layout/base/PaintTracker.h

   1 #ifndef mozilla_PaintTracker_h
   2 #define mozilla_PaintTracker_h
   3
   4 #include "nscore.h"
   5 #include "nsDebug.h"
   6
   7 namespace mozilla {
   8
   9 class NS_STACK_CLASS PaintTracker
  10 {
  11 public:
  12   PaintTracker() {
  13     ++gPaintTracker;
  14   }
  15   ~PaintTracker() {
  16     NS_ASSERTION(gPaintTracker > 0, "Mismatched constructor/destructor");
  17     --gPaintTracker;
  18   }
  19
  20   static bool IsPainting() {
  21     return !!gPaintTracker;
  22   }
  23
  24 private:
  25   static int gPaintTracker;
  26 };
  27
  28 } // namespace mozilla
  29
  30 #endif // mozilla_PaintTracker_h