Listing 2. Macros
#define EnterWindowMask GR_EVENT_MASK_MOUSE_ENTER
#define LeaveWindowMask GR_EVENT_MASK_MOUSE_EXIT
#define ButtonPressMask GR_EVENT_MASK_BUTTON_DOWN
#define ButtonReleaseMask GR_EVENT_MASK_BUTTON_UP
#define KeyPressMask GR_EVENT_MASK_KEY_DOWN
#define KeyReleaseMask GR_EVENT_MASK_KEY_UP
#define ExposureMask GR_EVENT_MASK_EXPOSURE
#define SubstructureNotifyMask
#define EnterNotify GR_EVENT_TYPE_MOUSE_ENTER
#define LeaveNotify GR_EVENT_TYPE_MOUSE_EXIT
#define ButtonPress GR_EVENT_TYPE_BUTTON_DOWN
#define ButtonRelease GR_EVENT_TYPE_BUTTON_UP
#define KeyPress GR_EVENT_TYPE_KEY_DOWN
#define KeyRelease GR_EVENT_TYPE_KEY_UP
#define Expose GR_EVENT_TYPE_EXPOSURE
#define ConfigureNotify GR_EVENT_TYPE_CHLD_UPDATE