LOK: fire SET_PART event when Impress page is changed

Change-Id: Iebddffbdc66397b1f2937ed7320f7800c8bab4cc
Reviewed-on: https://gerrit.libreoffice.org/26301Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sd/source/ui/view/drviews1.cxx

@@ -81,6 +81,7 @@
 
 #include <sfx2/request.hxx>
 #include <comphelper/lok.hxx>
+#include <LibreOfficeKit/LibreOfficeKitEnums.h>
 
 using namespace com::sun::star;
 
@@ -924,6 +925,10 @@ bool DrawViewShell::SwitchPage(sal_uInt16 nSelectedPage)
         // never at a masterpage)
         GetDoc()->SetSelected(mpActualPage, true);
 
+        // notify LibreOfficeKit about changed page
+        OString aPayload = OString::number(nSelectedPage);
+        GetDoc()->libreOfficeKitCallback(LOK_CALLBACK_SET_PART, aPayload.getStr());
+
         rtl::Reference< sd::SlideShow > xSlideshow( SlideShow::GetSlideShow( GetDoc() ) );
         if( !xSlideshow.is() || !xSlideshow->isRunning() || ( xSlideshow->getAnimationMode() != ANIMATIONMODE_SHOW ) )
         {