printing: convert to two stage approach

The double connect to onLoadFinished clearly was incorrect, but even with
that removed we still seemed to call the printer before the modified page
finished loading.

Moving the profilesMissing = false setting into the callback also seems
obviously correct, but also wasn't enough to make this work.

So in the end I went the brute force route.
We run the Javascript code to insert the profile images (which is done
in JS to stay compatible with existing templates - yes, this could be
reimplemented differently using Qt primitives - but that would result in
parsing HTML code and that really is what WebEngine is for and the JS
code is known to work...).
And then we write the new HTML out to a file and load that file.
And once THAT file finishes loading (now with all the profiles - if
there were any in the template in the first place), send that to be
printed.

This seems convoluted and silly - but I simply couldn't get a single
step flow to work on openSUSE (which is where this was tested and
implemented).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

.github/workflows/linux-bionic-5.9.yml

@@ -29,12 +29,13 @@ jobs:
         qml-module-qtquick2 qt5-default qt5-qmake qtchooser qtconnectivity5-dev \
         qtdeclarative5-dev qtdeclarative5-private-dev qtlocation5-dev \
         qtpositioning5-dev qtscript5-dev qttools5-dev qttools5-dev-tools \
+        qtwebengine5-dev \
         qtquickcontrols2-5-dev xvfb libbluetooth-dev libmtp-dev
 
     - name: build Subsurface
       run: |
         cd ..
-        bash -x subsurface/scripts/build.sh -desktop -build-with-webkit
+        bash -x subsurface/scripts/build.sh -desktop -build-with-webkit -print-with-webengine
 
     - name: test desktop build
       run: |

.github/workflows/linux-focal-5.12.yml

@@ -33,6 +33,7 @@ jobs:
         qml-module-qtquick2 qt5-qmake qtchooser qtconnectivity5-dev \
         qtdeclarative5-dev qtdeclarative5-private-dev qtlocation5-dev \
         qtpositioning5-dev qtscript5-dev qttools5-dev qttools5-dev-tools \
+        qtwebengine5-dev \
         qtquickcontrols2-5-dev xvfb libbluetooth-dev libmtp-dev
 
     - name: build Subsurface-mobile
@@ -60,7 +61,7 @@ jobs:
 
         # now build for the desktop version (including WebKit)
         cd ..
-        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit
+        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit -print-with-webengine
 
     - name: test desktop build
       run: |

.github/workflows/linux-groovy-5.14.yml

@@ -33,6 +33,7 @@ jobs:
         qml-module-qtquick2 qt5-qmake qtchooser qtconnectivity5-dev \
         qtdeclarative5-dev qtdeclarative5-private-dev qtlocation5-dev \
         qtpositioning5-dev qtscript5-dev qttools5-dev qttools5-dev-tools \
+        qtwebengine5-dev \
         qtquickcontrols2-5-dev xvfb libbluetooth-dev libmtp-dev
 
     - name: build Subsurface-mobile
@@ -60,7 +61,7 @@ jobs:
 
         # now build for the desktop version (including WebKit)
         cd ..
-        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit
+        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit -print-with-webengine
 
     - name: test desktop build
       run: |

.github/workflows/linux-hirsute-5.15.yml

@@ -33,6 +33,7 @@ jobs:
         qml-module-qtquick2 qt5-qmake qtchooser qtconnectivity5-dev \
         qtdeclarative5-dev qtdeclarative5-private-dev qtlocation5-dev \
         qtpositioning5-dev qtscript5-dev qttools5-dev qttools5-dev-tools \
+        qtwebengine5-dev \
         qtquickcontrols2-5-dev xvfb libbluetooth-dev libmtp-dev
 
     - name: build Subsurface-mobile
@@ -60,7 +61,7 @@ jobs:
 
         # now build for the desktop version (including WebKit)
         cd ..
-        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit
+        bash -e -x subsurface/scripts/build.sh -desktop -build-with-webkit -print-with-webengine
 
     - name: test desktop build
       run: |

CMakeLists.txt

@@ -51,6 +51,7 @@ option(NO_USERMANUAL "don't include a viewer for the user manual" OFF)
 #Options regarding enabling parts of subsurface
 option(BTSUPPORT "enable support for QtBluetooth (requires Qt5.4 or newer)" ON)
 option(FTDISUPPORT "enable support for libftdi based serial" OFF)
+option(USE_WEBENGINE "Use QWebEngine instead of QWebKit" OFF)
 
