X Version 11, Release 7.7
Version 2.2
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Table of Contents
This extension is a minimal set of client and server extensions required to completely test the X11 server with no user intervention.
This extension is not intended to support general journaling and playback of user actions. This is a difficult area [XTrap, 89] as it attempts to synchronize synthetic user interactions with their effects; it is at the higher level of dialogue recording/playback rather than at the strictly lexical level. We are interested only in the latter, simpler, case. A more detailed discussion and justification of the extension functionality is given in [Drake, 91].
We are aiming only to provide a minimum set of facilities that solve immediate testing and validation problems. The testing extension itself needs testing, where possible, and so should be as simple as possible.
We have also tried to:
Confine the extension to an appropriate high level within the server to minimize portability problems. In practice this means that the extension should be at the DIX level or use the DIX/DDX interface, or both. This has effects, in particular, on the level at which "input synthesis" can occur.
Minimize the changes required in the rest of the server.
Minimize performance penalties on normal server operation.
The functions provided by this extension fall into two groups:
Client Operations
These routines manipulate otherwise hidden client-side behavior.
The actual implementation will depend on the details of the actual language
binding and what degree of request buffering, GContext caching, and so on, is
provided. In the C binding, defined in section 7, routines are provided
to access the internals of two opaque data structures -
GCs
and
Visuals - and to discard any requests pending within the
output buffer of a connection. The exact details can be expected to differ for
other language bindings.
Server Requests
The first of these requests is similar to that provided in most extensions: it allows a client to specify a major and minor version number to the server and for the server to respond with major and minor versions of its own. The remaining two requests allow the following:
Access to an otherwise "write-only" server resource: the cursor associated with a given window
Perhaps most importantly, limited synthesis of input device events, almost as if a cooperative user had moved the pointing device or pressed a key or button.
The C functions either provide direct access to the protocol and add no additional semantics to those defined in section 5 or they correspond directly to the abstract descriptions of client operations in section 4.
All XTEST extension functions and procedures, and all manifest constants and macros, will start with the string "XTest". All operations are classified as server/client (Server) or client-only (Client). All routines that have return type Status will return nonzero for "success" and zero for "failure." Even if the XTEST extension is supported, the server may withdraw such facilities arbitrarily; in which case they will subsequently return zero.
The include file for this extension is <X11/extensions/XTest.h>.
Bool XTestQueryExtension(Display *display, int *event_base, int *error_base, int *major_version, int *minor_version);
XTestQueryExtension
returns
True
if the specified display supports the XTEST extension, else
False
If the extension is supported, *event_base would be set to the event number
for the first event for this extension and *error_base would be set to the
error number for the first error for this extension. As no errors or
events are defined for this version of the extension, the values returned
here are not defined (nor useful). If the extension is supported,
*major_version and *minor_version are set to the major and minor version
numbers of the extension supported by the display. Otherwise, none of
the arguments are set.
If the extension is supported,
XTestCompareCursorWithWindow
performs a comparison of the cursor whose ID is specified by cursor (which
may be
None
with the cursor of the window specified by window returning
True
if they are the same and
False
otherwise. If the extension is not supported, then the request is ignored and
zero is returned.
If the extension is supported,
XTestCompareCurrentCursorWithWindow
performs a comparison of the current cursor with the cursor of the specified
window returning
True
if they are the same and
False
otherwise. If the extension is not supported, then the request is ignored and
zero is returned.
If the extension is supported,
XTestFakeKeyEvent
requests the server to simulate either a
KeyPress
(if is_press is
True
or a
KeyRelease
(if is_press is
False
of the key with the specified keycode; otherwise, the request is ignored.
If the extension is supported, the simulated event will not be processed
until delay milliseconds after the request is received (if delay is
CurrentTime
then this is interpreted as no delay at all). No other requests from
this client will be processed until this delay, if any, has expired
and subsequent processing of the simulated event has been completed.
If the extension is supported,
XTestFakeButtonEvent
requests the server to simulate either a
ButtonPress
(if is_press is
True
or a
ButtonRelease
(if is_press is
False
of the logical button numbered by the specified button; otherwise, the
request is ignored.
If the extension is supported,
the simulated event will not be processed until delay milliseconds
after the request is received (if delay is
CurrentTime
then this is interpreted as no delay at all). No other requests from
this client will be processed until this delay, if any, has expired
and subsequent processing of the simulated event has been completed.
If the extension is supported,
XTestFakeMotionEvent
requests the server to simulate a movement of the pointer to the specified
position (x, y) on the root window of screen_number; otherwise, the request
is ignored. If screen_number is -1, the current screen (that the pointer
is on) is used.
If the extension is supported, the simulated event will not be processed
until delay milliseconds after the request is received (if delay is
CurrentTime
then this is interpreted as no delay at all). No other requests from
this client will be processed until this delay, if any, has expired
and subsequent processing of the simulated event has been completed.
XTestFakeRelativeMotionEvent(Display *display, int screen_number, int x, int y, unsigned long delay);
If the extension is supported,
XTestFakeRelativeMotionEvent
requests the server to simulate a movement of the pointer by the specified
offsets (x, y) relative to the current pointer position on screen_number;
otherwise, the request is ignored. If screen_number is -1, the
current screen (that the pointer is on) is used.
If the extension is supported, the simulated event will not be processed
until delay milliseconds after the request is received (if delay is
CurrentTime
then this is interpreted as no delay at all). No other requests from
this client will be processed until this delay, if any, has expired
and subsequent processing of the simulated event has been completed.
If impervious is
True
then the executing client becomes impervious to server grabs. If impervious is
False
then the executing client returns to the normal state of being susceptible
to server grabs.
XTestSetGContextOfGC
sets the GContext within the opaque datatype referenced by gc to
be that specified by gid.
XTestSetVisualIDOfVisual
sets the VisualID within the opaque datatype referenced by visual to
be that specified by visualid.
XTestDiscard
discards any requests within the output buffer for the specified display.
It returns
True
if any requests were discarded; otherwise, it returns
False