[flexcoders] Setting new dataProvider and selectedIndex properties to HorizontalList simultaneously

[Sergey Kovalyov]

Hi All!

Unfortunately, setting new dataProvider and selectedIndex properties
to HorizontalList simultaneously does not always result in actually
selecting particular item. Sometimes the dataProvider changes, but
nothing is selected. You could find the simple code sample below.
What's wrong with it?

Sergey.

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
        creationComplete="onCreationComplete()"
        horizontalAlign="center"
        verticalAlign="middle">
        
        <mx:Script>
                <![CDATA[
                        import mx.collections.ArrayCollection;
                        import mx.controls.Alert;
                        
                        private var _dataProviders : ArrayCollection = new 
ArrayCollection();

                        [Bindable]
                        private var _dataProvider : ArrayCollection = new 
ArrayCollection();
                        
                        [Bindable]
                        private var _selectedIndex : int;
                        
                        private function onCreationComplete() : void {
                                _dataProviders.addItem(new ArrayCollection([1, 
2, 3]));
                                _dataProviders.addItem(new ArrayCollection([4, 
5, 6]));
                                _dataProviders.addItem(new ArrayCollection([7, 
8, 9, 10]));
                        }
                        
                        private function onSelectButtonClick() : void {
                                _dataProvider = 
_dataProviders[Math.floor(Math.random() *
_dataProviders.length)];
                                _selectedIndex = Math.floor(Math.random() * 
_dataProvider.length);
                        }
                        
                ]]>
        </mx:Script>
        
        <mx:HorizontalList id="horizontalList" dataProvider="{_dataProvider}"
selectedIndex="{_selectedIndex}">
                <mx:itemRenderer>
                        <mx:Component>
                                <mx:Box width="50" height="50">
                                        <mx:Label text="{data}" />
                                </mx:Box>
                        </mx:Component>
                </mx:itemRenderer>
        </mx:HorizontalList>
        
        <mx:Button label="Select" click="onSelectButtonClick()" />
        
</mx:Application>


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