1 | /*! |
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2 | * Ext JS Library 3.4.0 |
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3 | * Copyright(c) 2006-2011 Sencha Inc. |
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4 | * licensing@sencha.com |
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5 | * http://www.sencha.com/license |
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6 | */ |
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7 | (function(){ |
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8 | |
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9 | var EXTUTIL = Ext.util, |
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10 | EACH = Ext.each, |
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11 | TRUE = true, |
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12 | FALSE = false; |
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13 | /** |
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14 | * @class Ext.util.Observable |
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15 | * Base class that provides a common interface for publishing events. Subclasses are expected to |
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16 | * to have a property "events" with all the events defined, and, optionally, a property "listeners" |
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17 | * with configured listeners defined.<br> |
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18 | * For example: |
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19 | * <pre><code> |
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20 | Employee = Ext.extend(Ext.util.Observable, { |
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21 | constructor: function(config){ |
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22 | this.name = config.name; |
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23 | this.addEvents({ |
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24 | "fired" : true, |
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25 | "quit" : true |
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26 | }); |
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27 | |
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28 | // Copy configured listeners into *this* object so that the base class's |
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29 | // constructor will add them. |
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30 | this.listeners = config.listeners; |
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31 | |
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32 | // Call our superclass constructor to complete construction process. |
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33 | Employee.superclass.constructor.call(this, config) |
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34 | } |
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35 | }); |
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36 | </code></pre> |
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37 | * This could then be used like this:<pre><code> |
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38 | var newEmployee = new Employee({ |
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39 | name: employeeName, |
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40 | listeners: { |
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41 | quit: function() { |
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42 | // By default, "this" will be the object that fired the event. |
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43 | alert(this.name + " has quit!"); |
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44 | } |
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45 | } |
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46 | }); |
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47 | </code></pre> |
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48 | */ |
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49 | EXTUTIL.Observable = function(){ |
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50 | /** |
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51 | * @cfg {Object} listeners (optional) <p>A config object containing one or more event handlers to be added to this |
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52 | * object during initialization. This should be a valid listeners config object as specified in the |
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53 | * {@link #addListener} example for attaching multiple handlers at once.</p> |
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54 | * <br><p><b><u>DOM events from ExtJs {@link Ext.Component Components}</u></b></p> |
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55 | * <br><p>While <i>some</i> ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this |
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56 | * is usually only done when extra value can be added. For example the {@link Ext.DataView DataView}'s |
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57 | * <b><code>{@link Ext.DataView#click click}</code></b> event passing the node clicked on. To access DOM |
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58 | * events directly from a Component's HTMLElement, listeners must be added to the <i>{@link Ext.Component#getEl Element}</i> after the Component |
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59 | * has been rendered. A plugin can simplify this step:<pre><code> |
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60 | // Plugin is configured with a listeners config object. |
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61 | // The Component is appended to the argument list of all handler functions. |
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62 | Ext.DomObserver = Ext.extend(Object, { |
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63 | constructor: function(config) { |
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64 | this.listeners = config.listeners ? config.listeners : config; |
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65 | }, |
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66 | |
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67 | // Component passes itself into plugin's init method |
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68 | init: function(c) { |
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69 | var p, l = this.listeners; |
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70 | for (p in l) { |
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71 | if (Ext.isFunction(l[p])) { |
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72 | l[p] = this.createHandler(l[p], c); |
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73 | } else { |
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74 | l[p].fn = this.createHandler(l[p].fn, c); |
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75 | } |
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76 | } |
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77 | |
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78 | // Add the listeners to the Element immediately following the render call |
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79 | c.render = c.render.{@link Function#createSequence createSequence}(function() { |
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80 | var e = c.getEl(); |
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81 | if (e) { |
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82 | e.on(l); |
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83 | } |
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84 | }); |
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85 | }, |
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86 | |
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87 | createHandler: function(fn, c) { |
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88 | return function(e) { |
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89 | fn.call(this, e, c); |
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90 | }; |
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91 | } |
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92 | }); |
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93 | |
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94 | var combo = new Ext.form.ComboBox({ |
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95 | |
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96 | // Collapse combo when its element is clicked on |
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97 | plugins: [ new Ext.DomObserver({ |
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98 | click: function(evt, comp) { |
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99 | comp.collapse(); |
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100 | } |
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101 | })], |
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102 | store: myStore, |
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103 | typeAhead: true, |
