]> git.lyx.org Git - features.git/blobdiff - src/frontends/qt/GuiApplication.cpp
Qt6 pixmaps are always HiDPI - avoid deprecate warning for setAttribute
[features.git] / src / frontends / qt / GuiApplication.cpp
index 2c87ad10a2aecb6210b105bb8e1c7df58de1b3c0..ed201301a7de9784091ab41560d8e4ead8e4923a 100644 (file)
 
 #include "insets/InsetText.h"
 
+#include "support/checksum.h"
 #include "support/convert.h"
 #include "support/debug.h"
 #include "support/ExceptionMessage.h"
+#include "support/environment.h"
 #include "support/FileName.h"
 #include "support/filetools.h"
 #include "support/ForkedCalls.h"
 #include <tuple>
 
 #include <QByteArray>
+#include <QBitmap>
 #include <QDateTime>
+#if QT_VERSION < 0x060000
 #include <QDesktopWidget>
-#include <QDir>
+#endif
 #include <QEvent>
 #include <QFileOpenEvent>
 #include <QFileInfo>
 #include <QMenuBar>
 #include <QMimeData>
 #include <QObject>
+#include <QPainter>
 #include <QPixmap>
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+#include <QRandomGenerator>
+#endif
 #include <QRegExp>
 #include <QSessionManager>
 #include <QSettings>
 #if (QT_VERSION < 0x050000)
 #include <QWindowsMime>
 #define QWINDOWSMIME QWindowsMime
+#define QVARIANTTYPE QVariant::Type
+#elif (QT_VERSION >= 0x060000)
+#include <QtGui/private/qguiapplication_p.h>
+#include <QtGui/private/qwindowsmime_p.h>
+#include <QtGui/qpa/qplatformintegration.h>
+#define QWINDOWSMIME QWindowsMime
+#define QVARIANTTYPE QMetaType
+using QWindowsMime = QNativeInterface::Private::QWindowsMime;
+using QWindowsApplication = QNativeInterface::Private::QWindowsApplication;
 #else
 #include <QWinMime>
 #define QWINDOWSMIME QWinMime
+#define QVARIANTTYPE QVariant::Type
 #endif
 #ifdef Q_CC_GNU
 #include <wtypes.h>
 #endif
 #endif
 
-#ifdef Q_OS_MAC
+#if defined(Q_OS_MAC) && (QT_VERSION < 0x060000)
 #include <QMacPasteboardMime>
 #endif // Q_OS_MAC
 
-#include <boost/crc.hpp>
-
 #include <exception>
 #include <sstream>
 #include <vector>
@@ -180,6 +196,24 @@ frontend::Application * createApplication(int & argc, char * argv[])
        AllowSetForegroundWindow(ASFW_ANY);
 #endif
 
+
+// Setup high DPI handling. This is a bit complicated, but will be default in Qt6.
+// macOS does it by itself.
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) && !defined(Q_OS_MAC)
+#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+    // Attribute Qt::AA_EnableHighDpiScaling must be set before QCoreApplication is created
+    if (getEnv("QT_ENABLE_HIGHDPI_SCALING").empty()
+               && getEnv("QT_AUTO_SCREEN_SCALE_FACTOR").empty())
+        QApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
+#endif
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+    // HighDPI scale factor policy must be set before QGuiApplication is created
+    if (getEnv("QT_SCALE_FACTOR_ROUNDING_POLICY").empty())
+        QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
+#endif
+#endif
+
        frontend::GuiApplication * guiApp = new frontend::GuiApplication(argc, argv);
        // I'd rather do that in the constructor, but I do not think that
        // the palette is accessible there.
@@ -477,9 +511,10 @@ QString themeIconName(QString const & action)
 }
 
 
-// the returned bool is true if the icon needs to be flipped
-pair<QString,bool> iconName(FuncRequest const & f, bool unknown, bool rtl)
+IconInfo iconInfo(FuncRequest const & f, bool unknown, bool rtl)
 {
+       IconInfo res;
+
        QStringList names;
        QString lfunname = toqstr(lyxaction.getActionName(f.action()));
 
@@ -489,6 +524,8 @@ pair<QString,bool> iconName(FuncRequest const & f, bool unknown, bool rtl)
                name.replace(' ', '_');
                name.replace(';', '_');
                name.replace('\\', "backslash");
+               // avoid duplication for these
+               name.replace("dialog-toggle", "dialog-show");
                names << name;
 
                // then special default icon for some lfuns
@@ -526,11 +563,11 @@ pair<QString,bool> iconName(FuncRequest const & f, bool unknown, bool rtl)
        if (unknown)
                names << "unknown";
 
