www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/core/EventManager.js
/* * Ext JS Library 2.0.2 * Copyright(c) 2006-2008, Ext JS, LLC. * licensing@extjs.com * * http://extjs.com/license */ /** * @class Ext.EventManager * Registers event handlers that want to receive a normalized EventObject instead of the standard browser event and provides * several useful events directly. * See {@link Ext.EventObject} for more details on normalized event objects. * @singleton */ Ext.EventManager = function(){ var docReadyEvent, docReadyProcId, docReadyState = false; var resizeEvent, resizeTask, textEvent, textSize; var E = Ext.lib.Event; var D = Ext.lib.Dom; var fireDocReady = function(){ if(!docReadyState){ docReadyState = true; Ext.isReady = true; if(docReadyProcId){ clearInterval(docReadyProcId); } if(Ext.isGecko || Ext.isOpera) { document.removeEventListener("DOMContentLoaded", fireDocReady, false); } if(Ext.isIE){ var defer = document.getElementById("ie-deferred-loader"); if(defer){ defer.onreadystatechange = null; defer.parentNode.removeChild(defer); } } if(docReadyEvent){ docReadyEvent.fire(); docReadyEvent.clearListeners(); } } }; var initDocReady = function(){ docReadyEvent = new Ext.util.Event(); if(Ext.isGecko || Ext.isOpera) { document.addEventListener("DOMContentLoaded", fireDocReady, false); }else if(Ext.isIE){ document.write("<s"+'cript id="ie-deferred-loader" defer="defer" src="/'+'/:"></s'+"cript>"); var defer = document.getElementById("ie-deferred-loader"); defer.onreadystatechange = function(){ if(this.readyState == "complete"){ fireDocReady(); } }; }else if(Ext.isSafari){ docReadyProcId = setInterval(function(){ var rs = document.readyState; if(rs == "complete") { fireDocReady(); } }, 10); } // no matter what, make sure it fires on load E.on(window, "load", fireDocReady); }; var createBuffered = function(h, o){ var task = new Ext.util.DelayedTask(h); return function(e){ // create new event object impl so new events don't wipe out properties e = new Ext.EventObjectImpl(e); task.delay(o.buffer, h, null, [e]); }; }; var createSingle = function(h, el, ename, fn){ return function(e){ Ext.EventManager.removeListener(el, ename, fn); h(e); }; }; var createDelayed = function(h, o){ return function(e){ // create new event object impl so new events don't wipe out properties e = new Ext.EventObjectImpl(e); setTimeout(function(){ h(e); }, o.delay || 10); }; }; var listen = function(element, ename, opt, fn, scope){ var o = (!opt || typeof opt == "boolean") ? {} : opt; fn = fn || o.fn; scope = scope || o.scope; var el = Ext.getDom(element); if(!el){ throw "Error listening for \"" + ename + '\". Element "' + element + '" doesn\'t exist.'; } var h = function(e){ e = Ext.EventObject.setEvent(e); var t; if(o.delegate){ t = e.getTarget(o.delegate, el); if(!t){ return; } }else{ t = e.target; } if(o.stopEvent === true){ e.stopEvent(); } if(o.preventDefault === true){ e.preventDefault(); } if(o.stopPropagation === true){ e.stopPropagation(); } if(o.normalized === false){ e = e.browserEvent; } fn.call(scope || el, e, t, o); }; if(o.delay){ h = createDelayed(h, o); } if(o.single){ h = createSingle(h, el, ename, fn); } if(o.buffer){ h = createBuffered(h, o); } fn._handlers = fn._handlers || []; fn._handlers.push([Ext.id(el), ename, h]); E.on(el, ename, h); if(ename == "mousewheel" && el.addEventListener){ // workaround for jQuery el.addEventListener("DOMMouseScroll", h, false); E.on(window, 'unload', function(){ el.removeEventListener("DOMMouseScroll", h, false); }); } if(ename == "mousedown" && el == document){ // fix stopped mousedowns on the document Ext.EventManager.stoppedMouseDownEvent.addListener(h); } return h; }; var stopListening = function(el, ename, fn){ var id = Ext.id(el), hds = fn._handlers, hd = fn; if(hds){ for(var i = 0, len = hds.length; i < len; i++){ var h = hds[i]; if(h[0] == id && h[1] == ename){ hd = h[2]; hds.splice(i, 1); break; } } } E.un(el, ename, hd); el = Ext.getDom(el); if(ename == "mousewheel" && el.addEventListener){ el.removeEventListener("DOMMouseScroll", hd, false); } if(ename == "mousedown" && el == document){ // fix stopped mousedowns on the document Ext.EventManager.stoppedMouseDownEvent.removeListener(hd); } }; var propRe = /^(?:scope|delay|buffer|single|stopEvent|preventDefault|stopPropagation|normalized|args|delegate)$/; var pub = { /** * Appends an event handler to an element. The shorthand version {@link #on} is equivalent. Typically you will * use {@link Ext.Element#addListener} directly on an Element in favor of calling this version. * @param {String/HTMLElement} el The html element or id to assign the event handler to * @param {String} eventName The type of event to listen for * @param {Function} handler The handler function the event invokes * @param {Object} scope (optional) The scope in which to execute the handler * function (the handler function's "this" context) * @param {Object} options (optional) An object containing handler configuration properties. * This may contain any of the following properties:<ul> * <li>scope {Object} : The scope in which to execute the handler function. The handler function's "this" context.</li> * <li>delegate {String} : A simple selector to filter the target or look for a descendant of the target</li> * <li>stopEvent {Boolean} : True to stop the event. That is stop propagation, and prevent the default action.</li> * <li>preventDefault {Boolean} : True to prevent the default action</li> * <li>stopPropagation {Boolean} : True to prevent event propagation</li> * <li>normalized {Boolean} : False to pass a browser event to the handler function instead of an Ext.EventObject</li> * <li>delay {Number} : The number of milliseconds to delay the invocation of the handler after te event fires.</li> * <li>single {Boolean} : True to add a handler to handle just the next firing of the event, and then remove itself.</li> * <li>buffer {Number} : Causes the handler to be scheduled to run in an {@link Ext.util.DelayedTask} delayed * by the specified number of milliseconds. If the event fires again within that time, the original * handler is <em>not</em> invoked, but the new handler is scheduled in its place.</li> * </ul><br> * <p>See {@link Ext.Element#addListener} for examples of how to use these options.</p> */ addListener : function(element, eventName, fn, scope, options){ if(typeof eventName == "object"){ var o = eventName; for(var e in o){ if(propRe.test(e)){ continue; } if(typeof o[e] == "function"){ // shared options listen(element, e, o, o[e], o.scope); }else{ // individual options listen(element, e, o[e]); } } return; } return listen(element, eventName, options, fn, scope); }, /** * Removes an event handler from an element. The shorthand version {@link #un} is equivalent. Typically * you will use {@link Ext.Element#removeListener} directly on an Element in favor of calling this version. * @param {String/HTMLElement} el The id or html element from which to remove the event * @param {String} eventName The type of event * @param {Function} fn The handler function to remove * @return {Boolean} True if a listener was actually removed, else false */ removeListener : function(element, eventName, fn){ return stopListening(element, eventName, fn); }, /** * Fires when the document is ready (before onload and before images are loaded). Can be * accessed shorthanded as Ext.onReady(). * @param {Function} fn The method the event invokes * @param {Object} scope (optional) An object that becomes the scope of the handler * @param {boolean} options (optional) An object containing standard {@link #addListener} options */ onDocumentReady : function(fn, scope, options){ if(docReadyState){ // if it already fired docReadyEvent.addListener(fn, scope, options); docReadyEvent.fire(); docReadyEvent.clearListeners(); return; } if(!docReadyEvent){ initDocReady(); } docReadyEvent.addListener(fn, scope, options); }, /** * Fires when the window is resized and provides resize event buffering (50 milliseconds), passes new viewport width and height to handlers. * @param {Function} fn The method the event invokes * @param {Object} scope An object that becomes the scope of the handler * @param {boolean} options */ onWindowResize : function(fn, scope, options){ if(!resizeEvent){ resizeEvent = new Ext.util.Event(); resizeTask = new Ext.util.DelayedTask(function(){ resizeEvent.fire(D.getViewWidth(), D.getViewHeight()); }); E.on(window, "resize", this.fireWindowResize, this); } resizeEvent.addListener(fn, scope, options); }, // exposed only to allow manual firing fireWindowResize : function(){ if(resizeEvent){ if((Ext.isIE||Ext.isAir) && resizeTask){ resizeTask.delay(50); }else{ resizeEvent.fire(D.getViewWidth(), D.getViewHeight()); } } }, /** * Fires when the user changes the active text size. Handler gets called with 2 params, the old size and the new size. * @param {Function} fn The method the event invokes * @param {Object} scope An object that becomes the scope of the handler * @param {boolean} options */ onTextResize : function(fn, scope, options){ if(!textEvent){ textEvent = new Ext.util.Event(); var textEl = new Ext.Element(document.createElement('div')); textEl.dom.className = 'x-text-resize'; textEl.dom.innerHTML = 'X'; textEl.appendTo(document.body); textSize = textEl.dom.offsetHeight; setInterval(function(){ if(textEl.dom.offsetHeight != textSize){ textEvent.fire(textSize, textSize = textEl.dom.offsetHeight); } }, this.textResizeInterval); } textEvent.addListener(fn, scope, options); }, /** * Removes the passed window resize listener. * @param {Function} fn The method the event invokes * @param {Object} scope The scope of handler */ removeResizeListener : function(fn, scope){ if(resizeEvent){ resizeEvent.removeListener(fn, scope); } }, // private fireResize : function(){ if(resizeEvent){ resizeEvent.fire(D.getViewWidth(), D.getViewHeight()); } }, /** * Url used for onDocumentReady with using SSL (defaults to Ext.SSL_SECURE_URL) */ ieDeferSrc : false, /** * The frequency, in milliseconds, to check for text resize events (defaults to 50) */ textResizeInterval : 50 }; /** * Appends an event handler to an element. Shorthand for {@link #addListener}. * @param {String/HTMLElement} el The html element or id to assign the event handler to * @param {String} eventName The type of event to listen for * @param {Function} handler The handler function the event invokes * @param {Object} scope (optional) The scope in which to execute the handler * function (the handler function's "this" context) * @param {Object} options (optional) An object containing standard {@link #addListener} options * @member Ext.EventManager * @method on */ pub.on = pub.addListener; /** * Removes an event handler from an element. Shorthand for {@link #removeListener}. * @param {String/HTMLElement} el The id or html element from which to remove the event * @param {String} eventName The type of event * @param {Function} fn The handler function to remove * @return {Boolean} True if a listener was actually removed, else false * @member Ext.EventManager * @method un */ pub.un = pub.removeListener; pub.stoppedMouseDownEvent = new Ext.util.Event(); return pub; }(); /** * Fires when the document is ready (before onload and before images are loaded). Shorthand of {@link Ext.EventManager#onDocumentReady}. * @param {Function} fn The method the event invokes * @param {Object} scope An object that becomes the scope of the handler * @param {boolean} override If true, the obj passed in becomes * the execution scope of the listener * @member Ext * @method onReady */ Ext.onReady = Ext.EventManager.onDocumentReady; Ext.onReady(function(){ var bd = Ext.getBody(); if(!bd){ return; } var cls = [ Ext.isIE ? "ext-ie " + (Ext.isIE6 ? 