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104 | mode: 'local', |
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105 | triggerAction: 'all' |
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106 | }); |
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107 | * </code></pre></p> |
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108 | */ |
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109 | var me = this, e = me.events; |
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110 | if(me.listeners){ |
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111 | me.on(me.listeners); |
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112 | delete me.listeners; |
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113 | } |
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114 | me.events = e || {}; |
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115 | }; |
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116 | |
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117 | EXTUTIL.Observable.prototype = { |
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118 | // private |
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119 | filterOptRe : /^(?:scope|delay|buffer|single)$/, |
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120 | |
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121 | /** |
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122 | * <p>Fires the specified event with the passed parameters (minus the event name).</p> |
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123 | * <p>An event may be set to bubble up an Observable parent hierarchy (See {@link Ext.Component#getBubbleTarget}) |
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124 | * by calling {@link #enableBubble}.</p> |
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125 | * @param {String} eventName The name of the event to fire. |
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126 | * @param {Object...} args Variable number of parameters are passed to handlers. |
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127 | * @return {Boolean} returns false if any of the handlers return false otherwise it returns true. |
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128 | */ |
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129 | fireEvent : function(){ |
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130 | var a = Array.prototype.slice.call(arguments, 0), |
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131 | ename = a[0].toLowerCase(), |
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132 | me = this, |
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133 | ret = TRUE, |
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134 | ce = me.events[ename], |
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135 | cc, |
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136 | q, |
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137 | c; |
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138 | if (me.eventsSuspended === TRUE) { |
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139 | if (q = me.eventQueue) { |
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140 | q.push(a); |
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141 | } |
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142 | } |
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143 | else if(typeof ce == 'object') { |
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144 | if (ce.bubble){ |
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145 | if(ce.fire.apply(ce, a.slice(1)) === FALSE) { |
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146 | return FALSE; |
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147 | } |
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148 | c = me.getBubbleTarget && me.getBubbleTarget(); |
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149 | if(c && c.enableBubble) { |
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150 | cc = c.events[ename]; |
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151 | if(!cc || typeof cc != 'object' || !cc.bubble) { |
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152 | c.enableBubble(ename); |
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153 | } |
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154 | return c.fireEvent.apply(c, a); |
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155 | } |
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156 | } |
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157 | else { |
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158 | a.shift(); |
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159 | ret = ce.fire.apply(ce, a); |
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160 | } |
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161 | } |
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162 | return ret; |
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163 | }, |
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164 | |
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165 | /** |
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166 | * Appends an event handler to this object. |
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167 | * @param {String} eventName The name of the event to listen for. |
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168 | * @param {Function} handler The method the event invokes. |
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169 | * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed. |
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170 | * <b>If omitted, defaults to the object which fired the event.</b> |
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171 | * @param {Object} options (optional) An object containing handler configuration. |
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172 | * properties. This may contain any of the following properties:<ul> |
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173 | * <li><b>scope</b> : Object<div class="sub-desc">The scope (<code><b>this</b></code> reference) in which the handler function is executed. |
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174 | * <b>If omitted, defaults to the object which fired the event.</b></div></li> |
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175 | * <li><b>delay</b> : Number<div class="sub-desc">The number of milliseconds to delay the invocation of the handler after the event fires.</div></li> |
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176 | * <li><b>single</b> : Boolean<div class="sub-desc">True to add a handler to handle just the next firing of the event, and then remove itself.</div></li> |
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177 | * <li><b>buffer</b> : Number<div class="sub-desc">Causes the handler to be scheduled to run in an {@link Ext.util.DelayedTask} delayed |
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178 | * by the specified number of milliseconds. If the event fires again within that time, the original |
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179 | * handler is <em>not</em> invoked, but the new handler is scheduled in its place.</div></li> |
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180 | * <li><b>target</b> : Observable<div class="sub-desc">Only call the handler if the event was fired on the target Observable, <i>not</i> |
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181 | * if the event was bubbled up from a child Observable.</div></li> |
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182 | * </ul><br> |
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183 | * <p> |
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184 | * <b>Combining Options</b><br> |
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185 | * Using the options argument, it is possible to combine different types of listeners:<br> |
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186 | * <br> |
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187 | * A delayed, one-time listener. |
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188 | * <pre><code> |
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189 | myDataView.on('click', this.onClick, this, { |
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190 | single: true, |
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191 | delay: 100 |
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192 | });</code></pre> |
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193 | * <p> |
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194 | * <b>Attaching multiple handlers in 1 call</b><br> |
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195 | * The method also allows for a single argument to be passed which is a config object containing properties |
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196 | * which specify multiple handlers. |
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197 | * <p> |
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198 | * <pre><code> |