-       search_mode const mode = theGuiApp()->imageSearchMode();
+       search_mode const mode = theGuiApp() ? theGuiApp()->imageSearchMode() : support::must_exist;
        // The folders where icons are searched for
        QStringList imagedirs;
-       imagedirs << "images/" << "images/ipa/";
-       // This is used to search for rtl version of icons which have the +rrtl suffix.
+       imagedirs << "images/ipa/" << "images/";
+       // This is used to search for rtl version of icons which have the +rtl suffix.
        QStringList suffixes;
        if (rtl)
                suffixes << "+rtl";
@@ -541,16 +578,60 @@ pair<QString,bool> iconName(FuncRequest const & f, bool unknown, bool rtl)
                        for (QString const & suffix : suffixes) {
                                QString id = imagedir;
                                FileName fname = imageLibFileSearch(id, name + suffix, "svgz,png", mode);
-                               if (fname.exists())
-                                       return make_pair(toqstr(fname.absFileName()),
-                                                        rtl && suffix.isEmpty());
+                               if (fname.exists()) {
+                                       docstring const fpath = fname.absoluteFilePath();
+                                       res.filepath = toqstr(fname.absFileName());
+                                       // these icons are subject to inversion in dark mode
+                                       res.invert = (contains(fpath, from_ascii("math")) || contains(fpath, from_ascii("ert-insert"))
+                                                     || suffixIs(fname.onlyPath().absoluteFilePath(), from_ascii("ipa")));
+                                       res.swap = rtl && suffix.isEmpty();
+                                       return res;
+                               }
                        }
 
        LYXERR(Debug::GUI, "Cannot find icon for command \""
                           << lyxaction.getActionName(f.action())
                           << '(' << to_utf8(f.argument()) << ")\"");
 
-       return make_pair(QString(), false);
+       return res;
+}
+
+
+QPixmap prepareForDarkMode(QPixmap pixmap)
+{
+       QPalette palette = QPalette();
+       QColor text_color = palette.color(QPalette::Active, QPalette::WindowText);
+       QColor bg_color = palette.color(QPalette::Active, QPalette::Window);
+
+       // guess whether we are in dark mode
+       if (text_color.black() > bg_color.black())
+               // not in dark mode, do nothing
+               return pixmap;
+
+       // create a layer with black text turned to QPalette::WindowText
+       QPixmap black_overlay(pixmap.size());
+       black_overlay.fill(text_color);
+       black_overlay.setMask(pixmap.createMaskFromColor(Qt::black, Qt::MaskOutColor));
+
+       // create a layer with blue text turned to lighter blue
+       QPixmap blue_overlay(pixmap.size());
+       QColor math_blue(0, 0, 255);
+       blue_overlay.fill(guiApp->colorCache().get(Color(Color_math)));
+       blue_overlay.setMask(pixmap.createMaskFromColor(math_blue, Qt::MaskOutColor));
+
+       // create a layer with ("latex") red text turned to lighter red
+       QPixmap red_overlay(pixmap.size());
+       QColor math_red(128, 0, 0);
+       red_overlay.fill(guiApp->colorCache().get(Color(Color_latex)));
+       red_overlay.setMask(pixmap.createMaskFromColor(math_red, Qt::MaskOutColor));
+
+       // put layers on top of existing pixmap
+       QPainter painter(&pixmap);
+       painter.drawPixmap(pixmap.rect(), black_overlay);
+       painter.drawPixmap(pixmap.rect(), blue_overlay);
+       painter.drawPixmap(pixmap.rect(), red_overlay);
+
+       return pixmap;
 }
 
 
@@ -561,8 +642,12 @@ QPixmap getPixmap(QString const & path, QString const & name, QString const & ex
        QString fpath = toqstr(fname.absFileName());
        QPixmap pixmap = QPixmap();
 
-       if (pixmap.load(fpath))
+       if (pixmap.load(fpath)) {
+               if (fpath.contains("math") || fpath.contains("ipa")
+                   || fpath.contains("bullets"))
+                       return prepareForDarkMode(pixmap);
                return pixmap;
+       }
 
        bool const list = ext.contains(",");
        LYXERR(Debug::GUI, "Cannot load pixmap \""
@@ -590,20 +675,21 @@ QIcon getIcon(FuncRequest const & f, bool unknown, bool rtl)
        }
 #endif
 
-       QString icon;
-       bool flip;
-       tie(icon, flip) = iconName(f, unknown, rtl);
-       if (icon.isEmpty())
+       IconInfo icondata = iconInfo(f, unknown, rtl);
+       if (icondata.filepath.isEmpty())
                return QIcon();
 
        //LYXERR(Debug::GUI, "Found icon: " << icon);
        QPixmap pixmap = QPixmap();
-       if (!pixmap.load(icon)) {
-               LYXERR0("Cannot load icon " << icon << ".");
+       if (!pixmap.load(icondata.filepath)) {
+               LYXERR0("Cannot load icon " << icondata.filepath << ".");
                return QIcon();
        }
 
