Make links, images, gifs working

src/panelplugins/documentationpanel/documentationpanelwidget.cpp

@@ -37,12 +37,15 @@
 #include <QSplitter>
 #include <QStandardPaths>
 #include <QTabWidget>
+#include <QWebEngineProfile>
+#include <QWebEngineUrlScheme>
 #include <QWebEngineView>
 
 DocumentationPanelWidget::DocumentationPanelWidget(Cantor::Session* session, QWidget* parent) :QWidget(parent), m_backend(QString())
 {
     m_backend = session->backend()->name();
     const QString fileName = QStandardPaths::locate(QStandardPaths::AppDataLocation, QLatin1String("documentation/") + m_backend + QLatin1String("/help.qhc"));
+
     m_engine = new QHelpEngine(fileName, this);
 
     if(!m_engine->setupData())
@@ -73,20 +76,20 @@ DocumentationPanelWidget::DocumentationPanelWidget(Cantor::Session* session, QWi
     tabWidget->addTab(container, i18n("Search"));
 
     m_textBrowser = new QWebEngineView(this);
+    QWebEngineUrlScheme qthelp("qthelp");
+    QWebEngineUrlScheme::registerScheme(qthelp);
+    m_textBrowser->page()->profile()->installUrlSchemeHandler("qthelp", new QtHelpSchemeHandler(m_engine));
 
     // set initial page contents, otherwise page is blank
-    QByteArray contents;
-
     if(m_backend == QLatin1String("Maxima"))
     {
-        contents = m_engine->fileData(QUrl(QLatin1String("qthelp://org.kde.cantor/doc/maxima.html#SEC_Top")));
+        m_textBrowser->load(QUrl(QLatin1String("qthelp://org.kde.cantor/doc/maxima.html#SEC_Top")));
     }
     else if(m_backend == QLatin1String("Octave"))
     {
-        contents = m_engine->fileData(QUrl(QLatin1String("qthelp://org.octave.interpreter-1.0/doc/octave.html/index.html")));
+        m_textBrowser->load(QUrl(QLatin1String("qthelp://org.octave.interpreter-1.0/doc/octave.html/index.html")));
     }
 
-    m_textBrowser->setContent(contents, QLatin1String("text/html;charset=UTF-8"));
     m_textBrowser->show();
 
     QSplitter* splitter = new QSplitter(Qt::Horizontal, this);
@@ -116,8 +119,7 @@ void DocumentationPanelWidget::setSession(Cantor::Session* session)
 
 void DocumentationPanelWidget::displayHelp(const QUrl& url)
 {
-    const QByteArray contents = m_engine->fileData(url);
-    m_textBrowser->setContent(contents, QLatin1String("text/html;charset=UTF-8"));
+    m_textBrowser->load(url);
     m_textBrowser->show();
 
     qDebug() << url;

src/panelplugins/documentationpanel/documentationpanelwidget.h

@@ -21,6 +21,10 @@
 #ifndef _DOCUMENTATIONPANELWIDGET_H
 #define _DOCUMENTATIONPANELWIDGET_H
 
+#include <QBuffer>
+#include <QHelpEngine>
+#include <QWebEngineUrlRequestJob>
+#include <QWebEngineUrlSchemeHandler>
 #include <QWidget>
 
 namespace Cantor{
@@ -60,4 +64,29 @@ class DocumentationPanelWidget : public QWidget
     QString m_backend;
 };
 
+// class for handling of custom url scheme ie. qthelp:// inside QWebEngineView
+class QtHelpSchemeHandler : public QWebEngineUrlSchemeHandler
+{
+    Q_OBJECT
+
+    public:
+    QtHelpSchemeHandler(QHelpEngine* helpEngine) : m_HelpEngine(helpEngine)
+    {
+    }
+
+    virtual void requestStarted(QWebEngineUrlRequestJob* job) override
+    {
+        auto url = job->requestUrl();
+        auto data = new QByteArray;
+        *data = m_HelpEngine->fileData(url);
+        auto buffer = new QBuffer(data);
+        if (url.scheme() == QLatin1String("qthelp")) {
+            job->reply("text/html", buffer);
+        }
+    }
+
+    private:
+    QHelpEngine* m_HelpEngine;
+};
+
 #endif /* _DOCUMENTATIONPANELWIDGET_H */