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JT Smith 20f8df1291 upgrading to YUI 2.6
data tables are going to need some work yet, but the other stuff seems to be working 100%
2008-10-22 23:53:29 +00:00

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<title>API: event EventProvider.js (YUI Library)</title>
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<a href="http://developer.yahoo.com/yui/"><h1>Yahoo! UI Library</h1></a>
<h3>Event Utility&nbsp; <span class="subtitle">2.6.0</span></h3>
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<a href="./index.html">Yahoo! UI Library</a>
&gt; <a href="./module_event.html">event</a>
&gt; EventProvider.js (source view)
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<div class="highlight" ><pre><span class="c">/**</span>
<span class="c"> * EventProvider is designed to be used with YAHOO.augment to wrap </span>
<span class="c"> * CustomEvents in an interface that allows events to be subscribed to </span>
<span class="c"> * and fired by name. This makes it possible for implementing code to</span>
<span class="c"> * subscribe to an event that either has not been created yet, or will</span>
<span class="c"> * not be created at all.</span>
<span class="c"> *</span>
<span class="c"> * @Class EventProvider</span>
<span class="c"> */</span>
<span class="nx">YAHOO</span><span class="o">.</span><span class="nx">util</span><span class="o">.</span><span class="nx">EventProvider</span> <span class="o">=</span> <span class="k">function</span><span class="o">()</span> <span class="o">{</span> <span class="o">};</span>
<span class="nx">YAHOO</span><span class="o">.</span><span class="nx">util</span><span class="o">.</span><span class="nx">EventProvider</span><span class="o">.</span><span class="nx">prototype</span> <span class="o">=</span> <span class="o">{</span>
<span class="c">/**</span>
<span class="c"> * Private storage of custom events</span>
<span class="c"> * @property __yui_events</span>
<span class="c"> * @type Object[]</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">__yui_events</span><span class="o">:</span> <span class="kc">null</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Private storage of custom event subscribers</span>
<span class="c"> * @property __yui_subscribers</span>
<span class="c"> * @type Object[]</span>
<span class="c"> * @private</span>
<span class="c"> */</span>
<span class="nx">__yui_subscribers</span><span class="o">:</span> <span class="kc">null</span><span class="o">,</span>
<span class="c">/**</span>
<span class="c"> * Subscribe to a CustomEvent by event type</span>
<span class="c"> *</span>
<span class="c"> * @method subscribe</span>
<span class="c"> * @param p_type {string} the type, or name of the event</span>
<span class="c"> * @param p_fn {function} the function to exectute when the event fires</span>
<span class="c"> * @param p_obj {Object} An object to be passed along when the event </span>
<span class="c"> * fires</span>
<span class="c"> * @param p_override {boolean} If true, the obj passed in becomes the </span>
<span class="c"> * execution scope of the listener</span>
<span class="c"> */</span>
<span class="nx">subscribe</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">p_type</span><span class="o">,</span> <span class="nx">p_fn</span><span class="o">,</span> <span class="nx">p_obj</span><span class="o">,</span> <span class="nx">p_override</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">ce</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span><span class="o">[</span><span class="nx">p_type</span><span class="o">];</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">ce</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">ce</span><span class="o">.</span><span class="nx">subscribe</span><span class="o">(</span><span class="nx">p_fn</span><span class="o">,</span> <span class="nx">p_obj</span><span class="o">,</span> <span class="nx">p_override</span><span class="o">);</span>
<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">__yui_subscribers</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_subscribers</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">subs</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_subscribers</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">subs</span><span class="o">[</span><span class="nx">p_type</span><span class="o">])</span> <span class="o">{</span>
<span class="nx">subs</span><span class="o">[</span><span class="nx">p_type</span><span class="o">]</span> <span class="o">=</span> <span class="o">[];</span>
<span class="o">}</span>
<span class="nx">subs</span><span class="o">[</span><span class="nx">p_type</span><span class="o">].</span><span class="nx">push</span><span class="o">(</span>