-       if (flip)
+       if (icondata.invert)
+               pixmap = prepareForDarkMode(pixmap);
+
+       if (icondata.swap)
                return QIcon(pixmap.transformed(QTransform().scale(-1, 1)));
        else
                return QIcon(pixmap);
@@ -640,7 +726,7 @@ public:
        QString translate(const char * /* context */,
                const char *sourceText,
 #if QT_VERSION >= 0x050000
-               const char * /* disambiguation */ = 0, int /* n */ = -1) const override
+               const char * /* disambiguation */ = nullptr, int /* n */ = -1) const override
 #else
                const char * /*comment*/ = 0) const override
 #endif
@@ -674,7 +760,7 @@ public:
 //
 ////////////////////////////////////////////////////////////////////////
 
-#ifdef Q_OS_MAC
+#if defined(Q_OS_MAC) && (QT_VERSION < 0x060000)
 // QMacPasteboardMimeGraphics can only be compiled on Mac.
 
 class QMacPasteboardMimeGraphics : public QMacPasteboardMime
@@ -781,7 +867,7 @@ public:
        }
 
        QVariant convertToMime(QString const & mimetype, IDataObject * pDataObj,
-               QVariant::Type /*preferredType*/) const override
+               QVARIANTTYPE /*preferredType*/) const override
        {
                QByteArray data;
                if (!canConvertToMime(mimetype, pDataObj))
@@ -896,16 +982,33 @@ struct GuiApplication::Private
 {
        Private(): language_model_(nullptr), meta_fake_bit(NoModifier),
                global_menubar_(nullptr)
+       #if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
+               , last_state_(Qt::ApplicationInactive)
+       #endif
        {
        #if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
        #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
                /// WMF Mime handler for Windows clipboard.
                wmf_mime_ = new QWindowsMimeMetafile;
+       #if (QT_VERSION >= 0x060000)
+               win_app_ = dynamic_cast<QWindowsApplication *>
+                       (QGuiApplicationPrivate::platformIntegration());
+               win_app_->registerMime(wmf_mime_);
+       #endif
        #endif
        #endif
                initKeySequences(&theTopLevelKeymap());
        }
 
+       #if (QT_VERSION >= 0x060000)
+       #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
+       ~Private()
+       {
+               win_app_->unregisterMime(wmf_mime_);
+       }
+       #endif
+       #endif
+
        void initKeySequences(KeyMap * kb)
        {
                keyseq = KeySequence(kb, kb);
@@ -962,8 +1065,12 @@ struct GuiApplication::Private
 
        /// Only used on mac.
        QMenuBar * global_menubar_;
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
+       /// Holds previous application state on Mac
+       Qt::ApplicationState last_state_;
+#endif
 
-#ifdef Q_OS_MAC
+#if defined(Q_OS_MAC) && (QT_VERSION < 0x060000)
        /// Linkback mime handler for MacOSX.
        QMacPasteboardMimeGraphics mac_pasteboard_mime_;
 #endif
@@ -972,6 +1079,9 @@ struct GuiApplication::Private
 #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
        /// WMF Mime handler for Windows clipboard.
        QWindowsMimeMetafile * wmf_mime_;
+#if (QT_VERSION >= 0x060000)
+       QWindowsApplication * win_app_;
+#endif
 #endif
 #endif
 
@@ -999,7 +1109,7 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        QCoreApplication::setOrganizationName(app_name);
        QCoreApplication::setOrganizationDomain("lyx.org");
        QCoreApplication::setApplicationName(lyx_package);
-#if QT_VERSION >= 0x050000
+#if QT_VERSION >= 0x050000 && QT_VERSION < 0x060000
        QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 #endif
 
@@ -1007,7 +1117,11 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        setDesktopFileName(lyx_package);
 #endif
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+       QRandomGenerator(QDateTime::currentDateTime().toSecsSinceEpoch());
+#else
        qsrand(QDateTime::currentDateTime().toTime_t());
+#endif
 
        // Install LyX translator for missing Qt translations
        installTranslator(&d->gui_trans_);
@@ -1034,6 +1148,10 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        setupApplescript();
        appleCleanupEditMenu();
        appleCleanupViewMenu();
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
+       connect(this, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
+                       this, SLOT(onApplicationStateChanged(Qt::ApplicationState)));
+#endif
 #endif
 
 #if defined(Q_WS_X11) || defined(QPA_XCB)
@@ -1089,6 +1207,29 @@ GuiApplication * theGuiApp()
 }
 
