Merge branch 'QT6' into master

initial release to Qt6 TODO: -remove KCoreAddons -remove KWidgetsAddons * QT6: (24 commits) QT6: No Qt::AA_EnableHighDpiScaling in QT6 QT6: TeDo mod QList for DeleteQGraphicsItemCommand QT6: Todo Fix QtConcurrent (remove KCoreAddons?) QT6: Todo QVariant::setValue QT6: std::min needs further tweaking QPrinting class needs further tweaking QT6: QStyleOptionGraphicsItem Add QActionGroup QT6: QStyleOptionGraphicsItem QT6: QLibraryInfo Totest QRegularExpression ok? QT6: QStyleOptionGraphicsItem QT6: QMouseEvent QT6: QDropEvent QT6: Fix deprecated QRegExp QT6: hooks added QT6: Mod unused function put in comments Add missing include QActionGroup QT6: set C++17 QT6: diagramitemweight set val to Font::Weight ...
2025-12-21 00:30:53 +01:00 · 2020-10-03 16:18:03 +02:00
parent 3b71cb7dfe 9f3c173b9f
commit f5d2fc3916
32 changed files with 1124 additions and 691 deletions
--- a/SingleApplication/singleapplication.pri
+++ b/SingleApplication/singleapplication.pri
@@ -1,5 +1,5 @@
 QT += core network
-CONFIG += c++11
+CONFIG += c++17

 HEADERS += $$PWD/singleapplication.h \
    $$PWD/singleapplication_p.h
--- a/SingleApplication/singleapplication_p.cpp
+++ b/SingleApplication/singleapplication_p.cpp
@@ -43,9 +43,9 @@
 #include "singleapplication_p.h"

 #ifdef Q_OS_UNIX
-    #include <unistd.h>
-    #include <sys/types.h>
-    #include <pwd.h>
+	#include <unistd.h>
+	#include <sys/types.h>
+	#include <pwd.h>
 #endif

 #ifdef Q_OS_WIN
@@ -218,7 +218,22 @@ void SingleApplicationPrivate::connectToPrimary( int msecs, ConnectionType conne
 		writeStream << blockServerName.toLatin1();
 		writeStream << static_cast<quint8>(connectionType);
 		writeStream << instanceNumber;
-		quint16 checksum = qChecksum(initMsg.constData(), static_cast<quint32>(initMsg.length()));
+
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+		quint16 checksum =
+				qChecksum(
+					initMsg.constData(),
+					static_cast<quint32>(initMsg.length()));
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+		quint16 checksum =
+				qChecksum(
+					QByteArrayView(
+						initMsg.constData(),
+						static_cast<quint32>(initMsg.length())));
+#endif
 		writeStream << checksum;

 		// The header indicates the message length that follows
@@ -239,10 +254,21 @@ void SingleApplicationPrivate::connectToPrimary( int msecs, ConnectionType conne

 quint16 SingleApplicationPrivate::blockChecksum()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	return qChecksum(
 				static_cast <const char *>( memory->data() ),
 				offsetof( InstancesInfo, checksum )
 				);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	return qChecksum(
+				QByteArrayView(
+					static_cast <const char *>( memory->data() ),
+					offsetof( InstancesInfo, checksum )));
+
+#endif
 }

 qint64 SingleApplicationPrivate::primaryPid()
@@ -366,8 +392,21 @@ void SingleApplicationPrivate::readInitMessageBody( QLocalSocket *sock )
 	quint16 msgChecksum = 0;
 	readStream >> msgChecksum;

-	const quint16 actualChecksum = qChecksum( msgBytes.constData(), static_cast<quint32>( msgBytes.length() - sizeof( quint16 ) ) );
-	
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	const quint16 actualChecksum =
+			qChecksum(
+				msgBytes.constData(),
+				static_cast<quint32>( msgBytes.length() - sizeof( quint16 ) ) );
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	const quint16 actualChecksum =
+			qChecksum(
+				QByteArrayView(
+					msgBytes.constData(),
+					static_cast<quint32>(msgBytes.length() - sizeof(quint16))));
+#endif
 	bool isValid = readStream.status() == QDataStream::Ok &&
 			QLatin1String(latin1Name) == blockServerName &&
 			msgChecksum == actualChecksum;
--- a/qelectrotech.pro
+++ b/qelectrotech.pro
@@ -220,7 +220,7 @@ UI_SOURCES_DIR = sources/ui/
 UI_HEADERS_DIR = sources/ui/

 # Configuration de la compilation
-CONFIG += c++11 debug_and_release warn_on
+CONFIG += c++17 debug_and_release warn_on

 # Nom du binaire genere par la compilation
 TARGET = qelectrotech
@@ -229,8 +229,8 @@ TARGET = qelectrotech
 unix:QMAKE_LIBS_THREAD -= -lpthread
 unix|win32: LIBS += -lsqlite3

-# Enable C++11
-QMAKE_CXXFLAGS += -std=c++11
+# Enable C++17
+QMAKE_CXXFLAGS += -std=c++17

 # Description de l'installation
 target.path        = $$join(INSTALL_PREFIX,,,$${QET_BINARY_PATH})
--- a/sources/ElementsCollection/elementslocation.cpp
+++ b/sources/ElementsCollection/elementslocation.cpp
@@ -144,11 +144,23 @@ bool ElementsLocation::operator!=(const ElementsLocation &other) const
 */
 QString ElementsLocation::baseName() const
 {
-	QRegExp regexp("^.*([^/]+)\\.elmt$");
-	if (regexp.exactMatch(m_collection_path)) {
-		return(regexp.capturedTexts().at(1));
+	QRegularExpression regexp("^.*(?<name>[^/]+)\\.elmt$");
+	if (!regexp.isValid())
+	{
+		qWarning() <<"this is an error in the code"
+			  << regexp.errorString()
+			  << regexp.patternErrorOffset();
+		return QString();
 	}
-	return(QString());
+
+	QRegularExpressionMatch match = regexp.match(m_collection_path);
+	if (!match.hasMatch())
+	{
+		qDebug()<<"no Match => return"
+			<<m_collection_path;
+		return QString();
+	}
+	return match.captured("name");
 }

 /**
@@ -183,9 +195,9 @@ QString ElementsLocation::projectCollectionPath() const
 		return QString();
 	else
 		return QString("project"
-			       + QString::number(QETApp::projectId(m_project))
-			       + "+"
-			       + collectionPath());
+				   + QString::number(QETApp::projectId(m_project))
+				   + "+"
+				   + collectionPath());
 }

 /**
@@ -254,7 +266,7 @@ void ElementsLocation::setPath(const QString &path)
 		if (!match.hasMatch())
 		{
 			qDebug()<<"no Match => return"
-			       <<tmp_path;
+				   <<tmp_path;
 			return;
 		}
 		bool conv_ok;
@@ -344,7 +356,7 @@ bool ElementsLocation::addToPath(const QString &string)
 	if (m_collection_path.endsWith(".elmt", Qt::CaseInsensitive))
 	{
 		qDebug() << "ElementsLocation::addToPath :"
-			    " Can't add string to the path of an element";
+				" Can't add string to the path of an element";
 		return(false);
 	}

@@ -368,12 +380,22 @@ bool ElementsLocation::addToPath(const QString &string)
 ElementsLocation ElementsLocation::parent() const
 {
 	ElementsLocation copy(*this);
-	QRegExp re1("^([a-z]+://)(.*)/*$");
-	if (re1.exactMatch(m_collection_path)) {
-		QString path_proto = re1.capturedTexts().at(1);
-		QString path_path = re1.capturedTexts().at(2);
-		QString parent_path = path_path.remove(QRegExp("/*[^/]+$"));
-		copy.setPath(path_proto + parent_path);
+	QRegularExpression re ("^(?<path_proto>[a-z]+://.*)/.*$");
+	if (!re.isValid())
+	{
+		qWarning()
+			<<QObject::tr("this is an error in the code")
+			<< re.errorString()
+			<< re.patternErrorOffset();
+	}
+	QRegularExpressionMatch match = re.match(m_collection_path);
+	if (!match.hasMatch())
+	{
+		qDebug()
+			<<"no Match => return"
+			<<m_collection_path;
+	}else {
+		copy.setPath(match.captured("path_proto"));
 	}
 	return(copy);
 }
@@ -700,7 +722,7 @@ bool ElementsLocation::setXml(const QDomDocument &xml_document) const
 	if (xml_document.documentElement().tagName() != "definition")
 	{
 		qDebug() << "ElementsLocation::setXml :"
-			    " tag name of document element isn't 'definition'";
+				" tag name of document element isn't 'definition'";
 		return false;
 	}

@@ -734,6 +756,7 @@ bool ElementsLocation::setXml(const QDomDocument &xml_document) const
 		//Element doesn't exist, we create the element
 		else
 		{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 			QString path_ = collectionPath(false);
 			QRegExp rx ("^(.*)/(.*\\.elmt)$");

@@ -748,9 +771,14 @@ bool ElementsLocation::setXml(const QDomDocument &xml_document) const
 			}
 			else {
 				qDebug() << "ElementsLocation::setXml :"
-					    " rx don't match";
+						" rx don't match";
 			}
-
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+		qDebug()<<"Help code for QT 6 or later";
+#endif
 		}
 	}

@@ -863,7 +891,7 @@ QDebug operator<< (QDebug debug, const ElementsLocation &location)
 	QString msg;
 	msg += "ElementsLocation(";
 	msg += (location.isProject()? location.projectCollectionPath()
-				    : location.collectionPath(true));
+					: location.collectionPath(true));
 	msg += location.exist()? ", true" : ", false";
 	msg +=")";

--- a/sources/createdxf.cpp
+++ b/sources/createdxf.cpp
@@ -439,11 +439,11 @@ int Createdxf::getcolorCode (const long red, const long green, const long blue)
 }

 int Createdxf::dxfColor(QColor color) {
-    return Createdxf::getcolorCode(color.red(), color.green(), color.blue());
+	return Createdxf::getcolorCode(color.red(), color.green(), color.blue());
 }

 int Createdxf::dxfColor(QPen pen) {
-    return Createdxf::dxfColor(pen.color());
+	return Createdxf::dxfColor(pen.color());
 }

 void Createdxf::drawArcEllipse(
@@ -613,9 +613,9 @@ void Createdxf::drawRectangle (
 		double height,
 		const int &colour)
 {
-    QRectF rect(x1,y1,width,height);
-    QPolygonF poly(rect);
-    drawPolyline(fileName,poly,colour,true);
+	QRectF rect(x1,y1,width,height);
+	QPolygonF poly(rect);
+	drawPolyline(fileName,poly,colour,true);
 }


@@ -678,16 +678,16 @@ void Createdxf::drawArc(
 }

 /**
-    @brief Createdxf::drawText
-    draw simple text in dxf format without any alignment specified
-    @param fileName
-    @param text
-    @param x
-    @param y
-    @param height
-    @param rotation
-    @param colour
-    @param xScaleW = 1
+	@brief Createdxf::drawText
+	draw simple text in dxf format without any alignment specified
+	@param fileName
+	@param text
+	@param x
+	@param y
+	@param height
+	@param rotation
+	@param colour
+	@param xScaleW = 1
 */
 void Createdxf::drawText(
 	const QString& fileName,
@@ -699,40 +699,40 @@ void Createdxf::drawText(
 	int colour,
 	double xScaleW)
 {
-    if (!fileName.isEmpty()) {
+	if (!fileName.isEmpty()) {
 	QFile file(fileName);
 	if (!file.open(QFile::Append)) {
-	    // error message
-	    QMessageBox errorFileOpen;
-	    errorFileOpen.setText("Error: File "+fileName+" was not written correctly.");
-	    errorFileOpen.setInformativeText("Close all Files and Re-Run");
-	    errorFileOpen.exec();
+		// error message
+		QMessageBox errorFileOpen;
+		errorFileOpen.setText("Error: File "+fileName+" was not written correctly.");
+		errorFileOpen.setInformativeText("Close all Files and Re-Run");
+		errorFileOpen.exec();
 	} else {
-	    QTextStream To_Dxf(&file);
-	    // Draw the text
-	    To_Dxf << 0         << "\r\n";
-	    To_Dxf << "TEXT"    << "\r\n";
-	    To_Dxf << 8         << "\r\n";
-	    To_Dxf << 0         << "\r\n";    // Layer number (default layer in autocad)
-	    To_Dxf << 62        << "\r\n";
-	    To_Dxf << colour    << "\r\n";    // Colour Code
-	    To_Dxf << 10        << "\r\n";    // XYZ
-	    To_Dxf << x         << "\r\n";    // X in UCS (User Coordinate System)coordinates
-	    To_Dxf << 20        << "\r\n";
-	    To_Dxf << y         << "\r\n";    // Y in UCS (User Coordinate System)coordinates
-	    To_Dxf << 30        << "\r\n";
-	    To_Dxf << 0.0       << "\r\n";    // Z in UCS (User Coordinate System)coordinates
-	    To_Dxf << 40        << "\r\n";
-	    To_Dxf << height    << "\r\n";    // Text Height
-	    To_Dxf << 41        << "\r\n";
-	    To_Dxf << xScaleW    << "\r\n";    // X Scale
-	    To_Dxf << 1         << "\r\n";
-	    To_Dxf << text      << "\r\n";    // Text Value
-	    To_Dxf << 50        << "\r\n";
-	    To_Dxf << rotation  << "\r\n";    // Text Rotation
-	    file.close();
+		QTextStream To_Dxf(&file);
+		// Draw the text
+		To_Dxf << 0         << "\r\n";
+		To_Dxf << "TEXT"    << "\r\n";
+		To_Dxf << 8         << "\r\n";
+		To_Dxf << 0         << "\r\n";    // Layer number (default layer in autocad)
+		To_Dxf << 62        << "\r\n";
+		To_Dxf << colour    << "\r\n";    // Colour Code
+		To_Dxf << 10        << "\r\n";    // XYZ
+		To_Dxf << x         << "\r\n";    // X in UCS (User Coordinate System)coordinates
+		To_Dxf << 20        << "\r\n";
+		To_Dxf << y         << "\r\n";    // Y in UCS (User Coordinate System)coordinates
+		To_Dxf << 30        << "\r\n";
+		To_Dxf << 0.0       << "\r\n";    // Z in UCS (User Coordinate System)coordinates
+		To_Dxf << 40        << "\r\n";
+		To_Dxf << height    << "\r\n";    // Text Height
+		To_Dxf << 41        << "\r\n";
+		To_Dxf << xScaleW    << "\r\n";    // X Scale
+		To_Dxf << 1         << "\r\n";
+		To_Dxf << text      << "\r\n";    // Text Value
+		To_Dxf << 50        << "\r\n";
+		To_Dxf << rotation  << "\r\n";    // Text Rotation
+		file.close();
+	}
 	}
-    }
 }

