<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="generator" content="AsciiDoc 8.6.4" />
<title>The X Input Extension 2.x</title>
<style type="text/css">
/* Sans-serif font. */
h1, h2, h3, h4, h5, h6,
div.title, caption.title,
thead, p.table.header,
div#toctitle,
span#author, span#revnumber, span#revdate, span#revremark,
div#footer {
font-family: Arial,Helvetica,sans-serif;
}
/* Serif font. */
div.sectionbody {
font-family: Georgia,"Times New Roman",Times,serif;
}
/* Monospace font. */
tt {
font-size: inherit;
}
body {
margin: 1em 5% 1em 5%;
}
a {
color: blue;
text-decoration: underline;
}
a:visited {
color: fuchsia;
}
em {
font-style: italic;
color: navy;
}
strong {
font-weight: bold;
color: #083194;
}
tt {
font-size: inherit;
color: navy;
}
h1, h2, h3, h4, h5, h6 {
color: #527bbd;
margin-top: 1.2em;
margin-bottom: 0.5em;
line-height: 1.3;
}
h1, h2, h3 {
border-bottom: 2px solid silver;
}
h2 {
padding-top: 0.5em;
}
h3 {
float: left;
}
h3 + * {
clear: left;
}
div.sectionbody {
margin-left: 0;
}
hr {
border: 1px solid silver;
}
p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
ul, ol, li > p {
margin-top: 0;
}
ul > li { color: #aaa; }
ul > li > * { color: black; }
pre {
padding: 0;
margin: 0;
}
span#author {
color: #527bbd;
font-weight: bold;
font-size: 1.1em;
}
span#email {
}
span#revnumber, span#revdate, span#revremark {
}
div#footer {
font-size: small;
border-top: 2px solid silver;
padding-top: 0.5em;
margin-top: 4.0em;
}
div#footer-text {
float: left;
padding-bottom: 0.5em;
}
div#footer-badges {
float: right;
padding-bottom: 0.5em;
}
div#preamble {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.tableblock, div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
div.admonitionblock {
margin-top: 2.0em;
margin-bottom: 2.0em;
margin-right: 10%;
color: #606060;
}
div.content { /* Block element content. */
padding: 0;
}
/* Block element titles. */
div.title, caption.title {
color: #527bbd;
font-weight: bold;
text-align: left;
margin-top: 1.0em;
margin-bottom: 0.5em;
}
div.title + * {
margin-top: 0;
}
td div.title:first-child {
margin-top: 0.0em;
}
div.content div.title:first-child {
margin-top: 0.0em;
}
div.content + div.title {
margin-top: 0.0em;
}
div.sidebarblock > div.content {
background: #ffffee;
border: 1px solid #dddddd;
border-left: 4px solid #f0f0f0;
padding: 0.5em;
}
div.listingblock > div.content {
border: 1px solid #dddddd;
border-left: 5px solid #f0f0f0;
background: #f8f8f8;
padding: 0.5em;
}
div.quoteblock, div.verseblock {
padding-left: 1.0em;
margin-left: 1.0em;
margin-right: 10%;
border-left: 5px solid #f0f0f0;
color: #777777;
}
div.quoteblock > div.attribution {
padding-top: 0.5em;
text-align: right;
}
div.verseblock > pre.content {
font-family: inherit;
font-size: inherit;
}
div.verseblock > div.attribution {
padding-top: 0.75em;
text-align: left;
}
/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
div.verseblock + div.attribution {
text-align: left;
}
div.admonitionblock .icon {
vertical-align: top;
font-size: 1.1em;
font-weight: bold;
text-decoration: underline;
color: #527bbd;
padding-right: 0.5em;
}
div.admonitionblock td.content {
padding-left: 0.5em;
border-left: 3px solid #dddddd;
}
div.exampleblock > div.content {
border-left: 3px solid #dddddd;
padding-left: 0.5em;
}
div.imageblock div.content { padding-left: 0; }
span.image img { border-style: none; }
a.image:visited { color: white; }
dl {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
dt {
margin-top: 0.5em;
margin-bottom: 0;
font-style: normal;
color: navy;
}
dd > *:first-child {
margin-top: 0.1em;
}
ul, ol {
list-style-position: outside;
}
ol.arabic {
