enum ETimingTrackViewportDirtyFlags { None = 0, HSizeChanged = (1 << 0), HPositionChanged = (1 << 1), HScaleChanged = (1 << 2), HClippedSessionTimeChanged = (1 << 3), HInvalidated = (1 << 4), VSizeChanged = (1 << 5), VPositionChanged = (1 << 6), VLayoutChanged = (1 << 7), VInvalidated = (1 << 8), AllHorizontal = HSizeChanged | HPositionChanged | HScaleChanged | HClippedSessionTimeChanged | HInvalidated, AllVertical = VSizeChanged | VPositionChanged | VLayoutChanged | VInvalidated, All = AllHorizontal | AllVertical, }