'ext-ie6' : 'ext-ie7') : Ext.isGecko ? "ext-gecko" : Ext.isOpera ? "ext-opera" : Ext.isSafari ? "ext-safari" : ""]; if(Ext.isMac){ cls.push("ext-mac"); } if(Ext.isLinux){ cls.push("ext-linux"); } if(Ext.isBorderBox){ cls.push('ext-border-box'); } if(Ext.isStrict){ // add to the parent to allow for selectors like ".ext-strict .ext-ie" var p = bd.dom.parentNode; if(p){ p.className += ' ext-strict'; } } bd.addClass(cls.join(' ')); }); /** * @class Ext.EventObject * EventObject exposes the Yahoo! UI Event functionality directly on the object * passed to your event handler. It exists mostly for convenience. It also fixes the annoying null checks automatically to cleanup your code * Example: * <pre><code> function handleClick(e){ // e is not a standard event object, it is a Ext.EventObject e.preventDefault(); var target = e.getTarget(); ... } var myDiv = Ext.get("myDiv"); myDiv.on("click", handleClick); //or Ext.EventManager.on("myDiv", 'click', handleClick); Ext.EventManager.addListener("myDiv", 'click', handleClick); </code></pre> * @singleton */ Ext.EventObject = function(){ var E = Ext.lib.Event; // safari keypress events for special keys return bad keycodes var safariKeys = { 63234 : 37, // left 63235 : 39, // right 63232 : 38, // up 63233 : 40, // down 63276 : 33, // page up 63277 : 34, // page down 63272 : 46, // delete 63273 : 36, // home 63275 : 35 // end }; // normalize button clicks var btnMap = Ext.isIE ? {1:0,4:1,2:2} : (Ext.isSafari ? {1:0,2:1,3:2} : {0:0,1:1,2:2}); Ext.EventObjectImpl = function(e){ if(e){ this.setEvent(e.browserEvent || e); } }; Ext.EventObjectImpl.prototype = { /** The normal browser event */ browserEvent : null, /** The button pressed in a mouse event */ button : -1, /** True if the shift key was down during the event */ shiftKey : false, /** True if the control key was down during the event */ ctrlKey : false, /** True if the alt key was down during the event */ altKey : false, /** Key constant @type Number */ BACKSPACE : 8, /** Key constant @type Number */ TAB : 9, /** Key constant @type Number */ RETURN : 13, /** Key constant @type Number */ ENTER : 13, /** Key constant @type Number */ SHIFT : 16, /** Key constant @type Number */ CONTROL : 17, /** Key constant @type Number */ ESC : 27, /** Key constant @type Number */ SPACE : 32, /** Key constant @type Number */ PAGEUP : 33, /** Key constant @type Number */ PAGEDOWN : 34, /** Key constant @type Number */ END : 35, /** Key constant @type Number */ HOME : 36, /** Key constant @type Number */ LEFT : 37, /** Key constant @type Number */ UP : 38, /** Key constant @type Number */ RIGHT : 39, /** Key constant @type Number */ DOWN : 40, /** Key constant @type Number */ DELETE : 46, /** Key constant @type Number */ F5 : 116, /** @private */ setEvent : function(e){ if(e == this || (e && e.browserEvent)){ // already wrapped return e; } this.browserEvent = e; if(e){ // normalize buttons this.button = e.button ? btnMap[e.button] : (e.which ? e.which-1 : -1); if(e.type == 'click' && this.button == -1){ this.button = 0; } this.type = e.type; this.shiftKey = e.shiftKey; // mac metaKey behaves like ctrlKey this.ctrlKey = e.ctrlKey || e.metaKey; this.altKey = e.altKey; // in getKey these will be normalized for the mac this.keyCode = e.keyCode; this.charCode = e.charCode; // cache the target for the delayed and or buffered events this.target = E.getTarget(e); // same for XY this.xy = E.getXY(e); }else{ this.button = -1; this.shiftKey = false; this.ctrlKey = false; this.altKey = false; this.keyCode = 0; this.charCode =0; this.target = null; this.xy = [0, 0]; } return this; }, /** * Stop the event (preventDefault and stopPropagation) */ stopEvent : function(){ if(this.browserEvent){ if(this.browserEvent.type == 'mousedown'){ Ext.EventManager.stoppedMouseDownEvent.fire(this); } E.stopEvent(this.browserEvent); } }, /** * Prevents the browsers default handling of the event. */ preventDefault : function(){ if(this.browserEvent){ E.preventDefault(this.browserEvent); } }, /** @private */ isNavKeyPress : function(){ var k = this.keyCode; k = Ext.isSafari ? (safariKeys[k] || k) : k; return (k >= 33 && k <= 40) || k == this.RETURN || k == this.TAB || k == this.ESC; }, isSpecialKey : function(){ var k = this.keyCode; return (this.type == 'keypress' && this.ctrlKey) || k == 9 || k == 13 || k == 40 || k == 27 || (k == 16) || (k == 17) || (k >= 18 && k <= 20) || (k >= 33 && k <= 35) || (k >= 36 && k <= 39) || (k >= 44 && k <= 45); }, /** * Cancels bubbling of the event. */ stopPropagation : function(){ if(this.browserEvent){ if(this.browserEvent.type == 'mousedown'){ Ext.EventManager.stoppedMouseDownEvent.fire(this); } E.stopPropagation(this.browserEvent); } }, /** * Gets the key code for the event. * @return {Number} */ getCharCode : function(){ return this.charCode || this.keyCode; }, /** * Returns a normalized keyCode for the event. * @return {Number} The key code */ getKey : function(){ var k = this.keyCode || this.charCode; return Ext.isSafari ? (safariKeys[k] || k) : k; }, /** * Gets the x coordinate of the event. * @return {Number} */ getPageX : function(){ return this.xy[0]; }, /** * Gets the y coordinate of the event. * @return {Number} */ getPageY : function(){ return this.xy[1]; }, /** * Gets the time of the event. * @return {Number} */ getTime : function(){ if(this.browserEvent){ return E.getTime(this.browserEvent); } return null; }, /** * Gets the page coordinates of the event. * @return {Array} The xy values like [x, y] */ getXY : function(){ return this.xy; }, /** * Gets the target for the event. * @param {String} selector (optional) A simple selector to filter the target or look for an ancestor of the target * @param {Number/Mixed} maxDepth (optional) The max depth to search as a number or element (defaults to 10 || document.body) * @param {Boolean} returnEl (optional) True to return a Ext.Element object instead of DOM node * @return {HTMLelement} */ getTarget : function(selector, maxDepth, returnEl){ var t = Ext.get(this.target); return selector ? t.findParent(selector, maxDepth, returnEl) : (returnEl ? t : this.target); }, /** * Gets the related target. * @return {HTMLElement} */ getRelatedTarget : function(){ if(this.browserEvent){ return E.getRelatedTarget(this.browserEvent); } return null; }, /** * Normalizes mouse wheel delta across browsers * @return {Number} The delta */ getWheelDelta : function(){ var e = this.browserEvent; var delta = 0; if(e.wheelDelta){ /* IE/Opera. */ delta = e.wheelDelta/120; }else if(e.detail){ /* Mozilla case. */ delta = -e.detail/3; } return delta; }, /** * Returns true if the control, meta, shift or alt key was pressed during this event. * @return {Boolean} */ hasModifier : function(){ return ((this.ctrlKey || this.altKey) || this.shiftKey) ? true : false; }, /** * Returns true if the target of this event equals el or is a child of el * @param {Mixed} el * @param {Boolean} related (optional) true to test if the related target is within el instead of the target * @return {Boolean} */ within : function(el, related){ var t = this[related ? "getRelatedTarget" : "getTarget"](); return t && Ext.fly(el).contains(t); }, getPoint : function(){ return new Ext.lib.Point(this.xy[0], this.xy[1]); } }; return new Ext.EventObjectImpl(); }();