Man page 3 : XkbNoteIndicatorChanges

XkbNoteIndicatorChanges - Notes the changes in a changes structure

void XkbNoteIndicatorChanges (XkbIndicatorChangesPtr old , XkbIndicatorNotifyEvent * new , unsigned int wanted );

• - old
      XkbIndicatorChanges structure to be updated
• - new
      event from which changes are to be copied
• - wanted
      which changes are to be noted

Whenever an indicator changes state, the server sends XkbIndicatorStateNotify events to all interested clients. Similarly, whenever an indicator's map changes, the server sends XkbIndicatorMapNotify events to all interested clients. To receive XkbIndicatorStateNotify events, use XkbSelectEventswith both the bits_to_changeand values_for_bitsparameters containing XkbIndicatorStateNotifyMask. To receive XkbIndicatorMapNotify events, use XkbSelectEventswith XkbIndicatorMapNotifyMask. To receive events for only specific indicators, use XkbSelectEventDetails.Set the event_typeparameter to XkbIndicatorStateNotify or XkbIndicatorMapNotify, and set both the bits_to_changeand values_for_bitsdetail parameters to a mask where each bit specifies one indicator, turning on those bits that specify the indicators for which you want to receive events. The changedparameter is a mask that is the bitwise inclusive OR of the indicators that have changed. If the event is of type XkbIndicatorMapNotify, changedreports the maps that changed. If the event is of type XkbIndicatorStateNotify, changedreports the indicators that have changed state. stateis a mask that specifies the current state of all indicators, whether they have changed or not, for both XkbIndicatorStateNotify and IndicatorMapNotify events. When your client application receives either a XkbIndicatorStateNotify event or XkbIndicatorMapNotify event, you can note the changes in a changes structure by calling XkbNoteIndicatorChanges. The wantedparameter is the bitwise inclusive OR of XkbIndicatorMapMask and XkbIndicatorStateMask. XkbNoteIndicatorChangescopies any changes reported in newand specified in wantedinto the changes record specified by old.

Both types of indicator events use the same structure:

typedef struct _XkbIndicatorNotify {
  int            type;       /(** Xkb extension base event code */
  unsigned long  serial;     /(** X server serial number for event */
  Bool           send_event; /(** True => synthetically generated */
  Display *      display;    /(** server connection where event generated */
  Time           time;       /(** server time when event generated */
  int            xkb_type;   /(** specifies state or map notify */
  int            device;     /(** Xkb device ID, will not be XkbUseCoreKbd */
  unsigned int   changed;    /(** mask of indicators with new state or map */
  unsigned int   state;      /(** current state of all indicators */
} XkbIndicatorNotifyEvent;

xkb_typeis either XkbIndicatorStateNotify or XkbIndicatorMapNotify, depending on whether the event is a kbIndicatorStateNotify event or kbIndicatorMapNotify event.

R XkbIndicatorMapMask (3),

R XkbIndicatorStateMask (3),

R XkbSelectEventDetails (3),

R XkbSelectEvents (3)