FlexによるArrayCollectionの再構築
プロジェクトの必要に応じて、ArrayCollectionを再構築します.次の機能が含まれます.
1、並べ替え
2,moveFirst moveLast moveNext movePreレコードナビゲーションとindexのオブジェクトの選択
3、削除、更新、挿入、レコードの追加機能
4、フィルタリング
次に例を示します.
ソースコードは次のとおりです.
1、並べ替え
2,moveFirst moveLast moveNext movePreレコードナビゲーションとindexのオブジェクトの選択
3、削除、更新、挿入、レコードの追加機能
4、フィルタリング
次に例を示します.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init();">
<mx:Script>
<![CDATA[
import mx.collections.CursorBookmark;
import com.hexagonstar.util.debug.Debug;
import org.app.utils.common.collections.MyArrayCollection;
import com.adobe.serialization.json.JSON;
var arr:Array=[
{a:1,b:1,c:1},
{a:21,b:21,c:21},
{a:12,b:12,c:12},
{a:10,b:10,c:10},
{a:2,b:2,c:2}
];
[Bindable]
var coll:MyArrayCollection = null;
[Bindable]
var scc:String = null;
private function init():void{
coll =new MyArrayCollection(arr);
//var sortArr:Array=[{name:"a"},{name:"b"}];
//coll.sortCollection(sortArr);
src.text= coll.toString();
//dest.text = JSON.encode(coll.currentItem);
scc = coll.toString();
dest.text = scc;
//keywords
coll.keywords=["a"];
}
private function insert():void{
var s:String = src.text;
var o:Object = JSON.decode(s);
coll.insertItem(o);
scc = coll.toString();
dest.text = scc;
}
private function append():void{
var s:String = src.text;
var o:Object = JSON.decode(s);
coll.appendItem(o);
scc = coll.toString();
dest.text = scc;
}
private function moveFirst():void{
var o:Object = coll.moveFirst();
dest.text = JSON.encode(o);
}
private function moveLast():void{
var o:Object = coll.moveLast();
dest.text = JSON.encode(o);
}
private function moveNext():void{
var o:Object = coll.moveNext();
dest.text = JSON.encode(o);
}
private function movePre():void{
var o:Object = coll.movePrevious();
dest.text = JSON.encode(o);
}
private function doClear():void{
dest.text = "";
}
private function doUpd():void{
var o:Object = JSON.decode(src.text);
coll.updateItem(o);
o = coll.currentItem;
dest.text = JSON.encode(o);
}
private function doDel():void{
var o:Object = JSON.decode(src.text);
var flg:Boolean = coll.remove();
Debug.trace("--remove:"+flg);
scc = coll.toString();
dest.text = scc;
}
]]>
</mx:Script>
<mx:TextArea id="src" x="25" y="40" width="267" height="103"/>
<mx:Button x="25" y="10" label=" " click="doUpd();"/>
<mx:Button x="188" y="10" label=" " click="doDel();"/>
<mx:Button x="244" y="10" label=" "/>
<mx:Button x="76" y="10" label=" " click="insert();"/>
<mx:Button x="132" y="10" label=" " click="append();"/>
<mx:TextArea id="dest" x="300" y="40" width="333" height="103" editable="false" text="{scc}"/>
<mx:Button x="25" y="299" label="|<" toolTip=" " click="moveFirst();"/>
<mx:Button x="125" y="299" label=">>" toolTip=" " click="moveNext();"/>
<mx:Button x="73" y="299" label="<<" toolTip=" " click="movePre();"/>
<mx:Button x="177" y="299" label=">|" toolTip=" " click="moveLast();"/>
<mx:DataGrid x="25" y="151" width="608" height="143" dataProvider="{coll}">
<mx:columns>
<mx:DataGridColumn headerText="ColumnA" dataField="a"/>
<mx:DataGridColumn headerText="ColumnB" dataField="b"/>
<mx:DataGridColumn headerText="ColumnC" dataField="c"/>
</mx:columns>
</mx:DataGrid>
<mx:Button x="585" y="10" label=" " toggle="true" click="doClear();"/>
</mx:Application>
ソースコードは次のとおりです.