 
+#if QT_VERSION < 0x050000
+// Emulate platformName() for Qt4
+
+// FIXME: when ditching this method, remove all tests
+//     platformName() == "qt4x11"
+// in the code
+QString GuiApplication::platformName() const
+{
+# if defined(Q_WS_X11)
+       // Note that this one does not really exist
+       return "qt4x11";
+# elif defined(Q_OS_MAC)
+       return "cocoa";
+# elif defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
+       return "windows";
+# else
+       LYXERR0("Unknown platform!");
+       return "unknown";
+# endif
+}
+#endif
+
+
 double GuiApplication::pixelRatio() const
 {
 #if QT_VERSION >= 0x050000
@@ -1108,7 +1249,7 @@ void GuiApplication::clearSession()
 
 docstring Application::iconName(FuncRequest const & f, bool unknown)
 {
-       return qstring_to_ucs4(lyx::frontend::iconName(f, unknown, false).first);
+       return qstring_to_ucs4(lyx::frontend::iconInfo(f, unknown, false).filepath);
 }
 
 
@@ -1283,10 +1424,17 @@ bool GuiApplication::getStatus(FuncRequest const & cmd, FuncStatus & flag) const
        case LFUN_REPEAT:
        case LFUN_PREFERENCES_SAVE:
        case LFUN_BUFFER_SAVE_AS_DEFAULT:
-       case LFUN_DEBUG_LEVEL_SET:
                // these are handled in our dispatch()
                break;
 
+       case LFUN_DEBUG_LEVEL_SET: {
+               string bad = Debug::badValue(to_utf8(cmd.argument()));
+               enable = bad.empty();
+               if (!bad.empty())
+                       flag.message(bformat(_("Bad debug value `%1$s'."), from_utf8(bad)));
+               break;
+       }
+
        case LFUN_WINDOW_CLOSE:
                enable = !d->views_.empty();
                break;
@@ -1294,6 +1442,7 @@ bool GuiApplication::getStatus(FuncRequest const & cmd, FuncStatus & flag) const
        case LFUN_BUFFER_NEW:
        case LFUN_BUFFER_NEW_TEMPLATE:
        case LFUN_FILE_OPEN:
+       case LFUN_LYXFILES_OPEN:
        case LFUN_HELP_OPEN:
        case LFUN_SCREEN_FONT_UPDATE:
        case LFUN_SET_COLOR:
@@ -1391,7 +1540,7 @@ DispatchResult const & GuiApplication::dispatch(FuncRequest const & cmd)
 {
        DispatchResult dr;
 
-       Buffer * buffer = 0;
+       Buffer * buffer = nullptr;
        if (cmd.view_origin() && current_view_ != cmd.view_origin()) {
                //setCurrentView(cmd.view_origin); //does not work
                dr.setError(true);
@@ -1406,13 +1555,16 @@ DispatchResult const & GuiApplication::dispatch(FuncRequest const & cmd)
 
        dr.screenUpdate(Update::FitCursor);
        {
-               // This handles undo groups automagically
+               // All the code is kept inside the undo group because
+               // updateBuffer can create undo actions (see #11292)
                UndoGroupHelper ugh(buffer);
                dispatch(cmd, dr);
-               // redraw the screen at the end (first of the two drawing steps).
-               // This is done unless explicitly requested otherwise.
-               // This code is kept inside the undo group because updateBuffer
-               // can create undo actions (see #11292)
+               if (dr.screenUpdate() & Update::ForceAll) {
+                       for (Buffer const * b : theBufferList())
+                               b->changed(true);
+                       dr.screenUpdate(dr.screenUpdate() & ~Update::ForceAll);
+               }
+
                updateCurrentView(cmd, dr);
        }
 
@@ -1428,7 +1580,7 @@ void GuiApplication::updateCurrentView(FuncRequest const & cmd, DispatchResult &
 
        BufferView * bv = current_view_->currentBufferView();
        if (bv) {
-               if (dr.needBufferUpdate()) {
+               if (dr.needBufferUpdate() || bv->buffer().needUpdate()) {
                        bv->cursor().clearBufferUpdate();
                        bv->buffer().updateBuffer();
                }
@@ -1481,8 +1633,8 @@ void GuiApplication::gotoBookmark(unsigned int idx, bool openFile,
 
        // if the current buffer is not that one, switch to it.
        BufferView * doc_bv = current_view_ ?
-               current_view_->documentBufferView() : 0;
-       Cursor const * old = doc_bv ? &doc_bv->cursor() : 0;
+               current_view_->documentBufferView() : nullptr;
+       Cursor const * old = doc_bv ? &doc_bv->cursor() : nullptr;
        if (!doc_bv || doc_bv->buffer().fileName() != tmp.filename) {
                if (switchToBuffer) {
                        dispatch(FuncRequest(LFUN_BUFFER_SWITCH, file));
@@ -1525,8 +1677,10 @@ void GuiApplication::gotoBookmark(unsigned int idx, bool openFile,
 void GuiApplication::reconfigure(string const & option)
 {
        // emit message signal.
-       if (current_view_)
+       if (current_view_) {
                current_view_->message(_("Running configure..."));
+               current_view_->setCursor(Qt::WaitCursor);
+       }
 
