08-20-2015
Thank you very much, I agre I dont have to go with syntax, however I got confused understandin $1, how is it exactly behaving and this clears my understanding.
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LEARN ABOUT X11R4
xgetdevicedontpropagatelist
XChangeDeviceDontPropagateList(3) X FUNCTIONS XChangeDeviceDontPropagateList(3)
NAME
XChangeDeviceDontPropagateList, XGetDeviceDontPropagateList - query or change the dont-propagate-list for extension devices
SYNTAX
int XChangeDeviceDontPropagateList(Display *display, Window *window, int *count, XEventClass *event_list, int mode);
XEventClass *XGetDeviceDontPropagateList(Display *display, Window *window, int *count);
ARGUMENTS
display Specifies the connection to the X server.
window Specifies the window whose dont-propagate-list is to be queried or modified.
event_list Specifies a pointer to a list of event classes.
mode Specifies the mode. You can pass AddToList , or DeleteFromList.
count Specifies the number of event classes in the list.
DESCRIPTION
The XChangeDeviceDontPropagateList request modifies the list of events that should not be propagated to ancestors of the event window.
This request allows extension events to be added to or deleted from that list. By default, all events are propagated to ancestor windows.
Once modified, the list remains modified for the life of the window. Events are not removed from the list because the client that added
them has terminated.
Suppression of event propagation is not allowed for all input extension events. If a specified event class is one that cannot be sup-
pressed, a BadClass error will result. Events that can be suppressed include DeviceKeyPress, DeviceKeyRelease, DeviceButtonPress, Device-
ButtonRelease, DeviceMotionNotify, ProximityIn, and ProximityOut.
XChangeDeviceDontPropagateList can generate a BadDevice, BadClass, or BadValue error.
The XGetDeviceDontPropagateList request queries the list of events that should not be propagated to ancestors of the event window.
XGetDeviceDontPropagateList can generate a BadClass or BadWindow error.
DIAGNOSTICS
BadDevice An invalid device was specified. The specified device does not exist or has not been opened by this client via XOpenInputDe-
vice. This error may also occur if some other client has caused the specified device to become the X keyboard or X pointer
device via the XChangeKeyboardDevice or XChangePointerDevice requests.
BadValue Some numeric value falls outside the range of values accepted by the request. Unless a specific 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 gener-
ate this error.
BadWindow An invalid window id was specified.
BadClass An invalid event class was specified.
SEE ALSO
Programming With Xlib
X Version 11 libXi 1.2.1 XChangeDeviceDontPropagateList(3)