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199 | myGridPanel.on({ |
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200 | 'click' : { |
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201 | fn: this.onClick, |
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202 | scope: this, |
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203 | delay: 100 |
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204 | }, |
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205 | 'mouseover' : { |
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206 | fn: this.onMouseOver, |
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207 | scope: this |
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208 | }, |
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209 | 'mouseout' : { |
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210 | fn: this.onMouseOut, |
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211 | scope: this |
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212 | } |
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213 | });</code></pre> |
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214 | * <p> |
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215 | * Or a shorthand syntax:<br> |
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216 | * <pre><code> |
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217 | myGridPanel.on({ |
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218 | 'click' : this.onClick, |
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219 | 'mouseover' : this.onMouseOver, |
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220 | 'mouseout' : this.onMouseOut, |
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221 | scope: this |
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222 | });</code></pre> |
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223 | */ |
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224 | addListener : function(eventName, fn, scope, o){ |
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225 | var me = this, |
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226 | e, |
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227 | oe, |
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228 | ce; |
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229 | |
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230 | if (typeof eventName == 'object') { |
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231 | o = eventName; |
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232 | for (e in o) { |
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233 | oe = o[e]; |
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234 | if (!me.filterOptRe.test(e)) { |
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235 | me.addListener(e, oe.fn || oe, oe.scope || o.scope, oe.fn ? oe : o); |
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236 | } |
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237 | } |
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238 | } else { |
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239 | eventName = eventName.toLowerCase(); |
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240 | ce = me.events[eventName] || TRUE; |
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241 | if (typeof ce == 'boolean') { |
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242 | me.events[eventName] = ce = new EXTUTIL.Event(me, eventName); |
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243 | } |
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244 | ce.addListener(fn, scope, typeof o == 'object' ? o : {}); |
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245 | } |
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246 | }, |
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247 | |
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248 | /** |
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249 | * Removes an event handler. |
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250 | * @param {String} eventName The type of event the handler was associated with. |
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251 | * @param {Function} handler The handler to remove. <b>This must be a reference to the function passed into the {@link #addListener} call.</b> |
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252 | * @param {Object} scope (optional) The scope originally specified for the handler. |
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253 | */ |
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254 | removeListener : function(eventName, fn, scope){ |
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255 | var ce = this.events[eventName.toLowerCase()]; |
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256 | if (typeof ce == 'object') { |
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257 | ce.removeListener(fn, scope); |
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258 | } |
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259 | }, |
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260 | |
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261 | /** |
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262 | * Removes all listeners for this object |
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263 | */ |
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264 | purgeListeners : function(){ |
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265 | var events = this.events, |
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266 | evt, |
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267 | key; |
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268 | for(key in events){ |
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269 | evt = events[key]; |
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270 | if(typeof evt == 'object'){ |
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271 | evt.clearListeners(); |
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272 | } |
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273 | } |
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274 | }, |
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275 | |
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276 | /** |
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277 | * Adds the specified events to the list of events which this Observable may fire. |
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278 | * @param {Object|String} o Either an object with event names as properties with a value of <code>true</code> |
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279 | * or the first event name string if multiple event names are being passed as separate parameters. |
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280 | * @param {string} Optional. Event name if multiple event names are being passed as separate parameters. |
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281 | * Usage:<pre><code> |
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282 | this.addEvents('storeloaded', 'storecleared'); |
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283 | </code></pre> |
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284 | */ |
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285 | addEvents : function(o){ |
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286 | var me = this; |
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287 | me.events = me.events || {}; |
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288 | if (typeof o == 'string') { |
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289 | var a = arguments, |
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290 | i = a.length; |
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291 | while(i--) { |
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292 | me.events[a[i]] = me.events[a[i]] || TRUE; |
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293 | } |
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294 | } else { |
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295 | Ext.applyIf(me.events, o); |
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296 | } |
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297 | }, |
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298 | |
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299 | /** |
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300 | * Checks to see if this object has any listeners for a specified event |
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301 | * @param {String} eventName The name of the event to check for |
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302 | * @return {Boolean} True if the event is being listened for, else false |
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303 | */ |
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304 | hasListener : function(eventName){ |
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305 | var e = this.events[eventName.toLowerCase()]; |
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306 | return typeof e == 'object' && e.listeners.length > 0; |