        // Run configure in user lyx directory
        string const lock_file = package().getConfigureLockName();
@@ -1540,6 +1694,9 @@ void GuiApplication::reconfigure(string const & option)
        LaTeXPackages::getAvailable();
        fileUnlock(fd, lock_file.c_str());
 
+       if (current_view_)
+               current_view_->unsetCursor();
+
        if (ret)
                Alert::information(_("System reconfiguration failed"),
                           _("The system reconfiguration has failed.\n"
@@ -1559,7 +1716,7 @@ void GuiApplication::validateCurrentView()
                // currently at least one view exists but no view has the focus.
                // choose the last view to make it current.
                // a view without any open document is preferred.
-               GuiView * candidate = 0;
+               GuiView * candidate = nullptr;
                QHash<int, GuiView *>::const_iterator it = d->views_.begin();
                QHash<int, GuiView *>::const_iterator end = d->views_.end();
                for (; it != end; ++it) {
@@ -1612,9 +1769,10 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                break;
 
        case LFUN_WINDOW_CLOSE:
+               // FIXME: this is done also in GuiView::closeBuffer()!
                // update bookmark pit of the current buffer before window close
-               for (size_t i = 0; i < theSession().bookmarks().size(); ++i)
-                       gotoBookmark(i+1, false, false);
+               for (size_t i = 1; i < theSession().bookmarks().size(); ++i)
+                       gotoBookmark(i, false, false);
                // clear the last opened list, because
                // maybe this will end the session
                theSession().lastOpened().clear();
@@ -1646,7 +1804,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
        case LFUN_BUFFER_NEW:
                validateCurrentView();
                if (!current_view_
-                  || (!lyxrc.open_buffers_in_tabs && current_view_->documentBufferView() != 0)) {
+                  || (!lyxrc.open_buffers_in_tabs && current_view_->documentBufferView() != nullptr)) {
                        createView(QString(), false); // keep hidden
                        current_view_->newDocument(to_utf8(cmd.argument()));
                        current_view_->show();
@@ -1661,7 +1819,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                string const temp = cmd.getArg(1);
                validateCurrentView();
                if (!current_view_
-                  || (!lyxrc.open_buffers_in_tabs && current_view_->documentBufferView() != 0)) {
+                  || (!lyxrc.open_buffers_in_tabs && current_view_->documentBufferView() != nullptr)) {
                        createView();
                        current_view_->newDocument(file, temp, true);
                        if (!current_view_->documentBufferView())
@@ -1677,18 +1835,16 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                //   current_view_ is not null.
                validateCurrentView();
                // FIXME: create a new method shared with LFUN_HELP_OPEN.
-               string const fname = to_utf8(cmd.argument());
+               string const fname = trim(to_utf8(cmd.argument()), "\"");
                bool const is_open = FileName::isAbsolute(fname)
                        && theBufferList().getBuffer(FileName(fname));
                if (!current_view_
                    || (!lyxrc.open_buffers_in_tabs
-                       && current_view_->documentBufferView() != 0
+                       && current_view_->documentBufferView() != nullptr
                        && !is_open)) {
                        // We want the ui session to be saved per document and not per
                        // window number. The filename crc is a good enough identifier.
-                       boost::crc_32_type crc;
-                       crc = for_each(fname.begin(), fname.end(), crc);
-                       createView(crc.checksum());
+                       createView(support::checksum(fname));
                        current_view_->openDocument(fname);
                        if (!current_view_->documentBufferView())
                                current_view_->close();
@@ -1710,7 +1866,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 
        case LFUN_HELP_OPEN: {
                // FIXME: create a new method shared with LFUN_FILE_OPEN.
-               if (current_view_ == 0)
+               if (current_view_ == nullptr)
                        createView();
                string const arg = to_utf8(cmd.argument());
                if (arg.empty()) {
@@ -1734,13 +1890,33 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                break;
        }
 
+       case LFUN_LYXFILES_OPEN: {
+               // This is the actual reason for this method (#12106).
+               validateCurrentView();
+               if (!current_view_
+                  || (!lyxrc.open_buffers_in_tabs
+                      && current_view_->documentBufferView() != nullptr))
+                       createView();
+               string arg = to_utf8(cmd.argument());
+               if (arg.empty())
+                       // set default
+                       arg = "templates";
+               if (arg != "templates" && arg != "examples") {
+                       current_view_->message(_("Wrong argument. Must be 'examples' or 'templates'."));
+                       break;
+               }
+               lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW, "lyxfiles " + arg));
+               break;
+       }
+
        case LFUN_SET_COLOR: {
                string const lyx_name = cmd.getArg(0);
-               string const x11_name = cmd.getArg(1);
+               string x11_name = cmd.getArg(1);
+               string x11_darkname = cmd.getArg(2);
                if (lyx_name.empty() || x11_name.empty()) {
                        if (current_view_)
                                current_view_->message(
-                                       _("Syntax: set-color <lyx_name> <x11_name>"));
+                                       _("Syntax: set-color <lyx_name> <x11_name> <x11_darkname>"));
                        break;
                }
 
