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XtInsertEventTypeHandler(3Xt) manual page
Table of Contents
XtInsertEventTypeHandler, XtRemoveEventTypeHandler,
XtRegisterExtensionSelector, XtSetEventDispatcher, XtDispatchEventToWidget
- extension event handling
void XtInsertEventTypeHandler(widget, event_type,
select_data, proc, client_data, position)
Widget wdget;
int event_type;
XtPointer select_data;
XtEventHandler proc;
XtPointer client_data;
XtListPosition position;
void XtRemoveEventTypeHandler(widget, event_type, select_data, proc, client_data)
Widget wdget;
int event_type;
XtPointer select_data;
XtEventHandler proc;
XtPointer client_data;
void XtRegisterExtensionSelector(display, min_event_type, max_event_type,
proc, client_data)
Display* display;
int min_event_type;
int max_event_type;
XtExtensionSelectProc proc;
XtPointer client_data;
XtEventDispatchProc XtSetEventDispatcher(display, event_type, proc)
Widget widget;
int event_type;
XtEventDispatchProc proc;
Boolean XtDispatchEventToWidget(widget, event)
Widget widget;
XEvent* event;
- widget
- Specifies the widget for this event handler. Must be of
class Core or any subclass thereof.
- event_type
- Specifies the event type.
- select_data
- Specifies
data used to select or deselect events from the server.
- proc
- Specifies the
proc.
- client_data
- Specifies additional data to be passed to the event handler.
- position
- Specifies when the event handler is to be called relative to other
previously registered handlers.
- display
- Specifies the display.
- min_event_type, max_event_type
- Specifies
the range of event types for this extension.
- event
- Specifies a pointer to
the event to be dispatched.
The XtInsertEventTypeHandler function
registeres a procedure with the dispatch mechanism that is to be called
when an event that matches the specified event_type is dispatched to the
specified widget.
If event_type is one of the core X protocol events then
select_data must be a pointer to a value of type EventMask, indicating
the event mask to be used to select for the desired event. This event mask
will be included in the value returned by XtBuildEventMask. If the widget
is realized XtInsertEventTypeHandler calls XSelectInput if necessary.
Specifying NULL for select_data is equivalent to specifying a pointer to
an event mask containing 0. This is similar to the XtInsertRawEventHandler
function.
If event_type specifies an extension event type then the semantics
of the data pointed to by select_data are defined by the extension selector
registered for the specified event type.
In either case the Intrinsics are
not required to copy the data pointed to by select_data, so the caller
must ensure that it remains valid as long as the event handler remains
registered with this value of select_data.
The position argument allows
the client to control the order of the invocation of event handlers registered
for the same event type. If the client does not care about the order, it
should normally specify XtListTail, which registers this event handler
after any previously registered handlers for this event type.
The XtRemoveEventTypeHandler
function unregisters an even handler registered with XtInsertEventTypeHandler
for the specified event type. The request is ignored if client_data does
not match the value given with the handler was registered.
If event_type
specifies on of the core X protocol events, select_data must be a pointer
to a value of type EventMask, indicating the mask to be used to deselect
for the appropriate event. If the widget is realized, XtRemoveEventTypeHandler
calls XSelectInput if necessary. Specifying NULL for select_data is
equivalent to specifying a pointer to an event mask containing 0. This is
similar to the XtRemoveRawEventHandler function.
If event_type specifies
an extension event type then the semantics of the data pointed to by select_data
are defined by the extension selector registered for the specified event
type.
The XtRegisterExtensionSelector function registers a procedure to
arrange for the delivery of extension events to widgets.
If min_event_type
and max_event_type match the parameters to a previous call to XtRegisterExtensionSelector
for the same display, the proc and client_data replace the previously
registered values. If the range specified by min_event_type and max_event_type
overlaps the range of the parameters to a previous call for the same display
in any other way, an error results.
The XtSetEventDispatcher function
registes the event dispatcher procedure specified by proc for event swith
the type event_type. The previously registered dispatcher (or the default
dispatcher if there was no previousl registered dispatcher) is returned.
If proc is NULL, the default procedure is restored for the specified type.
In the future, when XtDispatchEvent is called with an event of event_type,
the specified proc (or the default dispatcher) will be invoked to determine
a widget ot which to dispatch the event.
