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<html lang="en"> |
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<meta charset="utf-8"> |
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<title>Creating Synthetic Events</title> |
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<h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1> |
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<a href="#toc" class="jump">Jump to Table of Contents</a> |
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<h1>Creating Synthetic Events</h1> |
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<div class="yui3-g"> |
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<div class="yui3-u-3-4"> |
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<div id="main"> |
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<div class="content"><div class="intro"> |
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<p>Synthetic events are usually named abstractions that bind to existing |
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DOM events to monitor user actions for specific patterns. However, at |
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heart they are no more than a set of callbacks executed in response to |
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various triggering methods in the DOM event system.</p> |
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<p>You can do all sorts of things with synthetic events, including:</p> |
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<ul> |
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<li> |
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redefine native DOM events that behave inconsistently across |
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browsers (e.g. <a href="focus.html"><code>focus</code> and <code>blur</code></a>) |
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</li> |
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<li> |
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provide abstract events that attach to different DOM events based on |
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the environment (e.g. <a href="touch.html#move"><code>gesturemovestart</code> |
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and family</a>) |
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</li> |
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<li> |
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create events with different subscription signatures (e.g. |
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<a href="hover.html"><code>hover</code></a>) |
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</li> |
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<li> |
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create configurable events that only execute subscribers when |
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criteria passed during subscription are met (e.g. |
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<a href="touch.html#flick"><code>flick</code></a> or |
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<a href="key.html"><code>key</code></a>) |
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</li> |
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<li> |
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create events that encapsulate common UX patterns (e.g. |
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<a href="outside.html"><code>clickoutside</code></a>) |
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</li> |
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<li> |
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create fun little easter eggs (e.g. <a |
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href="http://yuilibrary.com/gallery/show/event-konami"><code>konami</code></a>) |
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</li> |
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<li>and more...</li> |
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</ul> |
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</div> |
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<h2 id="the-hooks">The hooks</h2> |
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<p>Synthetic events hook into the subscription binding and unbinding methods. Specifically:</p> |
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<ol> |
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<li><code>node.on("eventName", ...)</code>, <code>Y.on("eventName", ...)</code>, <a href="index.html#one-time-subscriptions">and family</a></li> |
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<li><code>node.delegate("eventName", ...)</code> or <code>Y.delegate("eventName", ...)</code></li> |
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<li><code>node.detach(...)</code> or <code>subscription.detach()</code></li> |
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</ol> |
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<p>With the exception of a separate <code>detachDelegate()</code> method, the names used when defining synthetic events are the same as these basic methods.</p> |
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<pre class="code prettyprint">Y.Event.define("tripleclick", { |
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on: function (node, subscription, notifier) { |
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// called in response to individual subscriptions |
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}, |
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delegate: function (node, subscription, notifier, filter) { |
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// called in response to delegate subscriptions |
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}, |
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detach: function (node, subscription, notifier) { |
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// called when individual subscriptions are detached in any way |
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}, |
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detachDelegate: function (node, subscription, notifier) { |
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// called when delegate subscriptions are detached in any way |
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} |
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});</pre> |
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<h2 id="subscriptions-and-notifiers">Subscriptions and Notifiers</h2> |
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<p>In addition to the subscribing Node, each method receives a |
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<em>subscription</em> and a <em>notifier</em>. Use the <em>subscription</em> |
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to store event handles or other data that may be needed by another method. Use |
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<em><code>notifier.fire(e)</code></em> to dispatch the event to the callbacks that were |
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bound to it.</p> |
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<pre class="code prettyprint">Y.Event.define("tripleclick", { |
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on: function (node, subscription, notifier) { |
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var count = 0; |
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subscription._handle = node.on("click", function (e) { |
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if (++count === 3) { |
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// Call notifier.fire(e) to execute subscribers. |
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// Pass the triggering event facade to fire() |
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notifier.fire(e); |
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} else { |
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... |
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} |
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}); |
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}, |
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detach: function (node, subscription, notifier) { |
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subscription._handle.detach(); |
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}, |
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delegate: function (node, subscription, notifier, filter) { ... }, |
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detachDelegate: function (node, subscription, notifier) { ... } |
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});</pre> |
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<p>Subscribers to the synthetic event should receive a <code>DOMEventFacade</code>. The |
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easiest way to provide one is to pass the triggering DOM event's facade to |
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<code>notifier.fire(e)</code>. The facade's <code>e.type</code> will be updated to the name of the |
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synth. You will also have the opportunity to add extra data to the event |
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before dispatching to the subscription callbacks.</p> |
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<pre class="code prettyprint">Y.Event.define('multiclick', { |
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on: function (node, sub, notifier) { |
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var count = 0, |
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timer; |
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sub._handle = node.on('click', function (e) { |
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count++; |
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if (timer) { |
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timer.cancel(); |
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} |
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timer = Y.later(200, null, function () { |
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e.clicks = count; |
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count = 0; |
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// subscribers will get e with e.type == 'multiclick' |