 # Options regarding What should we build on subsurface
 option(MAKE_TESTS "Make the tests" ON)
@@ -189,10 +190,14 @@ if (SUBSURFACE_TARGET_EXECUTABLE MATCHES "DesktopExecutable")
 		add_definitions(-DNO_PRINTING)
 	else()
 		LIST(APPEND QT_EXTRA_COMPONENTS PrintSupport)
+		if(USE_WEBENGINE)
+			LIST(APPEND QT_EXTRA_COMPONENTS WebEngine)
+		else()
 			# Because Qt5WebKitWidgets isn't a part of the "regular" Qt5, we can't get it the normal way
 			find_package(Qt5WebKitWidgets REQUIRED)
 			set(SUBSURFACE_LINK_LIBRARIES ${SUBSURFACE_LINK_LIBRARIES} Qt5::WebKitWidgets)
 		endif()
+	endif()
 elseif (SUBSURFACE_TARGET_EXECUTABLE MATCHES "MobileExecutable")
 	if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
 		set(SUBSURFACE_TARGET Subsurface-mobile)
@@ -531,6 +536,11 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
 		install(CODE "execute_process(COMMAND cp -a ${_qt5Core_install_prefix}/qml/QtQml ${CMAKE_BINARY_DIR}/${APP_BUNDLE_DIR}/Contents/Resources/qml)")
 		install(CODE "execute_process(COMMAND cp -a ${_qt5Core_install_prefix}/qml/QtPositioning ${CMAKE_BINARY_DIR}/${APP_BUNDLE_DIR}/Contents/Resources/qml)")
 	endif()
+	# if we build with WebEngine we need to copy the helper which macdeployqt appears to get wrong as well
+	if(USE_WEBENGINE)
+		install(CODE "execute_process(COMMAND mkdir -p ${CMAKE_BINARY_DIR}/${APP_BUNDLE_DIR}/Contents/Frameworks/QtWebEngineCore.framework/Helpers)")
+		install(CODE "execute_process(COMMAND cp -a ${_qt5Core_install_prefix}/lib/QtWebEngineCore.framework/Helpers/QtWebEngineProcess.app ${CMAKE_BINARY_DIR}/${APP_BUNDLE_DIR}/Contents/Frameworks/QtWebEngineCore.framework/Helpers/)")
+	endif()
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
 	if (CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
 		if(NOT DEFINED OBJCOPY)

cmake/Modules/HandleUserManual.cmake

@@ -2,5 +2,11 @@ if(NO_USERMANUAL)
 	message(STATUS "building without usermanual")
 	add_definitions(-DNO_USERMANUAL)
 else()
+	if(USE_WEBENGINE)
+		message(STATUS "building with QWebEngine")
+		list(APPEND QT_EXTRA_COMPONENTS WebEngineWidgets)
+		add_definitions(-DUSE_WEBENGINE)
+	else()
 		list(APPEND QT_EXTRA_COMPONENTS WebKitWidgets)
+	endif()
 endif()

desktop-widgets/CMakeLists.txt

@@ -148,8 +148,6 @@ if(NOT NO_PRINTING)
 	set(SUBSURFACE_INTERFACE ${SUBSURFACE_INTERFACE}
 		printdialog.cpp
 		printdialog.h
-		printer.cpp
-		printer.h
 		printoptions.cpp
 		printoptions.h
 		templateedit.cpp
@@ -159,6 +157,18 @@ if(NOT NO_PRINTING)
 	)
 endif()
 
+if(USE_WEBENGINE)
+	set(SUBSURFACE_INTERFACE ${SUBSURFACE_INTERFACE}
+		printerwebengine.cpp
+		printerwebengine.h
+	)
+else()
+	set(SUBSURFACE_INTERFACE ${SUBSURFACE_INTERFACE}
+		printer.cpp
+		printer.h
+	)
+endif()
+
 if (BTSUPPORT)
 	set(SUBSURFACE_INTERFACE ${SUBSURFACE_INTERFACE}
 		btdeviceselectiondialog.cpp

desktop-widgets/printdialog.cpp

@@ -1,6 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "printdialog.h"
+#ifdef USE_WEBENGINE
+#include "printerwebengine.h"
+#else
 #include "printer.h"
+#endif
 #include "core/pref.h"
 #include "core/dive.h" // for existing_filename
 
@@ -14,6 +18,9 @@
 #include <QSettings>
 #include <QMessageBox>
 #include <QDialogButtonBox>
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#endif
 
 #define SETTINGS_GROUP "PrintDialog"
 
@@ -110,8 +117,11 @@ PrintDialog::PrintDialog(bool inPlanner, QWidget *parent) :
 	QPushButton *printButton = new QPushButton(tr("P&rint"));
 	connect(printButton, SIGNAL(clicked(bool)), this, SLOT(printClicked()));
 