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307 | }, |
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308 | |
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309 | /** |
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310 | * Suspend the firing of all events. (see {@link #resumeEvents}) |
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311 | * @param {Boolean} queueSuspended Pass as true to queue up suspended events to be fired |
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312 | * after the {@link #resumeEvents} call instead of discarding all suspended events; |
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313 | */ |
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314 | suspendEvents : function(queueSuspended){ |
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315 | this.eventsSuspended = TRUE; |
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316 | if(queueSuspended && !this.eventQueue){ |
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317 | this.eventQueue = []; |
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318 | } |
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319 | }, |
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320 | |
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321 | /** |
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322 | * Resume firing events. (see {@link #suspendEvents}) |
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323 | * If events were suspended using the <tt><b>queueSuspended</b></tt> parameter, then all |
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324 | * events fired during event suspension will be sent to any listeners now. |
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325 | */ |
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326 | resumeEvents : function(){ |
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327 | var me = this, |
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328 | queued = me.eventQueue || []; |
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329 | me.eventsSuspended = FALSE; |
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330 | delete me.eventQueue; |
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331 | EACH(queued, function(e) { |
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332 | me.fireEvent.apply(me, e); |
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333 | }); |
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334 | } |
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335 | }; |
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336 | |
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337 | var OBSERVABLE = EXTUTIL.Observable.prototype; |
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338 | /** |
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339 | * Appends an event handler to this object (shorthand for {@link #addListener}.) |
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340 | * @param {String} eventName The type of event to listen for |
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341 | * @param {Function} handler The method the event invokes |
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342 | * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed. |
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343 | * <b>If omitted, defaults to the object which fired the event.</b> |
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344 | * @param {Object} options (optional) An object containing handler configuration. |
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345 | * @method |
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346 | */ |
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347 | OBSERVABLE.on = OBSERVABLE.addListener; |
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348 | /** |
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349 | * Removes an event handler (shorthand for {@link #removeListener}.) |
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350 | * @param {String} eventName The type of event the handler was associated with. |
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351 | * @param {Function} handler The handler to remove. <b>This must be a reference to the function passed into the {@link #addListener} call.</b> |
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352 | * @param {Object} scope (optional) The scope originally specified for the handler. |
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353 | * @method |
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354 | */ |
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355 | OBSERVABLE.un = OBSERVABLE.removeListener; |
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356 | |
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357 | /** |
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358 | * Removes <b>all</b> added captures from the Observable. |
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359 | * @param {Observable} o The Observable to release |
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360 | * @static |
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361 | */ |
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362 | EXTUTIL.Observable.releaseCapture = function(o){ |
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363 | o.fireEvent = OBSERVABLE.fireEvent; |
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364 | }; |
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365 | |
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366 | function createTargeted(h, o, scope){ |
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367 | return function(){ |
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368 | if(o.target == arguments[0]){ |
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369 | h.apply(scope, Array.prototype.slice.call(arguments, 0)); |
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370 | } |
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371 | }; |
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372 | }; |
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373 | |
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374 | function createBuffered(h, o, l, scope){ |
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375 | l.task = new EXTUTIL.DelayedTask(); |
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376 | return function(){ |
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377 | l.task.delay(o.buffer, h, scope, Array.prototype.slice.call(arguments, 0)); |
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378 | }; |
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379 | }; |
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380 | |
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381 | function createSingle(h, e, fn, scope){ |
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382 | return function(){ |
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383 | e.removeListener(fn, scope); |
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384 | return h.apply(scope, arguments); |
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385 | }; |
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386 | }; |
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387 | |
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388 | function createDelayed(h, o, l, scope){ |
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389 | return function(){ |
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390 | var task = new EXTUTIL.DelayedTask(), |
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391 | args = Array.prototype.slice.call(arguments, 0); |
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392 | if(!l.tasks) { |
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393 | l.tasks = []; |
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394 | } |
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395 | l.tasks.push(task); |
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396 | task.delay(o.delay || 10, function(){ |
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397 | l.tasks.remove(task); |
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398 | h.apply(scope, args); |
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399 | }, scope); |
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400 | }; |
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401 | }; |
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402 | |
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403 | EXTUTIL.Event = function(obj, name){ |
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404 | this.name = name; |
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405 | this.obj = obj; |
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406 | this.listeners = []; |
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407 | }; |
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408 | |
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409 | EXTUTIL.Event.prototype = { |
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410 | addListener : function(fn, scope, options){ |