 /* draw aligned text in DXF Format */
@@ -778,7 +778,7 @@ void Createdxf::drawTextAligned(
 			To_Dxf << 40        << "\r\n";
 			To_Dxf << height    << "\r\n";    // Text Height
 			To_Dxf << 41        << "\r\n";
-	    To_Dxf << xScaleW    << "\r\n";    // X Scale
+		To_Dxf << xScaleW    << "\r\n";    // X Scale
 			To_Dxf << 1         << "\r\n";
 			To_Dxf << text      << "\r\n";    // Text Value
 			To_Dxf << 50        << "\r\n";
@@ -832,42 +832,42 @@ void Createdxf::drawPolyline(const QString &filepath,
 	const QPolygonF &poly,
 	const int &colorcode, bool preScaled)
 {
-    qreal x,y;
-    if (!filepath.isEmpty()) {
+	qreal x,y;
+	if (!filepath.isEmpty()) {
 	QFile file(filepath);
 	if (!file.open(QFile::Append)) {
-	    // error message
-	    QMessageBox errorFileOpen;
-	    errorFileOpen.setText("Error: File "+filepath+" was not written correctly.");
-	    errorFileOpen.setInformativeText("Close all Files and Re-Run");
-	    errorFileOpen.exec();
+		// error message
+		QMessageBox errorFileOpen;
+		errorFileOpen.setText("Error: File "+filepath+" was not written correctly.");
+		errorFileOpen.setInformativeText("Close all Files and Re-Run");
+		errorFileOpen.exec();
 	} else {
-	    QTextStream To_Dxf(&file);
-	    // Draw the Line
-	    To_Dxf << 0         << "\r\n";
-	    To_Dxf << "POLYLINE"    << "\r\n";
-	    To_Dxf << 8         << "\r\n";
-	    To_Dxf << 0         << "\r\n";    // Layer number (default layer in autocad)
-	    To_Dxf << 62        << "\r\n";
-	    To_Dxf << colorcode    << "\r\n";    // Colour Code
-	    To_Dxf << 66        << "\r\n";
-	    To_Dxf << 1         << "\r\n";
-	    To_Dxf << 70        << "\r\n";
-	    To_Dxf << 8         << "\r\n";
-	    To_Dxf << 10        << "\r\n";
-	    To_Dxf << 0         << "\r\n";
-	    To_Dxf << 20         << "\r\n";
-	    To_Dxf << 0         << "\r\n";
-	    To_Dxf << 30        << "\r\n";
-	    To_Dxf << 0        << "\r\n";
-	    foreach(QPointF p, poly)
-	    {
+		QTextStream To_Dxf(&file);
+		// Draw the Line
+		To_Dxf << 0         << "\r\n";
+		To_Dxf << "POLYLINE"    << "\r\n";
+		To_Dxf << 8         << "\r\n";
+		To_Dxf << 0         << "\r\n";    // Layer number (default layer in autocad)
+		To_Dxf << 62        << "\r\n";
+		To_Dxf << colorcode    << "\r\n";    // Colour Code
+		To_Dxf << 66        << "\r\n";
+		To_Dxf << 1         << "\r\n";
+		To_Dxf << 70        << "\r\n";
+		To_Dxf << 8         << "\r\n";
+		To_Dxf << 10        << "\r\n";
+		To_Dxf << 0         << "\r\n";
+		To_Dxf << 20         << "\r\n";
+		To_Dxf << 0         << "\r\n";
+		To_Dxf << 30        << "\r\n";
+		To_Dxf << 0        << "\r\n";
+		foreach(QPointF p, poly)
+		{
 		if(preScaled) {
-		    x = p.x();
-		    y = p.y();
+			x = p.x();
+			y = p.y();
 		} else {
-		    x = p.x() * xScale;
-		    y = sheetHeight - (p.y() * yScale);
+			x = p.x() * xScale;
+			y = sheetHeight - (p.y() * yScale);
 		}

 		To_Dxf << 0         << "\r\n";
@@ -882,16 +882,16 @@ void Createdxf::drawPolyline(const QString &filepath,
 		To_Dxf << y         << "\r\n";    // Y in UCS (User Coordinate System)coordinates
 		To_Dxf << 30        << "\r\n";
 		To_Dxf << 0.0       << "\r\n";    // Z in UCS (User Coordinate System)coordinates
-	    }
+		}

-	    To_Dxf << 0         << "\r\n";
-	    To_Dxf << "SEQEND"  << "\r\n";
-	    To_Dxf << 8         << "\r\n";
-	    To_Dxf << 0         << "\r\n";    // Layer number (default layer in autocad)
+		To_Dxf << 0         << "\r\n";
+		To_Dxf << "SEQEND"  << "\r\n";
+		To_Dxf << 8         << "\r\n";
+		To_Dxf << 0         << "\r\n";    // Layer number (default layer in autocad)

-	    file.close();
+		file.close();
+	}
 	}
-    }
 }

 /* ================================================
@@ -951,7 +951,7 @@ void Createdxf::drawEllipse(
 	const QRectF &rect,
 	const int &colorcode)
 {
-    drawArcEllipse(
+	drawArcEllipse(
 		filepath,
 		rect.topLeft().x() * xScale,
 		sheetHeight - (rect.topLeft().y() * yScale),
@@ -961,38 +961,38 @@ void Createdxf::drawEllipse(
 }

 /**
-    @brief Createdxf::drawRectangle
-    Convenience function for draw rectangle
-    @param filepath
-    @param rect
-    @param colorcode
+	@brief Createdxf::drawRectangle
+	Convenience function for draw rectangle
+	@param filepath
+	@param rect
+	@param colorcode
 */
 void Createdxf::drawRectangle(
 	const QString &filepath,
 	const QRectF &rect,
 	const int &colorcode) {
-    //QPolygonF poly(scaleRect(rect));
-    QPolygonF poly(rect);
-    drawPolyline(filepath,poly,colorcode);
+	//QPolygonF poly(scaleRect(rect));
+	QPolygonF poly(rect);
+	drawPolyline(filepath,poly,colorcode);
 }

 /**
-    @brief Createdxf::drawPolygon
-    Convenience function for draw polygon
-    @param filepath
-    @param poly
-    @param colorcode
+	@brief Createdxf::drawPolygon
+	Convenience function for draw polygon
+	@param filepath
+	@param poly
+	@param colorcode
 */
 void Createdxf::drawPolygon(
 	const QString &filepath,
 	const QPolygonF &poly,
 	const int &colorcode)
 {
-    QPolygonF pg = poly;
-    if(!poly.isClosed()) {
+	QPolygonF pg = poly;
+	if(!poly.isClosed()) {
 	pg << poly.at(0); // Close it
-    }
-    drawPolyline(filepath,pg,colorcode);
+	}
+	drawPolyline(filepath,pg,colorcode);
 }

 /**
@@ -1015,9 +1015,9 @@ void Createdxf::drawText(
 	int colour,
 	double xScaleW)
 {
-    qreal x = point.x() * xScale;
-    qreal y = sheetHeight - (point.y() * yScale);
-    drawText(fileName,text,x,y,height * yScale,rotation,colour,xScaleW);
+	qreal x = point.x() * xScale;
+	qreal y = sheetHeight - (point.y() * yScale);
+	drawText(fileName,text,x,y,height * yScale,rotation,colour,xScaleW);
 }
 void Createdxf::drawArcEllipse(
 	const QString &file_path,
@@ -1028,23 +1028,23 @@ void Createdxf::drawArcEllipse(
 	qreal rotation_angle,
 	const int &colorcode)
 {
-    qreal x = rect.x() * xScale;
-    qreal y = sheetHeight - rect.y() * yScale;
-    qreal w = rect.width() * xScale;
-    qreal h = rect.height() * yScale;
-    qreal hotspot_x = hotspot.x() * xScale;
-    qreal hotspot_y = sheetHeight - hotspot.y() * yScale;
-    drawArcEllipse(file_path,x,y,w,h,startAngle,spanAngle,hotspot_x,hotspot_y,rotation_angle,colorcode);
+	qreal x = rect.x() * xScale;
+	qreal y = sheetHeight - rect.y() * yScale;
+	qreal w = rect.width() * xScale;
+	qreal h = rect.height() * yScale;
+	qreal hotspot_x = hotspot.x() * xScale;
+	qreal hotspot_y = sheetHeight - hotspot.y() * yScale;
+	drawArcEllipse(file_path,x,y,w,h,startAngle,spanAngle,hotspot_x,hotspot_y,rotation_angle,colorcode);
 }

 /*
 * Utility functions
 */
-static QRectF scaleRect(QRectF rect)
-{
-    QRectF ro(rect.bottomLeft().x() * Createdxf::xScale,
-		Createdxf::sheetHeight - (rect.bottomLeft().y() * Createdxf::yScale),
-		rect.width() * Createdxf::xScale,
-		rect.height() * Createdxf::yScale);
-    return ro;
-}
+//static QRectF scaleRect(QRectF rect)
+//{
+//    QRectF ro(rect.bottomLeft().x() * Createdxf::xScale,
+//		Createdxf::sheetHeight - (rect.bottomLeft().y() * Createdxf::yScale),
+//		rect.width() * Createdxf::xScale,
+//		rect.height() * Createdxf::yScale);
+//    return ro;
+//}
--- a/sources/diagramview.cpp
+++ b/sources/diagramview.cpp
@@ -34,6 +34,8 @@
 #include "changetitleblockcommand.h"
 #include "conductorcreator.h"

+#include <QDropEvent>
+
 /**
 	Constructeur
 	@param diagram Schema a afficher ; si diagram vaut 0, un nouveau Diagram est utilise
@@ -200,7 +202,19 @@ void DiagramView::handleElementDrop(QDropEvent *event)
 		return;
 	}

-	diagram()->setEventInterface(new DiagramEventAddElement(location, diagram(), mapToScene(event->pos())));
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	diagram()->setEventInterface(
+				new DiagramEventAddElement(
+					location, diagram(), mapToScene(event->pos())));
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	diagram()->setEventInterface(
+				new DiagramEventAddElement(
+					location, diagram(), event->position()));
+#endif
+
 		//Set focus to the view to get event
 	this->setFocus();
 }
@@ -268,7 +282,19 @@ void DiagramView::handleTextDrop(QDropEvent *e) {
 		iti -> setHtml (e -> mimeData() -> text());
 	}

-	m_diagram -> undoStack().push(new AddItemCommand<IndependentTextItem *>(iti, m_diagram, mapToScene(e->pos())));
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+
+	m_diagram -> undoStack().push(
+				new AddItemCommand<IndependentTextItem *>(
+					iti, m_diagram, mapToScene(e->pos())));
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	m_diagram -> undoStack().push(
+				new AddItemCommand<IndependentTextItem *>(
+					iti, m_diagram, e->position()));
+#endif
 }

 /**
@@ -423,7 +449,14 @@ void DiagramView::mousePressEvent(QMouseEvent *e)
 	if (m_event_interface && m_event_interface->mousePressEvent(e)) return;

 		//Start drag view when hold the middle button
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	if (e->button() == Qt::MidButton)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (e->button() == Qt::MiddleButton)
+#endif
 	{
 		m_drag_last_pos = e->pos();
 		viewport()->setCursor(Qt::ClosedHandCursor);
@@ -473,7 +506,14 @@ void DiagramView::mouseMoveEvent(QMouseEvent *e)
 	if (m_event_interface && m_event_interface->mouseMoveEvent(e)) return;