+	// To do: Port preview to WebEngine. For the time being: Use OS print preview
+#ifndef USE_WEBENGINE
 	QPushButton *previewButton = new QPushButton(tr("&Preview"));
 	connect(previewButton, SIGNAL(clicked(bool)), this, SLOT(previewClicked()));
+#endif
 
 	QPushButton *exportHtmlButton = new QPushButton(tr("Export Html"));
 	connect(exportHtmlButton, SIGNAL(clicked(bool)), this, SLOT(exportHtmlClicked()));
@@ -119,7 +129,9 @@ PrintDialog::PrintDialog(bool inPlanner, QWidget *parent) :
 	QDialogButtonBox *buttonBox = new QDialogButtonBox;
 	buttonBox->addButton(QDialogButtonBox::Cancel);
 	buttonBox->addButton(printButton, QDialogButtonBox::AcceptRole);
+#ifndef USE_WEBENGINE
 	buttonBox->addButton(previewButton, QDialogButtonBox::ActionRole);
+#endif
 	buttonBox->addButton(exportHtmlButton, QDialogButtonBox::AcceptRole);
 
 	connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
@@ -178,7 +190,7 @@ void PrintDialog::createPrinterObj()
 		qprinter = new QPrinter;
 		qprinter->setResolution(printOptions.resolution);
 		qprinter->setOrientation((QPrinter::Orientation)printOptions.landscape);
-		printer = new Printer(qprinter, printOptions, templateOptions, Printer::PRINT, inPlanner);
+		printer = new Printer(qprinter, printOptions, templateOptions, Printer::PRINT, inPlanner, nullptr);
 	}
 }
 
@@ -215,13 +227,26 @@ void PrintDialog::printClicked(void)
 {
 	createPrinterObj();
 	QPrintDialog printDialog(qprinter, this);
+#ifdef USE_WEBENGINE
+	connect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
+	connect(printer, &Printer::jobDone, this, &PrintDialog::printingDone);
+	printer->print();
+#else
 	if (printDialog.exec() == QDialog::Accepted) {
 		connect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
 		printer->print();
 		close();
 	}
+#endif
 }
 
+#ifdef USE_WEBENGINE
+void PrintDialog::printingDone()
+{
+	close();
+}
+#endif
+
 void PrintDialog::onPaintRequested(QPrinter*)
 {
 	createPrinterObj();

desktop-widgets/printdialog.h

@@ -38,6 +38,13 @@ slots:
 	void printClicked();
 	void onPaintRequested(QPrinter *);
 	void createPrinterObj();
+
+#ifdef USE_WEBENGINE
+public
+slots:
+	void printingDone();
+#endif
 };
+
 #endif
 #endif // PRINTDIALOG_H

desktop-widgets/printer.cpp

@@ -14,7 +14,7 @@
 #include <QWebElement>
 #include "profile-widget/profilewidget2.h"
 
-Printer::Printer(QPaintDevice *paintDevice, const print_options &printOptions, const template_options &templateOptions, PrintMode printMode, bool inPlanner) :
+Printer::Printer(QPaintDevice *paintDevice, const print_options &printOptions, const template_options &templateOptions, PrintMode printMode, bool inPlanner, QWidget *parent = nullptr) :
 	paintDevice(paintDevice),
 	webView(new QWebView),
 	printOptions(printOptions),
@@ -267,8 +267,6 @@ void Printer::previewOnePage()
 		pageSize.setHeight(paintDevice->height());
 		pageSize.setWidth(paintDevice->width());
 		webView->page()->setViewportSize(pageSize);
-		// initialize the border settings
-		// templateOptions.border_width = std::max(1, pageSize.width() / 1000);
 		if (printOptions.type == print_options::DIVELIST)
 			webView->setHtml(t.generate(inPlanner));
 		else if (printOptions.type == print_options::STATISTICS )

desktop-widgets/printer.h

@@ -38,7 +38,7 @@ private slots:
 	void templateProgessUpdated(int value);
 
 public:
-	Printer(QPaintDevice *paintDevice, const print_options &printOptions, const template_options &templateOptions, PrintMode printMode, bool inPlanner);
+	Printer(QPaintDevice *paintDevice, const print_options &printOptions, const template_options &templateOptions, PrintMode printMode, bool inPlanner, QWidget *parent);
 	~Printer();
 	void print();
 	void previewOnePage();

