Support the PDF Print named action

Also stop casting directly from a poppler enum to an okular enum, it's
not cool

BUGS: 448791

core/action.h

@@ -279,8 +279,6 @@ class OKULARCORE_EXPORT DocumentAction : public Action
 public:
     /**
      * Describes the possible action types.
-     *
-     * WARNING KEEP IN SYNC WITH POPPLER!
      */
     enum DocumentActionType {
         PageFirst = 1,       ///< Jump to first page
@@ -294,7 +292,8 @@ public:
         EndPresentation = 9, ///< End presentation
         Find = 10,           ///< Open find dialog
         GoToPage = 11,       ///< Goto page
-        Close = 12           ///< Close document
+        Close = 12,          ///< Close document
+        Print = 13           ///< Print the document @since 22.04
     };
 
     /**

core/document.cpp

@@ -4004,6 +4004,9 @@ void Document::processAction(const Action *action)
         case DocumentAction::Close:
             emit close();
             break;
+        case DocumentAction::Print:
+            emit requestPrint();
+            break;
         }
     } break;
 

core/document.h

@@ -1111,6 +1111,13 @@ Q_SIGNALS:
      */
     void close();
 
+    /**
+     * This signal is emitted whenever an action requests a
+     * document print operation.
+     * @since 22.04
+     */
+    void requestPrint();
+
     /**
      * This signal is emitted whenever an action requests an
      * application quit operation.

generators/poppler/generator_pdf.cpp

@@ -338,6 +338,44 @@ QPair<Okular::Movie *, Okular::EmbeddedFile *> createMovieFromPopplerRichMedia(c
     return qMakePair(movie, pdfEmbeddedFile);
 }
 
+static Okular::DocumentAction::DocumentActionType popplerToOkular(Poppler::LinkAction::ActionType pat)
+{
+    switch (pat) {
+    case Poppler::LinkAction::PageFirst:
+        return Okular::DocumentAction::PageFirst;
+    case Poppler::LinkAction::PagePrev:
+        return Okular::DocumentAction::PagePrev;
+    case Poppler::LinkAction::PageNext:
+        return Okular::DocumentAction::PageNext;
+    case Poppler::LinkAction::PageLast:
+        return Okular::DocumentAction::PageLast;
+    case Poppler::LinkAction::HistoryBack:
+        return Okular::DocumentAction::HistoryBack;
+    case Poppler::LinkAction::HistoryForward:
+        return Okular::DocumentAction::HistoryForward;
+    case Poppler::LinkAction::Quit:
+        return Okular::DocumentAction::Quit;
+    case Poppler::LinkAction::Presentation:
+        return Okular::DocumentAction::Presentation;
+    case Poppler::LinkAction::EndPresentation:
+        return Okular::DocumentAction::EndPresentation;
+    case Poppler::LinkAction::Find:
+        return Okular::DocumentAction::Find;
+    case Poppler::LinkAction::GoToPage:
+        return Okular::DocumentAction::GoToPage;
+    case Poppler::LinkAction::Close:
+        return Okular::DocumentAction::Close;
+    case Poppler::LinkAction::Print:
+        return Okular::DocumentAction::Print;
+    }
+
+    qWarning() << "Unsupported Poppler::LinkAction::ActionType" << pat;
+    // TODO When we can use C++17 make this function return an optional
+    //      for now it's not super important since at the time of writing
+    //      okular DocumentAction supports all that poppler ActionType supports
+    return Okular::DocumentAction::PageFirst;
+}
+
 /**
  * Note: the function will take ownership of the popplerLink object.
  */
@@ -385,7 +423,7 @@ Okular::Action *createLinkFromPopplerLink(const Poppler::Link *popplerLink, bool
 
     case Poppler::Link::Action:
         popplerLinkAction = static_cast<const Poppler::LinkAction *>(popplerLink);
-        link = new Okular::DocumentAction((Okular::DocumentAction::DocumentActionType)popplerLinkAction->actionType());
+        link = new Okular::DocumentAction(popplerToOkular(popplerLinkAction->actionType()));
         break;
 
     case Poppler::Link::Sound: {

part/part.cpp

@@ -359,6 +359,7 @@ Part::Part(QWidget *parentWidget, QObject *parent, const QVariantList &args)
     connect(m_document, &Document::openUrl, this, &Part::openUrlFromDocument);
     connect(m_document->bookmarkManager(), &BookmarkManager::openUrl, this, &Part::openUrlFromBookmarks);
     connect(m_document, &Document::close, this, &Part::close);
+    connect(m_document, &Document::requestPrint, this, &Part::slotPrint);
     connect(m_document, &Document::undoHistoryCleanChanged, this, [this](bool clean) {
         setModified(!clean);
         setWindowTitleFromDocument();