 		//Drag the view
-	if (e->buttons() == Qt::MidButton)
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (e->button() == Qt::MidButton)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (e->button() == Qt::MiddleButton)
+#endif
 	{
 		QScrollBar *h = horizontalScrollBar();
 		QScrollBar *v = verticalScrollBar();
@@ -534,7 +574,14 @@ void DiagramView::mouseReleaseEvent(QMouseEvent *e)
 	if (m_event_interface && m_event_interface->mouseReleaseEvent(e)) return;

 		//Stop drag view
-	if (e -> button() == Qt::MidButton)
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (e->button() == Qt::MidButton)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (e->button() == Qt::MiddleButton)
+#endif
 	{
 		viewport()->setCursor(Qt::ArrowCursor);
 	}
@@ -567,7 +614,15 @@ void DiagramView::mouseReleaseEvent(QMouseEvent *e)
 			});
 			QMenu *menu = new QMenu(this);
 			menu->addAction(act);
+
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 			menu->popup(e->globalPos());
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+			menu->popup(e->pos());
+#endif
 		}

 		m_free_rubberbanding = false;
--- a/sources/editor/elementview.cpp
+++ b/sources/editor/elementview.cpp
@@ -373,7 +373,14 @@ ElementContent ElementView::pasteWithOffset(const QDomDocument &xml_document) {
 	@param e QMouseEvent decrivant l'evenement souris
 */
 void ElementView::mousePressEvent(QMouseEvent *e) {
-	if (e->buttons() == Qt::MidButton)
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (e->button() == Qt::MidButton)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (e->button() == Qt::MiddleButton)
+#endif
 	{
 		setCursor( (Qt::ClosedHandCursor));
 		reference_view_ = e->pos();
@@ -387,7 +394,14 @@ void ElementView::mousePressEvent(QMouseEvent *e) {
 	Manage the event move mouse
 */
 void ElementView::mouseMoveEvent(QMouseEvent *e) {
-	if (e->buttons() == Qt::MidButton)
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (e->button() == Qt::MidButton)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (e->button() == Qt::MiddleButton)
+#endif
 	{
 		QScrollBar *h = horizontalScrollBar();
 		QScrollBar *v = verticalScrollBar();
@@ -405,7 +419,15 @@ void ElementView::mouseMoveEvent(QMouseEvent *e) {
 	Manage event release click mouse
 */
 void ElementView::mouseReleaseEvent(QMouseEvent *e) {
-	if (e -> button() == Qt::MidButton) {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (e->button() == Qt::MidButton)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (e->button() == Qt::MiddleButton)
+#endif
+	{
 		setCursor(Qt::ArrowCursor);
 		adjustSceneRect();
 		return;
--- a/sources/editor/graphicspart/partarc.cpp
+++ b/sources/editor/graphicspart/partarc.cpp
@@ -61,7 +61,14 @@ void PartArc::paint(QPainter *painter, const QStyleOptionGraphicsItem *options,
 		//Always remove the brush
 	painter -> setBrush(Qt::NoBrush);
 	QPen t = painter -> pen();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	t.setCosmetic(options && options -> levelOfDetail < 1.0);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	t.setCosmetic(options && options -> levelOfDetailFromTransform(painter->worldTransform()) < 1.0);
+#endif
 	painter -> setPen(t);

 	if (isSelected())
--- a/sources/editor/graphicspart/partellipse.cpp
+++ b/sources/editor/graphicspart/partellipse.cpp
@@ -55,8 +55,15 @@ void PartEllipse::paint(QPainter *painter, const QStyleOptionGraphicsItem *optio
 	applyStylesToQPainter(*painter);

 	QPen t = painter -> pen();
-	t.setCosmetic(options && options -> levelOfDetail < 1.0);

+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	t.setCosmetic(options && options -> levelOfDetail < 1.0);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	t.setCosmetic(options && options -> levelOfDetailFromTransform(painter->worldTransform()) < 1.0);
+#endif
 	if (isSelected())
 		t.setColor(Qt::red);

--- a/sources/editor/graphicspart/partline.cpp
+++ b/sources/editor/graphicspart/partline.cpp
@@ -79,8 +79,15 @@ void PartLine::paint(QPainter *painter, const QStyleOptionGraphicsItem *options,
 	applyStylesToQPainter(*painter);
 	QPen t = painter -> pen();
 	t.setJoinStyle(Qt::MiterJoin);
-	t.setCosmetic(options && options -> levelOfDetail < 1.0);

+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	t.setCosmetic(options && options -> levelOfDetail < 1.0);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	t.setCosmetic(options && options -> levelOfDetailFromTransform(painter->worldTransform()) < 1.0);
+#endif
 	if (isSelected()) t.setColor(Qt::red);

 	painter -> setPen(t);
--- a/sources/editor/graphicspart/partpolygon.cpp
+++ b/sources/editor/graphicspart/partpolygon.cpp
@@ -66,7 +66,14 @@ void PartPolygon::paint(QPainter *painter, const QStyleOptionGraphicsItem *optio
 	applyStylesToQPainter(*painter);

 	QPen t = painter -> pen();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	t.setCosmetic(options && options -> levelOfDetail < 1.0);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	t.setCosmetic(options && options -> levelOfDetailFromTransform(painter->worldTransform()) < 1.0);
+#endif
 	if (isSelected()) t.setColor(Qt::red);
 	painter -> setPen(t);

--- a/sources/editor/graphicspart/partrectangle.cpp
+++ b/sources/editor/graphicspart/partrectangle.cpp
@@ -51,8 +51,14 @@ void PartRectangle::paint(QPainter *painter, const QStyleOptionGraphicsItem *opt
 	Q_UNUSED(widget);
 	applyStylesToQPainter(*painter);
 	QPen t = painter -> pen();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	t.setCosmetic(options && options -> levelOfDetail < 1.0);
-
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	t.setCosmetic(options && options -> levelOfDetailFromTransform(painter->worldTransform()) < 1.0);
+#endif
 	if (isSelected())
 		t.setColor(Qt::red);

--- a/sources/editor/graphicspart/partterminal.cpp
+++ b/sources/editor/graphicspart/partterminal.cpp
@@ -62,37 +62,52 @@ const QDomElement PartTerminal::toXml(QDomDocument &xml_document) const

 /**
 	Dessine la borne
-	@param p QPainter a utiliser pour rendre le dessin
+	@param painter QPainter a utiliser pour rendre le dessin
 	@param options Options pour affiner le rendu
 	@param widget Widget sur lequel le rendu est effectue
 */
-void PartTerminal::paint(QPainter *p, const QStyleOptionGraphicsItem *options, QWidget *widget) {
+void PartTerminal::paint(
+		QPainter *painter,
+		const QStyleOptionGraphicsItem *options,
+		QWidget *widget)
+{
 	Q_UNUSED(widget);
-	p -> save();
+	painter -> save();

 	// annulation des renderhints
-	p -> setRenderHint(QPainter::Antialiasing,          false);
-	p -> setRenderHint(QPainter::TextAntialiasing,      false);
-	p -> setRenderHint(QPainter::SmoothPixmapTransform, false);
+	painter -> setRenderHint(QPainter::Antialiasing,          false);
+	painter -> setRenderHint(QPainter::TextAntialiasing,      false);
+	painter -> setRenderHint(QPainter::SmoothPixmapTransform, false);

 	QPen t;
 	t.setWidthF(1.0);
-	t.setCosmetic(options && options -> levelOfDetail < 1.0);

+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	t.setCosmetic(options && options -> levelOfDetail < 1.0);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	t.setCosmetic(
+				options
+				&& options->levelOfDetailFromTransform(
+					painter->worldTransform())
+				< 1.0);
+#endif
 	// dessin de la borne en rouge
 	t.setColor(isSelected() ? Terminal::neutralColor : Qt::red);
-	p -> setPen(t);
-	p -> drawLine(QPointF(0.0, 0.0), d -> second_point);
+	painter -> setPen(t);
+	painter -> drawLine(QPointF(0.0, 0.0), d -> second_point);

 	// dessin du point d'amarrage au conducteur en bleu
 	t.setColor(isSelected() ? Qt::red : Terminal::neutralColor);
-	p -> setPen(t);
-	p -> setBrush(Terminal::neutralColor);
-	p -> drawPoint(QPointF(0.0, 0.0));
-	p -> restore();
+	painter -> setPen(t);
+	painter -> setBrush(Terminal::neutralColor);
+	painter -> drawPoint(QPointF(0.0, 0.0));
+	painter -> restore();

 	if (m_hovered)
-		drawShadowShape(p);
+		drawShadowShape(painter);
 }

 /**
--- a/sources/editor/graphicspart/partterminal.h
+++ b/sources/editor/graphicspart/partterminal.h
@@ -55,7 +55,10 @@ class PartTerminal : public CustomElementGraphicPart {
 		QString xmlName() const override { return(QString("terminal")); }
 		void fromXml(const QDomElement &) override;
 		const QDomElement toXml(QDomDocument &) const override;
-		void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) override;
+		void paint(
+				QPainter *painter,
+				const QStyleOptionGraphicsItem *,
+				QWidget *) override;

 		QPainterPath shape() const override;
 		QPainterPath shadowShape() const override {return shape();}
--- a/sources/editor/qetelementeditor.cpp
+++ b/sources/editor/qetelementeditor.cpp
@@ -1471,7 +1471,14 @@ void QETElementEditor::slot_createPartsList()
 				QString part_desc = cep -> name();
 				QListWidgetItem *qlwi = new QListWidgetItem(part_desc);
 				QVariant v;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 				v.setValue<QGraphicsItem *>(qgi);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+				qDebug()<<"Help code for QT 6 or later";
+#endif
 				qlwi -> setData(42, v);
 				m_parts_list -> addItem(qlwi);
 				qlwi -> setSelected(qgi -> isSelected());
--- a/sources/machine_info.cpp
+++ b/sources/machine_info.cpp
@@ -46,9 +46,9 @@ void Machine_info::send_info_to_debug()
 {
 	qInfo()<<"debugging enabled:"
 		<< QLibraryInfo::isDebugBuild();
-
 	qInfo()<< "Qt library version:"
 		<< QLibraryInfo::version();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	qInfo()<< "Qt library location default prefix:"
 		<< QLibraryInfo::location(QLibraryInfo::PrefixPath);
 	qInfo()<< "Qt library location documentation:"
@@ -80,6 +80,43 @@ void Machine_info::send_info_to_debug()
 #ifndef Q_OS_WIN
 	qInfo()<< "Qt library location Qt settings:"
 		<< QLibraryInfo::location(QLibraryInfo::SettingsPath);
+#endif
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qInfo()<< "Qt library path default prefix:"
+		<< QLibraryInfo::path(QLibraryInfo::PrefixPath);
+	qInfo()<< "Qt library path documentation:"
+		<< QLibraryInfo::path(QLibraryInfo::DocumentationPath);
+	qInfo()<< "Qt library path headers:"
+		<< QLibraryInfo::path(QLibraryInfo::HeadersPath);
+	qInfo()<< "Qt library path libraries:"
+		<< QLibraryInfo::path(QLibraryInfo::LibrariesPath);
+	qInfo()<< "Qt library path executables:"
+		<< QLibraryInfo::path(QLibraryInfo::LibraryExecutablesPath);
+	qInfo()<< "Qt library path Qt binaries:"
+		<< QLibraryInfo::path(QLibraryInfo::BinariesPath);
+	qInfo()<< "Qt library path Qt plugins:"
+		<< QLibraryInfo::path(QLibraryInfo::PluginsPath);
+//	qInfo()<< "Qt library path installed QML extensions:"
+//		<< QLibraryInfo::path(QLibraryInfo::ImportsPath);
+	qInfo()<< "Qt library path installed QML extensions:"
+		<< QLibraryInfo::path(QLibraryInfo::Qml2ImportsPath);
+	qInfo()<< "Qt library path dependent Qt data:"
+		<< QLibraryInfo::path(QLibraryInfo::ArchDataPath);
+	qInfo()<< "Qt library path independent Qt data:"
+		<< QLibraryInfo::path(QLibraryInfo::DataPath);
+	qInfo()<< "Qt library path translation:"
+		<< QLibraryInfo::path(QLibraryInfo::TranslationsPath);
+	qInfo()<< "Qt library path examples:"
+		<< QLibraryInfo::path(QLibraryInfo::ExamplesPath);
+	qInfo()<< "Qt library path Qt testcases:"
+		<< QLibraryInfo::path(QLibraryInfo::TestsPath);
+#ifndef Q_OS_WIN
+	qInfo()<< "Qt library path Qt settings:"
+		<< QLibraryInfo::path(QLibraryInfo::SettingsPath);
+#endif
 #endif
 	qInfo()<< "GitRevision " + QString(GIT_COMMIT_SHA);
 	qInfo()<< "QElectroTech V " + QET::displayedVersion;
@@ -224,11 +261,11 @@ void Machine_info::init_get_cpu_info_winnt()