desktop-widgets/printerwebengine.cpp

@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "printerwebengine.h"
+#include "mainwindow.h"
+#include "templatelayout.h"
+#include "core/statistics.h"
+#include "core/qthelper.h"
+#include "core/settings/qPrefDisplay.h"
+#include "profile-widget/profilewidget2.h"
+
+#include <algorithm>
+#include <QPainter>
+#include <QPrinter>
+#include <QtWebEngineWidgets>
+
+extern void exportProfile(const struct dive *dive, const QString filename);
+
+Printer::Printer(QPaintDevice *paintDevice, print_options &printOptions, template_options &templateOptions, PrintMode printMode, bool inPlanner, QWidget *parent = nullptr) :
+	paintDevice(paintDevice),
+	printOptions(printOptions),
+	templateOptions(templateOptions),
+	printMode(printMode),
+	inPlanner(inPlanner),
+	done(0)
+{
+	webView = new QWebEngineView(parent);
+	connect(webView, &QWebEngineView::loadFinished, this, &Printer::onLoadFinished);
+	if (printMode == PRINT) {
+		connect(this, &Printer::profilesInserted, this, &Printer::reopen);
+		connect(this, &Printer::jobDone, this, &Printer::printFinished);
+	}
+	profilesMissing = true;
+}
+
+Printer::~Printer()
+{
+	qDebug() << "deleting Printer object";
+	delete webView;
+}
+
+void Printer::onLoadFinished()
+{
+	qDebug() << "onLoadFinished called with profilesMissing" << profilesMissing << "and URL" << webView->url().toString();
+	if (profilesMissing) {
+		QString jsText("   var profiles = document.getElementsByClassName(\"diveProfile\");\
+			       for (let profile of profiles) { \
+				  var id = profile.attributes.getNamedItem(\"Id\").value; \
+				  var img = document.createElement(\"img\"); \
+				  img.src = \"TMPPATH\" + id + \".png\"; \
+				  img.style.height = \"100%\"; \
+				  img.style.width = \"100%\"; \
+				  profile.appendChild(img); \
+				} \
+				document.documentElement.innerHTML; \
+			");
+		QString filePath = QStringLiteral("file://") + printDir.path() + QDir::separator();
+		jsText.replace("TMPPATH", filePath);
+		webView->page()->runJavaScript(jsText, [this](const QVariant &v) {
+					qDebug() << "JS finished";
+					QFile fd(printDir.filePath("finalprint.html"));
+					fd.open(QIODevice::WriteOnly | QIODevice::Text);
+					QTextStream out(&fd);
+					out << v.toString();
+					fd.close();
+					qDebug() << "finalprint.html written";
+					profilesMissing = false;
+					emit(progessUpdated(80));
+					emit profilesInserted();
+				});
+	} else {
+		qDebug() << "load of" << webView->url().toString() << "finished - open printing dialog";
+		emit(progessUpdated(100));
+		printing();
+	}
+}
+
+// the Javascript code injecting the profiles has completed, let's reload that page
+void Printer::reopen()
+{
+	qDebug() << "opening the finalprint.html file";
+	webView->load(QUrl::fromLocalFile(printDir.filePath("finalprint.html")));
+}
+
+void Printer::printing()
+{
+	QPrintDialog printDialog(&printer, (QWidget *) nullptr);
+	if (printDialog.exec() == QDialog::Accepted)
+		webView->page()->print(&printer, [this](bool ok){
+			if (ok)
+				emit jobDone();
+			qDebug() << "printing done with status " << ok ;
+			qDebug() << "content of" << printDir.path();
+			qDebug() << QDir(printDir.path()).entryList();
+		});
+	qDebug() << "closing the dialog now";
+	printDialog.close();
+}
+
+//value: ranges from 0 : 100 and shows the progress of the templating engine
+void Printer::templateProgessUpdated(int value)
+{
+	done = value / 5; //template progess if 1/5 of total work
+	emit progessUpdated(done);
+}
+
+QString Printer::exportHtml()
+{
+	// Does anybody actually use this? It will not contian profile images!!!
+	TemplateLayout t(printOptions, templateOptions);
+	connect(&t, SIGNAL(progressUpdated(int)), this, SLOT(templateProgessUpdated(int)));
+	QString html;
+
+	if (printOptions.type == print_options::DIVELIST)
+		html = t.generate(inPlanner);
+	else if (printOptions.type == print_options::STATISTICS )
+		html = t.generateStatistics();
+
+	// TODO: write html to file
+	return html;
+}
+
+void Printer::updateOptions(print_options &poptions, template_options &toptions)
+{
+	templateOptions = toptions;
+	printOptions = poptions;
+	profilesMissing = true;
+}
+
+QString Printer::writeTmpTemplate(const QString templtext)
+{
+	QFile fd(printDir.filePath("ssrftmptemplate.html"));
+
+	fd.open(QIODevice::WriteOnly | QIODevice::Text);
+	QTextStream out(&fd);
+	out << templtext;
+	fd.close();
+	return fd.fileName();
+}
+
+void Printer::print()
+{
+	// we can only print if "PRINT" mode is selected
+	int i;
+	struct dive *dive;
+	QString fn;
+	int dives_to_print = 0;
+	for_each_dive(i, dive)
+		if (dive->selected || !printOptions.print_selected)
+			++dives_to_print;
+
+	for_each_dive (i, dive) {
+		//TODO check for exporting selected dives only
+		if (!dive->selected && printOptions.print_selected)
+			continue;
+		exportProfile(dive, printDir.filePath(QString("dive_%1.png").arg(dive->id)));
+		emit(progessUpdated(done + lrint(i * 80.0 / dives_to_print)));
+	}
+
+	profilesMissing = true;
+	TemplateLayout t(printOptions, templateOptions);
+	connect(&t, SIGNAL(progressUpdated(int)), this, SLOT(templateProgessUpdated(int)));
+	int dpi = printer.resolution();
+	webView->page()->settings()->setAttribute(QWebEngineSettings::LocalContentCanAccessFileUrls, true);
+
+	if (printOptions.type == print_options::DIVELIST) {
+		QFile printFile(printDir.filePath("print.html"));
+		printFile.open(QIODevice::WriteOnly | QIODevice::Text);
+		QTextStream out(&printFile);
+		out << t.generate(inPlanner);
+		printFile.close();
+		webView->load(QUrl::fromLocalFile(printDir.filePath("print.html")));
+	} else if (printOptions.type == print_options::STATISTICS )
+		webView->setHtml(t.generateStatistics());
+	if (printOptions.color_selected && printer.colorMode())
+		printer.setColorMode(QPrinter::Color);
+	else
+		printer.setColorMode(QPrinter::GrayScale);
+	printer.setResolution(dpi);
+}
+
+void Printer::printFinished()
+{
+	qDebug() << "received the jobDone signal, closing the dialog; page should have referenced:";
+	webView->page()->toHtml([](const QString h){
+		QRegularExpression img("img src=([^ ]+) ");
+		QRegularExpressionMatchIterator iter = img.globalMatch(h);
+		while(iter.hasNext()) {
+			QRegularExpressionMatch match = iter.next();
+			QString filename = match.captured(1).replace("file://", "");
+			qDebug() << filename << (QFile(filename).exists() ? "which does" : "which doesn't") << "exist";
+		}
+	});
+
+}