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// and extra property e.clicks |
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notifier.fire(e); |
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}); |
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}); |
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}, |
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... |
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});</pre> |
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<h2 id="delegation-support">Delegation support</h2> |
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<p>The <code>delegate</code> function implementation takes an extra argument, the <code>filter</code> that was passed <code>node.delegate(type, callback, <em>HERE</em>)</code>. It's your responsibility to make sense of this filter for your event.</p> |
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<p>Typically, it is just passed along to a <code>node.delegate(...)</code> call against another event, deferring the filtration to the core <code>delegate()</code> method.</p> |
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<pre class="code prettyprint">Y.Event.define("tripleclick", { |
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on: function (node, subscription, notifier) { ... }, |
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detach: function (node, subscription, notifier) { ... }, |
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delegate: function (node, subscription, notifier, filter) { |
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var activeNode = null, |
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count = 0, |
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timer; |
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subscription._handle = node.delegate("click", function (e) { |
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if (timer) { |
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timer.cancel(); |
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} |
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if (this !== activeNode) { |
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activeNode = this; |
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count = 0; |
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} |
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if (++count === 3) { |
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// Call notifier.fire(e) just as with `on` |
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notifier.fire(e); |
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} else { |
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timer = Y.later(300, null, function () { |
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count = 0; |
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}); |
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} |
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}, filter); // filter is passed on to the underlying `delegate()` call |
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}, |
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detachDelegate: function (node, subscription, notifier) { |
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subscription._handle.detach(); |
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} |
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});</pre> |
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<h2 id="extra-arguments">Extra Arguments</h2> |
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<p>Supply a <code>processArgs</code> method in the event definition to support a custom |
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subscription signature. The method receives two arguments:</p> |
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<ol> |
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<li>an array of the subscription arguments for analysis</li> |
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<li> |
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a boolean <code>true</code> if the subscription is being made through |
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<code>delegate(...)</code> |
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</li> |
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</ol> |
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<p>If this method is supplied, it</p> |
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<ul> |
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<li> |
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<strong>MUST</strong> remove the extra arguments from the arg array |
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that is passed in, and |
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</li> |
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<li> |
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<strong>SHOULD</strong> return the extra data relevant to the |
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subscription. |
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</li> |
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</ul> |
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<p>The same <code>processArgs</code> method is used by both <code>on</code> and <code>delegate</code>, but there |
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are various signatures to account for. The easiest way to accept extra |
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arguments is to require them from index 3 in the argument list. It's also best |
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to limit the number of extra arguments to one and require an object literal to |
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allow for future changes.</p> |
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<pre class="code prettyprint">// for an event that takes one extra param |
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processArgs: function (args, isDelegate) { |
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var extra = args[3]; |
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// remove the extra arguments from the array |
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args.splice(3,1); |
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return extra; |
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} |
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// for an event that takes three extra args |
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processArgs: function (args, isDelegate) { |
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return args.splice(3,3); |
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}</pre> |
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<p>Requiring extra params start at index 3 of the <code>args</code> array results in the |
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following subscription signatures:</p> |
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<pre class="code prettyprint">var extraConfig = { ... }; |
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// Third argument for node.on() and node.delegate |
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node.on('extraArgEvent', callback, extraConfig, thisOverride, arg...); |
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node.delegate('extraArgEvent', callback, extraConfig, filter, thisOverride, arg...); |
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// Fourth argument for Y.on() and Y.delegate |
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Y.on('extraArgEvent', callback, targetSelector, extraConfig, thisOverride, arg...); |
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Y.delegate('extraArgEvent', callback, parentSelector, extraConfig, filter, thisOverride, arg...);</pre> |
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<p>For some custom signatures, the placement of the extra argument for |
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implementers using <code>Y.on()</code> or <code>Y.delegate()</code> may look awkward. Sometimes you |
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can support extras at other indexes if you can reliably tell that the argument |
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is not part of |
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<a href="index.html#binding-this-and-additional-callback-arguments">the extended |
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signature for <code>on(...)</code> or <code>delegate(...)</code></a>. See the <a |
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href="http://yuilibrary.com/yui/docs/api/files/event_js_hover.js.html">source for the "hover" |
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event</a> for an example of supporting multiple signatures.</p> |
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<p>The return value of <code>processArgs</code> is assigned to <code>subscription._extras</code> for the <code>on</code> and <code>delegate</code> definition methods.</p> |
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<pre class="code prettyprint">Y.Event.define('multiclick', { |
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processArgs: function (args, isDelegate) { |
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// The args list will look like this coming in: |
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// [ type, callback, node, (extras...), [filter,] thisObj, arg0...argN ] |
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return args.splice(3,1)[1] || {}; |
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}, |
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// Custom subscription signatures don't change the params of on/delegate |
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on: function (node, sub, notifier) { |
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var clicks = 0, |
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// data returned from processArgs is available at sub._extras |
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min = sub._extras.minClicks || 3, |
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max = sub._extras.maxClicks || 10, |
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timer; |