list-style-type: decimal;
}
ol.loweralpha {
list-style-type: lower-alpha;
}
ol.upperalpha {
list-style-type: upper-alpha;
}
ol.lowerroman {
list-style-type: lower-roman;
}
ol.upperroman {
list-style-type: upper-roman;
}
div.compact ul, div.compact ol,
div.compact p, div.compact p,
div.compact div, div.compact div {
margin-top: 0.1em;
margin-bottom: 0.1em;
}
div.tableblock > table {
border: 3px solid #527bbd;
}
thead, p.table.header {
font-weight: bold;
color: #527bbd;
}
tfoot {
font-weight: bold;
}
td > div.verse {
white-space: pre;
}
p.table {
margin-top: 0;
}
/* Because the table frame attribute is overriden by CSS in most browsers. */
div.tableblock > table[frame="void"] {
border-style: none;
}
div.tableblock > table[frame="hsides"] {
border-left-style: none;
border-right-style: none;
}
div.tableblock > table[frame="vsides"] {
border-top-style: none;
border-bottom-style: none;
}
div.hdlist {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
div.hdlist tr {
padding-bottom: 15px;
}
dt.hdlist1.strong, td.hdlist1.strong {
font-weight: bold;
}
td.hdlist1 {
vertical-align: top;
font-style: normal;
padding-right: 0.8em;
color: navy;
}
td.hdlist2 {
vertical-align: top;
}
div.hdlist.compact tr {
margin: 0;
padding-bottom: 0;
}
.comment {
background: yellow;
}
.footnote, .footnoteref {
font-size: 0.8em;
}
span.footnote, span.footnoteref {
vertical-align: super;
}
#footnotes {
margin: 20px 0 20px 0;
padding: 7px 0 0 0;
}
#footnotes div.footnote {
margin: 0 0 5px 0;
}
#footnotes hr {
border: none;
border-top: 1px solid silver;
height: 1px;
text-align: left;
margin-left: 0;
width: 20%;
min-width: 100px;
}
div.colist td {
padding-right: 0.5em;
padding-bottom: 0.3em;
vertical-align: top;
}
div.colist td img {
margin-top: 0.3em;
}
@media print {
div#footer-badges { display: none; }
}
div#toc {
margin-bottom: 2.5em;
}
div#toctitle {
color: #527bbd;
font-size: 1.1em;
font-weight: bold;
margin-top: 1.0em;
margin-bottom: 0.1em;
}
div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
margin-top: 0;
margin-bottom: 0;
}
div.toclevel2 {
margin-left: 2em;
font-size: 0.9em;
}
div.toclevel3 {
margin-left: 4em;
font-size: 0.9em;
}
div.toclevel4 {
margin-left: 6em;
font-size: 0.9em;
}
span.aqua { color: aqua; }
span.black { color: black; }
span.blue { color: blue; }
span.fuchsia { color: fuchsia; }
span.gray { color: gray; }
span.green { color: green; }
span.lime { color: lime; }
span.maroon { color: maroon; }
span.navy { color: navy; }
span.olive { color: olive; }
span.purple { color: purple; }
span.red { color: red; }
span.silver { color: silver; }
span.teal { color: teal; }
span.white { color: white; }
span.yellow { color: yellow; }
span.aqua-background { background: aqua; }
span.black-background { background: black; }
span.blue-background { background: blue; }
span.fuchsia-background { background: fuchsia; }
span.gray-background { background: gray; }
span.green-background { background: green; }
span.lime-background { background: lime; }
span.maroon-background { background: maroon; }
span.navy-background { background: navy; }
span.olive-background { background: olive; }
span.purple-background { background: purple; }
span.red-background { background: red; }
span.silver-background { background: silver; }
span.teal-background { background: teal; }
span.white-background { background: white; }
span.yellow-background { background: yellow; }
span.big { font-size: 2em; }
span.small { font-size: 0.6em; }
</style>
<script type="text/javascript">
/*<+'])');
// Function that scans the DOM tree for header elements (the DOM2
// nodeIterator API would be a better technique but not supported by all
// browsers).
