XSetDeviceModifierMapping


NAME

XGetDeviceModifierMapping, XSetDeviceModifierMapping - query or change device modifier mappings

SYNTAX

XSetDeviceModifierMapping(display, device, modmap) Display *display; XDevice *device; XModifierKeymap *modmap; XModifierKeymap *XGetDeviceModifierMapping(display, device) Display *display; XDevice *device;

ARGUMENTS

display Specifies the connection to the X server. device Specifies the device whose modifier mapping is to be queried or modified. modmap Specifies a pointer to the XModifierKeymap structure.

DESCRIPTION

The XSetDeviceModifierMapping request specifies the Key- Codes of the keys (if any) that are to be used as modi- fiers for the specified device. If it succeeds, the X server generates a DeviceMappingNotify event, and XSetDe- viceModifierMapping returns MappingSuccess. X permits at most eight modifier keys. If more than eight are speci- fied in the XModifierKeymap structure, a BadLength error results. The modifiermap member of the XModifierKeymap structure contains eight sets of max_keypermod KeyCodes, one for each modifier in the order Shift, Lock, Control, Mod1, Mod2, Mod3, Mod4, and Mod5. Only nonzero KeyCodes have meaning in each set, and zero KeyCodes are ignored. In addition, all of the nonzero KeyCodes must be in the range specified by min_keycode and max_keycode as returned by XListInputDevices, or a BadValue error results. No Key- Code may appear twice in the entire map, or a BadValue error results. An X server can impose restrictions on how modifiers can be changed, for example, if certain keys do not generate up transitions in hardware, if auto-repeat cannot be dis- abled on certain keys, or if multiple modifier keys are not supported. If some such restriction is violated, the status reply is MappingFailed, and none of the modifiers are changed. If the new KeyCodes specified for a modifier differ from those currently defined and any (current or new) keys for that modifier are in the logically down state, XSetDeviceModifierMapping returns MappingBusy, and none of the modifiers is changed. XSetDeviceModifierMapping can generate BadLengthP, BadDe- vice, BadMatch, BadAlloc, and BadValue errors. The XGetDeviceModifierMapping request returns a pointer to a newly created XModifierKeymap structure that contains the keys being used as modifiers. The structure should be freed after use by calling XFreeModifierMapping . If only zero values appear in the set for any modifier, that modi- fier is disabled. XGetDeviceModifierMapping can generate BadDevice and Bad- Match errors.

STRUCTURES

The XModifierKeymap structure contains: typedef struct { int max_keypermod; KeyCode *modifiermap; } XModifierKeymap;

DIAGNOSTICS

BadLength More than eight keys were specified in the XModifierKeymap structure. BadAlloc The server failed to allocate the requested resource or server memory. BadDevice An invalid device was specified. The speci- fied device does not exist or has not been opened by this client via XOpenInputDevice. This error may also occur if the specified device is the X keyboard or X pointer device. BadMatch This error may occur if an XGetDeviceModi- fierMapping or XChangeDeviceModifierMapping request was made specifying a device that has no keys. BadValue Some numeric value falls outside the range of values accepted by the request. Unless a spe- cific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error.

SEE ALSO

XSetDeviceKeyMapping(3) XSetDeviceButtonMapping(3) Programming With Xlib

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