Issue #261: About translation to Korean

CMakeLists.txt

@@ -46,13 +46,15 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 include(GNUInstallDirs)
 
+find_package(Qt6 REQUIRED COMPONENTS Core LinguistTools)
+
 if(PDF4QT_BUILD_ONLY_CORE_LIBRARY)
     find_package(Qt6 REQUIRED COMPONENTS Core Gui Svg Xml)
 else()
     find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets Svg Xml PrintSupport TextToSpeech Test)
 endif()
 
-qt_standard_project_setup()
+qt_standard_project_setup(I18N_TRANSLATED_LANGUAGES en de cs es ko)
 
 find_package(OpenSSL REQUIRED)
 find_package(lcms2 REQUIRED)
@@ -140,12 +142,33 @@ if(NOT PDF4QT_BUILD_ONLY_CORE_LIBRARY)
     add_subdirectory(WixInstaller)
 endif()
 
+qt_collect_translation_source_targets(i18n_targets)
+message("CMAKE_TRANSLATION_TARGETS = " ${i18n_targets})
+
+set(PDF4QT_TRANSLATION_TS_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/translations)
+set(PDF4QT_TRANSLATION_QM_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${PDF4QT_INSTALL_BIN_DIR}/translations)
+
+message("PDF4QT_TRANSLATION_TS_OUTPUT_DIRECTORY" ${PDF4QT_TRANSLATION_TS_OUTPUT_DIRECTORY})
+message("PDF4QT_TRANSLATION_QM_OUTPUT_DIRECTORY" ${PDF4QT_TRANSLATION_QM_OUTPUT_DIRECTORY})
+
+qt_add_translations(TARGETS Pdf4QtEditor Pdf4QtViewer Pdf4QtPageMaster Pdf4QtDiff PdfTool
+                    SOURCE_TARGETS ${i18n_targets}
+                    MERGE_QT_TRANSLATIONS
+                    TS_OUTPUT_DIRECTORY ${PDF4QT_TRANSLATION_TS_OUTPUT_DIRECTORY}
+                    QM_OUTPUT_DIRECTORY ${PDF4QT_TRANSLATION_QM_OUTPUT_DIRECTORY}
+                    QM_FILES_OUTPUT_VARIABLE pdf4qt_qm_files)
+
 message("CMAKE_PREFIX_PATH = " ${CMAKE_PREFIX_PATH})
 message("CMAKE_TOOLCHAIN_FILE = " ${CMAKE_TOOLCHAIN_FILE})
 
 configure_file(version.txt.in version.txt)
 
 if(NOT PDF4QT_BUILD_ONLY_CORE_LIBRARY)
+    install(DIRECTORY ${PDF4QT_TRANSLATION_QM_OUTPUT_DIRECTORY}
+            RUNTIME DESTINATION ${PDF4QT_INSTALL_BIN_DIR}
+            FILES_MATCHING
+            PATTERN *.qm)
+
     if(WIN32)
         install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/Desktop/44x44/
                 RUNTIME DESTINATION ${PDF4QT_INSTALL_BIN_DIR}/assets/44x44

Pdf4QtDiff/aboutdialog.ui

@@ -36,7 +36,7 @@
       <bool>true</bool>
      </property>
      <property name="html">
-      <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
+      <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
 hr { height: 1px; border-width: 0; }
@@ -225,10 +225,10 @@ li.checked::marker { content: &quot;\2612&quot;; }
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
-      <enum>Qt::Horizontal</enum>
+      <enum>Qt::Orientation::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::StandardButton::Ok</set>
      </property>
     </widget>
    </item>

Pdf4QtDiff/main.cpp

@@ -18,6 +18,7 @@
 #include "pdfconstants.h"
 #include "pdfdocumentreader.h"
 #include "pdfsecurityhandler.h"
+#include "pdfapplicationtranslator.h"
 #include "mainwindow.h"
 
 #include <QApplication>
@@ -49,6 +50,9 @@ int main(int argc, char *argv[])
         pdf::PDFSecurityHandler::setNoDRMMode();
     }
 
+    pdf::PDFApplicationTranslator translator;
+    translator.installTranslator();
+
     QIcon appIcon(":/app-icon.svg");
     QApplication::setWindowIcon(appIcon);
 

