Registry.js
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/**
* 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.
*/
Ext.define('Ext.dd.Registry', {
singleton: true,
constructor: function() {
this.elements = {};
this.handles = {};
this.autoIdSeed = 0;
},
getId: function(el, autogen){
if(typeof el == "string"){
return el;
}
var id = el.id;
if(!id && autogen !== false){
id = "extdd-" + (++this.autoIdSeed);
el.id = id;
}
return id;
},
/**
* Registers a drag drop element.
*
* @param {String/HTMLElement} element The id or DOM node to register
* @param {Object} data 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):
* @param {HTMLElement[]} data.handles Array of DOM nodes that trigger dragging for the element being registered.
* @param {Boolean} data.isHandle True if the element passed in triggers dragging itself, else false.
*/
register : function(el, data){
data = data || {};
if (typeof el == "string") {
el = document.getElementById(el);
}
data.ddel = el;
this.elements[this.getId(el)] = data;
if (data.isHandle !== false) {
this.handles[data.ddel.id] = data;
}
if (data.handles) {
var hs = data.handles,
i, len;
for (i = 0, len = hs.length; i < len; i++) {
this.handles[this.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 = this.getId(el, false),
data = this.elements[id],
hs, i, len;
if(data){
delete this.elements[id];
if(data.handles){
hs = data.handles;
for (i = 0, len = hs.length; i < len; i++) {
delete this.handles[this.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 this.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 = e.getTarget();
return t ? this.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 this.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 = e.getTarget();
return t ? this.elements[t.id] || this.handles[t.id] : null;
}
});