<span class="o">{</span> <span class="nx">fn</span><span class="o">:</span> <span class="nx">p_fn</span><span class="o">,</span> <span class="nx">obj</span><span class="o">:</span> <span class="nx">p_obj</span><span class="o">,</span> <span class="nx">override</span><span class="o">:</span> <span class="nx">p_override</span> <span class="o">}</span> <span class="o">);</span>
<span class="o">}</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Unsubscribes one or more listeners the from the specified event</span>
<span class="c"> * @method unsubscribe</span>
<span class="c"> * @param p_type {string} The type, or name of the event. If the type</span>
<span class="c"> * is not specified, it will attempt to remove</span>
<span class="c"> * the listener from all hosted events.</span>
<span class="c"> * @param p_fn {Function} The subscribed function to unsubscribe, if not</span>
<span class="c"> * supplied, all subscribers will be removed.</span>
<span class="c"> * @param p_obj {Object} The custom object passed to subscribe. This is</span>
<span class="c"> * optional, but if supplied will be used to</span>
<span class="c"> * disambiguate multiple listeners that are the same</span>
<span class="c"> * (e.g., you subscribe many object using a function</span>
<span class="c"> * that lives on the prototype)</span>
<span class="c"> * @return {boolean} true if the subscriber was found and detached.</span>
<span class="c"> */</span>
<span class="nx">unsubscribe</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">p_type</span><span class="o">,</span> <span class="nx">p_fn</span><span class="o">,</span> <span class="nx">p_obj</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">evts</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">p_type</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">ce</span> <span class="o">=</span> <span class="nx">evts</span><span class="o">[</span><span class="nx">p_type</span><span class="o">];</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">ce</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">ce</span><span class="o">.</span><span class="nx">unsubscribe</span><span class="o">(</span><span class="nx">p_fn</span><span class="o">,</span> <span class="nx">p_obj</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">ret</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
<span class="k">for</span> <span class="o">(</span><span class="k">var</span> <span class="nx">i</span> <span class="k">in</span> <span class="nx">evts</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">YAHOO</span><span class="o">.</span><span class="nx">lang</span><span class="o">.</span><span class="nx">hasOwnProperty</span><span class="o">(</span><span class="nx">evts</span><span class="o">,</span> <span class="nx">i</span><span class="o">))</span> <span class="o">{</span>
<span class="nx">ret</span> <span class="o">=</span> <span class="nx">ret</span> <span class="o">&amp;&amp;</span> <span class="nx">evts</span><span class="o">[</span><span class="nx">i</span><span class="o">].</span><span class="nx">unsubscribe</span><span class="o">(</span><span class="nx">p_fn</span><span class="o">,</span> <span class="nx">p_obj</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="k">return</span> <span class="nx">ret</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Removes all listeners from the specified event. If the event type</span>
<span class="c"> * is not specified, all listeners from all hosted custom events will</span>
<span class="c"> * be removed.</span>
<span class="c"> * @method unsubscribeAll</span>
<span class="c"> * @param p_type {string} The type, or name of the event</span>
<span class="c"> */</span>
<span class="nx">unsubscribeAll</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">p_type</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="k">this</span><span class="o">.</span><span class="nx">unsubscribe</span><span class="o">(</span><span class="nx">p_type</span><span class="o">);</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Creates a new custom event of the specified type. If a custom event</span>
<span class="c"> * by that name already exists, it will not be re-created. In either</span>
<span class="c"> * case the custom event is returned. </span>
<span class="c"> *</span>
<span class="c"> * @method createEvent</span>
<span class="c"> *</span>
<span class="c"> * @param p_type {string} the type, or name of the event</span>
<span class="c"> * @param p_config {object} optional config params. Valid properties are:</span>
<span class="c"> *</span>
<span class="c"> * &lt;ul&gt;</span>
<span class="c"> * &lt;li&gt;</span>
<span class="c"> * scope: defines the default execution scope. If not defined</span>
<span class="c"> * the default scope will be this instance.</span>
<span class="c"> * &lt;/li&gt;</span>
<span class="c"> * &lt;li&gt;</span>
<span class="c"> * silent: if true, the custom event will not generate log messages.</span>
<span class="c"> * This is false by default.</span>
<span class="c"> * &lt;/li&gt;</span>
<span class="c"> * &lt;li&gt;</span>
<span class="c"> * onSubscribeCallback: specifies a callback to execute when the</span>
<span class="c"> * event has a new subscriber. This will fire immediately for</span>
<span class="c"> * each queued subscriber if any exist prior to the creation of</span>
<span class="c"> * the event.</span>
<span class="c"> * &lt;/li&gt;</span>
<span class="c"> * &lt;/ul&gt;</span>
<span class="c"> *</span>
<span class="c"> * @return {CustomEvent} the custom event</span>
<span class="c"> *</span>
<span class="c"> */</span>
<span class="nx">createEvent</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">p_type</span><span class="o">,</span> <span class="nx">p_config</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">opts</span> <span class="o">=</span> <span class="nx">p_config</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">events</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">events</span><span class="o">[</span><span class="nx">p_type</span><span class="o">])</span> <span class="o">{</span>
<span class="nx">YAHOO</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s2">&quot;EventProvider createEvent skipped: &#39;&quot;</span><span class="o">+</span><span class="nx">p_type</span><span class="o">+</span><span class="s2">&quot;&#39; already exists&quot;</span><span class="o">);</span>
<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">scope</span> <span class="o">=</span> <span class="nx">opts</span><span class="o">.</span><span class="nx">scope</span> <span class="o">||</span> <span class="k">this</span><span class="o">;</span>
<span class="k">var</span> <span class="nx">silent</span> <span class="o">=</span> <span class="o">(</span><span class="nx">opts</span><span class="o">.</span><span class="nx">silent</span><span class="o">);</span>
<span class="k">var</span> <span class="nx">ce</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">YAHOO</span><span class="o">.</span><span class="nx">util</span><span class="o">.</span><span class="nx">CustomEvent</span><span class="o">(</span><span class="nx">p_type</span><span class="o">,</span> <span class="nx">scope</span><span class="o">,</span> <span class="nx">silent</span><span class="o">,</span>
<span class="nx">YAHOO</span><span class="o">.</span><span class="nx">util</span><span class="o">.</span><span class="nx">CustomEvent</span><span class="o">.</span><span class="nx">FLAT</span><span class="o">);</span>
<span class="nx">events</span><span class="o">[</span><span class="nx">p_type</span><span class="o">]</span> <span class="o">=</span> <span class="nx">ce</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">opts</span><span class="o">.</span><span class="nx">onSubscribeCallback</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">ce</span><span class="o">.</span><span class="nx">subscribeEvent</span><span class="o">.</span><span class="nx">subscribe</span><span class="o">(</span><span class="nx">opts</span><span class="o">.</span><span class="nx">onSubscribeCallback</span><span class="o">);</span>
<span class="o">}</span>
<span class="k">this</span><span class="o">.</span><span class="nx">__yui_subscribers</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_subscribers</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">qs</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_subscribers</span><span class="o">[</span><span class="nx">p_type</span><span class="o">];</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">qs</span><span class="o">)</span> <span class="o">{</span>
<span class="k">for</span> <span class="o">(</span><span class="k">var</span> <span class="nx">i</span><span class="o">=</span><span class="m">0</span><span class="o">;</span> <span class="nx">i</span><span class="o">&lt;</span><span class="nx">qs</span><span class="o">.</span><span class="nx">length</span><span class="o">;</span> <span class="o">++</span><span class="nx">i</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">ce</span><span class="o">.</span><span class="nx">subscribe</span><span class="o">(</span><span class="nx">qs</span><span class="o">[</span><span class="nx">i</span><span class="o">].</span><span class="nx">fn</span><span class="o">,</span> <span class="nx">qs</span><span class="o">[</span><span class="nx">i</span><span class="o">].</span><span class="nx">obj</span><span class="o">,</span> <span class="nx">qs</span><span class="o">[</span><span class="nx">i</span><span class="o">].</span><span class="nx">override</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="k">return</span> <span class="nx">events</span><span class="o">[</span><span class="nx">p_type</span><span class="o">];</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Fire a custom event by name. The callback functions will be executed</span>