@@ -1753,7 +1929,11 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                        graphics::GCache::get().changeDisplay(true);
 #endif
 
-               if (!lcolor.setColor(lyx_name, x11_name)) {
+               if (x11_darkname.empty() && colorCache().isDarkMode()) {
+                       x11_darkname = x11_name;
+                       x11_name.clear();
+               }
+               if (!lcolor.setColor(lyx_name, x11_name, x11_darkname)) {
                        if (current_view_)
                                current_view_->message(
                                        bformat(_("Set-color \"%1$s\" failed "
@@ -1878,7 +2058,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                string arg = argument;
                // FIXME: this LFUN should also work without any view.
                Buffer * buffer = (current_view_ && current_view_->documentBufferView())
-                                 ? &(current_view_->documentBufferView()->buffer()) : 0;
+                                 ? &(current_view_->documentBufferView()->buffer()) : nullptr;
                // This handles undo groups automagically
                UndoGroupHelper ugh(buffer);
                while (!arg.empty()) {
@@ -1908,7 +2088,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                        // all of the buffers might be locally hidden. That is, there is no
                        // active buffer.
                        if (!view || !view->currentBufferView())
-                               activeBuffers[view] = 0;
+                               activeBuffers[view] = nullptr;
                        else
                                activeBuffers[view] = &view->currentBufferView()->buffer();
 
@@ -1933,7 +2113,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 
                GuiView * const homeView = currentView();
                Buffer * b = theBufferList().first();
-               Buffer * nextBuf = 0;
+               Buffer * nextBuf = nullptr;
                int numProcessed = 0;
                while (true) {
                        if (b != last)
@@ -2036,9 +2216,8 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                DocumentClassConstPtr olddc = defaults.params().documentClassPtr();
                int const unknown_tokens = defaults.readHeader(lex);
                DocumentClassConstPtr newdc = defaults.params().documentClassPtr();
-               ErrorList el;
                InsetText & theinset = static_cast<InsetText &>(defaults.inset());
-               cap::switchBetweenClasses(olddc, newdc, theinset, el);
+               cap::switchBetweenClasses(olddc, newdc, theinset);
 
                if (unknown_tokens != 0) {
                        lyxerr << "Warning in LFUN_BUFFER_SAVE_AS_DEFAULT!\n"
@@ -2065,6 +2244,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 
        case LFUN_BOOKMARK_CLEAR:
                theSession().bookmarks().clear();
+               dr.screenUpdate(Update::Force);
                break;
 
        case LFUN_DEBUG_LEVEL_SET:
@@ -2084,7 +2264,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                        // is not terminated when closing the last view.
                        // Create a new one to be able to dispatch the
                        // LFUN_DIALOG_SHOW to this view.
-                       if (current_view_ == 0)
+                       if (current_view_ == nullptr)
                                createView();
                }
        }
@@ -2097,6 +2277,11 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                break;
        }
 
+       if (current_view_ && current_view_->isFullScreen()) {
+               if (current_view_->menuBar()->isVisible() && lyxrc.full_screen_menubar)
+                       current_view_->menuBar()->hide();
+       }
+
        if (cmd.origin() == FuncRequest::LYXSERVER)
                updateCurrentView(cmd, dr);
 }
@@ -2179,7 +2364,8 @@ bool GuiApplication::queryKeySym(KeySymbol const & keysym,
                // seq has been reset at this point
                func = seq.addkey(keysym, NoModifier);
 
-       LYXERR(Debug::KEY, " Key (queried) [action=" << func.action() << "]["
+       LYXERR(Debug::KEY, " Key (queried) [action="
+              << lyxaction.getActionName(func.action()) << "]["
               << seq.print(KeySequence::Portable) << ']');
        return func.action() != LFUN_UNKNOWN_ACTION;
 }
@@ -2206,7 +2392,8 @@ void GuiApplication::processKeySym(KeySymbol const & keysym, KeyModifier state)
        d->cancel_meta_seq.reset();
 
        FuncRequest func = d->cancel_meta_seq.addkey(keysym, state);
-       LYXERR(Debug::KEY, "action first set to [" << func.action() << ']');
+       LYXERR(Debug::KEY, "action first set to ["
+              << lyxaction.getActionName(func.action()) << ']');
 
