From bfbdb5af4b60a1e21a4c8b04f25bdb3ce2cc75f0 Mon Sep 17 00:00:00 2001
From: Andreas Suter <andreas.suter@psi.ch>
Date: Tue, 11 Apr 2017 10:38:08 +0200
Subject: [PATCH] allow both QtWebKit and QtWebEngine since a lot of distros
 are not ready yet for QtWebEngine.

---
 src/musredit_qt5/musredit/PHelp.cpp    | 15 +++++++++++++++
 src/musredit_qt5/musredit/PHelp.h      |  8 ++++++++
 src/musredit_qt5/musredit/musredit.pro | 20 +++++++++++++++++++-
 3 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/musredit_qt5/musredit/PHelp.cpp b/src/musredit_qt5/musredit/PHelp.cpp
index 5d261f41..092925af 100644
--- a/src/musredit_qt5/musredit/PHelp.cpp
+++ b/src/musredit_qt5/musredit/PHelp.cpp
@@ -28,7 +28,11 @@
  ***************************************************************************/
 
 #include <QtWidgets>
+#ifdef HAVE_QT_WEB_ENGINE
 #include <QWebEngineView>
+#else
+#include <QtWebKitWidgets>
+#endif
 #include <QNetworkProxyFactory>
 
 #include <QtDebug>
@@ -55,7 +59,11 @@ PHelp::PHelp(const QString &url, const bool isDarkTheme) :
 
   QNetworkProxyFactory::setUseSystemConfiguration(true);
 
+#ifdef HAVE_QT_WEB_ENGINE
   fView = new QWebEngineView(this);
+#else
+  fView = new QWebView(this);
+#endif
   fView->load(QUrl(url));
   connect(fView, SIGNAL(loadFinished(bool)), SLOT(adjustLocation()));
   connect(fView, SIGNAL(titleChanged(QString)), SLOT(adjustTitle()));
@@ -67,10 +75,17 @@ PHelp::PHelp(const QString &url, const bool isDarkTheme) :
   connect(fLocationEdit, SIGNAL(returnPressed()), SLOT(changeLocation()));
 
   QToolBar *toolBar = addToolBar(tr("Navigation"));
+#ifdef HAVE_QT_WEB_ENGINE
   toolBar->addAction(fView->pageAction(QWebEnginePage::Back));
   toolBar->addAction(fView->pageAction(QWebEnginePage::Forward));
   toolBar->addAction(fView->pageAction(QWebEnginePage::Reload));
   toolBar->addAction(fView->pageAction(QWebEnginePage::Stop));
+#else
+  toolBar->addAction(fView->pageAction(QWebPage::Back));
+  toolBar->addAction(fView->pageAction(QWebPage::Forward));
+  toolBar->addAction(fView->pageAction(QWebPage::Reload));
+  toolBar->addAction(fView->pageAction(QWebPage::Stop));
+#endif
   toolBar->addWidget(fLocationEdit);
 
   QMenu *exitMenu = menuBar()->addMenu(tr("&File"));
diff --git a/src/musredit_qt5/musredit/PHelp.h b/src/musredit_qt5/musredit/PHelp.h
index b2335009..5b1f7b70 100644
--- a/src/musredit_qt5/musredit/PHelp.h
+++ b/src/musredit_qt5/musredit/PHelp.h
@@ -32,7 +32,11 @@
 
 #include <QtWidgets>
 
+#ifdef HAVE_QT_WEB_ENGINE
 class QWebEngineView;
+#else
+class QWebView;
+#endif
 QT_BEGIN_NAMESPACE
 class QLineEdit;
 QT_END_NAMESPACE
@@ -60,7 +64,11 @@ class PHelp : public QMainWindow
 
   private:
     bool fDarkTheme;
+#ifdef HAVE_QT_WEB_ENGINE
     QWebEngineView *fView; ///< web viewer
+#else
+    QWebView *fView; ///< web viewer
+#endif
     QLineEdit *fLocationEdit; ///< url address line edit
     int fProgress; ///< progress value (0-100) while loading an url
 };
diff --git a/src/musredit_qt5/musredit/musredit.pro b/src/musredit_qt5/musredit/musredit.pro
index 3650eb2a..ba2f3e95 100644
--- a/src/musredit_qt5/musredit/musredit.pro
+++ b/src/musredit_qt5/musredit/musredit.pro
@@ -1,6 +1,19 @@
 TEMPLATE = app
 TARGET = musredit
 
+packagesExist(Qt5WebEngine) {
+  message("Qt5WebEngine found")
+  DEFINES += HAVE_QT_WEB_ENGINE
+  HAVE_QT_WEB_ENGINE = 1
+}
+packagesExist(QtWebKit) {
+  message("QtWebKit found")
+  HAVE_QT_WEB_ENGINE = 0   
+}
+isEmpty(HAVE_QT_WEB_ENGINE) {
+  message("Neither QtWebKit nor Qt5WebEngine found. Something is wrong, please check")
+}
+
 QMAKE_CXXFLAGS += -std=c++11
 
 # install path for musredit
@@ -71,7 +84,12 @@ CONFIG += qt \
 
 QT += widgets
 QT += xml
-QT += webenginewidgets
+isEqual(HAVE_QT_WEB_ENGINE, 1) {
+  QT += webenginewidgets
+}
+isEqual(HAVE_QT_WEB_ENGINE, 0) {
+  QT += webkitwidgets
+}
 QT += network
 QT += printsupport
 QT += svg