 	QProcess wingpuraminfo;
 	wingpuraminfo.start("wmic",
-			    QStringList()
-			    << "PATH"
-			    << "Win32_videocontroller"
-			    << "get"
-			    << "AdapterRAM ");
+				QStringList()
+				<< "PATH"
+				<< "Win32_videocontroller"
+				<< "get"
+				<< "AdapterRAM ");
 	wingpuraminfo.waitForFinished();
 	QString WinGPURAMOutput = wingpuraminfo.readAllStandardOutput();
 	pc.gpu.RAM=QString("RAM Total : %1 B").arg(
--- a/sources/main.cpp
+++ b/sources/main.cpp
@@ -30,8 +30,8 @@
 	@param msg : Message
 */
 void myMessageOutput(QtMsgType type,
-		     const QMessageLogContext &context,
-		     const QString &msg)
+			 const QMessageLogContext &context,
+			 const QString &msg)
 {

 	QString txt=QTime::currentTime().toString("hh:mm:ss.zzz");
@@ -110,8 +110,8 @@ void myMessageOutput(QtMsgType type,
 		txt+=")\n";
 	}
 	QFile outFile(QETApp::configDir()
-		      +QDate::currentDate().toString("yyyyMMdd")
-		      +".log");
+			  +QDate::currentDate().toString("yyyyMMdd")
+			  +".log");
 	if(outFile.open(QIODevice::WriteOnly | QIODevice::Append))
 	{
 		QTextStream ts(&outFile);
@@ -166,7 +166,13 @@ int main(int argc, char **argv)
 	QCoreApplication::setApplicationName("QElectroTech");
 	//Creation and execution of the application
 	//HighDPI
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+#endif
 	SingleApplication app(argc, argv, true);
 #ifdef Q_OS_MACOS
 	//Handle the opening of QET when user double click on a .qet .elmt .tbt file
--- a/sources/print/projectprintwindow.cpp
+++ b/sources/print/projectprintwindow.cpp
@@ -23,7 +23,13 @@
 #include "qeticons.h"

 #include <QPrintPreviewWidget>
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 #include <QDesktopWidget>
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+#endif
 #include <QScreen>
 #include <QPainter>
 #include <QPageSetupDialog>
@@ -45,7 +51,14 @@ void ProjectPrintWindow::launchDialog(QETProject *project, QWidget *parent)
 	}

 	auto printer_ = new QPrinter();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	printer_->setOrientation(QPrinter::Landscape);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qDebug()<<"Help code for QT 6 or later";
+#endif
 	printer_->setDocName(doc_name);
 	printer_->setOutputFileName(file_name);
 	printer_->setCreator(QString("QElectroTech %1").arg(QET::displayedVersion));
@@ -55,7 +68,14 @@ void ProjectPrintWindow::launchDialog(QETProject *project, QWidget *parent)
 print_dialog.setWindowFlags(Qt::Sheet);
 #endif
 	print_dialog.setWindowTitle(tr("Options d'impression", "window title"));
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	print_dialog.setEnabledOptions(QAbstractPrintDialog::PrintToFile | QAbstractPrintDialog::PrintShowPageSize);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qDebug()<<"Help code for QT 6 or later";
+#endif
 	if (print_dialog.exec() == QDialog::Rejected) {
 		delete  printer_;
 		return;
@@ -95,7 +115,7 @@ QString ProjectPrintWindow::docName(QETProject *project)
 * @param parent
 */
 ProjectPrintWindow::ProjectPrintWindow(QETProject *project, QPrinter *printer, QWidget *parent) :
-    QMainWindow(parent),
+	QMainWindow(parent),
 	ui(new Ui::ProjectPrintWindow),
 	m_project(project),
 	m_printer(printer)
@@ -213,8 +233,15 @@ void ProjectPrintWindow::printDiagram(Diagram *diagram, bool fit_page, QPainter
 		diagram->render(painter, QRectF(), diagram_rect, Qt::KeepAspectRatio);
 	} else {
 			//Print on one or several pages
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 		auto printed_rect = full_page ? printer->paperRect() : printer->pageRect();
-
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qDebug()<<"Help code for QT 6 or later";
+	auto printed_rect = full_page ? printer->paperRect(QPrinter::Millimeter) : printer->pageRect(QPrinter::Millimeter);
+#endif
 		auto used_width  = printed_rect.width();
 		auto used_height = printed_rect.height();
 		auto h_pages_count = horizontalPagesCount(diagram, option, full_page);
@@ -231,9 +258,16 @@ void ProjectPrintWindow::printDiagram(Diagram *diagram, bool fit_page, QPainter
 			auto x_offset = 0;
 			for (auto j=0 ; j<h_pages_count ; ++j)
 			{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 				page_grid.last() << QRect(QPoint(x_offset, y_offset),
 										  QSize(qMin(used_width, diagram_rect.width() - x_offset),
 												qMin(used_height, diagram_rect.height() - y_offset)));
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+				qDebug()<<"Help code for QT 6 or later";
+#endif
 				x_offset += used_width;
 			}
 			y_offset += used_height;
@@ -294,9 +328,18 @@ QRect ProjectPrintWindow::diagramRect(Diagram *diagram, const ExportProperties &
 * @return The width of the "poster" in number of page for print the diagram
 * with the orientation and the paper format used by the actual printer
 */
-int ProjectPrintWindow::horizontalPagesCount(Diagram *diagram, const ExportProperties &option, bool full_page) const
+int ProjectPrintWindow::horizontalPagesCount(
+		Diagram *diagram, const ExportProperties &option, bool full_page) const
 {
-	QRect printable_area = full_page ? m_printer-> paperRect() : m_printer-> pageRect();
+	QRect printable_area;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	printable_area = full_page ? m_printer-> paperRect() : m_printer-> pageRect();
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+				qDebug()<<"Help code for QT 6 or later";
+#endif
 	QRect diagram_rect = diagramRect(diagram, option);

 	int h_pages_count = int(ceil(qreal(diagram_rect.width()) / qreal(printable_area.width())));
@@ -311,9 +354,18 @@ int ProjectPrintWindow::horizontalPagesCount(Diagram *diagram, const ExportPrope
 * @return The height of the "poster" in number of pages for print the diagram
 * with the orientation and paper format used by the actual printer
 */
-int ProjectPrintWindow::verticalPagesCount(Diagram *diagram, const ExportProperties &option, bool full_page) const
+int ProjectPrintWindow::verticalPagesCount(
+		Diagram *diagram, const ExportProperties &option, bool full_page) const
 {
-	QRect printable_area = full_page ? m_printer->paperRect() : m_printer->pageRect();
+	QRect printable_area;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	printable_area = full_page ? m_printer->paperRect() : m_printer->pageRect();
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+				qDebug()<<"Help code for QT 6 or later";
+#endif
 	QRect diagram_rect = diagramRect(diagram, option);

 	int v_pages_count = int(ceil(qreal(diagram_rect.height()) / qreal(printable_area.height())));
@@ -371,6 +423,7 @@ QString ProjectPrintWindow::settingsSectionName(const QPrinter *printer)

 void ProjectPrintWindow::loadPageSetupForCurrentPrinter()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	QSettings settings;
 	QString printer_section = settingsSectionName(m_printer);

@@ -413,10 +466,17 @@ void ProjectPrintWindow::loadPageSetupForCurrentPrinter()

 	settings.endGroup();
 	settings.endGroup();
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qDebug()<<"Help code for QT 6 or later";
+#endif
 }

 void ProjectPrintWindow::savePageSetupForCurrentPrinter()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	QSettings settings;
 	QString printer_section = settingsSectionName(m_printer);

@@ -444,6 +504,12 @@ void ProjectPrintWindow::savePageSetupForCurrentPrinter()
 	settings.endGroup();
 	settings.endGroup();
 	settings.sync();
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qDebug()<<"Help code for QT 6 or later";
+#endif
 }

 /**
--- a/sources/qet.cpp
+++ b/sources/qet.cpp
@@ -25,6 +25,7 @@
 #include <QSaveFile>
 #include <QTextStream>
 #include <QRegularExpression>
+#include <QActionGroup>

 /**
 	Permet de convertir une chaine de caracteres ("n", "s", "e" ou "w")
@@ -164,9 +165,9 @@ bool QET::lineContainsPoint(const QLineF &line, const QPointF &point) {
 	@return true si le projete orthogonal du point sur la droite appartient au
 	segment de droite.
 */
-bool QET::orthogonalProjection(const QPointF &point,
-			       const QLineF &line,
-			       QPointF *intersection) {
+bool QET::orthogonalProjection(
+		const QPointF &point,const QLineF &line,QPointF *intersection)
+{
 	// recupere le vecteur normal de `line'
 	QLineF line_normal_vector(line.normalVector());
 	QPointF normal_vector(line_normal_vector.dx(), line_normal_vector.dy());
@@ -210,9 +211,9 @@ bool QET::orthogonalProjection(const QPointF &point,
 	@param entier Pointeur facultatif vers un entier
 	@return true si l'attribut est bien un entier, false sinon
 */
-bool QET::attributeIsAnInteger(const QDomElement &e,
-			       const QString& nom_attribut,
-			       int *entier) {
+bool QET::attributeIsAnInteger(
+		const QDomElement &e,const QString& nom_attribut,int *entier)
+{
 	// verifie la presence de l'attribut
 	if (!e.hasAttribute(nom_attribut)) return(false);
 	// verifie la validite de l'attribut
@@ -231,9 +232,9 @@ bool QET::attributeIsAnInteger(const QDomElement &e,
 	@param reel Pointeur facultatif vers un double
 	@return true si l'attribut est bien un reel, false sinon
 */
-bool QET::attributeIsAReal(const QDomElement &e,
-			   const QString& nom_attribut,
-			   qreal *reel) {
+bool QET::attributeIsAReal(
+		const QDomElement &e,const QString& nom_attribut,qreal *reel)
+{
 	// verifie la presence de l'attribut
 	if (!e.hasAttribute(nom_attribut)) return(false);
 	// verifie la validite de l'attribut
@@ -258,13 +259,14 @@ bool QET::attributeIsAReal(const QDomElement &e,
 	@return la proposition decrivant le nombre d'elements, de conducteurs et de
 	textes
 */
-QString QET::ElementsAndConductorsSentence(int elements_count,
-					   int conductors_count,
-					   int texts_count,
-					   int images_count,
-					   int shapes_count,
-					   int element_text_count,
-					   int tables_count)
+QString QET::ElementsAndConductorsSentence(
+		int elements_count,
+		int conductors_count,
+		int texts_count,
+		int images_count,
+		int shapes_count,
+		int element_text_count,
+		int tables_count)
 {
 	QString text;
 	if (elements_count) {
@@ -333,9 +335,14 @@ QString QET::ElementsAndConductorsSentence(int elements_count,
 /**
 	@return the list of \a tag_name elements directly under the \a e XML element.
 */
-QList<QDomElement> QET::findInDomElement(const QDomElement &e, const QString &tag_name) {
+QList<QDomElement> QET::findInDomElement(
+		const QDomElement &e, const QString &tag_name)
+{
 	QList<QDomElement> return_list;
-	for (QDomNode node = e.firstChild() ; !node.isNull() ; node = node.nextSibling()) {
+	for (QDomNode node = e.firstChild() ;
+		 !node.isNull() ;
+		 node = node.nextSibling())
+	{
 		if (!node.isElement()) continue;
 		QDomElement element = node.toElement();
 		if (element.isNull() || element.tagName() != tag_name) continue;
@@ -352,18 +359,24 @@ QList<QDomElement> QET::findInDomElement(const QDomElement &e, const QString &ta
 	@param children tag XML a rechercher
 	@return La liste des elements XML children
 */
-QList<QDomElement> QET::findInDomElement(const QDomElement &e,
-					 const QString &parent,
-					 const QString &children) {
+QList<QDomElement> QET::findInDomElement(
+		const QDomElement &e,const QString &parent,const QString &children)
+{
 	QList<QDomElement> return_list;

 	// parcours des elements parents
-	for (QDomNode enfant = e.firstChild() ; !enfant.isNull() ; enfant = enfant.nextSibling()) {
+	for (QDomNode enfant = e.firstChild() ;
+		 !enfant.isNull() ;
+		 enfant = enfant.nextSibling())
+	{
 		// on s'interesse a l'element XML "parent"
 		QDomElement parents = enfant.toElement();
 		if (parents.isNull() || parents.tagName() != parent) continue;
 		// parcours des enfants de l'element XML "parent"
-		for (QDomNode node_children = parents.firstChild() ; !node_children.isNull() ; node_children = node_children.nextSibling()) {
+		for (QDomNode node_children = parents.firstChild() ;
+			 !node_children.isNull() ;
+			 node_children = node_children.nextSibling())
+		{
 			// on s'interesse a l'element XML "children"
 			QDomElement n_children = node_children.toElement();
 			if (!n_children.isNull() && n_children.tagName() == children) return_list.append(n_children);
@@ -404,8 +417,8 @@ QString QET::license()
 */
 QList<QChar> QET::forbiddenCharacters()
 {
-	return(QList<QChar>() << '\\' << '/' << ':' << '*' << '?' << '"'
-	       << '<' << '>' << '|');
+	return(QList<QChar>()
+		   << '\\' << '/' << ':' << '*' << '?' << '"'<< '<' << '>' << '|');
 }