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411 | var me = this, |
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412 | l; |
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413 | scope = scope || me.obj; |
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414 | if(!me.isListening(fn, scope)){ |
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415 | l = me.createListener(fn, scope, options); |
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416 | if(me.firing){ // if we are currently firing this event, don't disturb the listener loop |
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417 | me.listeners = me.listeners.slice(0); |
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418 | } |
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419 | me.listeners.push(l); |
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420 | } |
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421 | }, |
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422 | |
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423 | createListener: function(fn, scope, o){ |
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424 | o = o || {}; |
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425 | scope = scope || this.obj; |
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426 | var l = { |
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427 | fn: fn, |
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428 | scope: scope, |
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429 | options: o |
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430 | }, h = fn; |
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431 | if(o.target){ |
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432 | h = createTargeted(h, o, scope); |
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433 | } |
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434 | if(o.delay){ |
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435 | h = createDelayed(h, o, l, scope); |
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436 | } |
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437 | if(o.single){ |
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438 | h = createSingle(h, this, fn, scope); |
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439 | } |
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440 | if(o.buffer){ |
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441 | h = createBuffered(h, o, l, scope); |
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442 | } |
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443 | l.fireFn = h; |
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444 | return l; |
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445 | }, |
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446 | |
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447 | findListener : function(fn, scope){ |
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448 | var list = this.listeners, |
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449 | i = list.length, |
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450 | l; |
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451 | |
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452 | scope = scope || this.obj; |
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453 | while(i--){ |
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454 | l = list[i]; |
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455 | if(l){ |
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456 | if(l.fn == fn && l.scope == scope){ |
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457 | return i; |
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458 | } |
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459 | } |
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460 | } |
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461 | return -1; |
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462 | }, |
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463 | |
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464 | isListening : function(fn, scope){ |
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465 | return this.findListener(fn, scope) != -1; |
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466 | }, |
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467 | |
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468 | removeListener : function(fn, scope){ |
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469 | var index, |
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470 | l, |
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471 | k, |
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472 | me = this, |
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473 | ret = FALSE; |
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474 | if((index = me.findListener(fn, scope)) != -1){ |
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475 | if (me.firing) { |
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476 | me.listeners = me.listeners.slice(0); |
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477 | } |
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478 | l = me.listeners[index]; |
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479 | if(l.task) { |
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480 | l.task.cancel(); |
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481 | delete l.task; |
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482 | } |
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483 | k = l.tasks && l.tasks.length; |
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484 | if(k) { |
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485 | while(k--) { |
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486 | l.tasks[k].cancel(); |
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487 | } |
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488 | delete l.tasks; |
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489 | } |
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490 | me.listeners.splice(index, 1); |
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491 | ret = TRUE; |
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492 | } |
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493 | return ret; |
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494 | }, |
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495 | |
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496 | // Iterate to stop any buffered/delayed events |
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497 | clearListeners : function(){ |
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498 | var me = this, |
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499 | l = me.listeners, |
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500 | i = l.length; |
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501 | while(i--) { |
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502 | me.removeListener(l[i].fn, l[i].scope); |
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503 | } |
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504 | }, |
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505 | |
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506 | fire : function(){ |
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507 | var me = this, |
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508 | listeners = me.listeners, |
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509 | len = listeners.length, |
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510 | i = 0, |
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511 | l; |
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512 | |
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513 | if(len > 0){ |
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514 | me.firing = TRUE; |
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515 | var args = Array.prototype.slice.call(arguments, 0); |
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516 | for (; i < len; i++) { |
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517 | l = listeners[i]; |
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518 | if(l && l.fireFn.apply(l.scope || me.obj || window, args) === FALSE) { |
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519 | return (me.firing = FALSE); |
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520 | } |
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521 | } |
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522 | } |
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523 | me.firing = FALSE; |
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524 | return TRUE; |
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525 | } |
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526 | |
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527 | }; |
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528 | })(); |
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