Pdf4QtEditor/main.cpp

@@ -1,4 +1,4 @@
-//    Copyright (C) 2021-2024 Jakub Melka
+//    Copyright (C) 2021-2025 Jakub Melka
 //
 //    This file is part of PDF4QT.
 //
@@ -20,6 +20,7 @@
 #include "pdfsecurityhandler.h"
 #include "pdfwidgetutils.h"
 #include "pdfviewersettings.h"
+#include "pdfapplicationtranslator.h"
 
 #include <QSettings>
 #include <QApplication>
@@ -60,6 +61,10 @@ int main(int argc, char *argv[])
         pdf::PDFSecurityHandler::setNoDRMMode();
     }
 
+    pdf::PDFApplicationTranslator translator;
+    translator.loadSettings();
+    translator.installTranslator();
+
     bool isLightGui = false;
     bool isDarkGui = false;
     const pdfviewer::PDFViewerSettings::ColorScheme colorScheme = pdfviewer::PDFViewerSettings::getColorSchemeStatic();

Pdf4QtEditorPlugins/AudioBookPlugin/audiobookcreator.cpp

@@ -17,6 +17,8 @@
 
 #include "audiobookcreator.h"
 
+#include <QTextStream>
+
 #ifdef Q_OS_WIN
 #include <windows.h>
 #include <sapi.h>

Pdf4QtLibCore/CMakeLists.txt

@@ -153,6 +153,8 @@ add_library(Pdf4QtLibCore SHARED
     sources/pdfpagecontenteditorprocessor.cpp
     sources/pdfpagecontenteditorcontentstreambuilder.h
     sources/pdfpagecontenteditorcontentstreambuilder.cpp
+    sources/pdfapplicationtranslator.h
+    sources/pdfapplicationtranslator.cpp
 )
 
 include(GenerateExportHeader)

Pdf4QtLibCore/sources/pdfapplicationtranslator.cpp

@@ -0,0 +1,166 @@
+//    Copyright (C) 2025-2025 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT 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 Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfapplicationtranslator.h"
+
+#include <QDir>
+#include <QSettings>
+#include <QMetaEnum>
+#include <QCoreApplication>
+
+namespace pdf
+{
+
+PDFApplicationTranslator::PDFApplicationTranslator()
+{
+
+}
+
+PDFApplicationTranslator::~PDFApplicationTranslator()
+{
+    uninstallTranslator();
+}
+
+PDFApplicationTranslator::ELanguage PDFApplicationTranslator::getLanguage() const
+{
+    return m_language;
+}
+
+void PDFApplicationTranslator::installTranslator()
+{
+    QDir applicationDirectory(QCoreApplication::applicationDirPath());
+    applicationDirectory.cd("translations");
+    QString translationPath = applicationDirectory.absolutePath();
+
+    Q_ASSERT(!m_translator);
+    m_translator = new QTranslator();
+
+    switch (m_language)
+    {
+        case E_LANGUAGE_AUTOMATIC_SELECTION:
+        {
+            if (m_translator->load(QLocale::system(), "PDF4QT", "_", translationPath))
+            {
+                QCoreApplication::installTranslator(m_translator);
+            }
+            else
+            {
+                delete m_translator;
+                m_translator = nullptr;
+            }
+            break;
+        }
+
+        case E_LANGUAGE_ENGLISH:
+        case E_LANGUAGE_CZECH:
+        case E_LANGUAGE_GERMAN:
+        case E_LANGUAGE_KOREAN:
+        case E_LANGUAGE_SPANISH:
+        {
+            QString languageFileName = getLanguageFileName();
+
+            if (m_translator->load(languageFileName, translationPath))
+            {
+                QCoreApplication::installTranslator(m_translator);
+            }
+            else
+            {
+                delete m_translator;
+                m_translator = nullptr;
+            }
+            break;
+        }
+
+        default:
+        {
+            delete m_translator;
+            m_translator = nullptr;
+
+            Q_ASSERT(false);
+            break;
+        }
+    }
+}
+
+void PDFApplicationTranslator::uninstallTranslator()
+{
+    if (m_translator)
+    {
+        QCoreApplication::removeTranslator(m_translator);
+
+        delete m_translator;
+        m_translator = nullptr;
+    }
+}
+
+void PDFApplicationTranslator::loadSettings()
+{
+    QMetaEnum metaEnum = QMetaEnum::fromType<ELanguage>();
+    std::string languageKeyString = loadLanguageKeyFromSettings().toStdString();
+    std::optional<quint64> value = metaEnum.keyToValue(languageKeyString.c_str());
+    m_language = static_cast<ELanguage>(value.value_or(E_LANGUAGE_AUTOMATIC_SELECTION));
+}
+
+void PDFApplicationTranslator::saveSettings()
+{
+    QMetaEnum metaEnum = QMetaEnum::fromType<ELanguage>();
+    QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
+    settings.beginGroup("Language");
+    settings.setValue("language", metaEnum.valueToKey(m_language));
+    settings.endGroup();
+}
+
+void PDFApplicationTranslator::setLanguage(ELanguage newLanguage)
+{
+    m_language = newLanguage;
+}
+
+QString PDFApplicationTranslator::loadLanguageKeyFromSettings()
+{
+    QMetaEnum metaEnum = QMetaEnum::fromType<ELanguage>();
+    QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
+    settings.beginGroup("Language");
+    QString languageKey = settings.value("language", metaEnum.valueToKey(E_LANGUAGE_AUTOMATIC_SELECTION)).toString();
+    settings.endGroup();
+
+    return languageKey;
+}
+
+QString PDFApplicationTranslator::getLanguageFileName() const
+{
+    switch (m_language)
+    {
+        case E_LANGUAGE_ENGLISH:
+            return QLatin1String("PDF4QT_en.qm");
+        case E_LANGUAGE_CZECH:
+            return QLatin1String("PDF4QT_cs.qm");
+        case E_LANGUAGE_GERMAN:
+            return QLatin1String("PDF4QT_de.qm");
+        case E_LANGUAGE_KOREAN:
+            return QLatin1String("PDF4QT_es.qm");
+        case E_LANGUAGE_SPANISH:
+            return QLatin1String("PDF4QT_ko.qm");
+            break;
+
+        default:
+            Q_ASSERT(false);
+    }
+
+    return QString();
+}
+
+}   // namespace