 /**
@@ -614,7 +627,14 @@ bool QET::writeXmlFile(QDomDocument &xml_doc, const QString &filepath, QString *
 	}

 	QTextStream out(&file);
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	out.setCodec("UTF-8");
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	out.setEncoding(QStringConverter::Utf8);
+#endif
 	out.setGenerateByteOrderMark(false);
 	out << xml_doc.toString(4);
 	if  (!file.commit())
@@ -741,7 +761,14 @@ bool QET::writeToFile(QDomDocument &xml_doc, QFile *file, QString *error_message

 	QTextStream out(file);
 	out.seek(0);
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	out.setCodec("UTF-8");
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	out.setEncoding(QStringConverter::Utf8);
+#endif
 	out.setGenerateByteOrderMark(false);
 	out << xml_doc.toString(4);
 	if (opened_here) {
--- a/sources/qetapp.cpp
+++ b/sources/qetapp.cpp
@@ -105,12 +105,12 @@ QETApp::QETApp() :
 	if (qet_arguments_.files().isEmpty())
 	{
 		setSplashScreenStep(tr("Chargement... Éditeur de schéma",
-				       "splash screen caption"));
+					   "splash screen caption"));
 		new QETDiagramEditor();
 	} else
 	{
 		setSplashScreenStep(tr("Chargement... Ouverture des fichiers",
-				       "splash screen caption"));
+					   "splash screen caption"));
 		openFiles(qet_arguments_);
 	}

@@ -167,7 +167,14 @@ void QETApp::setLanguage(const QString &desired_language) {
 	QString languages_path = languagesPath();

 	// load Qt library translations
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	QString qt_l10n_path = QLibraryInfo::location(QLibraryInfo::TranslationsPath);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	QString qt_l10n_path = QLibraryInfo::path(QLibraryInfo::TranslationsPath);
+#endif
 	if (!qtTranslator.load("qt_" + desired_language, qt_l10n_path)) {
 		qtTranslator.load("qt_" + desired_language, languages_path);
 	}
@@ -549,7 +556,7 @@ TitleBlockTemplatesFilesCollection *QETApp::customTitleBlockTemplatesCollection(
 				new TitleBlockTemplatesFilesCollection(
 					QETApp::customTitleBlockTemplatesDir());
 		m_custom_tbt_collection -> setTitle(tr("Cartouches utilisateur",
-						       "title of the user's \
+							   "title of the user's \
 					title block templates collection"));
 		m_custom_tbt_collection -> setProtocol(QETAPP_CUSTOM_TBT_PROTOCOL);
 		m_custom_tbt_collection -> setCollection(QET::QetCollection::Custom);
@@ -651,7 +658,7 @@ QString QETApp::commonElementsDir()
 		 *  relatif au dossier contenant le binaire executable
 		 */
 		return(QCoreApplication::applicationDirPath()
-		       + "/" + QUOTE(QET_COMMON_COLLECTION_PATH));
+			   + "/" + QUOTE(QET_COMMON_COLLECTION_PATH));
 	#endif
 #endif
 }
@@ -752,7 +759,7 @@ QString QETApp::commonTitleBlockTemplatesDir()
 		 * to the directory that contains the executable binary
 		 */
 		return(QCoreApplication::applicationDirPath()
-		       + "/" + QUOTE(QET_COMMON_TBT_PATH));
+			   + "/" + QUOTE(QET_COMMON_TBT_PATH));
 	#endif
 #endif
 }
@@ -860,7 +867,7 @@ QString QETApp::realPath(const QString &sym_path) {
 		directory = customTitleBlockTemplatesDir();
 	} else return(QString());
 	return(directory
-	       + QDir::toNativeSeparators(sym_path.right(sym_path.length() - 9)));
+		   + QDir::toNativeSeparators(sym_path.right(sym_path.length() - 9)));
 }


@@ -1081,7 +1088,7 @@ QString QETApp::languagesPath()
 		 *  au dossier contenant le binaire executable
 		 */
 		return(QCoreApplication::applicationDirPath()
-		       + "/" + QUOTE(QET_LANG_PATH));
+			   + "/" + QUOTE(QET_LANG_PATH));
 	#endif
 #endif
 	}
@@ -1126,9 +1133,9 @@ QFont QETApp::diagramTextsFont(qreal size)

 	//Font to use
 	QString diagram_texts_family = settings.value("diagramfont",
-						      "Sans Serif").toString();
+							  "Sans Serif").toString();
 	qreal diagram_texts_size     = settings.value("diagramsize",
-						      9.0).toDouble();
+							  9.0).toDouble();

 	if (size != -1.0) {
 		diagram_texts_size = size;
@@ -1155,8 +1162,9 @@ QFont QETApp::diagramTextsItemFont(qreal size)
 							   "Sans Serif").toString();
 	qreal diagram_texts_item_size     = settings.value("diagramitemsize",
 							   9.0).toDouble();
-	qreal diagram_texts_item_weight   = settings.value("diagramitemweight"
-							   ).toDouble();
+	auto diagram_texts_item_weight =
+			static_cast<QFont::Weight>(
+				settings.value("diagramitemweight").toInt());
 	QString diagram_texts_item_style  = settings.value("diagramitemstyle",
 							   "normal").toString();

@@ -1290,15 +1298,15 @@ QTextOrientationSpinBoxWidget *QETApp::createTextOrientationSpinBoxWidget()
 	widget -> orientationWidget() -> setFont(QETApp::diagramTextsFont());
 	widget -> orientationWidget() -> setUsableTexts(QList<QString>()
 		<< QETApp::tr("Q",
-			      "Single-letter example text - translate length, not meaning")
+				  "Single-letter example text - translate length, not meaning")
 		<< QETApp::tr("QET",
-			      "Small example text - translate length, not meaning")
+				  "Small example text - translate length, not meaning")
 		<< QETApp::tr("Schema",
-			      "Normal example text - translate length, not meaning")
+				  "Normal example text - translate length, not meaning")
 		<< QETApp::tr("Electrique",
-			      "Normal example text - translate length, not meaning")
+				  "Normal example text - translate length, not meaning")
 		<< QETApp::tr("QElectroTech",
-			      "Long example text - translate length, not meaning")
+				  "Long example text - translate length, not meaning")
 	);
 	return(widget);
 }
@@ -1699,7 +1707,7 @@ void QETApp::openElementLocations(const QList<ElementsLocation> &locations_list)
 	@see QETTitleBlockTemplateEditor::setOpenForDuplication()
 */
 void QETApp::openTitleBlockTemplate(const TitleBlockTemplateLocation &location,
-				    bool duplicate) {
+					bool duplicate) {
 	QETTitleBlockTemplateEditor *qet_template_editor = new QETTitleBlockTemplateEditor();
 	qet_template_editor -> setOpenForDuplication(duplicate);
 	qet_template_editor -> edit(location);
@@ -1822,7 +1830,7 @@ QList<QWidget *> QETApp::floatingToolbarsAndDocksForMainWindow(
 	foreach(QWidget *qw, qApp->topLevelWidgets()) {
 		if (!qw -> isWindow()) continue;
 		if (qobject_cast<QToolBar *>(qw)
-		    || qobject_cast<QDockWidget *>(qw)) {
+			|| qobject_cast<QDockWidget *>(qw)) {
 			if (qw -> parent() == window) widgets << qw;
 		}
 	}
@@ -1935,7 +1943,7 @@ void QETApp::setSplashScreenStep(const QString &message) {
 	if (!m_splash_screen) return;
 	if (!message.isEmpty()) {
 		m_splash_screen -> showMessage(message,
-					       Qt::AlignBottom | Qt::AlignLeft);
+						   Qt::AlignBottom | Qt::AlignLeft);
 	}
 	qApp->processEvents();
 }
@@ -2016,7 +2024,7 @@ void QETApp::initConfiguration()
 void QETApp::initSystemTray()
 {
 	setSplashScreenStep(tr("Chargement... icône du systray",
-			       "splash screen caption"));
+				   "splash screen caption"));
 	// initialization of the icon menus in the systray
 	// initialisation des menus de l'icone dans le systray
 	menu_systray = new QMenu(tr("QElectroTech", "systray menu title"));
@@ -2118,7 +2126,7 @@ int QETApp::projectIdFromString(const QString &url) {
 	if (!match.hasMatch())
 	{
 		qDebug()<<"no Match => return"
-		       <<url;
+			   <<url;
 		return(-1);
 	}
 	bool conv_ok = false;
@@ -2240,8 +2248,8 @@ void QETApp::checkBackupFiles()
 		text.append(tr("<b>Les fichiers de restauration suivant on été trouvé,<br>"
 					   "Voulez-vous les ouvrir ?</b><br>"));
 	}
-    for(const KAutoSaveFile *kasf : stale_files)
-    {
+	for(const KAutoSaveFile *kasf : stale_files)
+	{
 #ifdef Q_OS_WIN
 	//Remove the first character '/' before the name of the drive
 	text.append("<br>" + kasf->managedFile().path().remove(0,1));
@@ -2329,19 +2337,19 @@ void QETApp::fetchWindowStats(

 #ifdef Q_OS_DARWIN
 /**
-    Gere les evenements, en particulier l'evenement FileOpen sous MacOs.
-    @param e Evenement a gerer
+	Gere les evenements, en particulier l'evenement FileOpen sous MacOs.
+	@param e Evenement a gerer
 */
 bool QETApp::eventFiltrer(QObject *object, QEvent *e) {
-    // gere l'ouverture de fichiers (sous MacOs)
-    if (e -> type() == QEvent::FileOpen) {
+	// gere l'ouverture de fichiers (sous MacOs)
+	if (e -> type() == QEvent::FileOpen) {
 	// nom du fichier a ouvrir
 	QString filename = static_cast<QFileOpenEvent *>(e) -> file();
 	openFiles(QStringList() << filename);
 	return(true);
-    } else {
+	} else {
 	return QObject::eventFilter(object, e);
-    }
+	}
 }
 #endif

--- a/sources/qetgraphicsitem/ViewItem/qetgraphicstableitem.cpp
+++ b/sources/qetgraphicsitem/ViewItem/qetgraphicstableitem.cpp
@@ -657,7 +657,7 @@ bool QetGraphicsTableItem::toDXF(const QString &filepath)
 	//QRectF rect = boundingRect();
 	QRectF rect(0,0, m_header_item->rect().width(), m_current_size.height());
 	QPolygonF poly(rect);
-    Createdxf::drawPolygon(filepath,mapToScene(poly),0);
+	Createdxf::drawPolygon(filepath,mapToScene(poly),0);

 	//Draw vertical lines
 	auto offset= 0;
@@ -970,6 +970,7 @@ void QetGraphicsTableItem::adjustColumnsWidth()
 	int sum_=0;
 	for(auto i= 0 ; i<m_model->columnCount() ; ++i)
 	{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 		auto at_a = std::min(m_minimum_column_width.size()-1, i);               //In case of the I is higher than m_minimum_column_width or
 		auto at_b = std::min(m_header_item->minimumSectionWidth().size()-1, i); //m_header_item->minimumSectionWidth().size()
 		m_header_item->resizeSection(
@@ -978,6 +979,12 @@ void QetGraphicsTableItem::adjustColumnsWidth()
 						m_minimum_column_width.at(at_a),
 						m_header_item->minimumSectionWidth().at(at_b))+b);
 		sum_+= m_header_item->sectionSize(i);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+		qDebug()<<"Help code for QT 6 or later";
+#endif
 	}


--- a/sources/qetgraphicsitem/conductor.cpp
+++ b/sources/qetgraphicsitem/conductor.cpp
@@ -470,15 +470,15 @@ QPointF Conductor::extendTerminal(const QPointF &terminal, Qet::Orientation term

 /**
 	Dessine le conducteur sans antialiasing.
-	@param qp Le QPainter a utiliser pour dessiner le conducteur
+	@param painter Le QPainter a utiliser pour dessiner le conducteur
 	@param options Les options de style pour le conducteur
 	@param qw Le QWidget sur lequel on dessine
 */
-void Conductor::paint(QPainter *qp, const QStyleOptionGraphicsItem *options, QWidget *qw)
+void Conductor::paint(QPainter *painter, const QStyleOptionGraphicsItem *options, QWidget *qw)
 {
 	Q_UNUSED(qw);
-	qp -> save();
-	qp -> setRenderHint(QPainter::Antialiasing, false);
+	painter -> save();
+	painter -> setRenderHint(QPainter::Antialiasing, false);

 		// Set the color of conductor
 	QColor final_conductor_color(m_properties.color);
@@ -500,7 +500,7 @@ void Conductor::paint(QPainter *qp, const QStyleOptionGraphicsItem *options, QWi
 	conductor_pen.setWidthF(m_mouse_over? (m_properties.cond_size) +4 : (m_properties.cond_size));

