MixedCollection.js
/**
* @class Ext.util.MixedCollection
* @extends Ext.util.Observable
* A Collection class that maintains both numeric indexes and keys and exposes events.
* @constructor
* @param {Boolean} allowFunctions True if the addAll function should add function references to the
* collection (defaults to false)
* @param {Function} keyFn A function that can accept an item of the type(s) stored in this MixedCollection
* and return the key value for that item. This is used when available to look up the key on items that
* were passed without an explicit key parameter to a MixedCollection method. Passing this parameter is
* equivalent to providing an implementation for the {@link #getKey} method.
*/
Ext.util.MixedCollection = function(allowFunctions, keyFn){
this.items = [];
this.map = {};
this.keys = [];
this.length = 0;
this.addEvents({
/**
* @event clear
* Fires when the collection is cleared.
*/
"clear" : true,
/**
* @event add
* Fires when an item is added to the collection.
* @param {Number} index The index at which the item was added.
* @param {Object} o The item added.
* @param {String} key The key associated with the added item.
*/
"add" : true,
/**
* @event replace
* Fires when an item is replaced in the collection.
* @param {String} key he key associated with the new added.
* @param {Object} old The item being replaced.
* @param {Object} new The new item.
*/
"replace" : true,
/**
* @event remove
* Fires when an item is removed from the collection.
* @param {Object} o The item being removed.
* @param {String} key （可选） The key associated with the removed item.
*/
"remove" : true,
"sort" : true
});
this.allowFunctions = allowFunctions === true;
if(keyFn){
this.getKey = keyFn;
}
Ext.util.MixedCollection.superclass.constructor.call(this);
};
Ext.extend(Ext.util.MixedCollection, Ext.util.Observable, {
allowFunctions : false,
/**
* Adds an item to the collection.
* @param {String} key The key to associate with the item
* @param {Object} o The item to add.
* @return {Object} The item added.
*/
add : function(key, o){
if(arguments.length == 1){
o = arguments[0];
key = this.getKey(o);
}
if(typeof key == "undefined" || key === null){
this.length++;
this.items.push(o);
this.keys.push(null);
}else{
var old = this.map[key];
if(old){
return this.replace(key, o);
}
this.length++;
this.items.push(o);
this.map[key] = o;
this.keys.push(key);
}
this.fireEvent("add", this.length-1, o, key);
return o;
},
/**
* MixedCollection has a generic way to fetch keys if you implement getKey.
<pre><code>
// normal way
var mc = new Ext.util.MixedCollection();
mc.add(someEl.dom.id, someEl);
mc.add(otherEl.dom.id, otherEl);
//and so on
// using getKey
var mc = new Ext.util.MixedCollection();
mc.getKey = function(el){
return el.dom.id;
}
mc.add(someEl);
mc.add(otherEl);
// etc
</code>
* @param o {Object} The item for which to find the key.
* @return {Object} The key for the passed item.
*/
getKey : function(o){
return o.id;
},
/**
* Replaces an item in the collection.
* @param {String} key The key associated with the item to replace, or the item to replace.
* @param o {Object} o （可选） If the first parameter passed was a key, the item to associate with that key.
* @return {Object} The new item.
*/
replace : function(key, o){
if(arguments.length == 1){
o = arguments[0];
key = this.getKey(o);
}
var old = this.item(key);
if(typeof key == "undefined" || key === null || typeof old == "undefined"){
return this.add(key, o);
}
var index = this.indexOfKey(key);
this.items[index] = o;
this.map[key] = o;
this.fireEvent("replace", key, old, o);
return o;
},
/**
* Adds all elements of an Array or an Object to the collection.
* @param {Object/Array} objs An Object containing properties which will be added to the collection, or
* an Array of values, each of which are added to the collection.
*/
addAll : function(objs){
if(arguments.length > 1 || objs instanceof Array){
var args = arguments.length > 1 ? arguments : objs;
for(var i = 0, len = args.length; i < len; i++){
this.add(args[i]);
}
}else{
for(var key in objs){
if(this.allowFunctions || typeof objs[key] != "function"){
this.add(objs[key], key);
}
}
}
},
/**
* Executes the specified function once for every item in the collection, passing each
* item as the first and only parameter. returning false from the function will stop the iteration.
* @param {Function} fn The function to execute for each item.
* @param {Object} scope （可选） The scope in which to execute the function.