Pdf4QtLibCore/sources/pdfapplicationtranslator.h

@@ -0,0 +1,66 @@
+//    Copyright (C) 2025-2025 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT 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 Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFAPPLICATIONTRANSLATOR_H
+#define PDFAPPLICATIONTRANSLATOR_H
+
+#include "pdfglobal.h"
+
+#include <QTranslator>
+
+namespace pdf
+{
+
+class PDF4QTLIBCORESHARED_EXPORT PDFApplicationTranslator
+{
+    Q_GADGET
+
+public:
+    explicit PDFApplicationTranslator();
+    ~PDFApplicationTranslator();
+
+    enum ELanguage
+    {
+        E_LANGUAGE_AUTOMATIC_SELECTION,
+        E_LANGUAGE_ENGLISH,
+        E_LANGUAGE_CZECH,
+        E_LANGUAGE_GERMAN,
+        E_LANGUAGE_KOREAN,
+        E_LANGUAGE_SPANISH
+    };
+
+    Q_ENUM(ELanguage)
+
+    void installTranslator();
+    void uninstallTranslator();
+    void loadSettings();
+    void saveSettings();
+
+    ELanguage getLanguage() const;
+    void setLanguage(ELanguage newLanguage);
+
+private:
+    QString loadLanguageKeyFromSettings();
+    QString getLanguageFileName() const;
+
+    QTranslator* m_translator = nullptr;
+    ELanguage m_language = E_LANGUAGE_AUTOMATIC_SELECTION;
+};
+
+}   // namespace
+
+#endif // PDFAPPLICATIONTRANSLATOR_H

Pdf4QtLibCore/sources/pdfdocumentsanitizer.cpp

@@ -161,7 +161,7 @@ void PDFDocumentSanitizer::performSanitizeMetadata()
 
     PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Unknown, objects.begin(), objects.end(), processEntry);
     m_storage.setObjects(qMove(objects));
-    Q_EMIT sanitizationProgress(tr("Metadata streams removed: %1").arg(counter));
+    Q_EMIT sanitizationProgress(tr("Metadata streams removed: %1").arg(counter.load()));
 }
 
 void PDFDocumentSanitizer::performSanitizeOutline()

Pdf4QtLibCore/sources/pdfoptimizer.cpp

@@ -23,8 +23,8 @@
 #include "pdfconstants.h"
 #include "pdfdocumentbuilder.h"
 #include "pdfstreamfilters.h"
-#include "pdfdbgheap.h"
 #include "pdfdocumentwriter.h"
+#include "pdfdbgheap.h"
 
 namespace pdf
 {
@@ -194,7 +194,7 @@ bool PDFOptimizer::performDereferenceSimpleObjects()
 
     PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Unknown, objects.begin(), objects.end(), processEntry);
     m_storage.setObjects(qMove(objects));
-    Q_EMIT optimizationProgress(tr("Simple objects dereferenced and embedded: %1").arg(counter));
+    Q_EMIT optimizationProgress(tr("Simple objects dereferenced and embedded: %1").arg(counter.load()));
 
     return false;
 }
@@ -213,7 +213,7 @@ bool PDFOptimizer::performRemoveNullObjects()
 
     PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Unknown, objects.begin(), objects.end(), processEntry);
     m_storage.setObjects(qMove(objects));
-    Q_EMIT optimizationProgress(tr("Null objects entries from dictionaries removed: %1").arg(counter));
+    Q_EMIT optimizationProgress(tr("Null objects entries from dictionaries removed: %1").arg(counter.load()));
 
     return false;
 }
@@ -238,7 +238,7 @@ bool PDFOptimizer::performRemoveUnusedObjects()
 
     PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Unknown, range.begin(), range.end(), processEntry);
     m_storage.setObjects(qMove(objects));
-    Q_EMIT optimizationProgress(tr("Unused objects removed: %1").arg(counter));
+    Q_EMIT optimizationProgress(tr("Unused objects removed: %1").arg(counter.load()));
 
     return counter > 0;
 }
@@ -311,7 +311,7 @@ bool PDFOptimizer::performMergeIdenticalObjects()
     }
 
     m_storage.setObjects(qMove(objects));
-    Q_EMIT optimizationProgress(tr("Identical objects merged: %1").arg(counter));
+    Q_EMIT optimizationProgress(tr("Identical objects merged: %1").arg(counter.load()));
 
     return counter > 0;
 }
@@ -457,7 +457,7 @@ bool PDFOptimizer::performRecompressFlateStreams()
 
     PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Unknown, objects.begin(), objects.end(), processEntry);
     m_storage.setObjects(qMove(objects));
-    Q_EMIT optimizationProgress(tr("Bytes saved by recompressing stream: %1").arg(bytesSaved));
+    Q_EMIT optimizationProgress(tr("Bytes saved by recompressing stream: %1").arg(bytesSaved.load()));
 
     return false;
 }

Pdf4QtLibGui/pdfaboutdialog.ui

@@ -36,7 +36,7 @@
       <bool>true</bool>
      </property>
      <property name="html">
-      <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
+      <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
 hr { height: 1px; border-width: 0; }
@@ -225,10 +225,10 @@ li.checked::marker { content: &quot;\2612&quot;; }
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
-      <enum>Qt::Horizontal</enum>
+      <enum>Qt::Orientation::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::StandardButton::Ok</set>
      </property>
     </widget>
    </item>

Pdf4QtLibGui/pdfcreatebitonaldocumentdialog.cpp

@@ -101,106 +101,6 @@ void PDFCreateBitonalDocumentPreviewWidget::setImage(QImage image)
     update();
 }
 