/**
* ：
* coll=new ArrayCollection(
* [
* {name: "Martin Foo", age: 25},
* {name: "Joe Bar", age: 15},
* {name: "John Baz", age: 23}
* ]
* );
* coll.addItemAt({name: "James Fez", age: 40}, 0);
*/
package org.app.utils.common.collections
{
import flash.events.Event;
import mx.collections.ArrayCollection;
import mx.collections.CursorBookmark;
import mx.collections.IViewCursor;
import mx.collections.Sort;
import mx.collections.SortField;
import mx.events.FlexEvent;
import mx.logging.ILogger;
import org.app.framework.AppContext;
import org.app.utils.common.MyJSONUtils;
import org.app.utils.log.MyLoggerManager;
public class MyArrayCollection extends ArrayCollection
{
////////////////////////////////////////////////////////////////////////
/* */
public static const RL_NAME:String = "name";// 。[String]
public static const RL_CASEINSENSITIVE:String = "caseInsensitive";//Boolean 。
public static const RL_DESCENDING:String = "descending";//Boolean 。
/* */
//
public static const EVENT_CURSOR_UPDATE:String = "event_cursor_update";
/*Object (number/int/uint)
* ， 。*/
public static const RL_NUMERIC:String = "numeric";
////////////////////////////////////////////////////////////////////////
private var logger:ILogger = MyLoggerManager.getLogger("MyArrayCollection",AppContext.getInstance().appLogTarget);
////////////////////////////////////////////////////////////////////////
/* */
private var _cursor:IViewCursor = null;//
private var _currentItem:Object = null;//
/* JSON ， keys*/
private var _keys:Array = null;// json properties
private var _keywords:Array = null;// properties ，
public function MyArrayCollection(source:Array=null)
{
super(source);
//
this._cursor = this.createCursor();
//
this._cursor.addEventListener(FlexEvent.CURSOR_UPDATE,fireCursorUpdate,false,0,true);
// -- cursor update
this._cursor.seek(CursorBookmark.CURRENT);
// keys keys
this.fetchKeys();
}
////////////////////////////////////////////////////////////////////////
/**
* , ，
* currentItem 。
* @param FlexEvent
* @return
*/
private function fireCursorUpdate(event:FlexEvent):void{
//
this._currentItem = (event.currentTarget as IViewCursor).current;
// moveLast moveFirst 2 , ，
var a:String = " ";
if (this._currentItem) {
a=" ";
this.dispatchEvent(new Event(EVENT_CURSOR_UPDATE));
}
var s:String = MyJSONUtils.encode(this._currentItem);
logger.debug("-- cursor update , ："+s+"["+a+"]");
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
public function set cursor(cursor:IViewCursor):void{
this._cursor = cursor;
}
public function get cursor():IViewCursor{
return this._cursor;
}
public function set currentItem(o:Object):void{
//
this.updateItem(o);
//this._currentItem = o;
}
public function get currentItem():Object{
return this._currentItem;
}
////////////////////////////////////////////////////////////////////////
public function fetchKeys():void{
if(this.length>0){
var o:Object = this.getItemAt(0);
this._keys = MyJSONUtils.fetchKeys(o);
}else{
this._keys = [];
}
}
public function getKeys():Array{
if(this._keys.length<=0){
this.fetchKeys();
}
return this._keys;
}
public function set keywords(k:Array):void{
this._keywords = k;
}
public function get keywords():Array{
return this._keywords;
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/**
* ??????
* @param Object json object eg:{name:"xxx_name", age:34 .....}
* @param String Sort
* @return int
*
* @see mx.collections.Sort
*/
public function checkExist(conditionObj:Object,mode:String=Sort.ANY_INDEX_MODE):int{
var sort:Sort = new Sort();
return sort.findItem(this.source,conditionObj,mode);
}
/**
* [ ]
* ， keys key ， ， key
* @param Object
* @param Array key
* @return Boolean true
*/
public function isExist(o:Object,keys:Array=null):Boolean{
var key1:Array = keys;
if(key1==null){
key1 = MyJSONUtils.fetchKeys(o);
}
var item1:String = null;
var l:int=key1.length;
for each(var obj:Object in this){
var flg:int = 0;
for(var i:int=0;i<l;i++){
item1=key1[i];
if(o[item1]==obj[item1]){
flg++;
}
}
if(flg==l)return true;
}
return false;
}
/**
* ，
* @param Object
* @return Boolean true
*/
override public function contains(item:Object):Boolean{
return isExist(item,this._keywords);
}
////////////////////////////////////////////////////////////////////////
/**
* ， :
* -- name : String 。
* -- caseInsensitive : Boolean 。
* -- descending : Boolean 。
* -- numeric : Object (number/int/uint)
* ， 。
* eg:[{name:'age',caseInsensitive:true,descending:false,numeric:null},
* {name:'age',descending:false}...]
