Manual Reference Pages  - XkbNoteDeviceChanges (3)


XkbNoteDeviceChanges - Note device changes reported in an XkbExtensionDeviceNotify event




void XkbNoteDeviceChanges (XkbDeviceChangesPtr old, XkbExtensionDeviceNotifyEvent *new, unsigned int wanted);    


- old structure tracking state changes
- new event indicating state changes
- wanted mask indicating changes to note


The wanted field specifies the changes that should be noted in old, and is composed of the bitwise inclusive OR of one or more of the masks from Table 1. The reason field of the event in new indicates the types of changes the event is reporting. XkbNoteDeviceChanges updates the XkbDeviceChangesRec specified by old with the changes that are both specified in wanted and contained in new->reason.

                         Table 1 XkbDeviceInfoRec Mask Bits                       
Name                         XkbDeviceInfoRec Value     Capability If Set
                             Fields Effected           
XkbXI_KeyboardsMask                           (1L <<0) Clients can use all
                                                       Xkb requests and events
                                                       with KeyClass devices
                                                       supported by the input
                                                       device extension.

XkbXI_ButtonActionsMask num_btns (1L <<1) Clients can assign key btn_acts actions to buttons non-KeyClass input extension devices. XkbXI_IndicatorNamesMask leds->names (1L <<2) Clients can assign names to indicators on non-KeyClass input extension devices. XkbXI_IndicatorMapsMask leds->maps (1L <<3) Clients can assign indicator maps to indicators on non-KeyClass input extension devices.

XkbXI_IndicatorStateMask leds->state (1L <<4) Clients can request the status of indicators on non-KeyClass input extension devices.

XkbXI_IndicatorsMask sz_leds (0x1c) XkbXI_IndicatorNamesMask | num_leds XkbXI_IndicatorMapsMask | leds->* XkbXI_IndicatorStateMask

XkbXI_UnsupportedFeaturesMask unsupported (1L <<15)

XkbXI_AllDeviceFeaturesMask Those selected (0x1e) XkbXI_IndicatorsMask | by Value Column XkbSI_ButtonActionsMask masks

XkbXI_AllFeaturesMask Those selected (0x1f) XkbSI_AllDeviceFeaturesMask | by Value Column XkbSI_KeyboardsMask masks

XkbXI_AllDetailsMask Those selected (0x801f) XkbXI_AllFeaturesMask | by Value column XkbXI_UnsupportedFeaturesMask masks

To update a local copy of the state and configuration of an X input extension device with the changes previously noted in an XkbDeviceChangesRec structure, use XkbGetDeviceInfoChanges.


Changes to an Xkb extension device may be tracked by listening to XkbDeviceExtensionNotify events and accumulating the changes in an XkbDeviceChangesRec structure. The changes noted in the structure may then be used in subsequent operations to update either a server configuration or a local copy of an Xkb extension device configuration. The changes structure is defined as follows:

typedef struct _XkbDeviceChanges { unsigned int changed; /* bits indicating what has changed */ unsigned short first_btn; /* number of first button which changed, if any */ unsigned short num_btns; /* number of buttons that have changed */ XkbDeviceLedChangesRec leds; } XkbDeviceChangesRec,*XkbDeviceChangesPtr;



X Version 11 XkbNoteDeviceChanges (3) libX11 1.5.0
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