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I’m using the following snippet in my mouseMoved-Event to handle the switching between the windows os mouse cursor and the cegui mouse cursor when entering/leaving the RenderWindow.

      if (mMouseInWindow)
      {
        CEGUI::System::getSingleton().injectMousePosition( arg.state.X.abs, arg.state.Y.abs );
        if (arg.state.X.abs == 0 || arg.state.Y.abs == 0 ||
            arg.state.X.abs == mWindowMaxWidth || arg.state.Y.abs == mWindowMaxHeight)
        {
          CEGUI::MouseCursor::getSingleton().hide();
          ShowCursor(true); // windows only
          mMouseInWindow = false;
        }
      }
      else if (arg.state.X.abs > 0 && arg.state.Y.abs > 0 &&
        arg.state.X.abs < mWindowMaxWidth && arg.state.Y.abs < mWindowMaxHeight)
      {
        CEGUI::MouseCursor::getSingleton().show();
        ShowCursor(false); // windows only
        mMouseInWindow = true;
      }

Filed under: CEGUI, OIS on Januar 18th, 2009