 		//Set the QPen and QBrush to the QPainter
-	qp -> setBrush(conductor_brush);
+	painter -> setBrush(conductor_brush);
 	QPen final_conductor_pen = conductor_pen;

 		//Set the conductor style
@@ -509,14 +509,22 @@ void Conductor::paint(QPainter *qp, const QStyleOptionGraphicsItem *options, QWi
 	final_conductor_pen.setJoinStyle(Qt::SvgMiterJoin); // better rendering with dot

 		//Use a cosmetique line, below a certain zoom
-	if (options && options -> levelOfDetail < 1.0) {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (options && options -> levelOfDetail < 1.0)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (options && options->levelOfDetailFromTransform(painter->worldTransform()) < 1.0)
+#endif
+	{
 		final_conductor_pen.setCosmetic(true);
 	}

-	qp -> setPen(final_conductor_pen);
+	painter -> setPen(final_conductor_pen);

 		//Draw the conductor
-	qp -> drawPath(path());
+	painter -> drawPath(path());
 		//Draw the second color
 	if(m_properties.m_bicolor)
 	{
@@ -525,20 +533,20 @@ void Conductor::paint(QPainter *qp, const QStyleOptionGraphicsItem *options, QWi
 		QVector<qreal> dash_pattern;
 		dash_pattern << m_properties.m_dash_size-2 << m_properties.m_dash_size;
 		final_conductor_pen.setDashPattern(dash_pattern);
-		qp->save();
-		qp->setPen(final_conductor_pen);
-		qp->drawPath(path());
-		qp->restore();
+		painter->save();
+		painter->setPen(final_conductor_pen);
+		painter->drawPath(path());
+		painter->restore();
 	}

 	if (m_properties.type == ConductorProperties::Single) {
-		qp -> setBrush(final_conductor_color);
+		painter -> setBrush(final_conductor_color);
 		m_properties.singleLineProperties.draw(
-			qp,
+			painter,
 			middleSegment() -> isHorizontal() ? QET::Horizontal : QET::Vertical,
 			QRectF(middleSegment() -> middle() - QPointF(12.0, 12.0), QSizeF(24.0, 24.0))
 		);
-		if (isSelected()) qp -> setBrush(Qt::NoBrush);
+		if (isSelected()) painter -> setBrush(Qt::NoBrush);
 	}

 		//Draw the junctions
@@ -546,15 +554,15 @@ void Conductor::paint(QPainter *qp, const QStyleOptionGraphicsItem *options, QWi
 	if (!junctions_list.isEmpty()) {
 		final_conductor_pen.setStyle(Qt::SolidLine);
 		QBrush junction_brush(final_conductor_color, Qt::SolidPattern);
-		qp -> setPen(final_conductor_pen);
-		qp -> setBrush(junction_brush);
-		qp -> setRenderHint(QPainter::Antialiasing, true);
+		painter -> setPen(final_conductor_pen);
+		painter -> setBrush(junction_brush);
+		painter -> setRenderHint(QPainter::Antialiasing, true);
 		foreach(QPointF point, junctions_list) {
-			qp -> drawEllipse(QRectF(point.x() - 1.5, point.y() - 1.5, 3.0, 3.0));
+			painter -> drawEllipse(QRectF(point.x() - 1.5, point.y() - 1.5, 3.0, 3.0));
 		}
 	}

-	qp -> restore();
+	painter -> restore();
 }

 /// @return le Diagram auquel ce conducteur appartient, ou 0 si ce conducteur est independant
@@ -1014,8 +1022,8 @@ bool Conductor::fromXml(QDomElement &dom_element)
 	@return Un element XML representant le conducteur
 */
 QDomElement Conductor::toXml(QDomDocument &dom_document,
-			     QHash<Terminal *,
-			     int> &table_adr_id) const
+				 QHash<Terminal *,
+				 int> &table_adr_id) const
 {
 	QDomElement dom_element = dom_document.createElement("conductor");

@@ -1514,7 +1522,7 @@ QPainterPath Conductor::path() const
 	the other values of property stay unmodified
 */
 void Conductor::setPropertyToPotential(const ConductorProperties &property,
-				       bool only_text)
+					   bool only_text)
 {
 	setProperties(property);
 	QSet <Conductor *> potential_list = relatedPotentialConductors();
--- a/sources/qetgraphicsitem/element.cpp
+++ b/sources/qetgraphicsitem/element.cpp
@@ -33,6 +33,7 @@
 #include "elementtextitemgroup.h"
 #include "elementpicturefactory.h"
 #include "iostream"
+#include <QDomElement>

 class ElementXmlRetroCompatibility
 {
@@ -45,11 +46,11 @@ class ElementXmlRetroCompatibility
 	{
 		int i = 0;
 		while (!dom_element.attribute(seq +
-					      QString::number(i+1)).isEmpty())
+						  QString::number(i+1)).isEmpty())
 		{
 				list->append(dom_element.attribute(
-						     seq +
-						     QString::number(i+1)));
+							 seq +
+							 QString::number(i+1)));
 				i++;
 		}
 	}
@@ -210,7 +211,15 @@ void Element::paint(
 		drawHighlight(painter, options);
 	}

-	if (options && options -> levelOfDetail < 1.0) {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (options && options -> levelOfDetail < 1.0)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (options && options->levelOfDetailFromTransform(painter->worldTransform()) < 1.0)
+#endif
+	{
 		painter->drawPicture(0, 0, m_low_zoom_picture);
 	} else {
 		painter->drawPicture(0, 0, m_picture);
@@ -228,7 +237,7 @@ void Element::paint(
 QRectF Element::boundingRect() const
 {
 	return(QRectF(QPointF(-hotspot_coord.x(), -hotspot_coord.y()),
-		      dimensions));
+			  dimensions));
 }

 /**
@@ -357,7 +366,7 @@ void Element::drawHighlight(
 	painter -> save();

 	qreal gradient_radius = qMin(boundingRect().width(),
-				     boundingRect().height()) / 2.0;
+					 boundingRect().height()) / 2.0;
 	QRadialGradient gradient(
 		boundingRect().center(),
 		gradient_radius,
@@ -457,8 +466,8 @@ bool Element::buildFromXml(const QDomElement &xml_def_elmt, int *state)
 		//scroll of the Children of the Definition: Parts of the Drawing
 	int parsed_elements_count = 0;
 	for (QDomNode node = xml_def_elmt.firstChild() ;
-	     !node.isNull() ;
-	     node = node.nextSibling())
+		 !node.isNull() ;
+		 node = node.nextSibling())
 	{
 		QDomElement elmts = node.toElement();
 		if (elmts.isNull())
@@ -471,8 +480,8 @@ bool Element::buildFromXml(const QDomElement &xml_def_elmt, int *state)
 			QList <QDomElement> input_field;
 			bool have_label = false;
 			for (QDomElement input_node = node.firstChildElement("input") ;
-			     !input_node.isNull() ;
-			     input_node = input_node.nextSiblingElement("input"))
+				 !input_node.isNull() ;
+				 input_node = input_node.nextSiblingElement("input"))
 			{
 				if (!input_node.isNull())
 				{
@@ -488,8 +497,8 @@ bool Element::buildFromXml(const QDomElement &xml_def_elmt, int *state)

 				//Parse the definition
 			for (QDomNode n = node.firstChild() ;
-			     !n.isNull() ;
-			     n = n.nextSibling())
+				 !n.isNull() ;
+				 n = n.nextSibling())
 			{
 				QDomElement qde = n.toElement();
 				if (qde.isNull())
@@ -588,7 +597,7 @@ bool Element::parseInput(const QDomElement &dom_element)
 		QTransform transform;
 			//First make the rotation
 		transform.rotate(dom_element.attribute("rotation",
-						       "0").toDouble());
+							   "0").toDouble());
 		QPointF pos = transform.map(
 					QPointF(0,
 						-deti->boundingRect().height()/2));
@@ -753,17 +762,23 @@ bool Element::fromXml(
 		// copie des associations id / adr
 		foreach(int id_trouve, priv_id_adr.keys()) {
 			table_id_adr.insert(id_trouve,
-					    priv_id_adr.value(id_trouve));
+						priv_id_adr.value(id_trouve));
 		}
 	}

 	//load uuid of connected elements
 	QList <QDomElement> uuid_list = QET::findInDomElement(e,
-							      "links_uuids",
-							      "link_uuid");
+								  "links_uuids",
+								  "link_uuid");
 	foreach (QDomElement qdo, uuid_list)
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 		tmp_uuids_link << qdo.attribute("uuid");
-
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+		qDebug()<<"Help code for QT 6 or later";
+#endif
 	//uuid of this element
 	m_uuid= QUuid(e.attribute("uuid", QUuid::createUuid().toString()));

@@ -810,9 +825,9 @@ bool Element::fromXml(
 		//***Dynamic texts item***//
 		//************************//
 	for (const QDomElement& qde : QET::findInDomElement(
-		     e,
-		     "dynamic_texts",
-		     DynamicElementTextItem::xmlTagName()))
+			 e,
+			 "dynamic_texts",
+			 DynamicElementTextItem::xmlTagName()))
 	{
 		DynamicElementTextItem *deti = new DynamicElementTextItem(this);
 		addDynamicTextItem(deti);
@@ -842,7 +857,7 @@ bool Element::fromXml(
 			if (qFuzzyCompare(qreal(dom_input.attribute("x").toDouble()),
 					  m_converted_text_from_xml_description.value(deti).x()) &&
 				qFuzzyCompare(qreal(dom_input.attribute("y").toDouble()),
-					      m_converted_text_from_xml_description.value(deti).y()))
+						  m_converted_text_from_xml_description.value(deti).y()))
 			{
 					//Once again this 'if', is only for retrocompatibility with old old old project
 					//when element text with tagg "label" is not null, but the element information "label" is.
@@ -913,9 +928,9 @@ bool Element::fromXml(
 	m_converted_text_from_xml_description.clear();

 	for (QDomElement qde : QET::findInDomElement(
-		     e,
-		     "texts_groups",
-		     ElementTextItemGroup::xmlTaggName()))
+			 e,
+			 "texts_groups",
+			 ElementTextItemGroup::xmlTaggName()))
 	{
 		ElementTextItemGroup *group =
 				addTextGroup("loaded_from_xml_group");
@@ -991,11 +1006,11 @@ bool Element::fromXml(
 		{
 			if(!label.isEmpty() && la &&
 			   ((!comment.isEmpty() && c)
-			    || (!location.isEmpty() && lo)))
+				|| (!location.isEmpty() && lo)))
 			{
 				//#2 in the converted list one text must have text from = element info and info name = label
 				for(DynamicElementTextItem *deti
-				    : successfully_converted)
+					: successfully_converted)
 				{
 					if(deti->textFrom()== DynamicElementTextItem::ElementInfo
 							&& deti->infoName() == "label")
@@ -1058,10 +1073,10 @@ bool Element::fromXml(
 						addTextToGroup(deti, group);
 						if(comment_text)
 							addTextToGroup(comment_text,
-								       group);
+									   group);
 						if(location_text)
 							addTextToGroup(location_text,
-								       group);
+									   group);
 						group->setAlignment(Qt::AlignVCenter);
 						group->setVerticalAdjustment(-4);
 						group->setRotation(rotation);
@@ -1354,7 +1369,7 @@ ElementTextItemGroup *Element::addTextGroup(const QString &name)
 	if(m_texts_group.isEmpty())
 	{
 		ElementTextItemGroup *group = new ElementTextItemGroup(name,
-								       this);
+									   this);
 		m_texts_group << group;
 		emit textsGroupAdded(group);
 		return group;
@@ -1454,7 +1469,7 @@ QList<ElementTextItemGroup *> Element::textGroups() const
 	@return : true if the text was succesfully added to the group.
 */
 bool Element::addTextToGroup(DynamicElementTextItem *text,
-			     ElementTextItemGroup *group)
+				 ElementTextItemGroup *group)
 {
 	if(!m_dynamic_text_list.contains(text))
 		return false;
@@ -1643,7 +1658,7 @@ void Element::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 */
 void Element::hoverEnterEvent(QGraphicsSceneHoverEvent *e)
 {
-    Q_UNUSED(e)
+	Q_UNUSED(e)

 	foreach (Element *elmt, linkedElements())
 		elmt -> setHighlighted(true);
@@ -1661,7 +1676,7 @@ void Element::hoverEnterEvent(QGraphicsSceneHoverEvent *e)
 */
 void Element::hoverLeaveEvent(QGraphicsSceneHoverEvent *e)
 {
-    Q_UNUSED(e)
+	Q_UNUSED(e)

 	foreach (Element *elmt, linkedElements())
 		elmt -> setHighlighted(false);
@@ -1703,10 +1718,10 @@ void Element::setUpFormula(bool code_letter)

 		m_autoNum_seq.clear();
 		autonum::setSequential(formula,
-				       m_autoNum_seq,
-				       nc,
-				       diagram(),
-				       element_currentAutoNum);
+					   m_autoNum_seq,
+					   nc,
+					   diagram(),
+					   element_currentAutoNum);
 		diagram()->project()->addElementAutoNum(element_currentAutoNum,
 							ncc.next());