-class ImagePreviewDelegate : public QStyledItemDelegate
-{
-public:
-    ImagePreviewDelegate(std::vector<PDFCreateBitonalDocumentDialog::ImageConversionInfo>* imageConversionInfos, QObject* parent) :
-        QStyledItemDelegate(parent),
-        m_imageConversionInfos(imageConversionInfos)
-    {
-        m_yesRenderer.load(QString(":/resources/result-ok.svg"));
-        m_noRenderer.load(QString(":/resources/result-error.svg"));
-    }
-
-    virtual void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override
-    {
-        QStyledItemDelegate::paint(painter, option, index);
-
-        QRect markRect = getMarkRect(option);
-
-        if (index.isValid())
-        {
-            const PDFCreateBitonalDocumentDialog::ImageConversionInfo& info = m_imageConversionInfos->at(index.row());
-            if (info.conversionEnabled)
-            {
-                m_yesRenderer.render(painter, markRect);
-            }
-            else
-            {
-                m_noRenderer.render(painter, markRect);
-            }
-        }
-    }
-
-    virtual bool editorEvent(QEvent* event,
-                             QAbstractItemModel* model,
-                             const QStyleOptionViewItem& option,
-                             const QModelIndex& index)
-    {
-        Q_UNUSED(model);
-        Q_UNUSED(index);
-
-        if (event->type() == QEvent::MouseButtonPress && index.isValid())
-        {
-            QMouseEvent* mouseEvent = dynamic_cast<QMouseEvent*>(event);
-            if (mouseEvent && mouseEvent->button() == Qt::LeftButton)
-            {
-                // Do we click on yes/no mark?
-                QRectF markRect = getMarkRect(option);
-                if (markRect.contains(mouseEvent->position()))
-                {
-                    PDFCreateBitonalDocumentDialog::ImageConversionInfo& info = m_imageConversionInfos->at(index.row());
-                    info.conversionEnabled = !info.conversionEnabled;
-                    return true;
-                }
-            }
-        }
-
-        return false;
-    }
-
-    virtual bool helpEvent(QHelpEvent* event,
-                           QAbstractItemView* view,
-                           const QStyleOptionViewItem& option,
-                           const QModelIndex& index) override
-    {
-        Q_UNUSED(index);
-
-        if (!event || !view)
-        {
-            return false;
-        }
-
-        if (event->type() == QEvent::ToolTip)
-        {
-            // Are we hovering over yes/no mark?
-            QRectF markRect = getMarkRect(option);
-            if (markRect.contains(event->pos()))
-            {
-                event->accept();
-                QToolTip::showText(event->globalPos(), tr("Toggle this icon to switch image conversion to bitonal format on or off."), view);
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-private:
-    static constexpr QSize s_iconSize = QSize(24, 24);
-
-    QRect getMarkRect(const QStyleOptionViewItem& option) const
-    {
-        QSize markSize = pdf::PDFWidgetUtils::scaleDPI(option.widget, s_iconSize);
-        QRect markRect(option.rect.left(), option.rect.top(), markSize.width(), markSize.height());
-        return markRect;
-    }
-
-    std::vector<PDFCreateBitonalDocumentDialog::ImageConversionInfo>* m_imageConversionInfos;
-    mutable QSvgRenderer m_yesRenderer;
-    mutable QSvgRenderer m_noRenderer;
-};
-
 PDFCreateBitonalDocumentDialog::PDFCreateBitonalDocumentDialog(const pdf::PDFDocument* document,
                                                                const pdf::PDFCMS* cms,
                                                                pdf::PDFProgress* progress,
@@ -506,6 +406,89 @@ std::optional<pdf::PDFImage> PDFCreateBitonalDocumentDialog::getImageFromReferen
     return pdfImage;
 }
 
+ImagePreviewDelegate::ImagePreviewDelegate(std::vector<PDFCreateBitonalDocumentDialog::ImageConversionInfo>* imageConversionInfos, QObject *parent) :
+    QStyledItemDelegate(parent),
+    m_imageConversionInfos(imageConversionInfos)
+{
+    m_yesRenderer.load(QString(":/resources/result-ok.svg"));
+    m_noRenderer.load(QString(":/resources/result-error.svg"));
+}
+
+void ImagePreviewDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    QStyledItemDelegate::paint(painter, option, index);
+
+    QRect markRect = getMarkRect(option);
+
+    if (index.isValid())
+    {
+        const PDFCreateBitonalDocumentDialog::ImageConversionInfo& info = m_imageConversionInfos->at(index.row());
+        if (info.conversionEnabled)
+        {
+            m_yesRenderer.render(painter, markRect);
+        }
+        else
+        {
+            m_noRenderer.render(painter, markRect);
+        }
+    }
+}
+
+bool ImagePreviewDelegate::editorEvent(QEvent* event, QAbstractItemModel* model, const QStyleOptionViewItem& option, const QModelIndex& index)
+{
+    Q_UNUSED(model);
+    Q_UNUSED(index);
+
+    if (event->type() == QEvent::MouseButtonPress && index.isValid())
+    {
+        QMouseEvent* mouseEvent = dynamic_cast<QMouseEvent*>(event);
+        if (mouseEvent && mouseEvent->button() == Qt::LeftButton)
+        {
+            // Do we click on yes/no mark?
+            QRectF markRect = getMarkRect(option);
+            if (markRect.contains(mouseEvent->position()))
+            {
+                PDFCreateBitonalDocumentDialog::ImageConversionInfo& info = m_imageConversionInfos->at(index.row());
+                info.conversionEnabled = !info.conversionEnabled;
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+bool ImagePreviewDelegate::helpEvent(QHelpEvent* event, QAbstractItemView* view, const QStyleOptionViewItem& option, const QModelIndex& index)
+{
+    Q_UNUSED(index);
+
+    if (!event || !view)
+    {
+        return false;
+    }
+
+    if (event->type() == QEvent::ToolTip)
+    {
+        // Are we hovering over yes/no mark?
+        QRectF markRect = getMarkRect(option);
+        if (markRect.contains(event->pos()))
+        {
+            event->accept();
+            QToolTip::showText(event->globalPos(), tr("Toggle this icon to switch image conversion to bitonal format on or off."), view);
+            return true;
+        }
+    }
+
+    return false;
+}
+
+QRect ImagePreviewDelegate::getMarkRect(const QStyleOptionViewItem& option) const
+{
+    QSize markSize = pdf::PDFWidgetUtils::scaleDPI(option.widget, s_iconSize);
+    QRect markRect(option.rect.left(), option.rect.top(), markSize.width(), markSize.height());
+    return markRect;
+}
+
 }   // namespace pdfviewer
 