var iterate = function (el) {
for (var i = el.firstChild; i != null; i = i.nextSibling) {
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
var mo = re.exec(i.tagName);
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
}
iterate(i);
}
}
}
iterate(el);
return result;
}
var toc = document.getElementById("toc");
var entries = tocEntries(document.getElementById("content"), toclevels);
for (var i = 0; i < entries.length; ++i) {
var entry = entries[i];
if (entry.element.id == "")
entry.element.id = "_toc_" + i;
var a = document.createElement("a");
a.href = "#" + entry.element.id;
a.appendChild(document.createTextNode(entry.text));
var div = document.createElement("div");
div.appendChild(a);
div.className = "toclevel" + entry.toclevel;
toc.appendChild(div);
}
if (entries.length == 0)
toc.parentNode.removeChild(toc);
},
/////////////////////////////////////////////////////////////////////
// Footnotes generator
/////////////////////////////////////////////////////////////////////
/* Based on footnote generation code from:
* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
*/
footnotes: function () {
var cont = document.getElementById("content");
var noteholder = document.getElementById("footnotes");
var spans = cont.getElementsByTagName("span");
var refs = {};
var n = 0;
for (i=0; i<spans.length; i++) {
if (spans[i].className == "footnote") {
n++;
// Use [\s\S] in place of . so multi-line matches work.
// Because JavaScript has no s (dotall) regex flag.
note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
noteholder.innerHTML +=
"<div class='footnote' id='_footnote_" + n + "'>" +
"<a href='#_footnoteref_" + n + "' title='Return to text'>" +
n + "</a>. " + note + "</div>";
spans[i].innerHTML =
"[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
"' title='View footnote' class='footnote'>" + n + "</a>]";
var id =spans[i].getAttribute("id");
if (id != null) refs["#"+id] = n;
}
}
if (n == 0)
noteholder.parentNode.removeChild(noteholder);
else {
// Process footnoterefs.
for (i=0; i<spans.length; i++) {
if (spans[i].className == "footnoteref") {
var href = spans[i].getElementsByTagName("a")[0].getAttribute("href");
href = href.match(/#.*/)[0]; // Because IE return full URL.
n = refs[href];
spans[i].innerHTML =
"[<a href='#_footnote_" + n +
"' title='View footnote' class='footnote'>" + n + "</a>]";
}
}
}
}
}
/*]]>*/
</script>
</head>
<body class="article">
<div id="header">
<h1>The X Input Extension 2.x</h1>
<div id="toc">
<div id="toctitle">Table of Contents</div>
<noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><div class="title">This is a work in progress!</div><p>Authors:</p></div>
<div class="ulist"><ul>
<li>
<p>
Peter Hutterer (Red Hat) <<a href="mailto:peter.hutterer@redhat.com">peter.hutterer@redhat.com</a>>
</p>
</li>
<li>
<p>
Daniel Stone (Collabora Ltd.) <<a href="mailto:daniel@fooishbar.org">daniel@fooishbar.org</a>>
</p>
</li>
<li>
<p>
Chase Douglas (Canonical, Ltd.) <<a href="mailto:chase.douglas@canonical.com">chase.douglas@canonical.com</a>>
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="history">1. History</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
v2.2, ??: Multitouch support added
</p>
</li>
<li>
<p>
v2.1, December 2011: new raw event behaviour, smooth scrolling support
added
</p>
</li>
<li>
<p>
v2.0, October 2009: Initial release of XI2 protocol
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="xi22-usecases">Appendix A: XI 2.2 Use-cases</h2>
<div class="sectionbody">
<div class="paragraph"><p>All use-cases that include the receiving and processing of touch events
require the client to announce XI 2.2 support in the XIQueryVersion request.</p></div>
<div class="sect2">
<h3 id="_client_c_wants_to_process_touch_events_from_a_device_d_on_window_w">Client C wants to process touch events from a device D on window W.</h3>
<div class="ulist"><ul>
<li>
<p>
C calls XISelectEvent for XI_Touch{Begin|Update|End} from D on W.
</p>
</li>
<li>
<p>
C receives TouchBegin whenever a touch sequence starts within W’s borders.
</p>
</li>
<li>
<p>
C receives TouchUpdate events whenever an axis valuator value changes for a
touch sequence it received a TouchBegin event for.
