XkbChangeControls man page

XkbChangeControls — Provides a flexible method for updating the controls in a server to match those in the changed keyboard description

Synopsis

Bool XkbChangeControls (Display *dpy, XkbDescPtr xkb, XkbControlsChangesPtr changes);

Arguments

- dpy
connection to X server
- xkb
keyboard description with changed xkb->ctrls
- changes
which parts of xkb->ctrls have changed

Description

The XkbControlsChangesRec structure allows applications to track modifications to an XkbControlsRec structure and thereby reduce the amount of traffic sent to the server. The same XkbControlsChangesRec structure may be used in several successive modifications to the same XkbControlsRec structure, then subsequently used to cause all of the changes, and only the changes, to be propagated to the server.

The changed_ctrls field is a mask specifying which logical sets of data in the controls structure have been modified. In this context, modified means set, that is, if a value is set to the same value it previously contained, it has still been modified, and is noted as changed. Valid values for changed_ctrls are any combination of the masks listed in Table 1 that have "ok" in the changed_ctrls column. Setting a bit implies the corresponding data fields from the "Relevant XkbControlsRec Data Fields" column in Table 1 have been modified. The enabled_ctrls_changes field specifies which bits in the enabled_ctrls field have changed. If the number of keyboard groups has changed, the num_groups_changed field is set to True.

Table 1 shows the actual values for the individual mask bits used to select controls for modification and to enable and disable the control. Note that the same mask bit is used to specify general modifications to the parameters used to configure the control (which), and to enable and disable the control (enabled_ctrls). The anomalies in the table (no "ok" in column) are for controls that have no configurable attributes; and for controls that are not boolean controls and therefore cannot be enabled or disabled.

Table 1 Xkb Controls
ControlControl
SelectionRelevant
MaskXkbControlsRecBoolean Control
(which parameter)DataFieldsenabled_ctrls bitSection

AccessXFeedbackXkbAccessXFeedbackMaskax_options:XkbAccessXFeedbackMask10.6.3
XkbAX_*FBMask
AccessXKeysXkbAccessXKeysMask10.6.1
AccessXTimeoutXkbAccessXTimeoutMaskax_timeoutXkbAccessXTimeoutMask10.6.2
axt_opts_mask
axt_opts_values
axt_ctrls_mask
axt_ctrls_values
AudibleBellXkbAudibleBellMask9.2
AutoReset10.1.2
BounceKeysXkbBounceKeysMaskdebounce_delayXkbBounceKeysMask10.6.7
Detectable-10.3.3
Autorepeat
EnabledControlsXkbControlsEnabledMaskenabled_ctrlsNon-Boolean Control10.1.1
GroupsWrapXkbGroupsWrapMaskgroups_wrapNon-Boolean Control10.7.1
IgnoreGroupLockXkbIgnoreGroupLockMask10.7.3
IgnoreLockModsXkbIgnoreLockModsMaskignore_lockNon-Boolean Control5.1
InternalModsXkbInternalModsMaskinternalNon-Boolean Control5.1
MouseKeysXkbMouseKeysMaskmk_dflt_btnXkbMouseKeysMask10.5.1
MouseKeysAccelXkbMouseKeysAccelMaskmk_delayXkbMouseKeysAccelMask10.5.2
mk_interval
mk_time_to_max
mk_max_speed
mk_curve
Overlay1XkbOverlay1Mask10.4
Overlay2XkbOverlay2Mask10.4
PerKeyRepeatXkbPerKeyRepeatMaskper_key_repeatNon-Boolean Control10.3.1
RepeatKeysXkbRepeatKeysMaskrepeat_delayXkbRepeatKeysMask10.3
repeat_interval
SlowKeysXkbSlowKeysMaskslow_keys_delayXkbSlowKeysMask10.6.6
StickyKeysXkbStickyKeysMaskax_options:XkbStickyKeysMask10.6.8
XkbAX_TwoKeysMask
XkbAX_LatchToLockMask

Table 2 shows the actual values for the individual mask bits used to select controls for modification and to enable and disable the control. Note that the same mask bit is used to specify general modifications to the parameters used to configure the control (which), and to enable and disable the control (enabled_ctrls). The anomalies in the table (no "ok" in column) are for controls that have no configurable attributes; and for controls that are not boolean controls and therefore cannot be enabled or disabled.

Table 2 Controls Mask Bits
Mask Bitwhich orenabledValue
changed_ctrls_ctrls
XkbRepeatKeysMaskokok(1L<<0)
XkbSlowKeysMaskokok(1L<<1)
XkbBounceKeysMaskokok(1L<<2)
XkbStickyKeysMaskokok(1L<<3)
XkbMouseKeysMaskokok(1L<<4)
XkbMouseKeysAccelMaskokok(1L<<5)
XkbAccessXKeysMaskokok(1L<<6)
XkbAccessXTimeoutMaskokok(1L<<7)
XkbAccessXFeedbackMaskokok(1L<<8)
XkbAudibleBellMaskok(1L<<9)
XkbOverlay1Maskok(1L<<10)
XkbOverlay2Maskok(1L<<11)
XkbIgnoreGroupLockMaskok(1L<<12)
XkbGroupsWrapMaskok(1L<<27)
XkbInternalModsMaskok(1L<<28)
XkbIgnoreLockModsMaskok(1L<<29)
XkbPerKeyRepeatMaskok(1L<<30)
XkbControlsEnabledMaskok(1L<<31)
XkbAccessXOptionsMaskokok(XkbStickyKeysMask |
XkbAccessXFeedbackMask)
XkbAllBooleanCtrlsMaskok(0x00001FFF)
XkbAllControlsMaskok(0xF8001FFF)

If you have an Xkb description with controls that have been modified and an XkbControlsChangesRec that describes the changes that have been made, the XkbChangeControls function provides a flexible method for updating the controls in a server to match those in the changed keyboard description.

XkbChangeControls copies any controls fields specified by changes from the keyboard description controls structure, xkb->ctrls, to the server specified by dpy.

Structures

The XkbControlsChangesRec structure is defined as follows:

typedef struct _XkbControlsChanges {
    unsigned int  changed_ctrls;         /∗ bits indicating changed control data 
*/
    unsigned int  enabled_ctrls_changes; /∗ bits indicating enabled/disabled 
controls */
    Bool          num_groups_changed;    /∗ True if number of keyboard groups 
changed */
} XkbControlsChangesRec,*XkbControlsChangesPtr;

Info

libX11 1.6.4 X Version 11 XKB FUNCTIONS