Using IViewCursor for Navigation

The Below code is example for using IViewCursor for ArrayCollection Navigation

<?xml version=”1.0″?>
<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml&#8221; initialize=”run();”>
<mx:Script>
<![CDATA[
import mx.collections.*;
private var myCursor:IViewCursor;
[Bindable]
public var myAC:ArrayCollection;
public var myArray:Array = [ { label:1, data:”One” }, { label:2, data:”Two” }, { label:3, data:”Three” }, { label:4, data:”Four” }, { label:5, data:”Five” },
{ label:6, data:”Six” }, { label:7, data:”Seven” }, { label:8, data:”Eight” }, { label:9, data:”Nine” }, {label:10, data:”Ten”}];

public function run():void {
myAC = new ArrayCollection(myArray);
myCursor=myAC.createCursor();
var sort:Sort = new Sort();
sort.fields = [new SortField(“label”)];
myAC.sort=sort;
myAC.refresh();
first.enabled = false;
back.enabled = false;
}
public function countLast(theCursor:IViewCursor):int {
var counter:int=0;
var mark:CursorBookmark=theCursor.bookmark;
while (theCursor.moveNext()) {
counter++;
}
theCursor.seek(mark);
return counter;
}
public function countFromSelection():void {
myCursor.findAny(myCB.selectedItem);
var count:int = countLast(myCursor);
ta1.text = “cursor is at: ” + myCursor.current.label;
enableDisableButtons();
}
public function nextCollection():void {
if(! myCursor.afterLast) {
myCursor.moveNext();
ta1.text=”cursor is at: ” + myCursor.current.label;
}
}
public function backCollection():void {
if(!myCursor.beforeFirst) {
myCursor.movePrevious();
ta1.text=”cursor is at: ” + myCursor.current.label;
}
}
public function firstCollection():void {
myCursor.seek(CursorBookmark.FIRST);
ta1.text=”cursor is at: ” + myCursor.current.label;
}
public function lastCollection():void {
myCursor.seek(CursorBookmark.LAST);
ta1.text=”cursor is at: ” + myCursor.current.label;
}
public function navigate(event:MouseEvent):void {
switch(event.currentTarget.label) {
case ‘first’:
firstCollection();
break;
case ‘back’:
backCollection();
break;
case ‘next’:
nextCollection();
break;
case ‘last’:
lastCollection();
break;
}
enableDisableButtons()
}
public function enableDisableButtons():void{
var firstInCollection:Boolean = myAC.getItemAt(0) == myCursor.current;
first.enabled = back.enabled = !firstInCollection
var lastInCollection:Boolean = myAC.getItemAt(myAC.length – 1) == myCursor.current;
last.enabled = next.enabled = !lastInCollection;
}
]]>
</mx:Script>
<mx:ComboBox id=”myCB” dataProvider=”{myAC}” change=”countFromSelection();”/>
<mx:TextArea id=”ta1″ height=”200″ width=”175″/>
<mx:HBox>
<mx:Button label=”first” id=”first” click=”navigate(event)”/>
<mx:Button label=”back” id=”back” click=”navigate(event)”/>
<mx:Button label=”next” id=”next” click=”navigate(event)”/>
<mx:Button label=”last” id=”last” click=”navigate(event)”/>
</mx:HBox>
</mx:Application>

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