TreeMapFlatDataAdapter.Groups Property

Gets or sets the collection of TreeMapGroupDefinition objects used to group tree map items.

Assembly : DevExpress.Xpf.TreeMap.v25.2.dll

NuGet Package : DevExpress.Wpf.TreeMap

Declaration

C#
VB.NET

csharp

public GroupDefinitionCollection Groups { get; set; }

Public Property Groups As GroupDefinitionCollection

Property Value

Type	Description
GroupDefinitionCollection

A GroupDefinitionCollection collection containing TreeMapGroupDefinition objects.

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

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>