desktop-widgets/printerwebengine.h

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef PRINTER_H
+#define PRINTER_H
+
+#include "printoptions.h"
+
+#include <QPrinter>
+#include <QTemporaryDir>
+
+class ProfileWidget2;
+class QPainter;
+class QPaintDevice;
+class QRect;
+class QWebEngineView;
+
+
+class Printer : public QObject {
+	Q_OBJECT
+
+public:
+	enum PrintMode {
+		PRINT,
+		PREVIEW
+	};
+	QWebEngineView *webView;
+
+private:
+	QPaintDevice *paintDevice;
+	QPrinter printer;
+	QTemporaryDir printDir;
+	print_options &printOptions;
+	template_options &templateOptions;
+	QSize pageSize;
+	PrintMode printMode;
+	bool inPlanner;
+	int done;
+	void onLoadFinished();
+	bool profilesMissing;
+
+private slots:
+	void templateProgessUpdated(int value);
+	void printing();
+	void printFinished();
+	void reopen();
+
+public:
+	Printer(QPaintDevice *paintDevice, print_options &printOptions, template_options &templateOptions, PrintMode printMode, bool inPlanner, QWidget *parent);
+	~Printer();
+	void print();
+	void previewOnePage();
+	QString writeTmpTemplate(const QString templtext);
+	QString exportHtml();
+	void updateOptions(print_options &poptions, template_options &toptions);
+
+
+signals:
+	void progessUpdated(int value);
+	void profilesInserted();
+	void jobDone();
+};
+
+#endif //PRINTER_H

desktop-widgets/templateedit.cpp

@@ -1,15 +1,22 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "templateedit.h"
 #include "templatelayout.h"
+#ifdef USE_WEBENGINE
+#include "printerwebengine.h"
+#else
 #include "printer.h"
+#endif
 #include "ui_templateedit.h"
 
 #include <QMessageBox>
 #include <QButtonGroup>
 #include <QColorDialog>
 #include <QDir>
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#endif
 