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sub._handle = node.on('click', function (e) { |
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if (timer) { |
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timer.cancel(); |
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} |
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if (++clicks === max) { |
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e.clicks = clicks; |
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notifier.fire(e); |
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} else { |
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timer = Y.later(200, null, function () { |
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if (clicks > min) { |
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e.clicks = count; |
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notifier.fire(e); |
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} |
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count = 0; |
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}); |
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} |
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}); |
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}, |
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... |
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});</pre> |
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<p>Usage of this synthetic event then expects a third argument as a |
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configuration object with <code>minClicks</code> and <code>maxClicks</code> properties.</p> |
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<pre class="code prettyprint">node.on('multiclick', obj.method, { |
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minClicks: 5, |
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maxClicks: 8 |
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}, obj); |
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// extra args are supplied before the delegate filter |
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container.delegate('multiclick', doSomething, { |
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minClicks: 3, |
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maxClicks: 55 |
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}, '.clickable');</pre> |
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<h2 id="a-tip-to-make-your-synth-definition-smaller">A Tip to Make Your Synth Definition Smaller</h2> |
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<p>If the only difference between your <code>on</code> and <code>delegate</code> definitions is which method is used to bind to the supporting events, then you can propably get away with defining <code>delegate</code> and aliasing it to <code>on</code> (and so with <code>detach</code> and <code>detachDelegate</code>). See the |
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<a href="http://yuilibrary.com/yui/docs/api/files/event_js_hover.js.html">source for the "hover" |
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event</a> for an example of this approach.</p> |
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</div> |
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</div> |
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</div> |
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<div class="yui3-u-1-4"> |
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<div class="sidebar"> |
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<div id="toc" class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Table of Contents</h2> |
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</div> |
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<div class="bd"> |
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<ul class="toc"> |
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<li> |
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<a href="#the-hooks">The hooks</a> |
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</li> |
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<li> |
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<a href="#subscriptions-and-notifiers">Subscriptions and Notifiers</a> |
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</li> |
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<li> |
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<a href="#delegation-support">Delegation support</a> |
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</li> |
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<li> |
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<a href="#extra-arguments">Extra Arguments</a> |
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</li> |
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<li> |
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<a href="#a-tip-to-make-your-synth-definition-smaller">A Tip to Make Your Synth Definition Smaller</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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<div class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Examples</h2> |
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</div> |
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<div class="bd"> |
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<ul class="examples"> |
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<li data-description="Use the Event Utility to attach simple DOM event handlers."> |
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<a href="basic-example.html">Simple DOM Events</a> |
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</li> |
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<li data-description="Using the synthetic event API to create a DOM event that fires in response to arrow keys being pressed."> |
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<a href="synth-example.html">Creating an Arrow Event for DOM Subscription</a> |
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</li> |
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<li data-description="Supporting cross-device swipe gestures, using the event-move gesture events"> |
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<a href="swipe-example.html">Supporting A Swipe Left Gesture</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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<div class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Examples That Use This Component</h2> |
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</div> |
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<div class="bd"> |
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<ul class="examples"> |
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<li data-description="Creating an accessible menu button using the Focus Manager Node Plugin, Event's delegation support and mouseenter event, along with the Overlay widget and Node's support for the WAI-ARIA Roles and States."> |
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<a href="../node-focusmanager/node-focusmanager-button.html">Accessible Menu Button</a> |
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</li> |
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<li data-description="Shows how to extend the base widget class, to create your own Widgets."> |
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<a href="../widget/widget-extend.html">Extending the Base Widget Class</a> |
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</li> |
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<li data-description="Example Photo Browser application."> |
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<a href="../dd/photo-browser.html">Photo Browser</a> |
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</li> |
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<li data-description="Portal style example using Drag & Drop Event Bubbling and Animation."> |
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<a href="../dd/portal-drag.html">Portal Style Example</a> |
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</li> |
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<li data-description="Use IO to request data over HTTP."> |
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<a href="../io/get.html">HTTP GET to request data</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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<script src="../assets/vendor/prettify/prettify-min.js"></script> |
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<script>prettyPrint();</script> |
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<script> |
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YUI.Env.Tests = { |
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examples: [], |
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project: '../assets', |
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assets: '../assets/event', |
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name: 'event', |
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title: 'Creating Synthetic Events', |
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newWindow: '', |
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auto: false |
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}; |
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YUI.Env.Tests.examples.push('basic-example'); |
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YUI.Env.Tests.examples.push('synth-example'); |
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YUI.Env.Tests.examples.push('swipe-example'); |
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YUI.Env.Tests.examples.push('node-focusmanager-button'); |
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YUI.Env.Tests.examples.push('widget-extend'); |
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YUI.Env.Tests.examples.push('photo-browser'); |
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YUI.Env.Tests.examples.push('portal-drag'); |
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YUI.Env.Tests.examples.push('get'); |
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</script> |
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<script src="../assets/yui/test-runner.js"></script> |
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</body> |
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</html> |