*/
each : function(fn, scope){
var items = [].concat(this.items); // each safe for removal
for(var i = 0, len = items.length; i < len; i++){
if(fn.call(scope || items[i], items[i], i, len) === false){
break;
}
}
},
/**
* Executes the specified function once for every key in the collection, passing each
* key, and its associated item as the first two parameters.
* @param {Function} fn The function to execute for each item.
* @param {Object} scope （可选） The scope in which to execute the function.
*/
eachKey : function(fn, scope){
for(var i = 0, len = this.keys.length; i < len; i++){
fn.call(scope || window, this.keys[i], this.items[i], i, len);
}
},
/**
* Returns the first item in the collection which elicits a true return value from the
* passed selection function.
* @param {Function} fn The selection function to execute for each item.
* @param {Object} scope （可选） The scope in which to execute the function.
* @return {Object} The first item in the collection which returned true from the selection function.
*/
find : function(fn, scope){
for(var i = 0, len = this.items.length; i < len; i++){
if(fn.call(scope || window, this.items[i], this.keys[i])){
return this.items[i];
}
}
return null;
},
/**
* Inserts an item at the specified index in the collection.
* @param {Number} index The index to insert the item at.
* @param {String} key The key to associate with the new item, or the item itself.
* @param {Object} o （可选） If the second parameter was a key, the new item.
* @return {Object} The item inserted.
*/
insert : function(index, key, o){
if(arguments.length == 2){
o = arguments[1];
key = this.getKey(o);
}
if(index >= this.length){
return this.add(key, o);
}
this.length++;
this.items.splice(index, 0, o);
if(typeof key != "undefined" && key != null){
this.map[key] = o;
}
this.keys.splice(index, 0, key);
this.fireEvent("add", index, o, key);
return o;
},
/**
* Removed an item from the collection.
* @param {Object} o The item to remove.
* @return {Object} The item removed.
*/
remove : function(o){
return this.removeAt(this.indexOf(o));
},
/**
* Remove an item from a specified index in the collection.
* @param {Number} index The index within the collection of the item to remove.
*/
removeAt : function(index){
if(index < this.length && index >= 0){
this.length--;
var o = this.items[index];
this.items.splice(index, 1);
var key = this.keys[index];
if(typeof key != "undefined"){
delete this.map[key];
}
this.keys.splice(index, 1);
this.fireEvent("remove", o, key);
}
},
/**
* Removed an item associated with the passed key fom the collection.
* @param {String} key The key of the item to remove.
*/
removeKey : function(key){
return this.removeAt(this.indexOfKey(key));
},
/**
* Returns the number of items in the collection.
* @return {Number} the number of items in the collection.
*/
getCount : function(){
return this.length;
},
/**
* Returns index within the collection of the passed Object.
* @param {Object} o The item to find the index of.
* @return {Number} index of the item.
*/
indexOf : function(o){
if(!this.items.indexOf){
for(var i = 0, len = this.items.length; i < len; i++){
if(this.items[i] == o) return i;
}
return -1;
}else{
return this.items.indexOf(o);
}
},
/**
* Returns index within the collection of the passed key.
* @param {String} key The key to find the index of.
* @return {Number} index of the key.
*/
indexOfKey : function(key){
if(!this.keys.indexOf){
for(var i = 0, len = this.keys.length; i < len; i++){
if(this.keys[i] == key) return i;
}
return -1;
}else{
return this.keys.indexOf(key);
}
},
/**
* Returns the item associated with the passed key OR index. Key has priority over index.
* @param {String/Number} key The key or index of the item.
* @return {Object} The item associated with the passed key.
*/
item : function(key){
var item = typeof this.map[key] != "undefined" ? this.map[key] : this.items[key];
return typeof item != 'function' || this.allowFunctions ? item : null; // for prototype!
},
/**
* Returns the item at the specified index.
* @param {Number} index The index of the item.
* @return {Object}
*/
itemAt : function(index){
return this.items[index];
},
/**
* Returns the item associated with the passed key.
* @param {String/Number} key The key of the item.
* @return {Object} The item associated with the passed key.
*/
key : function(key){
return this.map[key];
},
/**
* Returns true if the collection contains the passed Object as an item.
* @param {Object} o The Object to look for in the collection.
* @return {Boolean} True if the collection contains the Object as an item.
*/
contains : function(o){
return this.indexOf(o) != -1;
},
/**
* Returns true if the collection contains the passed Object as a key.