-TemplateEdit::TemplateEdit(QWidget *parent, const print_options &printOptions, template_options &templateOptions) :
+TemplateEdit::TemplateEdit(QWidget *parent, print_options &printOptions, template_options &templateOptions) :
 	QDialog(parent),
 	ui(new Ui::TemplateEdit),
 	printOptions(printOptions),
@@ -43,7 +50,20 @@ TemplateEdit::TemplateEdit(QWidget *parent, const print_options &printOptions, t
 
 	ui->plainTextEdit->setPlainText(grantlee_template);
 	editingCustomColors = false;
+#ifdef USE_WEBENGINE
+	QWebEngineView *view;
+	preview = new Printer(nullptr, printOptions, newTemplateOptions, Printer::PREVIEW, false, this);
+	view = preview->webView;
+	int w = ui->label->width();
+	int h = ui->label->height();
+	view->resize(w, h);
+	preview->print();
+	view->setZoomFactor(0.25);
+	view->show();
+	ui->verticalLayout_3->replaceWidget(ui->label, view);
+#else
 	updatePreview();
+#endif
 }
 
 TemplateEdit::~TemplateEdit()
@@ -54,14 +74,16 @@ TemplateEdit::~TemplateEdit()
 
 void TemplateEdit::updatePreview()
 {
+#ifndef USE_WEBENGINE
 	// update Qpixmap preview
 	int width = ui->label->width();
 	int height = ui->label->height();
 	QPixmap map(width * 2, height * 2);
 	map.fill(QColor::fromRgb(255, 255, 255));
-	Printer printer(&map, printOptions, newTemplateOptions, Printer::PREVIEW, false);
+	Printer printer(&map, printOptions, newTemplateOptions, Printer::PREVIEW, false, nullptr);
 	printer.previewOnePage();
 	ui->label->setPixmap(map.scaled(width, height, Qt::IgnoreAspectRatio));
+#endif
 
 	// update colors tab
 	ui->colorLable1->setStyleSheet("QLabel { background-color : \"" + newTemplateOptions.color_palette.color1.name() + "\";}");
@@ -158,6 +180,7 @@ void TemplateEdit::saveSettings()
 			}
 			if (templateOptions.color_palette_index == CUSTOM)
 				custom_colors = templateOptions.color_palette;
+			emit accept();
 		}
 	}
 }
@@ -165,6 +188,7 @@ void TemplateEdit::saveSettings()
 void TemplateEdit::on_buttonBox_clicked(QAbstractButton *button)
 {
 	QDialogButtonBox::StandardButton standardButton = ui->buttonBox->standardButton(button);
+	QString template_file = printOptions.p_template;
 	switch (standardButton) {
 	case QDialogButtonBox::Ok:
 		saveSettings();
@@ -172,7 +196,14 @@ void TemplateEdit::on_buttonBox_clicked(QAbstractButton *button)
 	case QDialogButtonBox::Cancel:
 		break;
 	case QDialogButtonBox::Apply:
+#ifdef USE_WEBENGINE
+		printOptions.p_template = preview->writeTmpTemplate(ui->plainTextEdit->toPlainText());
+		preview->updateOptions(printOptions, templateOptions);
+		preview->print();
+		printOptions.p_template = template_file;
+#else
 		saveSettings();
+#endif
 		updatePreview();
 		break;
 	default:

desktop-widgets/templateedit.h

@@ -4,6 +4,9 @@
 
 #include <QDialog>
 #include "printoptions.h"
+#ifdef USE_WEBENGINE
+#include "printerwebengine.h"
+#endif
 
 namespace Ui {
 class TemplateEdit;
@@ -14,7 +17,7 @@ class TemplateEdit : public QDialog
 	Q_OBJECT
 
 public:
-	explicit TemplateEdit(QWidget *parent, const print_options &printOptions, template_options &templateOptions);
+	explicit TemplateEdit(QWidget *parent, print_options &printOptions, template_options &templateOptions);
 	~TemplateEdit();
 private slots:
 	void on_fontsize_valueChanged(int font_size);
@@ -29,13 +32,15 @@ private:
 	Ui::TemplateEdit *ui;
 	QButtonGroup *btnGroup;
 	bool editingCustomColors;
-	const print_options &printOptions;
+	print_options &printOptions;
 	template_options &templateOptions;
 	struct template_options newTemplateOptions;
 	QString grantlee_template;
 	void saveSettings();
 	void updatePreview();
-
+#ifdef USE_WEBENGINE
+	Printer *preview;
+#endif
 };
 
 #endif // TEMPLATEEDIT_H

desktop-widgets/templateedit.ui

@@ -571,22 +571,6 @@
  </widget>
  <resources/>
  <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>accepted()</signal>
-   <receiver>TemplateEdit</receiver>
-   <slot>accept()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>248</x>
-     <y>254</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>157</x>
-     <y>274</y>
-    </hint>
-   </hints>
-  </connection>
   <connection>
    <sender>buttonBox</sender>
    <signal>rejected()</signal>

desktop-widgets/templatelayout.cpp

@@ -152,7 +152,13 @@ QString TemplateLayout::generateStatistics()
 