        // When not cancel or meta-fake, do the normal lookup.
        // Note how the meta_fake Mod1 bit is OR-ed in and reset afterwards.
@@ -2214,7 +2401,8 @@ void GuiApplication::processKeySym(KeySymbol const & keysym, KeyModifier state)
        if ((func.action() != LFUN_CANCEL) && (func.action() != LFUN_META_PREFIX)) {
                // remove Caps Lock and Mod2 as a modifiers
                func = d->keyseq.addkey(keysym, (state | d->meta_fake_bit));
-               LYXERR(Debug::KEY, "action now set to [" << func.action() << ']');
+               LYXERR(Debug::KEY, "action now set to ["
+                      << lyxaction.getActionName(func.action()) << ']');
        }
 
        // Don't remove this unless you know what you are doing.
@@ -2224,8 +2412,9 @@ void GuiApplication::processKeySym(KeySymbol const & keysym, KeyModifier state)
        if (func.action() == LFUN_NOACTION)
                func = FuncRequest(LFUN_COMMAND_PREFIX);
 
-       LYXERR(Debug::KEY, " Key [action=" << func.action() << "]["
-               << d->keyseq.print(KeySequence::Portable) << ']');
+       LYXERR(Debug::KEY, " Key [action="
+              << lyxaction.getActionName(func.action()) << "]["
+              << d->keyseq.print(KeySequence::Portable) << ']');
 
        // already here we know if it any point in going further
        // why not return already here if action == -1 and
@@ -2242,7 +2431,7 @@ void GuiApplication::processKeySym(KeySymbol const & keysym, KeyModifier state)
                // If addkey looked up a command and did not find further commands then
                // seq has been reset at this point
                func = d->keyseq.addkey(keysym, NoModifier);
-               LYXERR(Debug::KEY, "Action now " << func.action());
+               LYXERR(Debug::KEY, "Action now " << lyxaction.getActionName(func.action()));
        }
 
        if (func.action() == LFUN_UNKNOWN_ACTION) {
@@ -2359,7 +2548,7 @@ void GuiApplication::resetGui()
                return;
 
        if (d->global_menubar_)
-               d->menus_.fillMenuBar(d->global_menubar_, 0, false);
+               d->menus_.fillMenuBar(d->global_menubar_, nullptr, false);
 
        QHash<int, GuiView *>::iterator it;
        for (it = d->views_.begin(); it != d->views_.end(); ++it) {
@@ -2419,6 +2608,7 @@ void GuiApplication::createView(QString const & geometry_arg, bool autoShow,
                int x, y;
                int w, h;
                QChar sx, sy;
+#if QT_VERSION < 0x060000
                QRegExp re( "[=]*(?:([0-9]+)[xX]([0-9]+)){0,1}[ ]*(?:([+-][0-9]*)){0,1}(?:([+-][0-9]*)){0,1}" );
                re.indexIn(geometry_arg);
                w = re.cap(1).toInt();
@@ -2427,6 +2617,16 @@ void GuiApplication::createView(QString const & geometry_arg, bool autoShow,
                y = re.cap(4).toInt();
                sx = re.cap(3).isEmpty() ? '+' : re.cap(3).at(0);
                sy = re.cap(4).isEmpty() ? '+' : re.cap(4).at(0);
+#else
+               QRegularExpression re( "[=]*(?:([0-9]+)[xX]([0-9]+)){0,1}[ ]*(?:([+-][0-9]*)){0,1}(?:([+-][0-9]*)){0,1}" );
+               QRegularExpressionMatch match = re.match(geometry_arg);
+               w = match.captured(1).toInt();
+               h = match.captured(2).toInt();
+               x = match.captured(3).toInt();
+               y = match.captured(4).toInt();
+               sx = match.captured(3).isEmpty() ? '+' : match.captured(3).at(0);
+               sy = match.captured(4).isEmpty() ? '+' : match.captured(4).at(0);
+#endif
                // Set initial geometry such that we can get the frame size.
                view->setGeometry(x, y, w, h);
                int framewidth = view->geometry().x() - view->x();
@@ -2434,7 +2634,11 @@ void GuiApplication::createView(QString const & geometry_arg, bool autoShow,
                // Negative displacements must be interpreted as distances
                // from the right or bottom screen borders.
                if (sx == '-' || sy == '-') {
+#if QT_VERSION < 0x060000
                        QRect rec = QApplication::desktop()->screenGeometry();
+#else
+                       QRect rec = QGuiApplication::primaryScreen()->geometry();
+#endif
                        if (sx == '-')
                                x += rec.width() - w - framewidth;
                        if (sy == '-')
@@ -2546,7 +2750,11 @@ void GuiApplication::setGuiLanguage()
        // opposite. Therefore, long name should be used without truncation.
        // c.f. http://doc.trolltech.com/4.1/qtranslator.html#load
        if (!d->qt_trans_.load(language_name,
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+                       QLibraryInfo::path(QLibraryInfo::TranslationsPath))) {
+#else
                        QLibraryInfo::location(QLibraryInfo::TranslationsPath))) {
+#endif
                LYXERR(Debug::LOCALE, "Could not find Qt translations for locale "
                        << language_name);
        } else {
@@ -2580,7 +2788,7 @@ void GuiApplication::execBatchCommands()
 #if QT_VERSION > 0x040600
        setAttribute(Qt::AA_MacDontSwapCtrlAndMeta,lyxrc.mac_dontswap_ctrl_meta);
 #endif
-#if QT_VERSION > 0x050100
+#if QT_VERSION >= 0x050000 && QT_VERSION < 0x060000
        setAttribute(Qt::AA_UseHighDpiPixmaps,true);
 #endif
        // Create the global default menubar which is shown for the dialogs
@@ -2647,11 +2855,9 @@ void GuiApplication::restoreGuiSession()
        for (auto const & last : lastopened) {
                FileName const & file_name = last.file_name;
                if (!current_view_ || (!lyxrc.open_buffers_in_tabs
-                         && current_view_->documentBufferView() != 0)) {
-                       boost::crc_32_type crc;
+                         && current_view_->documentBufferView() != nullptr)) {
                        string const & fname = file_name.absFileName();
-                       crc = for_each(fname.begin(), fname.end(), crc);
-                       createView(crc.checksum());
+                       createView(support::checksum(fname));
                }
                current_view_->loadDocument(file_name, false);
 
