Controlling a Tree control’s item indentation in Flex

The following example shows how you can control the amount of indentation for a child node in a Flex Tree control.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/11/27/controlling-a-tree-controls-item-indentation-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:XMLListCollection id="xmlListColl">
        <mx:source>
            <mx:XMLList>
                <node label="One">
                    <node label="One.1">
                        <node label="One.1.1">
                            <node label="One.1.1.1">
                                <node label="One.1.1.1.1" />
                            </node>
                        </node>
                    </node>
                    <node label="One.2" />
                    <node label="One.3" />
                </node>
                <node label="Two">
                    <node label="Two.1" />
                    <node label="Two.2" />
                    <node label="Two.3" />
                </node>
            </mx:XMLList>
        </mx:source>
    </mx:XMLListCollection>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="indentation:">
                <mx:HSlider id="slider"
                        minimum="0"
                        maximum="30"
                        value="17"
                        liveDragging="true"
                        snapInterval="1"
                        tickInterval="1"
                        labels="[0,30]" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:Tree id="tree"
            dataProvider="{xmlListColl}"
            labelField="@label"
            width="300"
            rowCount="6"
            indentation="{slider.value}" />

</mx:Application>

View source is enabled in the following example.