Просмотр файла sys/javascript/sources/plugins/event.js

Event = (function() {

    var guid = 0;
    
    function fixEvent(event) {
        event = event || window.event;
  
        if ( event.isFixed ) {
            return event;
        }
        event.isFixed = true;
  
        event.preventDefault = event.preventDefault || function(){
            this.returnValue = false;
        }
        event.stopPropagation = event.stopPropagaton || function(){
            this.cancelBubble = true;
        }
    
        if (!event.target) {
            event.target = event.srcElement;
        }
  
        if (!event.relatedTarget && event.fromElement) {
            event.relatedTarget = event.fromElement == event.target ? event.toElement : event.fromElement;
        }
  
        if ( event.pageX == null && event.clientX != null ) {
            var html = document.documentElement, body = document.body;
            event.pageX = event.clientX + (html && html.scrollLeft || body && body.scrollLeft || 0) - (html.clientLeft || 0);
            event.pageY = event.clientY + (html && html.scrollTop || body && body.scrollTop || 0) - (html.clientTop || 0);
        }
  
        if ( !event.which && event.button ) {
            event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));
        }
	
        return event;
    }  
  
    /* Вызывается в контексте элемента всегда this = element */
    function commonHandle(event) {
        event = fixEvent(event);
    
        var handlers = this.events[event.type];

        for ( var g in handlers ) {
            var handler = handlers[g];
            var ret = handler.call(this, event);
            if ( ret === false ) {
                event.preventDefault();
                event.stopPropagation();
            }
        }
    }
  
    return {
        add: function(elem, types, handler) {
            if (elem.setInterval && ( elem != window && !elem.frameElement ) ) {
                elem = window;
            }
      
            if (!handler.guid) {
                handler.guid = ++guid;
            }
      
            if (!elem.events) {
                elem.events = {};
                elem.handle = function(event) {
                    if (typeof Event !== "undefined") {
                        return commonHandle.call(elem, event);
                    }
                }
            }
	  
            types = DCMS.isArray(types)?types:[types];
            for (var i=0; i<types.length; i++){
                var type = types[i];
                if (!elem.events[type]) {
                    elem.events[type] = {};        
      
                    if (elem.addEventListener)
                        elem.addEventListener(type, elem.handle, false);
                    else if (elem.attachEvent)
                        elem.attachEvent("on" + type, elem.handle);
                }
      
                elem.events[type][handler.guid] = handler;
            
            }
        },
    
        remove: function(elem, type, handler) {
            var handlers = elem.events && elem.events[type];
      
            if (!handlers) return;
      
            delete handlers[handler.guid];
      
            for(var any in handlers) return ;
            if (elem.removeEventListener)
                elem.removeEventListener(type, elem.handle, false);
            else if (elem.detachEvent)
                elem.detachEvent("on" + type, elem.handle);
		
            delete elem.events[type];
	
	  
            for (var any in elem.events)
                return;
            try {
                delete elem.handle;
                delete elem.events; 
            } catch(e) { // IE
                elem.removeAttribute("handle");
                elem.removeAttribute("events");
            }
        } 
    }
}());