Start transition from QWebKit to QWebEngine

This removes all references to WebKit if cmake option USE_WEBKIT is enabled.
For the user manual it changes it to WebEngine (seems to work for me).

Similar for the Facebook connection (minus a reference to a cookie jar).
This I could not test at the moment, as I wrote this on a train.

Printing does not work, it is a null operation at the moment. Currently,
large parts of of the printing code are commented out as there is no direct
way to access page elements in WebEngine. It seems this needs to be done
via Javascript (with a callback invoked). There is new functionality in
WebEngine to render a view to a PDF file but this needs more work (and
probably some thoughts towards page breaks).

Signed-off-by: Robert C. Helling <helling@atdotde.de>

8 files changed, 159 insertions, 7 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bbe5516c0..991eabaf5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,6 +33,7 @@ option(NO_USERMANUAL "don't include a viewer for the user manual" OFF)
 option(FBSUPPORT "allow posting to Facebook" ON)
 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)
diff --git a/cmake/Modules/HandleUserManual.cmake b/cmake/Modules/HandleUserManual.cmake
index 6e4874c60..a9354be2b 100644
--- a/cmake/Modules/HandleUserManual.cmake
+++ b/cmake/Modules/HandleUserManual.cmake
@@ -2,6 +2,13 @@ if(NO_USERMANUAL)
 	message(STATUS "building without usermanual")
 	add_definitions(-DNO_USERMANUAL)
 else()
-	list(APPEND QT_EXTRA_COMPONENTS WebKitWidgets)
-	list(APPEND QT_EXTRA_LIBRARIES Qt5::WebKitWidgets)
+	if(USE_WEBENGINE)
+		message(STATUS "building with QWebEngine")
+		list(APPEND QT_EXTRA_COMPONENTS WebEngineWidgets)
+		list(APPEND QT_EXTRA_LIBRARIES Qt5::WebEngineWidgets)
+		add_definitions(-DUSE_WEBENGINE)
+	else()
+		list(APPEND QT_EXTRA_COMPONENTS WebKitWidgets)
+		list(APPEND QT_EXTRA_LIBRARIES Qt5::WebKitWidgets)
+	endif()
 endif()
diff --git a/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp b/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp
index e0d2aab67..40d598229 100644
--- a/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp
+++ b/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp
@@ -16,8 +16,11 @@
 #include <QDebug>
 #include <QMessageBox>
 #include <QInputDialog>
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#else
 #include <QWebView>
-
+#endif
 #include "mainwindow.h"
 #include "profile-widget/profilewidget2.h"
 
@@ -224,14 +227,22 @@ void FacebookManager::sendDive()
 FacebookConnectWidget::FacebookConnectWidget(QWidget *parent) : QDialog(parent), ui(new Ui::FacebookConnectWidget) {
 	ui->setupUi(this);
 	FacebookManager *fb = FacebookManager::instance();
+#ifdef USE_WEBENGINE
+	facebookWebView = new QWebEngineView(this);
+#else
 	facebookWebView = new QWebView(this);
+#endif
 	ui->fbWebviewContainer->layout()->addWidget(facebookWebView);
 	if (fb->loggedIn()) {
 		facebookLoggedIn();
 	} else {
 		facebookDisconnect();
 	}
+#ifdef USE_WEBENGINE
+	connect(facebookWebView, &QWebEngineView::urlChanged, fb, &FacebookManager::tryLogin);
+#else
 	connect(facebookWebView, &QWebView::urlChanged, fb, &FacebookManager::tryLogin);
+#endif
 	connect(fb, &FacebookManager::justLoggedIn, this, &FacebookConnectWidget::facebookLoggedIn);
 }
 
@@ -250,7 +261,11 @@ void FacebookConnectWidget::facebookDisconnect()
 	ui->fbWebviewContainer->setEnabled(true);
 	ui->FBLabel->setText(tr("To connect to Facebook, please log in. This enables Subsurface to publish dives to your timeline"));
 	if (facebookWebView) {
+#ifdef USE_WEBENGINE
+	//FIX ME
+#else
 		facebookWebView->page()->networkAccessManager()->setCookieJar(new QNetworkCookieJar());
+#endif
 		facebookWebView->setUrl(FacebookManager::instance()->connectUrl());
 	}
 }
diff --git a/desktop-widgets/plugins/facebook/facebookconnectwidget.h b/desktop-widgets/plugins/facebook/facebookconnectwidget.h
index e97097806..8fbf249e2 100644
--- a/desktop-widgets/plugins/facebook/facebookconnectwidget.h
+++ b/desktop-widgets/plugins/facebook/facebookconnectwidget.h
@@ -2,7 +2,11 @@
 #define FACEBOOKCONNECTWIDGET_H
 