 

Pdf4QtLibGui/pdfcreatebitonaldocumentdialog.h

@@ -27,7 +27,9 @@
 
 #include <QDialog>
 #include <QFuture>
+#include <QSvgRenderer>
 #include <QFutureWatcher>
+#include <QStyledItemDelegate>
 
 namespace Ui
 {
@@ -110,6 +112,34 @@ private:
     int m_manualThreshold = 128;
 };
 
+class ImagePreviewDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+public:
+    ImagePreviewDelegate(std::vector<PDFCreateBitonalDocumentDialog::ImageConversionInfo>* imageConversionInfos, QObject* parent);
+
+    virtual void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+
+    virtual bool editorEvent(QEvent* event,
+                             QAbstractItemModel* model,
+                             const QStyleOptionViewItem& option,
+                             const QModelIndex& index) override;
+
+    virtual bool helpEvent(QHelpEvent* event,
+                           QAbstractItemView* view,
+                           const QStyleOptionViewItem& option,
+                           const QModelIndex& index) override;
+
+private:
+    static constexpr QSize s_iconSize = QSize(24, 24);
+
+    QRect getMarkRect(const QStyleOptionViewItem& option) const;
+
+    std::vector<PDFCreateBitonalDocumentDialog::ImageConversionInfo>* m_imageConversionInfos;
+    mutable QSvgRenderer m_yesRenderer;
+    mutable QSvgRenderer m_noRenderer;
+};
+
 }   // namespace pdfviewer
 
 #endif // PDFCREATEBITONALDOCUMENTDIALOG_H

Pdf4QtPageMaster/aboutdialog.ui

@@ -36,7 +36,7 @@
       <bool>true</bool>
      </property>
      <property name="html">
-      <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
+      <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
 hr { height: 1px; border-width: 0; }
@@ -225,10 +225,10 @@ li.checked::marker { content: &quot;\2612&quot;; }
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
-      <enum>Qt::Horizontal</enum>
+      <enum>Qt::Orientation::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::StandardButton::Ok</set>
      </property>
     </widget>
    </item>

Pdf4QtPageMaster/main.cpp

@@ -18,6 +18,7 @@
 #include "pdfconstants.h"
 #include "pdfsecurityhandler.h"
 #include "pdfwidgetutils.h"
+#include "pdfapplicationtranslator.h"
 #include "mainwindow.h"
 
 #include <QApplication>
@@ -54,6 +55,9 @@ int main(int argc, char *argv[])
 
     pdf::PDFWidgetUtils::setDarkTheme(parser.isSet(lightGui), parser.isSet(darkGui));
 
+    pdf::PDFApplicationTranslator translator;
+    translator.installTranslator();
+
     QIcon appIcon(":/app-icon.svg");
     QApplication::setWindowIcon(appIcon);
 

Pdf4QtViewer/main.cpp

@@ -20,6 +20,7 @@
 #include "pdfsecurityhandler.h"
 #include "pdfwidgetutils.h"
 #include "pdfviewersettings.h"
+#include "pdfapplicationtranslator.h"
 
 #include <QApplication>
 #include <QCommandLineParser>
@@ -53,6 +54,10 @@ int main(int argc, char *argv[])
         pdf::PDFSecurityHandler::setNoDRMMode();
     }
 
+    pdf::PDFApplicationTranslator translator;
+    translator.loadSettings();
+    translator.installTranslator();
+
     bool isLightGui = false;
     bool isDarkGui = false;
     const pdfviewer::PDFViewerSettings::ColorScheme colorScheme = pdfviewer::PDFViewerSettings::getColorSchemeStatic();