Override this function to keep OnIdle from being called after specific messages are generated.

virtual BOOL IsIdleMessage( 
   MSG* pMsg  


Points to the current message being processed.

Nonzero if OnIdle should be called after processing message; otherwise 0.

The default implementation does not call OnIdle after redundant mouse messages and messages generated by blinking carets.

If an application has created a short timer, OnIdle will be called frequently, causing performance problems. To improve such an application's performance, override IsIdleMessage in the application's CWinApp-derived class to check for WM_TIMER messages as follows:

BOOL CMyWinApp::IsIdleMessage(MSG* pMsg)
   if (!CWinApp::IsIdleMessage(pMsg) || pMsg->message == WM_TIMER)
      return FALSE;
      return TRUE;

Handling WM_TIMER in this fashion will improve performance of applications that use short timers.

Header: afxwin.h