tdf#158556 avoid dynamic_cast

reduces load time by 2%

Change-Id: I8b31257baacd49657cccf7cc6bd04408581803c7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172102
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/svl/lstner.hxx

@@ -71,6 +71,8 @@ public:
 
     /// Used to avoid cost of dynamic_cast in SdrViewIter::ImpFindView
     virtual bool        IsSdrView() const { return false; }
+    /// Used to avoid cost of dynamic_cast in SwXStyleFamily::FindStyle
+    virtual bool        IsSwXStyle() const { return false; }
 };
 
 #endif

sw/inc/unoxstyle.hxx

@@ -171,6 +171,9 @@ public:
     virtual void Notify(SfxBroadcaster& rBC, const SfxHint& rHint) override;
     //SvtListener
     virtual void Notify(const SfxHint&) override;
+    //SfxListener
+    /// Used to avoid cost of dynamic_cast in SwXStyleFamily::FindStyle
+    virtual bool IsSwXStyle() const override final { return true; }
 
     SW_DLLPUBLIC rtl::Reference<SwXNumberingRules> getNumberingRules();
 

sw/source/core/unocore/unostyle.cxx

@@ -1190,7 +1190,9 @@ SwXStyle* SwXStyleFamily::FindStyle(std::u16string_view rStyleName) const
     m_pBasePool->ForAllListeners(
         [this, &pFoundStyle, &rStyleName] (SfxListener* pListener)
         {
-            SwXStyle* pTempStyle = dynamic_cast<SwXStyle*>(pListener);
+            if (!pListener->IsSwXStyle())
+                return false;
+            SwXStyle* pTempStyle = static_cast<SwXStyle*>(pListener);
             if(pTempStyle && pTempStyle->GetFamily() == m_rEntry.family() && pTempStyle->GetStyleName() == rStyleName)
             {
                 pFoundStyle = pTempStyle;