 QString TemplateLayout::readTemplate(QString template_name)
 {
-	QFile qfile(getPrintingTemplatePathUser() + QDir::separator() + template_name);
+	QString filename;
+	// are we using a temporary file while editing?
+	if (template_name.contains("ssrftmptemplate.html"))
+		filename = template_name;
+	else
+		filename = getPrintingTemplatePathUser() + QDir::separator() + template_name;
+	QFile qfile(filename);
 	if (qfile.open(QFile::ReadOnly | QFile::Text)) {
 		QTextStream in(&qfile);
 		return in.readAll();

desktop-widgets/usermanual.cpp

@@ -35,6 +35,26 @@ void SearchBar::enableButtons(const QString &s)
 	ui.findNext->setEnabled(s.length());
 }
 
+#ifdef USE_WEBENGINE
+MyQWebEnginePage::MyQWebEnginePage(QObject* parent) : QWebEnginePage(parent)
+{
+}
+
+bool MyQWebEnginePage::acceptNavigationRequest(const QUrl & url, QWebEnginePage::NavigationType type, bool)
+{
+	if (type == QWebEnginePage::NavigationTypeLinkClicked)
+	{
+		QDesktopServices::openUrl(url);
+		return false;
+	}
+	return true;
+}
+
+MyQWebEngineView::MyQWebEngineView(QWidget* parent)
+{
+}
+#endif
+
 UserManual::UserManual(QWidget *parent) : QDialog(parent)
 {
 	QShortcut *closeKey = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this);
@@ -55,12 +75,19 @@ UserManual::UserManual(QWidget *parent) : QDialog(parent)
 	setWindowTitle(tr("User manual"));
 	setWindowIcon(QIcon(":subsurface-icon"));
 
+#ifdef USE_WEBENGINE
+	userManual = new MyQWebEngineView(this);
+	MyQWebEnginePage *page = new MyQWebEnginePage();
+	userManual->setPage(page);
+#else
 	userManual = new QWebView(this);
+	userManual->page()->setLinkDelegationPolicy(QWebPage::DelegateExternalLinks);
+#endif
+
 	QString colorBack = palette().highlight().color().name(QColor::HexRgb);
 	QString colorText = palette().highlightedText().color().name(QColor::HexRgb);
 	userManual->setStyleSheet(QString("QWebView { selection-background-color: %1; selection-color: %2; }")
 		.arg(colorBack).arg(colorText));
-	userManual->page()->setLinkDelegationPolicy(QWebPage::DelegateExternalLinks);
 	QString searchPath = getSubsurfaceDataPath("Documentation");
 	if (searchPath.size()) {
 		// look for localized versions of the manual first
@@ -85,7 +112,10 @@ UserManual::UserManual(QWidget *parent) : QDialog(parent)
 	searchBar->hide();
 	connect(actionShowSearch, SIGNAL(triggered(bool)), searchBar, SLOT(show()));
 	connect(actionHideSearch, SIGNAL(triggered(bool)), searchBar, SLOT(hide()));
+#ifndef USE_WEBENGINE
 	connect(userManual, SIGNAL(linkClicked(QUrl)), this, SLOT(linkClickedSlot(QUrl)));
+#endif
+
 	connect(searchBar, SIGNAL(searchTextChanged(QString)), this, SLOT(searchTextChanged(QString)));
 	connect(searchBar, SIGNAL(searchNext()), this, SLOT(searchNext()));
 	connect(searchBar, SIGNAL(searchPrev()), this, SLOT(searchPrev()));
@@ -97,6 +127,14 @@ UserManual::UserManual(QWidget *parent) : QDialog(parent)
 	setLayout(vboxLayout);
 }
 
+#ifdef USE_WEBENGINE
+void UserManual::search(QString text, QWebEnginePage::FindFlags flags = QFlag(0))
+{
+	userManual->findText(text, flags,
+			     [this, text](bool found) {searchBar->setStyleSheet(found || text.length() == 0 ? "" : "QLineEdit{background: red;}");});
+}
+
+#else
 void UserManual::search(QString text, QWebPage::FindFlags flags = QFlag(0))
 {
 	if (userManual->findText(text, QWebPage::FindWrapsAroundDocument | flags) || text.length() == 0) {
@@ -105,6 +143,7 @@ void UserManual::search(QString text, QWebPage::FindFlags flags = QFlag(0))
 		searchBar->setStyleSheet("QLineEdit{background: red;}");
 	}
 }
+#endif
 
 void UserManual::searchTextChanged(const QString& text)
 {
@@ -119,13 +158,21 @@ void UserManual::searchNext()
 
 void UserManual::searchPrev()
 {
+#ifdef USE_WEBENGINE
+	search(mLastText, QWebEnginePage::FindBackward);
+#else
 	search(mLastText, QWebPage::FindBackward);
+#endif
 }
 