@@ -2819,6 +3025,11 @@ bool GuiApplication::notify(QObject * receiver, QEvent * event)
        return false;
 }
 
+bool GuiApplication::isInDarkMode()
+{
+       return colorCache().isDarkMode();
+}
+
 
 bool GuiApplication::getRgbColor(ColorCode col, RGBColor & rgbcol)
 {
@@ -2913,7 +3124,7 @@ void GuiApplication::unregisterView(GuiView * gv)
        if(d->views_.contains(gv->id()) && d->views_.value(gv->id()) == gv) {
                d->views_.remove(gv->id());
                if (current_view_ == gv)
-                       current_view_ = 0;
+                       current_view_ = nullptr;
        }
 }
 
@@ -2970,7 +3181,7 @@ void GuiApplication::hideDialogs(string const & name, Inset * inset) const
 
 Buffer const * GuiApplication::updateInset(Inset const * inset) const
 {
-       Buffer const * buf = 0;
+       Buffer const * buf = nullptr;
        QHash<int, GuiView *>::const_iterator end = d->views_.end();
        for (QHash<int, GuiView *>::iterator it = d->views_.begin(); it != end; ++it) {
                if (Buffer const * ptr = (*it)->updateInset(inset))
@@ -2983,7 +3194,7 @@ Buffer const * GuiApplication::updateInset(Inset const * inset) const
 bool GuiApplication::searchMenu(FuncRequest const & func,
        docstring_list & names) const
 {
-       BufferView * bv = 0;
+       BufferView * bv = nullptr;
        if (current_view_)
                bv = current_view_->currentBufferView();
        return d->menus_.searchMenu(func, names, bv);
@@ -3002,7 +3213,7 @@ static QStringList uifiles;
 static QStringList toolbar_uifiles;
 
 
-GuiApplication::ReturnValues GuiApplication::readUIFile(FileName ui_path)
+GuiApplication::ReturnValues GuiApplication::readUIFile(FileName const & ui_path)
 {
        enum {
                ui_menuset = 1,
@@ -3204,6 +3415,36 @@ void GuiApplication::onLastWindowClosed()
 }
 
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
+void GuiApplication::onApplicationStateChanged(Qt::ApplicationState state)
+{
+       std::string name = "unknown";
+       switch (state) {
+       case Qt::ApplicationSuspended:
+               name = "ApplicationSuspended";
+               break;
+       case Qt::ApplicationHidden:
+               name = "ApplicationHidden";
+               break;
+       case Qt::ApplicationInactive:
+               name = "ApplicationInactive";
+               break;
+       case Qt::ApplicationActive:
+               name = "ApplicationActive";
+               /// The Dock icon click produces 2 sequential QEvent::ApplicationStateChangeEvent events.
+               /// cmd+tab only one QEvent::ApplicationStateChangeEvent event
+               if (d->views_.empty() && d->last_state_ == state) {
+                       LYXERR(Debug::GUI, "Open new window...");
+                       createView();
+               }
+               break;
+       }
+       LYXERR(Debug::GUI, "onApplicationStateChanged..." << name);
+       d->last_state_ = state;
+}
+#endif
+
+
 void GuiApplication::startLongOperation() {
        d->key_checker_.start();
 }