 #include <QDialog>
+#ifdef USE_WEBENGINE
+class QWebEngineView;
+#else
 class QWebView;
+#endif
 namespace Ui {
   class FacebookConnectWidget;
   class SocialnetworksDialog;
@@ -41,7 +45,11 @@ public:
 	void facebookDisconnect();
 private:
 	Ui::FacebookConnectWidget *ui;
+#ifdef USE_WEBENGINE
+	QWebEngineView *facebookWebView;
+#else
 	QWebView *facebookWebView;
+#endif
 };
 
 class SocialNetworkDialog : public QDialog {
diff --git a/desktop-widgets/printer.cpp b/desktop-widgets/printer.cpp
index eea304347..bad1c2760 100644
--- a/desktop-widgets/printer.cpp
+++ b/desktop-widgets/printer.cpp
@@ -4,10 +4,14 @@
 #include "core/helpers.h"
 
 #include <algorithm>
-#include <QtWebKitWidgets>
 #include <QPainter>
+#ifdef USE_WEBENGINE
+#include <QtWebEngineWidgets>
+#else
+#include <QtWebKitWidgets>
 #include <QWebElementCollection>
 #include <QWebElement>
+#endif
 #include "profile-widget/profilewidget2.h"
 
 Printer::Printer(QPaintDevice *paintDevice, print_options *printOptions, template_options *templateOptions,  PrintMode printMode)
@@ -18,7 +22,11 @@ Printer::Printer(QPaintDevice *paintDevice, print_options *printOptions, templat
 	this->printMode = printMode;
 	dpi = 0;
 	done = 0;
+#ifdef USE_WEBENGINE
+	webView = new QWebEngineView();
+#else
 	webView = new QWebView();
+#endif
 }
 
 Printer::~Printer()
@@ -61,6 +69,7 @@ void Printer::putProfileImage(QRect profilePlaceholder, QRect viewPort, QPainter
 void Printer::flowRender()
 {
 	// add extra padding at the bottom to pages with height not divisible by view port
+#ifndef USE_WEBENGINE
 	int paddingBottom = pageSize.height() - (webView->page()->mainFrame()->contentsSize().height() % pageSize.height());
 	QString styleString = QString::fromUtf8("padding-bottom: ") + QString::number(paddingBottom) + "px;";
 	webView->page()->mainFrame()->findFirstElement("body").setAttribute("style", styleString);
@@ -115,6 +124,9 @@ void Printer::flowRender()
 	webView->page()->mainFrame()->render(&painter, QWebFrame::ContentsLayer, reigon);
 
 	painter.end();
+#else
+	// FIX ME
+#endif
 }
 
 void Printer::render(int Pages = 0)
@@ -140,6 +152,9 @@ void Printer::render(int Pages = 0)
 	painter.setRenderHint(QPainter::SmoothPixmapTransform);
 
 	// get all refereces to diveprofile class in the Html template
+#ifdef USE_WEBENGINE
+	//FIX ME
+#else
 	QWebElementCollection collection = webView->page()->mainFrame()->findAllElements(".diveprofile");
 
 	QSize originalSize = profile->size();
@@ -173,13 +188,18 @@ void Printer::render(int Pages = 0)
 			static_cast<QPrinter*>(paintDevice)->newPage();
 	}
 	painter.end();
+#endif
 
 	// return profle settings
 	profile->setFrameStyle(profileFrameStyle);
 	profile->setPrintMode(false);
 	profile->setFontPrintScale(fontScale);
 	profile->setToolTipVisibile(true);
+#ifdef USE_WEBENGINE
+	//FIXME
+#else
 	profile->resize(originalSize);
+#endif
 	prefs.animation_speed = animationOriginal;
 
 	//replot the dive after returning the settings
@@ -210,8 +230,12 @@ void Printer::print()
 	//rendering resolution = selected paper size in inchs * printer dpi
 	pageSize.setHeight(qCeil(printerPtr->pageRect(QPrinter::Inch).height() * dpi));
 	pageSize.setWidth(qCeil(printerPtr->pageRect(QPrinter::Inch).width() * dpi));
+#ifdef USE_WEBENGINE
+	//FIXME
+#else
 	webView->page()->setViewportSize(pageSize);
 	webView->page()->mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
+#endif
 	// export border width with at least 1 pixel
 	templateOptions->border_width = std::max(1, pageSize.width() / 1000);
 	if (printOptions->type == print_options::DIVELIST) {
@@ -229,11 +253,15 @@ void Printer::print()
 