+
+#ifndef USE_WEBENGINE
 void UserManual::linkClickedSlot(const QUrl& url)
 {
 	QDesktopServices::openUrl(url);
 }
+#endif
+
 
 #ifdef Q_OS_MAC
 void UserManual::showEvent(QShowEvent *e)

desktop-widgets/usermanual.h

@@ -2,7 +2,13 @@
 #ifndef USERMANUAL_H
 #define USERMANUAL_H
 
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#include <QWebEnginePage>
+#else
 #include <QWebView>
+#endif
+
 #include <QDialog>
 #include "ui_searchbar.h"
 
@@ -22,6 +28,26 @@ private:
 	Ui::SearchBar ui;
 };
 
+#ifdef USE_WEBENGINE
+class MyQWebEnginePage : public QWebEnginePage
+{
+	Q_OBJECT
+
+public:
+	MyQWebEnginePage(QObject* parent = 0);
+	bool acceptNavigationRequest(const QUrl & url, QWebEnginePage::NavigationType type, bool);
+};
+
+class MyQWebEngineView : public QWebEngineView
+{
+	Q_OBJECT
+
+public:
+	MyQWebEngineView(QWidget* parent = 0);
+	MyQWebEnginePage* page() const;
+};
+#endif
+
 class UserManual : public QDialog {
 	Q_OBJECT
 
@@ -41,11 +67,19 @@ slots:
 	void searchTextChanged(const QString& s);
 	void searchNext();
 	void searchPrev();
+#ifndef USE_WEBENGINE
 	void linkClickedSlot(const QUrl& url);
+#endif
 private:
 	SearchBar *searchBar;
 	QString mLastText;
+#ifdef USE_WEBENGINE
+	QWebEngineView *userManual;
+	void search(QString, QWebEnginePage::FindFlags);
+#else
 	QWebView *userManual;
 	void search(QString, QWebPage::FindFlags);
+#endif
 };
+
 #endif // USERMANUAL_H

scripts/build.sh

@@ -84,6 +84,12 @@ while [[ $# -gt 0 ]] ; do
 			shift
 			BUILD_PREFIX="$1"
 			;;
+		-print-with-webengine)
+			# WebKit is no longer supported in Qt 6
+			# WebEngine doesn't build with our tools on Windows
+			# so allow to switch printing between the two flavors
+			BUILD_WITH_WEBENGINE="1"
+			;;
 		-build-with-webkit)
 			# unless you build Qt from source (or at least webkit from source, you won't have webkit installed
 			# -build-with-webkit tells the script that in fact we can assume that webkit is present (it usually
@@ -126,7 +132,7 @@ while [[ $# -gt 0 ]] ; do
 			;;
 		*)
 			echo "Unknown command line argument $arg"
-			echo "Usage: build.sh [-no-bt] [-quick] [-build-deps] [-src-dir <SUBSURFACE directory>] [-build-prefix <PREFIX>] [-build-with-webkit] [-mobile] [-desktop] [-downloader] [-both] [-all] [-create-appdir] [-release]"
+			echo "Usage: build.sh [-no-bt] [-quick] [-build-deps] [-src-dir <SUBSURFACE directory>] [-build-prefix <PREFIX>] [-print-with-webengine] [-build-with-webkit] [-mobile] [-desktop] [-downloader] [-both] [-all] [-create-appdir] [-release]"
 			exit 1
 			;;
 	esac
@@ -540,6 +546,11 @@ for (( i=0 ; i < ${#BUILDS[@]} ; i++ )) ; do
 	else
 		EXTRA_OPTS="-DNO_USERMANUAL=ON -DNO_PRINTING=ON"
 	fi
+	if [ "$SUBSURFACE_EXECUTABLE" = "DesktopExecutable" ] && [ "$BUILD_WITH_WEBENGINE" = "1" ]; then
+		# if we build with QtWebKit as well then this is a bit redundant, but at least
+		# it's not wrong
+		EXTRA_OPTS="-DNO_USERMANUAL=OFF -DNO_PRINTING=OFF -DUSE_WEBENGINE=ON"
+	fi
 
 	cd "$SRC"/${SRC_DIR}
 

scripts/smtk2ssrf-build.sh

@@ -146,6 +146,7 @@ cmake   -DBTSUPPORT=OFF \
 	-DMAKE_TESTS=OFF \
 	-DNO_DOCS=ON \
 	-DNO_PRINTING=ON \
+	-DUSE_WEBENGINE=OFF \
 	-DNO_USERMANUAL=ON \
 	-DSUBSURFACE_TARGET_EXECUTABLE=DesktopExecutable \
 	build