X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e0da9e871a3184daa1a32bcacbfdf6ddb9ed7db4..2a45803fc3877afd0ae3ce356dfe216505165882:/include/wx/private/textmeasure.h

diff --git a/include/wx/private/textmeasure.h b/include/wx/private/textmeasure.h
index 4788c992ed..393946e7bf 100644
--- a/include/wx/private/textmeasure.h
+++ b/include/wx/private/textmeasure.h
@@ -75,6 +75,9 @@ public:
     virtual void BeginMeasuring() { }
     virtual void EndMeasuring() { }
 
+    // This is another method which is only used by MeasuringGuard.
+    bool IsUsingDCImpl() const { return m_useDCImpl; }
+
 protected:
     // RAII wrapper for the two methods above.
     class MeasuringGuard
@@ -82,12 +85,16 @@ protected:
     public:
         MeasuringGuard(wxTextMeasureBase& tm) : m_tm(tm)
         {
-            m_tm.BeginMeasuring();
+            // BeginMeasuring() should only be called if we have a native DC,
+            // so don't call it if we delegate to a DC of unknown type.
+            if ( !m_tm.IsUsingDCImpl() )
+                m_tm.BeginMeasuring();
         }
 
         ~MeasuringGuard()
         {
-            m_tm.EndMeasuring();
+            if ( !m_tm.IsUsingDCImpl() )
+                m_tm.EndMeasuring();
         }
 
     private: