XICHANGEHIERARCHY - Online Linux Manual PageSection : 3
Updated : 09/15/2021
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NAMEXIChangeHierarchy − change the device hierarchy​.

SYNOPSIS#include <X11/extensions/XInput2​.h>Status XIChangeHierarchy( Display *display, XIAnyHierarchyChangeInfo *changes, int num_changes);display Specifies the connection to the X server​.num_changes Specifies the number of elements in changes​.changes Specifies the changes to be made​.

DESCRIPTIONXIChangeHierarchy modifies the device hierarchy by creating or removing master devices or changing the attachment of slave devices​. If num_changes is non−zero, changes is an array of XIAnyHierarchyChangeInfo structures​. If num_changes is equal or less than zero, XIChangeHierarchy does nothing​.XIChangeHierarchy processes changes in order, effective immediately​. If an error occurs, processing is aborted and the error is reported to the client​. Changes already made remain effective​.The list of changes is any combination of XIAnyHierarchyChangeInfo​. The type of a hierarchy change can be XIAddMaster, XIRemoveMaster, XIAttachSlave or XIDetachSlave​.typedef union { int type; XIAddMasterInfo add; XIRemoveMasterInfo remove; XIAttachSlave attach; XIDetachSlave detach; } XIAnyHierarchyChangeInfo;typedef struct { int type; /* XIAddMaster */ char* name; Bool send_core; Bool enable; } XIAddMasterInfo;typedef struct { int type; /* XIRemoveMaster */ int deviceid; int return_mode; int return_pointer; int return_keyboard; } XIRemoveMasterInfo;typedef struct { int type; /* XIAttachSlave */ int deviceid; int new_master; } XIAttachSlaveInfo;typedef struct { int type; /* XIDetachSlave */ int deviceid; } XIDetachSlaveInfo;XIAddMasterInfo creates a new master pointer and a new master keyboard labeled "name pointer" and "name keyboard" respectively​. If sendCore is True, the devices will send core events​. If enable is True, the device is enabled immediately​.XIAddMasterInfo can generate a BadValue error​.XIRemoveMasterInfo removes device and its paired master device​. If returnMode is XIAttachToMaster, all pointers attached to device or its paired master device are attached to returnPointer​. Likewise, all keyboards are attached to returnKeyboard​. If returnMode is XIFloating, all attached devices are set to floating​.XIRemoveMasterInfo can generate a BadValue and a BadDevice error​.XIAttachSlaveInfo attaches device to new_master​. If the device is currently attached to a master device, it is detached from the master device and attached to the new master device​.XIAttachSlaveInfo can generate a BadDevice error​.XIDetachSlaveInfo detaches device from the current master device and sets it floating​. If the device is already floating, no changes are made​.XIDetachSlaveInfo can generate a BadDevice error​.XIChangeHierarchy generates an XIHierarchyEvent if any modifications were successful​.

DIAGNOSTICSBadDevice An invalid device was specified​. The device does not exist or is not a appropriate for the type of change​.BadValue Some numeric value falls out of the allowed range​.
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