Determining when the selected item changes on the FxButtonBar control in Flex Gumbo

The following example shows how you can determine when the selected item changes on the Flex Gumbo FxButtonBar control by listening for the selectionChanging or selectionChanged events.

Full code after the jump.

To use the following code, you must have Flash Player 10 and a Flex Gumbo SDK installed in your Flex Builder 3. For more information on downloading and installing the Gumbo SDK into Flex Builder 3, see “Using the beta Gumbo SDK in Flex Builder 3”.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/02/10/determining-when-the-selected-item-changes-on-the-fxbuttonbar-control-in-flex-gumbo/ -->
<Application name="FxButtonBar_selectionChanged_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <Script>
        <![CDATA[
            import mx.events.IndexChangedEvent;

            private function btn_selectionChanging(evt:IndexChangedEvent):void {
                arrColl.addItem(evt);
            }

            private function btn_selectionChanged(evt:IndexChangedEvent):void {
                arrColl.addItem(evt);
            }
        ]]>
    </Script>

    <Declarations>
        <ArrayCollection id="arrColl" />
    </Declarations>

    <ApplicationControlBar dock="true">
        <Form styleName="plain">
            <FormItem label="requiresSelection:">
                <FxCheckBox id="checkBox" />
            </FormItem>
            <FormItem>
                <FxButtonBar id="btnBar"
                        requiresSelection="{checkBox.selected}"
                        selectionChanging="btn_selectionChanging(event);"
                        selectionChanged="btn_selectionChanged(event);">
                    <dataProvider>
                        <ArrayCollection source="[One,Two,Three,Four,Five]" />
                    </dataProvider>
                </FxButtonBar>
            </FormItem>
        </Form>
    </ApplicationControlBar>

    <DataGrid id="dataGrid"
            dataProvider="{arrColl}"
            width="100%">
        <columns>
            <DataGridColumn dataField="type" />
            <DataGridColumn dataField="oldIndex" />
            <DataGridColumn dataField="newIndex" />
        </columns>
    </DataGrid>

</Application>

This entry is based on a beta version of the Flex Gumbo SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex Gumbo SDK.

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