The XtDispatchEventToWidget function
scans the list of registered event handlers for the specified widget and
calls each handler that has been registered for the specified event type,
subject to the continue_to_dispatch value returned by each handler. The
Intrinsics behave as if event handlers were registered at the head of the
list for Expose, NoExpose, GraphicsExpose, and VisibilityNotify
events to invoke the widget's expose procedure according to the exposure
compression rules and to update the widget's visible field if visible_interest
is True. These internal event handlers never set continue_to_dispatch
to False.
XtDispatchEventToWidget returns True if any event handler
was called and False otherwise.
XtGetKeyboardFocusWidget(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
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- bcl
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- bo
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- br
- bs
- bug
- bxr
- ca
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- cdo
- ce
- ceb
- ch
- cho
- chr
- chy
- co
- cr
- crh
- cs
- csb
- cu
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- cy
- da
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- diq
- dsb
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- dz
- ee
- el
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- eo
- es
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- eu
- ext
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- ff
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- fiu_vro
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- fy
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- got
- gu
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- ha
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- hi
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- ho
- hr
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- hy
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- ie
- ig
- ii
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- ilo
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- it
- iu
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- ka
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- kv
- kw
- ky
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- lg
- li
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- lv
- map_bms
- mdf
- mg
- mh
- mi
- mk
- ml
- mn
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- mr
- mt
- mus
- my
- myv
- mzn
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- nap
- nds
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- ne
- new
- ng
- nl
- nn
- no
- nov
- nrm
- nv
- ny
- oc
- om
- or
- os
- pa
- pag
- pam
- pap
- pdc
- pi
- pih
- pl
- pms
- ps
- pt
- qu
- quality
- rm
- rmy
- rn
- ro
- roa_rup
- roa_tara
- ru
- rw
- sa
- sah
- sc
- scn
- sco
- sd
- se
- sg
- sh
- si
- simple
- sk
- sl
- sm
- sn
- so
- sr
- srn
- ss
- st
- stq
- su
- sv
- sw
- szl
- ta
- te
- tet
- tg
- th
- ti
- tk
- tl
- tlh
- tn
- to
- tpi
- tr
- ts
- tt
- tum
- tw
- ty
- udm
- ug
- uk
- ur
- uz
- ve
- vec
- vi
- vls
- vo
- wa
- war
- wo
- wuu
- xal
- xh
- yi
- yo
- za
- zea
- zh
- zh_classical
- zh_min_nan
- zh_yue
- zu
-
Static
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- als
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- ang
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- ba
- bar
- bat_smg
- bcl
- be
- be_x_old
- bg
- bh
- bi
- bm
- bn
- bo
- bpy
- br
- bs
- bug
- bxr
- ca
- cbk_zam
- cdo
- ce
- ceb
- ch
- cho
- chr
- chy
- co
- cr
- crh
- cs
- csb
- cu
- cv
- cy
- da
- de
- diq
- dsb
- dv
- dz
- ee
- el
- eml
- eo
- es
- et
- eu
- ext
- fa
- ff
- fi
- fiu_vro
- fj
- fo
- fr
- frp
- fur
- fy
- ga
- gan
- gd
- gl
- glk
- gn
- got
- gu
- gv
- ha
- hak
- haw
- he
- hi
- hif
- ho
- hr
- hsb
- ht
- hu
- hy
- hz
- ia
- id
- ie
- ig
- ii
- ik
- ilo
- io
- is
- it
- iu
- ja
- jbo
- jv
- ka
- kaa
- kab
- kg
- ki
- kj
- kk
- kl
- km
- kn
- ko
- kr
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- ksh
- ku
- kv
- kw
- ky
- la
- lad
- lb
- lbe
- lg
- li
- lij
- lmo
- ln
- lo
- lt
- lv
- map_bms
- mdf
- mg
- mh
- mi
- mk
- ml
- mn
- mo
- mr
- mt
- mus
- my
- myv
- mzn
- na
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- pt
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- rm
- rmy
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- ro
- roa_rup
- roa_tara
- ru
- rw
- sa
- sah
- sc
- scn
- sco
- sd
- se
- sg
- sh
- si
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- sl
- sm
- sn
- so
- sr
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- ss
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- stq
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- vo
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