TreeMapFlatDataAdapter Class

The data adapter that provides flat data to a tree map.

Assembly: DevExpress.Xpf.TreeMap.v24.2.dll

NuGet Package: DevExpress.Wpf.TreeMap

Declaration

C#
VB.NET

public class TreeMapFlatDataAdapter :
    TreeMapDataAdapterBase,
    IFlatDataAdapter,
    IGroupIndexProvider

Public Class TreeMapFlatDataAdapter
    Inherits TreeMapDataAdapterBase
    Implements IFlatDataAdapter,
               IGroupIndexProvider

Remarks

This data adapter introduces the TreeMapFlatDataAdapter.DataSource property that allows you to specify the data source of the adapter, and the TreeMapFlatDataAdapter.DataMember, TreeMapFlatDataAdapter.LabelDataMember and TreeMapFlatDataAdapter.ValueDataMember properties, allowing you to specify the data members whose values are used as an item, item’s label and item’s value.

Example

To provide flat data to the Tree Map, perform the following steps.

Assign a new TreeMapFlatDataAdapter object to the TreeMapControl.DataAdapter property.
Specify the adapter’s TreeMapFlatDataAdapter.DataSource, TreeMapFlatDataAdapter.LabelDataMember and TreeMapFlatDataAdapter.ValueDataMember properties.
Optionally, to group automatically generated tree map items, add the TreeMapGroupDefinition to the TreeMapFlatDataAdapter.Groups collection, and specify the definition’s TreeMapGroupDefinition.GroupDataMember and TreeMapGroupDefinition.HeaderContentTemplate properties.

MainWindow.xaml

<Window.Resources>
    <XmlDataProvider 
        x:Key="gdpDataSource" 
        Source="Data/top10gdp.xml"/>
    <DataTemplate 
        x:Key="headerTemplate">
        <Border 
            BorderBrush="#606060" 
            BorderThickness="1" 
            Margin="4,4,4,-4">
            <TextBlock 
                Padding="6,2,0,2"
                Text="{Binding Label}"
                Background="#808080"
                Foreground="White"/>
        </Border>
    </DataTemplate>
</Window.Resources>
<Grid>
    <dxtm:TreeMapControl>
        <dxtm:TreeMapControl.Colorizer>
            <dxtm:TreeMapPaletteColorizer>
                <dxtm:Office2016Palette/>
            </dxtm:TreeMapPaletteColorizer>
        </dxtm:TreeMapControl.Colorizer>
        <dxtm:TreeMapFlatDataAdapter 
            DataSource="{Binding Source={StaticResource gdpDataSource}}"
            DataMember="Country"
            LabelDataMember="Name"
            ValueDataMember="Gdp">
            <dxtm:TreeMapFlatDataAdapter.Groups>
                <dxtm:GroupDefinitionCollection>
                    <dxtm:TreeMapGroupDefinition 
                        GroupDataMember="SideOfWorld"
                        HeaderContentTemplate="{Binding Source={StaticResource headerTemplate}}"/>
                </dxtm:GroupDefinitionCollection>
            </dxtm:TreeMapFlatDataAdapter.Groups>
        </dxtm:TreeMapFlatDataAdapter>
    </dxtm:TreeMapControl>
</Grid>