* ， json ， ：name,caseInsensitive,descending,numeric,
* ，name ， 。
* @param Object
* @return
* @see mx.colloections.SortField
*
*/
public function sortCollection(conditionObj:Array):void{
var leng:int = conditionObj.length;
var fields:Array = [];
var sortField:SortField = null;
var o:Object=null;
var name:String=null;
var caseInsensitive:Boolean=false;
var descending:Boolean = false;
var numeric:Object = null;
for(var i:int=0;i<leng;i++){
o = conditionObj[i];
sortField = new SortField();
//
sortField.name=o[MyArrayCollection.RL_NAME];
var tmp:Object = o[MyArrayCollection.RL_CASEINSENSITIVE];
caseInsensitive=tmp==null?false:true;
sortField.caseInsensitive=caseInsensitive;
tmp = o[MyArrayCollection.RL_DESCENDING];
descending=tmp==null?false:true;
sortField.descending=descending;
tmp = o[MyArrayCollection.RL_NUMERIC];
numeric=tmp==null?null:tmp;
sortField.numeric=numeric;
//
fields.push(sortField);
}
var sort:Sort = new Sort();
sort.fields=fields;
this.sort = sort;
this.refresh();
}
////////////////////////////////////////////////////////////////////////
/**
* ， ，
* coll = new ArrayCollection([
* {name:"Martin Foo", age:25},
* {name:"Joe Bar", age:15},
* {name:"John Baz", age:23},
* {name:"Matt Baz", age:21}]);
* ｆｕｎｃ：
* private function filterFunc(value:Object):Object {
* if(Number(value.age) > 21) {
* return true;
* }
* return false;
*}
* @param Function
* @return
*/
public function filterCollection(filterFunc:Function):void{
this.filterFunction = filterFunc;
this.refresh();
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/**
* ， cursorMove
* @param Boolean
* @return Object
*/
public function firstItem(cursorMove:Boolean=true):Object{
if(cursorMove){
return this.moveFirst();
}
return this.getItemAt(0);
}
/**
* ， cursorMove
* @param Boolean
* @return Object
*/
public function lastItem(cursorMove:Boolean=true):Object{
if(cursorMove){
return this.moveLast();
}
return this.getItemAt(this.length-1);
}
/**
* , .
* @param Object
* @return Boolean true false
*/
public function appendItem(o:Object):Boolean{
//
var exist:Boolean= this.contains(o);
if(!exist){
this.addItem(o);
//
this.moveCursorTo(o);
if(this._currentItem){
return true;
}
}
return false;
}
/**
*
* @param Object
* @return Boolean
*/
public function insertItem(o:Object):Boolean{
//
var exist:Boolean= this.contains(o);
if(!exist){
this._cursor.insert(o);
//
this.moveCursorTo(o);
if(this._currentItem){
return true;
}
}
return false;
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/**
* ， , ，
* @return Object
*
*/
public function remove():Object {
var o:Object=this._cursor.remove();
if (!this._currentItem) {
this._cursor.movePrevious();
}
return o;
}
/**
*
* @param Object
* @return Boolean true
*/
public function removeItem(o:Object):Boolean{
this.moveCursorTo(o);
var o:Object = this.remove();
if(o)return true;
return false;
}
/**
*
*/
override public function removeAll():void{
super.removeAll();
this.source = [];
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/**
*
* @param Object
* @return
*/
public function updateItem(o:Object):void{
var keys:Array = MyJSONUtils.fetchKeys(o);
var l:int = keys.length;
var key:String=null;
for(var i:int=0;i<l;i++){
key = keys[i];
if(this._currentItem[key]){
this._currentItem[key]=o[key];
this.itemUpdated(this._currentItem);// ui
}
}
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/**
* ,
* @param Object
* @return Object
*/
public function moveCursorTo(o:Object):Object {
//
var index:int=this.getItemIndex(o);
return this.moveCursorByIndex(index);
}
public function moveCursorByIndex(index:int):Object{
if(index < 0 || index >= this.length)return null;
var oldIndex:int = this.getItemIndex(this._currentItem);
var offset:int = 0;
if (oldIndex > index) {
offset = -(oldIndex - index);
} else if (oldIndex < index) {
offset = index - oldIndex;
}
this._cursor.seek(this._cursor.bookmark, offset);
return this._currentItem;
}
/**
* ,
* @return Object
*/
public function moveFirst():Object{
//
this._cursor.seek(CursorBookmark.FIRST);
//
// cursor update
//
return this._currentItem;
}
/**
* ,
* @return Object
*/
public function moveLast():Object{
//
this._cursor.seek(CursorBookmark.LAST);
//
// cursor update
//
return this._currentItem;
}
/**
* ，
* @return Object
*/
public function moveNext():Object {
if (!this._cursor.afterLast) {
this._cursor.moveNext();
//this._currentItem = this._cursor.current;
if (!this._currentItem) {
this._cursor.movePrevious();
}
}
return this._currentItem;
}
/**
* ，
* @return Object
*/
public function movePrevious():Object {
if (!this._cursor.beforeFirst) {
this._cursor.movePrevious();
if (!this._currentItem) {
this._cursor.moveNext();
}
}
return this._currentItem;
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/**
*
* @return String
*/
override public function toString():String{
var s:String = "";
var l:int=this.length;
for(var i:int=0;i<l;i++){
s+=MyJSONUtils.encode(this.getItemAt(i));
}
return s;
}
}//end class
}//end package