<span class="c"> * from the scope specified when the event was created, and with the </span>
<span class="c"> * following parameters:</span>
<span class="c"> * &lt;ul&gt;</span>
<span class="c"> * &lt;li&gt;The first argument fire() was executed with&lt;/li&gt;</span>
<span class="c"> * &lt;li&gt;The custom object (if any) that was passed into the subscribe() </span>
<span class="c"> * method&lt;/li&gt;</span>
<span class="c"> * &lt;/ul&gt;</span>
<span class="c"> * @method fireEvent</span>
<span class="c"> * @param p_type {string} the type, or name of the event</span>
<span class="c"> * @param arguments {Object*} an arbitrary set of parameters to pass to </span>
<span class="c"> * the handler.</span>
<span class="c"> * @return {boolean} the return value from CustomEvent.fire</span>
<span class="c"> * </span>
<span class="c"> */</span>
<span class="nx">fireEvent</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">p_type</span><span class="o">,</span> <span class="nx">arg1</span><span class="o">,</span> <span class="nx">arg2</span><span class="o">,</span> <span class="nx">etc</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span> <span class="o">||</span> <span class="o">{};</span>
<span class="k">var</span> <span class="nx">ce</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span><span class="o">[</span><span class="nx">p_type</span><span class="o">];</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">ce</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">YAHOO</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="nx">p_type</span> <span class="o">+</span> <span class="s2">&quot;event fired before it was created.&quot;</span><span class="o">);</span>
<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">var</span> <span class="nx">args</span> <span class="o">=</span> <span class="o">[];</span>
<span class="k">for</span> <span class="o">(</span><span class="k">var</span> <span class="nx">i</span><span class="o">=</span><span class="m">1</span><span class="o">;</span> <span class="nx">i</span><span class="o">&lt;</span><span class="nx">arguments</span><span class="o">.</span><span class="nx">length</span><span class="o">;</span> <span class="o">++</span><span class="nx">i</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">args</span><span class="o">.</span><span class="nx">push</span><span class="o">(</span><span class="nx">arguments</span><span class="o">[</span><span class="nx">i</span><span class="o">]);</span>
<span class="o">}</span>
<span class="k">return</span> <span class="nx">ce</span><span class="o">.</span><span class="nx">fire</span><span class="o">.</span><span class="nx">apply</span><span class="o">(</span><span class="nx">ce</span><span class="o">,</span> <span class="nx">args</span><span class="o">);</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Returns true if the custom event of the provided type has been created</span>
<span class="c"> * with createEvent.</span>
<span class="c"> * @method hasEvent</span>
<span class="c"> * @param type {string} the type, or name of the event</span>
<span class="c"> */</span>
<span class="nx">hasEvent</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">type</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="nx">__yui_events</span><span class="o">[</span><span class="nx">type</span><span class="o">])</span> <span class="o">{</span>
<span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">};</span>
</pre></div>
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<h4>Modules</h4>
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<li class=""><a href="module_autocomplete.html">autocomplete</a></li>
<li class=""><a href="module_button.html">button</a></li>
<li class=""><a href="module_calendar.html">calendar</a></li>
<li class=""><a href="module_carousel.html">carousel</a></li>
<li class=""><a href="module_charts.html">charts</a></li>
<li class=""><a href="module_colorpicker.html">colorpicker</a></li>
<li class=""><a href="module_connection.html">connection</a></li>
<li class=""><a href="module_container.html">container</a></li>
<li class=""><a href="module_cookie.html">cookie</a></li>
<li class=""><a href="module_datasource.html">datasource</a></li>
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<li class=""><a href="module_dragdrop.html">dragdrop</a></li>
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<li class=""><a href="module_json.html">json</a></li>
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</ul>
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<h4>Files</h4>
<ul class="content">
<li class=""><a href="CustomEvent.js.html">CustomEvent.js</a></li>
<li class=""><a href="Event.js.html">Event.js</a></li>
<li class="selected"><a href="EventProvider.js.html">EventProvider.js</a></li>
<li class=""><a href="KeyListener.js.html">KeyListener.js</a></li>
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