X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/ee06f37b0f6f6d94cd05a6ffae556660f7c4a2bc..c930e9176a5a85509c5b0230e2bff5c22a591432:/src/dd/Registry.js

diff --git a/src/dd/Registry.js b/src/dd/Registry.js
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+/*!
+ * Ext JS Library 3.0.0
+ * Copyright(c) 2006-2009 Ext JS, LLC
+ * licensing@extjs.com
+ * http://www.extjs.com/license
+ */
+/**
+ * @class Ext.dd.Registry
+ * Provides easy access to all drag drop components that are registered on a page.  Items can be retrieved either
+ * directly by DOM node id, or by passing in the drag drop event that occurred and looking up the event target.
+ * @singleton
+ */
+Ext.dd.Registry = function(){
+    var elements = {}; 
+    var handles = {}; 
+    var autoIdSeed = 0;
+
+    var getId = function(el, autogen){
+        if(typeof el == "string"){
+            return el;
+        }
+        var id = el.id;
+        if(!id && autogen !== false){
+            id = "extdd-" + (++autoIdSeed);
+            el.id = id;
+        }
+        return id;
+    };
+    
+    return {
+    /**
+     * Resgister a drag drop element
+     * @param {String/HTMLElement) element The id or DOM node to register
+     * @param {Object} data (optional) An custom data object that will be passed between the elements that are involved
+     * in drag drop operations.  You can populate this object with any arbitrary properties that your own code
+     * knows how to interpret, plus there are some specific properties known to the Registry that should be
+     * populated in the data object (if applicable):
+     * <pre>
+Value      Description<br />
+---------  ------------------------------------------<br />
+handles    Array of DOM nodes that trigger dragging<br />
+           for the element being registered<br />
+isHandle   True if the element passed in triggers<br />
+           dragging itself, else false
+</pre>
+     */
+        register : function(el, data){
+            data = data || {};
+            if(typeof el == "string"){
+                el = document.getElementById(el);
+            }
+            data.ddel = el;
+            elements[getId(el)] = data;
+            if(data.isHandle !== false){
+                handles[data.ddel.id] = data;
+            }
+            if(data.handles){
+                var hs = data.handles;
+                for(var i = 0, len = hs.length; i < len; i++){
+                	handles[getId(hs[i])] = data;
+                }
+            }
+        },
+
+    /**
+     * Unregister a drag drop element
+     * @param {String/HTMLElement) element The id or DOM node to unregister
+     */
+        unregister : function(el){
+            var id = getId(el, false);
+            var data = elements[id];
+            if(data){
+                delete elements[id];
+                if(data.handles){
+                    var hs = data.handles;
+                    for(var i = 0, len = hs.length; i < len; i++){
+                    	delete handles[getId(hs[i], false)];
+                    }
+                }
+            }
+        },
+
+    /**
+     * Returns the handle registered for a DOM Node by id
+     * @param {String/HTMLElement} id The DOM node or id to look up
+     * @return {Object} handle The custom handle data
+     */
+        getHandle : function(id){
+            if(typeof id != "string"){ // must be element?
+                id = id.id;
+            }
+            return handles[id];
+        },
+
+    /**
+     * Returns the handle that is registered for the DOM node that is the target of the event
+     * @param {Event} e The event
+     * @return {Object} handle The custom handle data
+     */
+        getHandleFromEvent : function(e){
+            var t = Ext.lib.Event.getTarget(e);
+            return t ? handles[t.id] : null;
+        },
+
+    /**
+     * Returns a custom data object that is registered for a DOM node by id
+     * @param {String/HTMLElement} id The DOM node or id to look up
+     * @return {Object} data The custom data
+     */
+        getTarget : function(id){
+            if(typeof id != "string"){ // must be element?
+                id = id.id;
+            }
+            return elements[id];
+        },
+
+    /**
+     * Returns a custom data object that is registered for the DOM node that is the target of the event
+     * @param {Event} e The event
+     * @return {Object} data The custom data
+     */
+        getTargetFromEvent : function(e){
+            var t = Ext.lib.Event.getTarget(e);
+            return t ? elements[t.id] || handles[t.id] : null;
+        }
+    };
+}();
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