             {
                 if (plugin->showOnStartup())
                     foundDocker->show();
                 else
                     foundDocker->hide();
             }
             else
             {
                 if (m_pluginsVisibility[m_part].contains(plugin->name()))
                     foundDocker->show();
                 else
                     foundDocker->hide();
             }
 
             if(last!=nullptr)
                 tabifyDockWidget(last, foundDocker);
             last = foundDocker;
 
             //Create the action to show/hide this panel
             panelActions<<foundDocker->toggleViewAction();
 
         }
     }
 
     // Hide plugins, which don't supported on current session
     QList<Cantor::PanelPlugin*> allPlugins=m_panelHandler.allPlugins();
     for(auto* plugin : allPlugins)
     {
         if (plugins.indexOf(plugin) == -1)
             for (QDockWidget* docker : m_panels)
                 if (docker->objectName() == plugin->name())
                 {
                     docker->hide();
                     break;
                 }
     }
 
     plugActionList(QLatin1String("view_show_panel_list"), panelActions);
 
     updateNewSubmenu();
 }
 
 void CantorShell::updateNewSubmenu()
 {
     unplugActionList(QLatin1String("new_worksheet_with_backend_list"));
     qDeleteAll(m_newBackendActions);
     m_newBackendActions.clear();
 
     for (auto* backend : Cantor::Backend::availableBackends())
     {
         if (!backend->isEnabled())
             continue;
         QAction* action = new QAction(QIcon::fromTheme(backend->icon()), backend->name(), nullptr);
         action->setData(backend->name());
         connect(action, SIGNAL(triggered()), this, SLOT(fileNew()));
         m_newBackendActions << action;
     }
     plugActionList(QLatin1String("new_worksheet_with_backend_list"), m_newBackendActions);
 }
 
 Cantor::WorksheetAccessInterface* CantorShell::currentWorksheetAccessInterface()
 {
     auto* wa = m_part->findChild<Cantor::WorksheetAccessInterface*>(Cantor::WorksheetAccessInterface::Name);
     return wa;
 }
 
 void CantorShell::pluginVisibilityRequested()
 {
     auto* plugin = static_cast<Cantor::PanelPlugin*>(sender());
     for (auto* docker : m_panels)
     {
         if (plugin->name() == docker->objectName())
         {
             if (docker->isHidden())
                 docker->show();
             docker->raise();
         }
     }
 }
 
 void CantorShell::onWorksheetSave(const QUrl& url)
 {
     if (m_recentProjectsAction)
         m_recentProjectsAction->addUrl(url);
 
     updateWindowTitle(m_part->url().fileName());
 }
 
 void CantorShell::saveDockPanelsState(KParts::ReadWritePart* part)
 {
     if (m_parts2Backends.contains(part))
     {
         QStringList visiblePanelNames;
         if (part == m_part)
         {
             for (auto* doc : m_panels)
             {
                 if (doc->widget() && doc->widget()->isVisible())
                     visiblePanelNames << doc->objectName();
             }
         }
         else if (m_pluginsVisibility.contains(part))
             visiblePanelNames = m_pluginsVisibility[part];
 
         KConfigGroup panelStatusGroup(KSharedConfig::openConfig(), QLatin1String("PanelsStatus"));
         panelStatusGroup.writeEntry(m_parts2Backends[part], visiblePanelNames.join(QLatin1Char('\n')));
     }
 }
 
 void CantorShell::updateBackendForPart(const QString& backendName)
 {
     auto* part = dynamic_cast<KParts::ReadWritePart*>(sender());
     if (part && m_parts2Backends.contains(part) && m_parts2Backends[part].isEmpty())
     {
         m_parts2Backends[part] = backendName;
 
         KConfigGroup panelStatusGroup(KSharedConfig::openConfig(), QLatin1String("PanelsStatus"));
         if (m_part == part && panelStatusGroup.hasKey(backendName))
         {
             const QStringList& plugins = panelStatusGroup.readEntry(m_parts2Backends[m_part]).split(QLatin1Char('\n'));
             m_pluginsVisibility[m_part] = plugins;
 
             updatePanel();
         }
 
         auto* backend = Cantor::Backend::getBackend(backendName);
         if (backend)
         {
             //show the default help string in the help panel
             emit showHelp(backend->defaultHelp());
         }
     }
 }
 
 void CantorShell::pluginCommandRunRequested(const QString& cmd)
 {
     if (m_part)
         QMetaObject::invokeMethod(m_part, "runCommand", Qt::QueuedConnection, Q_ARG(QString, cmd));
 }