</p>
</li>
<li>
<p>
C receives TouchEnd whenever a touch it received a TouchBegin event for
ceases.
</p>
</li>
</ul></div>
<div class="sect3">
<h4 id="_while_client_i_wants_to_pre_process_touch_events_from_device_d_on_the_parent_window_of_w">While client I wants to pre-process touch events from device D on the parent window of W.</h4>
<div class="ulist"><ul>
<li>
<p>
C calls XISelectEvent for XI_Touch{Begin|Update|Ownership|End} from D on W.
</p>
</li>
<li>
<p>
I calls XIPassiveGrab for XI_Touch{Begin|Update|Ownership|End} from D on a
parent window of W.
</p>
</li>
<li>
<p>
I receives TouchBegin whenever a touch begins within window W, as well as a
TouchOwnership event indicating that it currently owns the touch sequence.
C receives a TouchBegin event as well, but without TouchOwnership.
</p>
</li>
<li>
<p>
When an axis valuator changes in this touch sequence, both I and C receive a
TouchUpdate event. I may process the event to determine if it is going to
accept or reject the touch, whereas C may perform reversible processing.
</p>
</li>
<li>
<p>
If I decides it is going to claim the touch sequence for its exclusive
processing, it calls XIAllowEvents with an event mode of XIAcceptTouch; at
this point, C receives a TouchEnd event, and undoes any processing it has
already performed due to the touch sequence. Further TouchUpdate events are
delivered only to I.
</p>
</li>
<li>
<p>
Alternatively, if I decides it does not want to receive further events
from this touch sequence, it calls XIAllowEvents with an event mode of
XIRejectTouch; at this point, I receives a TouchEnd event confirming that it
has rejected the touch. C receives a TouchOwnership event confirming that it
is now the new owner of the touch, and further TouchUpdate events are
delivered only to C. As C now owns the touch, it is free to perform
irreversible processing of the sequence.
</p>
</li>
<li>
<p>
When the touch physically ceases, a TouchEnd event is sent to C.
</p>
</li>
</ul></div>
</div>
<div class="sect3">
<h4 id="_while_client_i_wants_to_process_pointer_events_on_window_w_8217_s_parent_window_y">While client I wants to process pointer events on window W’s parent, window Y.</h4>
<div class="ulist"><ul>
<li>
<p>
I calls XIPassiveGrab for XI_{ButtonPress,MotionNotify,ButtonRelease} to
create a synchronous pointer grab from D on Y.
</p>
</li>
<li>
<p>
C calls XISelectEvent for XI_Touch{Begin|Update|Ownership|End} from D on W.
</p>
</li>
<li>
<p>
I receives a ButtonPress event whenever a touch begins within W, and is
considered the owner of the event. C receives a TouchBegin event, but does
not receive a TouchOwnership event.
</p>
</li>
<li>
<p>
When the touchpoint moves, C will receive a TouchUpdate event. Event
delivery to I is subject to the synchronous delivery mechanism. The
emulated motion notify event is queued in the server while the device is
frozen.
</p>
</li>
<li>
<p>
I may assert ownership by calling XIAllowEvents on Y with any mode other
than ReplayDevice, which will cause all further events to be sent only to I,
with a TouchEnd event being sent to C.
</p>
</li>
<li>
<p>
Alternatively, I may reject the touch sequence by calling XIAllowEvents on
Y with mode ReplayDevice, which will cause no further events from that touch
to be sent to I, and a TouchOwnership event to be sent to C, with subsequent
motion events being sent as TouchUpdate events.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect2">
<h3 id="_driver_drv_provides_touch_support_from_tracked_device_d">Driver DRV provides touch support from tracked device D:</h3>
<div class="ulist"><ul>
<li>
<p>
DRV initializes a TouchClass for the device.
</p>
</li>
<li>
<p>
DRV parses D’s device protocol and selects one touch sequence to be emulated
as pointer event.
</p>
</li>
<li>
<p>
DRV calls the respective input driver API with the touch sequence data. The
touch sequence emulating a pointer has the respective flag set. DRV does not
submit pointer data for any touchpoint.
</p>
</li>
</ul></div>
</div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2012-01-25 15:49:25 EST
</div>
</div>
</body>
</html>