Annotation painting

PdfForQtLib/sources/pdfutils.h

@@ -28,6 +28,7 @@
 
 #include <vector>
 #include <iterator>
+#include <functional>
 
 namespace pdf
 {
@@ -76,6 +77,19 @@ public:
         return m_object;
     }
 
+    /// Returns the cached object. If object is dirty, then cached object is refreshed.
+    /// \param function Refresh function
+    inline const T& get(const std::function<T(void)>& function)
+    {
+        if (m_dirty)
+        {
+            m_object = function();
+            m_dirty = false;
+        }
+
+        return m_object;
+    }
+
     /// Invalidates the cached item, so it must be refreshed from the cache next time,
     /// if it is accessed.
     inline void dirty()