--- a/sources/qetgraphicsitem/terminal.cpp
+++ b/sources/qetgraphicsitem/terminal.cpp
@@ -262,23 +262,30 @@ void Terminal::removeConductor(Conductor *conductor)
 /**
 	@brief Terminal::paint
 	Fonction de dessin des bornes
-	@param p Le QPainter a utiliser
+	@param painter Le QPainter a utiliser
 	@param options Les options de dessin
 */
 void Terminal::paint(
-		QPainter *p,
+		QPainter *painter,
 		const QStyleOptionGraphicsItem *options,
 		QWidget *)
 {
 	// en dessous d'un certain zoom, les bornes ne sont plus dessinees
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	if (options && options -> levelOfDetail < 0.5) return;
-
-	p -> save();
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (options && options->levelOfDetailFromTransform(painter->worldTransform()) < 0.5)
+		return;
+#endif
+	painter -> save();

 	//annulation des renderhints
-	p -> setRenderHint(QPainter::Antialiasing,          false);
-	p -> setRenderHint(QPainter::TextAntialiasing,      false);
-	p -> setRenderHint(QPainter::SmoothPixmapTransform, false);
+	painter -> setRenderHint(QPainter::Antialiasing,          false);
+	painter -> setRenderHint(QPainter::TextAntialiasing,      false);
+	painter -> setRenderHint(QPainter::SmoothPixmapTransform, false);

 	// on travaille avec les coordonnees de l'element parent
 	QPointF c = mapFromParent(d->m_pos);
@@ -287,23 +294,31 @@ void Terminal::paint(
 	QPen t;
 	t.setWidthF(1.0);

-	if (options && options -> levelOfDetail < 1.0) {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
+	if (options && options -> levelOfDetail < 1.0)
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	if (options && options->levelOfDetailFromTransform(painter->worldTransform()) < 1.0)
+#endif
+	{
 		t.setCosmetic(true);
 	}

 	// dessin de la borne en rouge
 	t.setColor(Qt::red);
-	p -> setPen(t);
-	p -> drawLine(c, e);
+	painter -> setPen(t);
+	painter -> drawLine(c, e);

 	// dessin du point d'amarrage au conducteur en bleu
 	t.setColor(hovered_color_);
-	p -> setPen(t);
-	p -> setBrush(hovered_color_);
+	painter -> setPen(t);
+	painter -> setBrush(hovered_color_);
 	if (hovered_) {
-		p -> setRenderHint(QPainter::Antialiasing, true);
-		p -> drawEllipse(QRectF(c.x() - 2.5, c.y() - 2.5, 5.0, 5.0));
-	} else p -> drawPoint(c);
+		painter -> setRenderHint(QPainter::Antialiasing, true);
+		painter -> drawEllipse(QRectF(c.x() - 2.5, c.y() - 2.5, 5.0, 5.0));
+	} else painter -> drawPoint(c);

 	//Draw help line if needed,
 	if (diagram() && m_draw_help_line)
@@ -365,7 +380,7 @@ void Terminal::paint(
 		m_help_line_a -> setLine(line);
 	}

-	p -> restore();
+	painter -> restore();
 }

 /**
--- a/sources/qetgraphicsitem/terminal.h
+++ b/sources/qetgraphicsitem/terminal.h
@@ -61,8 +61,10 @@ class Terminal : public QGraphicsObject
 		*/
 		int type() const override { return Type; }

-		void   paint        (QPainter *,const QStyleOptionGraphicsItem *,
-				     QWidget *) override;
+		void paint(
+				QPainter *painter,
+				const QStyleOptionGraphicsItem *,
+				QWidget *) override;
 		void   drawHelpLine (bool draw = true);
 		QLineF HelpLine     () const;
 		QRectF boundingRect () const override;
@@ -127,10 +129,10 @@ class Terminal : public QGraphicsObject

 		/// Parent electrical element
 		Element *parent_element_{nullptr};
-    public:
+	public:
 		/// docking point for parent element
 		QPointF dock_elmt_;
-    private:
+	private:
 		/// List of conductors attached to the terminal
 		QList<Conductor *> conductors_;
 		/**
@@ -185,6 +187,6 @@ inline QString Terminal::name() const
 }

 QList<Terminal *> relatedPotentialTerminal (const Terminal *terminal,
-					    const bool all_diagram = true);
+						const bool all_diagram = true);

 #endif
--- a/sources/qetproject.cpp
+++ b/sources/qetproject.cpp
@@ -16,11 +16,6 @@
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */

-#include <QTimer>
-#include <QStandardPaths>
-#include <utility>
-#include <QtConcurrent>
-#include <QHash>

 #include "qetproject.h"
 #include "diagram.h"
@@ -37,6 +32,13 @@
 #include "numerotationcontextcommands.h"
 #include "assignvariables.h"

+#include <QTimer>
+#include <QStandardPaths>
+#include <utility>
+#include <QtConcurrent>
+#include <QHash>
+#include <QtDebug>
+
 static int BACKUP_INTERVAL = 120000; //interval in ms of backup = 2min

 /**
@@ -178,7 +180,7 @@ QETProject::ProjectState QETProject::openFile(QFile *file)
 	bool opened_here = file->isOpen() ? false : true;
 	if (!file->isOpen()
 			&& !file->open(QIODevice::ReadOnly
-				       | QIODevice::Text)) {
+					   | QIODevice::Text)) {
 		return FileOpenFailed;
 	}
 	QFileInfo fi(*file);
@@ -887,7 +889,7 @@ QDomDocument QETProject::toXml()
 	for(Diagram *diagram : diagrams_list)
 	{
 		qDebug() << QString("exporting diagram \"%1\""
-				    ).arg(diagram -> title())
+					).arg(diagram -> title())
 			 << "["
 			 << diagram
 			 << "]";
@@ -1080,7 +1082,7 @@ ElementsLocation QETProject::importElement(ElementsLocation &location)
 	//Element doesn't exist in the collection, we just import it
 	else {
 		ElementsLocation loc(m_elements_collection->addElement(
-					     location), this);
+						 location), this);

 		if (!loc.exist()) {
 			qDebug() << "failed to import location. "
@@ -1370,8 +1372,8 @@ void QETProject::readDiagramsXml(QDomDocument &xml_project)

 			int diagram_order = -1;
 			if (!QET::attributeIsAnInteger(diagram_xml_element,
-						       "order",
-						       &diagram_order))
+							   "order",
+							   &diagram_order))
 				diagram_order = 500000;

 			addDiagram(diagram, diagram_order-1);
@@ -1691,11 +1693,16 @@ NamesList QETProject::namesListForIntegrationCategory()
 */
 void QETProject::writeBackup()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	QDomDocument xml_project(toXml());
-	QtConcurrent::run(QET::writeToFile,
-					  xml_project,
-					  &m_backup_file,
-					  nullptr);
+	QtConcurrent::run(
+				QET::writeToFile,xml_project,&m_backup_file,nullptr);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	qDebug()<<"Help code for QT 6 or later";
+#endif
 }

 /**
--- a/sources/qetxml.cpp
+++ b/sources/qetxml.cpp
@@ -274,7 +274,14 @@ bool QETXML::writeXmlFile(
 	}

 	QTextStream out(&file);
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	out.setCodec("UTF-8");
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	out.setEncoding(QStringConverter::Utf8);
+#endif
 	out.setGenerateByteOrderMark(false);
 	out << xml_document.toString(4);
 	file.close();
@@ -314,9 +321,9 @@ QVector<QDomElement> QETXML::directChild(
 {
 	QVector<QDomElement> return_list;
 	for (
-	     QDomNode node = element.firstChild() ;
-	     !node.isNull() ;
-	     node = node.nextSibling())
+		 QDomNode node = element.firstChild() ;
+		 !node.isNull() ;
+		 node = node.nextSibling())
 	{
 		if (!node.isElement()) continue;
 		QDomElement element = node.toElement();
@@ -345,18 +352,18 @@ QVector<QDomElement> QETXML::subChild(
 	QVector<QDomElement> return_list;

 	for (
-	     QDomNode child = element.firstChild() ;
-	     !child.isNull() ;
-	     child = child.nextSibling())
+		 QDomNode child = element.firstChild() ;
+		 !child.isNull() ;
+		 child = child.nextSibling())
 	{
 		QDomElement parents = child.toElement();
 		if (parents.isNull() || parents.tagName() != parent_tag_name)
 			continue;

 		for (
-		     QDomNode node_children = parents.firstChild() ;
-		     !node_children.isNull() ;
-		     node_children = node_children.nextSibling())
+			 QDomNode node_children = parents.firstChild() ;
+			 !node_children.isNull() ;
+			 node_children = node_children.nextSibling())
 		{
 			QDomElement n_children = node_children.toElement();
 			if (!n_children.isNull() && n_children.tagName() == children_tag_name)
--- a/sources/qtextorientationwidget.cpp
+++ b/sources/qtextorientationwidget.cpp
@@ -17,6 +17,7 @@
 */
 #include "qtextorientationwidget.h"
 #include <algorithm>
+#include <QMouseEvent>

 /**
 	Constructeur
@@ -254,8 +255,14 @@ void QTextOrientationWidget::paintEvent(QPaintEvent *event) {
 */
 void QTextOrientationWidget::mouseMoveEvent(QMouseEvent *event) {
 	if (read_only_) return;
-	
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	bool drawn_angle_hovered = positionIsASquare(event -> localPos(), &highlight_angle_);
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	bool drawn_angle_hovered = positionIsASquare(event -> position(), &highlight_angle_);
+#endif

 	if (must_highlight_angle_ != drawn_angle_hovered) {
 		must_highlight_angle_ = drawn_angle_hovered;
@@ -271,8 +278,14 @@ void QTextOrientationWidget::mouseReleaseEvent(QMouseEvent *event) {
 	if (read_only_) return;

 	double clicked_angle;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 	bool drawn_angle_clicked = positionIsASquare(event -> localPos(), &clicked_angle);
-	
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+	bool drawn_angle_clicked = positionIsASquare(event -> position(), &clicked_angle);
+#endif
 	if (drawn_angle_clicked) {
 		setOrientation(clicked_angle);
 		emit(orientationChanged(clicked_angle));
--- a/sources/richtext/richtexteditor.cpp
+++ b/sources/richtext/richtexteditor.cpp
@@ -75,6 +75,7 @@
 #include <QHBoxLayout>
 #include <QPushButton>
 #include <QDialogButtonBox>
+#include <QActionGroup>

 QT_BEGIN_NAMESPACE

@@ -86,14 +87,14 @@ QT_BEGIN_NAMESPACE

 namespace qdesigner_internal {
 	// Richtext simplification filter helpers: Elements to be discarded
-	static inline bool filterElement(const QStringRef &name)
+	static inline bool filterElement(const QStringView &name)
 	{
 		return name != QLatin1String("meta") && name != QLatin1String("style");
 	}

 	// Richtext simplification filter helpers: Filter attributes of elements
 	static inline void filterAttributes(
-			const QStringRef &name,
+			const QStringView &name,
 			QXmlStreamAttributes *atts,
 			bool *paragraphAlignmentFound)
 	{
@@ -122,8 +123,8 @@ namespace qdesigner_internal {
 		}
 	}

-	// Richtext simplification filter helpers: Check for blank QStringRef.
-	static inline bool isWhiteSpace(const QStringRef &in)
+	// Richtext simplification filter helpers: Check for blank QStringView.
+	static inline bool isWhiteSpace(const QStringView &in)
 	{
 		const int count = in.size();
 		for (int i = 0; i < count; i++)
@@ -150,7 +151,7 @@ namespace qdesigner_internal {
 			case QXmlStreamReader::StartElement:
 				elementCount++;
 				if (filterElement(reader.name())) {
-					const QStringRef name = reader.name();
+					const QStringView name = reader.name();
 					QXmlStreamAttributes attributes = reader.attributes();
 					filterAttributes(name, &attributes, &paragraphAlignmentFound);
 					writer.writeStartElement(name.toString());
--- a/sources/titleblocktemplate.cpp
+++ b/sources/titleblocktemplate.cpp
@@ -56,7 +56,7 @@ TitleBlockCell *TitleBlockTemplate::createCell(
 		const TitleBlockCell *existing_cell) {
 	TitleBlockCell *new_cell =
 			existing_cell ? new TitleBlockCell(*existing_cell)
-				      : new TitleBlockCell();
+					  : new TitleBlockCell();
 	registered_cells_ << new_cell;
 	return(new_cell);
 }
@@ -260,8 +260,8 @@ TitleBlockTemplate *TitleBlockTemplate::clone() const
 */
 void TitleBlockTemplate::loadInformation(const QDomElement &xml_element) {
 	for (QDomNode n = xml_element.firstChild() ;
-	     !n.isNull() ;
-	     n = n.nextSibling()) {
+		 !n.isNull() ;
+		 n = n.nextSibling()) {
 		if (n.isElement() && n.toElement().tagName() == "information") {
 			setInformation(n.toElement().text());
 		}
@@ -291,12 +291,12 @@ bool TitleBlockTemplate::loadLogos(const QDomElement &xml_element, bool reset) {

 	// we look for //logos/logo elements
 	for (QDomNode n = xml_element.firstChild() ;
-	     !n.isNull() ;
-	     n = n.nextSibling()) {
+		 !n.isNull() ;
+		 n = n.nextSibling()) {
 		if (n.isElement() && n.toElement().tagName() == "logos") {
 			for (QDomNode p = n.firstChild() ;
-			     !p.isNull() ;
-			     p = p.nextSibling()) {
+				 !p.isNull() ;
+				 p = p.nextSibling()) {
 				if (p.isElement()  && p.toElement().tagName()
 						== "logo") {
 					loadLogo(p.toElement());
@@ -357,8 +357,8 @@ bool TitleBlockTemplate::loadGrid(const QDomElement &xml_element) {
 	// we parse the first available "grid" XML element
 	QDomElement grid_element;
 	for (QDomNode n = xml_element.firstChild() ;
-	     !n.isNull() ;
-	     n = n.nextSibling()) {
+		 !n.isNull() ;
+		 n = n.nextSibling()) {
 		if (n.isElement() && n.toElement().tagName() == "grid") {
 			grid_element = n.toElement();
 			break;
@@ -430,10 +430,10 @@ void TitleBlockTemplate::parseColumns(const QString &cols_string) {
 	QRegularExpression abs_col_size_format,rel_col_size_format;
 	abs_col_size_format.setPattern("^([0-9]+)(?:px)?$");
 	abs_col_size_format.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
-	//QRegExp rel_col_size_format("^([rt])([0-9]+)%$", Qt::CaseInsensitive);
 	rel_col_size_format.setPattern("^([rt])([0-9]+)%$");
 	rel_col_size_format.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
 	bool conv_ok;
+	qDebug() <<"is QRegularExpression ok?";

 #if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)	// ### Qt 6: remove
 	QStringList cols_descriptions =
@@ -471,7 +471,7 @@ void TitleBlockTemplate::parseColumns(const QString &cols_string) {
 	foreach (TitleBlockColDimension icd, columns_width_) {
 		qDebug() << Q_FUNC_INFO
 			 << QString("%1 [%2]").arg(icd.value).arg(
-				    QET::titleBlockColumnLengthToString(icd.type));
+					QET::titleBlockColumnLengthToString(icd.type));
 	}
 #endif
 }
@@ -487,8 +487,8 @@ bool TitleBlockTemplate::loadCells(const QDomElement &xml_element) {
 	// we are interested by the "logo" and "field" elements
 	QDomElement grid_element;
 	for (QDomNode n = xml_element.firstChild() ;
-	     !n.isNull() ;
-	     n = n.nextSibling()) {
+		 !n.isNull() ;
+		 n = n.nextSibling()) {
 		if (!n.isElement()) continue;
 		QDomElement cell_element = n.toElement();
 		if (cell_element.tagName() == "field"
@@ -648,9 +648,9 @@ void TitleBlockTemplate::saveCell(TitleBlockCell *cell,
 	cell_elmt.setAttribute("row", cell -> num_row);
 	cell_elmt.setAttribute("col", cell -> num_col);
 	if (cell -> row_span) cell_elmt.setAttribute("rowspan",
-						     cell -> row_span);
+							 cell -> row_span);
 	if (cell -> col_span) cell_elmt.setAttribute("colspan",
-						     cell -> col_span);
+							 cell -> col_span);

 	// save other information
 	cell -> saveContentToXml(cell_elmt);
@@ -1134,8 +1134,8 @@ void TitleBlockTemplate::addColumn(int i) {
 	@return true
 */
 bool TitleBlockTemplate::insertColumn(const TitleBlockDimension &dimension,
-				      const QList<TitleBlockCell *> &column,
-				      int i) {
+					  const QList<TitleBlockCell *> &column,
+					  int i) {
 	int index = (i == -1) ? columns_width_.count() : i;
 	cells_.insert(index, column);
 	columns_width_.insert(index, dimension);
@@ -1213,11 +1213,11 @@ QSet<TitleBlockCell *> TitleBlockTemplate::spannedCells(
 	if (!final_row_span && !final_col_span) return(set);

 	for (int i = given_cell -> num_col ;
-	     i <= given_cell -> num_col + final_col_span ;
-	     ++ i) {
+		 i <= given_cell -> num_col + final_col_span ;
+		 ++ i) {
 		for (int j = given_cell -> num_row ;
-		     j <= given_cell -> num_row + final_row_span ;
-		     ++ j) {
+			 j <= given_cell -> num_row + final_row_span ;
+			 ++ j) {
 			if (i == given_cell -> num_col && j
 					== given_cell -> num_row)
 				continue;
@@ -1257,7 +1257,7 @@ QHash<TitleBlockCell *, QPair<int, int> > TitleBlockTemplate::getAllSpans(
 	@param spans :
 */
 void TitleBlockTemplate::setAllSpans(const QHash<TitleBlockCell *,
-				     QPair<int, int> > &spans) {
+					 QPair<int, int> > &spans) {
 	foreach (TitleBlockCell *cell, spans.keys()) {
 		cell -> row_span = spans[cell].first;
 		cell -> col_span = spans[cell].second;
@@ -1344,9 +1344,9 @@ bool TitleBlockTemplate::addLogoFromFile(const QString &filepath,

 	// we then try to add it as a bitmap image
 	return addLogo(filename,
-		       &file_content,
-		       filepath_info.suffix(),
-		       "base64");
+			   &file_content,
+			   filepath_info.suffix(),
+			   "base64");
 }

 /**
@@ -1405,7 +1405,7 @@ bool TitleBlockTemplate::removeLogo(const QString &logo_name) {
 	@return
 */
 bool TitleBlockTemplate::renameLogo(const QString &logo_name,
-				    const QString &new_name) {
+					const QString &new_name) {
 	if (!data_logos_.contains(logo_name)
 			|| data_logos_.contains(new_name)) {
 		return(false);
@@ -1531,8 +1531,8 @@ void TitleBlockTemplate::render(QPainter &painter,
 			// calculate the border rect of the current cell
 			int x = lengthRange(0, cells_[i][j] -> num_col, widths);
 			int y = lengthRange(0,
-					    cells_[i][j] -> num_row,
-					    rows_heights_);
+						cells_[i][j] -> num_row,
+						rows_heights_);

 			int row_span = 0, col_span = 0;
 			if (cells_[i][j] -> span_state
@@ -1541,11 +1541,11 @@ void TitleBlockTemplate::render(QPainter &painter,
 				col_span = cells_[i][j] -> applied_col_span;
 			}
 			int w = lengthRange(cells_[i][j] -> num_col,
-					    cells_[i][j] -> num_col + 1 + col_span,
-					    widths);
+						cells_[i][j] -> num_col + 1 + col_span,
+						widths);
 			int h = lengthRange(cells_[i][j] -> num_row,
-					    cells_[i][j] -> num_row + 1 + row_span,
-					    rows_heights_);
+						cells_[i][j] -> num_row + 1 + row_span,
+						rows_heights_);
 			QRect cell_rect(x, y, w, h);

 			renderCell(painter, *cells_[i][j],
@@ -1576,7 +1576,7 @@ void TitleBlockTemplate::renderDxf(QRectF &title_block_rect,
 	QList<int> widths = columnsWidth(titleblock_width);

 	// draw the titleblock border
-    double xCoord    = title_block_rect.topLeft().x()*Createdxf::xScale;
+	double xCoord    = title_block_rect.topLeft().x()*Createdxf::xScale;
 	double yCoord    =
 		Createdxf::sheetHeight
 			- title_block_rect.bottomLeft().y()
@@ -1600,9 +1600,9 @@ void TitleBlockTemplate::renderDxf(QRectF &title_block_rect,

 			// calculate the border rect of the current cell
 			double x = lengthRange(0, cells_[i][j] -> num_col,
-					       widths);
+						   widths);
 			double y = lengthRange(0, cells_[i][j] -> num_row,
-					       rows_heights_);
+						   rows_heights_);

 			int row_span = 0, col_span = 0;
 			if (cells_[i][j] -> span_state
@@ -1611,11 +1611,11 @@ void TitleBlockTemplate::renderDxf(QRectF &title_block_rect,
 				col_span = cells_[i][j] -> applied_col_span;
 			}
 			double w = lengthRange(cells_[i][j] -> num_col,
-					       cells_[i][j] -> num_col + 1 + col_span,
-					       widths);
+						   cells_[i][j] -> num_col + 1 + col_span,
+						   widths);
 			double h = lengthRange(cells_[i][j] -> num_row,
-					       cells_[i][j] -> num_row + 1 + row_span,
-					       rows_heights_);
+						   cells_[i][j] -> num_row + 1 + row_span,
+						   rows_heights_);

 			x = xCoord + x*Createdxf::xScale;
 			h *= Createdxf::yScale;
@@ -1655,9 +1655,9 @@ void TitleBlockTemplate::renderDxf(QRectF &title_block_rect,
 	Rectangle the cell must be rendered into.
 */
 void TitleBlockTemplate::renderCell(QPainter &painter,
-				    const TitleBlockCell &cell,
-				    const DiagramContext &diagram_context,
-				    const QRect &cell_rect) const
+					const TitleBlockCell &cell,
+					const DiagramContext &diagram_context,
+					const QRect &cell_rect) const
 {
 	// draw the border rect of the current cell
 	QPen pen(QBrush(), 0.0, Qt::SolidLine, Qt::SquareCap, Qt::MiterJoin);
@@ -1819,7 +1819,7 @@ void TitleBlockTemplate::renderTextCell(QPainter &painter,
 			QRectF new_world_cell_rect(cell_rect);
 			new_world_cell_rect.moveTo(0, 0.0);
 			new_world_cell_rect.setWidth(new_world_cell_rect.width()
-						     / ratio);
+							 / ratio);
 			painter.drawText(new_world_cell_rect,
 					 cell.alignment,
 					 text);
@@ -2014,11 +2014,11 @@ bool TitleBlockTemplate::checkCellSpan(TitleBlockCell *cell) {

 	// ensure cells that will be spanned are either empty or free
 	for (int i = cell -> num_col ;
-	     i <= cell -> num_col + cell -> applied_col_span ;
-	     ++ i) {
+		 i <= cell -> num_col + cell -> applied_col_span ;
+		 ++ i) {
 		for (int j = cell -> num_row ;
-		     j <= cell -> num_row + cell -> applied_row_span ;
-		     ++ j) {
+			 j <= cell -> num_row + cell -> applied_row_span ;
+			 ++ j) {
 			if (i == cell -> num_col && j == cell -> num_row)
 				continue;
 #ifdef TITLEBLOCK_TEMPLATE_DEBUG
@@ -2031,8 +2031,8 @@ bool TitleBlockTemplate::checkCellSpan(TitleBlockCell *cell) {
 						current_cell -> spanner_cell
 						&& current_cell -> spanner_cell
 						!= cell
-					    )
-			    ) {
+						)
+				) {
 				cell -> span_state = TitleBlockCell::Disabled;
 				return(true);
 			}
@@ -2058,11 +2058,11 @@ void TitleBlockTemplate::applyCellSpan(TitleBlockCell *cell)

 	// goes through every spanned cell
 	for (int i = cell -> num_col ;
-	     i <= cell -> num_col + cell -> applied_col_span ;
-	     ++ i) {
+		 i <= cell -> num_col + cell -> applied_col_span ;
+		 ++ i) {
 		for (int j = cell -> num_row ;
-		     j <= cell -> num_row + cell -> applied_row_span ;
-		     ++ j) {
+			 j <= cell -> num_row + cell -> applied_row_span ;
+			 ++ j) {
 			// avoid the spanning cell itself
 			if (i == cell -> num_col && j == cell -> num_row)
 				continue;
--- a/sources/undocommand/deleteqgraphicsitemcommand.cpp
+++ b/sources/undocommand/deleteqgraphicsitemcommand.cpp
@@ -191,7 +191,14 @@ void DeleteQGraphicsItemCommand::setPotentialsOfRemovedElements()

 				if (exist_ == false)
 				{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
 					m_connected_terminals.append(qMakePair<Terminal *, Terminal *>(hub_terminal, t));
+#else
+#if TODO_LIST
+#pragma message("@TODO remove code for QT 6 or later")
+#endif
+					qDebug()<<"Help code for QT 6 or later";
+#endif
 					Conductor *new_cond = new Conductor(hub_terminal, t);
 					new_cond->setProperties(properties);
 					new AddItemCommand<Conductor*>(new_cond, t->diagram(), QPointF(), this);
--- a/sources/undocommand/linkelementcommand.cpp
+++ b/sources/undocommand/linkelementcommand.cpp
@@ -285,6 +285,10 @@ void LinkElementCommand::makeLink(const QList<Element *> &element_list)

 	//All elements stored in to_unlink is unwanted we unlink it from m_element
 	if (!to_unlink.isEmpty())
+	{
 		foreach(Element *elmt, to_unlink)
+		{
 			m_element->unlinkElement(elmt);
+		}
+	}
 }