* @param {String} key The key to look for in the collection.
* @return {Boolean} True if the collection contains the Object as a key.
*/
containsKey : function(key){
return typeof this.map[key] != "undefined";
},
/**
* Removes all items from the collection.
*/
clear : function(){
this.length = 0;
this.items = [];
this.keys = [];
this.map = {};
this.fireEvent("clear");
},
/**
* Returns the first item in the collection.
* @return {Object} the first item in the collection..
*/
first : function(){
return this.items[0];
},
/**
* Returns the last item in the collection.
* @return {Object} the last item in the collection..
*/
last : function(){
return this.items[this.length-1];
},
_sort : function(property, dir, fn){
var dsc = String(dir).toUpperCase() == "DESC" ? -1 : 1;
fn = fn || function(a, b){
return a-b;
};
var c = [], k = this.keys, items = this.items;
for(var i = 0, len = items.length; i < len; i++){
c[c.length] = {key: k[i], value: items[i], index: i};
}
c.sort(function(a, b){
var v = fn(a[property], b[property]) * dsc;
if(v == 0){
v = (a.index < b.index ? -1 : 1);
}
return v;
});
for(var i = 0, len = c.length; i < len; i++){
items[i] = c[i].value;
k[i] = c[i].key;
}
this.fireEvent("sort", this);
},
/**
* Sorts this collection with the passed comparison function
* @param {String} direction （可选） "ASC" or "DESC"
* @param {Function} fn （可选） comparison function
*/
sort : function(dir, fn){
this._sort("value", dir, fn);
},
/**
* Sorts this collection by keys
* @param {String} direction （可选） "ASC" or "DESC"
* @param {Function} fn （可选） a comparison function (defaults to case insensitive string)
*/
keySort : function(dir, fn){
this._sort("key", dir, fn || function(a, b){
return String(a).toUpperCase()-String(b).toUpperCase();
});
},
/**
* Returns a range of items in this collection
* @param {Number} startIndex （可选） defaults to 0
* @param {Number} endIndex （可选） default to the last item
* @return {Array} An array of items
*/
getRange : function(start, end){
var items = this.items;
if(items.length < 1){
return [];
}
start = start || 0;
end = Math.min(typeof end == "undefined" ? this.length-1 : end, this.length-1);
var r = [];
if(start <= end){
for(var i = start; i <= end; i++) {
r[r.length] = items[i];
}
}else{
for(var i = start; i >= end; i--) {
r[r.length] = items[i];
}
}
return r;
},
/**
* Filter the <i>objects</i> in this collection by a specific property.
* Returns a new collection that has been filtered.
* @param {String} property A property on your objects
* @param {String/RegExp} value Either string that the property values
* should start with or a RegExp to test against the property
* @return {MixedCollection} The new filtered collection
*/
filter : function(property, value){
if(!value.exec){ // not a regex
value = String(value);
if(value.length == 0){
return this.clone();
}
value = new RegExp("^" + Ext.escapeRe(value), "i");
}
return this.filterBy(function(o){
return o && value.test(o[property]);
});
},
/**
* Filter by a function. * Returns a new collection that has been filtered.
* The passed function will be called with each
* object in the collection. If the function returns true, the value is included
* otherwise it is filtered.
* @param {Function} fn The function to be called, it will receive the args o (the object), k (the key)
* @param {Object} scope （可选） The scope of the function (defaults to this)
* @return {MixedCollection} The new filtered collection
*/
filterBy : function(fn, scope){
var r = new Ext.util.MixedCollection();
r.getKey = this.getKey;
var k = this.keys, it = this.items;
for(var i = 0, len = it.length; i < len; i++){
if(fn.call(scope||this, it[i], k[i])){
r.add(k[i], it[i]);
}
}
return r;
},
/**
* Creates a duplicate of this collection
* @return {MixedCollection}
*/
clone : function(){
var r = new Ext.util.MixedCollection();
var k = this.keys, it = this.items;
for(var i = 0, len = it.length; i < len; i++){
r.add(k[i], it[i]);
}
r.getKey = this.getKey;
return r;
}
});
/**
* Returns the item associated with the passed key or index.
* @method
* @param {String/Number} key The key or index of the item.
* @return {Object} The item associated with the passed key.
*/
Ext.util.MixedCollection.prototype.get = Ext.util.MixedCollection.prototype.item;
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