 	// get number of dives per page from data-numberofdives attribute in the body of the selected template
 	bool ok;
+#ifdef USE_WEBENGINE
+	// FIX ME
+#else
 	divesPerPage = webView->page()->mainFrame()->findFirstElement("body").attribute("data-numberofdives").toInt(&ok);
 	if (!ok) {
 		divesPerPage = 1; // print each dive in a single page if the attribute is missing or malformed
 		//TODO: show warning
 	}
+#endif
 	int Pages;
 	if (divesPerPage == 0) {
 		flowRender();
@@ -250,7 +278,11 @@ void Printer::previewOnePage()
 
 		pageSize.setHeight(paintDevice->height());
 		pageSize.setWidth(paintDevice->width());
+#ifdef USE_WEBENGINE
+		//FIXME
+#else
 		webView->page()->setViewportSize(pageSize);
+#endif
 		// initialize the border settings
 		templateOptions->border_width = std::max(1, pageSize.width() / 1000);
 		if (printOptions->type == print_options::DIVELIST) {
@@ -258,7 +290,10 @@ void Printer::previewOnePage()
 		} else if (printOptions->type == print_options::STATISTICS ) {
 			webView->setHtml(t.generateStatistics());
 		}
-
+#ifdef USE_WEBENGINE
+		// FIX ME
+		render(1);
+#else
 		bool ok;
 		int divesPerPage = webView->page()->mainFrame()->findFirstElement("body").attribute("data-numberofdives").toInt(&ok);
 		if (!ok) {
@@ -270,5 +305,6 @@ void Printer::previewOnePage()
 		} else {
 			render(1);
 		}
+#endif
 	}
 }
diff --git a/desktop-widgets/printer.h b/desktop-widgets/printer.h
index e5f16d77d..fc867bb3c 100644
--- a/desktop-widgets/printer.h
+++ b/desktop-widgets/printer.h
@@ -2,7 +2,11 @@
 #define PRINTER_H
 
 #include <QPrinter>
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#else
 #include <QWebView>
+#endif
 #include <QRect>
 #include <QPainter>
 
@@ -20,7 +24,11 @@ public:
 
 private:
 	QPaintDevice *paintDevice;
+#ifdef USE_WEBENGINE
+	QWebEngineView *webView;
+#else
 	QWebView *webView;
+#endif
 	print_options *printOptions;
 	template_options *templateOptions;
 	QSize pageSize;
diff --git a/desktop-widgets/usermanual.cpp b/desktop-widgets/usermanual.cpp
index 690307961..8e75b432f 100644
--- a/desktop-widgets/usermanual.cpp
+++ b/desktop-widgets/usermanual.cpp
@@ -34,6 +34,27 @@ 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) : QWidget(parent)
 {
 	QShortcut *closeKey = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this);
@@ -54,12 +75,20 @@ UserManual::UserManual(QWidget *parent) : QWidget(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);
+#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));
+#ifndef USE_WEBENGINE
 	userManual->page()->setLinkDelegationPolicy(QWebPage::DelegateExternalLinks);
+#endif
 	QString searchPath = getSubsurfaceDataPath("Documentation");
 	if (searchPath.size()) {
 		// look for localized versions of the manual first
@@ -84,7 +113,9 @@ UserManual::UserManual(QWidget *parent) : QWidget(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()));
@@ -96,6 +127,13 @@ UserManual::UserManual(QWidget *parent) : QWidget(parent)
 	setLayout(vboxLayout);
 }
 
+#ifdef USE_WEBENGINE
+void UserManual::search(QString text, QWebEnginePage::FindFlags flags = 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 = 0)
 {
 	if (userManual->findText(text, QWebPage::FindWrapsAroundDocument | flags) || text.length() == 0) {
@@ -104,6 +142,7 @@ void UserManual::search(QString text, QWebPage::FindFlags flags = 0)
 		searchBar->setStyleSheet("QLineEdit{background: red;}");
 	}
 }
+#endif
 
 void UserManual::searchTextChanged(const QString& text)
 {
@@ -118,13 +157,19 @@ 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) {
diff --git a/desktop-widgets/usermanual.h b/desktop-widgets/usermanual.h
index 5101a3c3b..04ae15605 100644
--- a/desktop-widgets/usermanual.h
+++ b/desktop-widgets/usermanual.h
@@ -1,8 +1,12 @@
 #ifndef USERMANUAL_H
 #define USERMANUAL_H
 
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#include <QWebEnginePage>
+#else
 #include <QWebView>
-
+#endif
 #include "ui_searchbar.h"
 
 class SearchBar : public QWidget{
@@ -21,6 +25,27 @@ 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 QWidget {
 	Q_OBJECT
 
@@ -40,11 +65,18 @@ slots:
 	void searchTextChanged(const QString& s);
 	void searchNext();
 	void searchPrev();
+#ifndef USE_WEBENGINE
 	void linkClickedSlot(const QUrl& url);
+#endif
 private:
-	QWebView *userManual;
 	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