Levels in .NET MAUI TreeMap (SfTreeMap)

16 Jul 202624 minutes to read

NOTE

Prerequisite: Ensure that the required NuGet package is installed, the necessary namespaces are imported, and the TreeMap control is properly configured in your application. For detailed setup and configuration instructions, refer to the Getting Started guide.

Levels in .NET MAUI TreeMap allow for hierarchical data visualization, enabling multi-level categorization and exploration of complex datasets. The TreeMap supports n number of levels and each level is separated using the GroupPath property.

Group Path

The GroupPath property of TreeMapLevel specifies the name of the property in the data object that determines how items in the TreeMap are grouped. The grouping is based on the values of this property in the data source, which splits the level into distinct groups.

The following example shows how levels are added, and each level is configured using the GroupPath.

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
       <treemap:TreeMapLevel GroupPath="Continent"/>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() { GroupPath = "Continent"});
this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}

Customize level appearance

The level appearance customization can be achieved by using the Spacing, Stroke, StrokeWidth, TextStyle, and Background properties of TreeMapLevel in the SfTreeMap.

Customize level appearance using spacing

The Spacing property of TreeMapLevel can be customized by using the Levels property in the SfTreeMap. It is used to customize the spacing between the TreeMap header items, with a default value of 1.

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
        <treemap:TreeMapLevel GroupPath="Continent"
                              Spacing="3"/>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() { GroupPath = "Continent", Spacing = 3 });
this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}

Customize level appearance using header height

The HeaderHeight property of TreeMapLevel can be customized using the Levels property in the SfTreeMap. This property adjusts the header height for each level in the TreeMap, with a default value of 24.

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
        <treemap:TreeMapLevel GroupPath="Continent"
                              HeaderHeight="20"/>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() { GroupPath = "Continent", HeaderHeight = 20 });
this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}

Customize level appearance using background

The Background property of TreeMapLevel can be customized by using the Levels property in the SfTreeMap. It is used to customize the background brush for the TreeMap header items. The default value of Background is null.

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
        <treemap:TreeMapLevel GroupPath="Continent"
                              Background="LightGreen"/>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() { GroupPath = "Continent", Background = Brush.LightGreen });
this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}

NOTE

To customize the same background color for both header and leaf items at each level, utilize the GroupItemBrushSettings property.

Customize level appearance using stroke

The Stroke property of TreeMapLevel can be customized by using the Levels property in the SfTreeMap. It is used to customize the stroke color for the TreeMap header items. The default value of Stroke is new SolidColorBrush(Colors.LightGray).

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
        <treemap:TreeMapLevel GroupPath="Continent"
                              Stroke="Red"/>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() { GroupPath = "Continent", Stroke = Colors.Red });
this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}

Customize level appearance using stroke width

The StrokeWidth property of TreeMapLevel can be customized by using the Levels property in the SfTreeMap. It is used to customize the width of the stroke for the TreeMap header items. The default value of StrokeWidth is 1.

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
        <treemap:TreeMapLevel GroupPath="Continent"
                              StrokeWidth="3"/>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() { GroupPath = "Continent", StrokeWidth = 3 });
this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}

Customize level appearance using text style

The TextStyle property of TreeMapLevel can be customized using the Levels property in the SfTreeMap. It is used to customize the TextColor, FontSize, FontFamily, and FontAttributes of TreeMap header item text.

XAML

<treemap:SfTreeMap x:Name="treeMap"
                   DataSource="{Binding PopulationDetails}"
                   PrimaryValuePath="Population">
    <treemap:SfTreeMap.BindingContext>
        <local:PopulationViewModel />
    </treemap:SfTreeMap.BindingContext>
    <treemap:SfTreeMap.LeafItemSettings>
        <treemap:TreeMapLeafItemSettings LabelPath="Country">
        </treemap:TreeMapLeafItemSettings>
    </treemap:SfTreeMap.LeafItemSettings>
    <treemap:SfTreeMap.LeafItemBrushSettings>
        <treemap:TreeMapUniformBrushSettings Brush="Orange"/>
    </treemap:SfTreeMap.LeafItemBrushSettings>
    <treemap:SfTreeMap.Levels>
        <treemap:TreeMapLevel GroupPath="Continent">
            <treemap:TreeMapLevel.TextStyle>
                <treemap:TreeMapTextStyle TextColor="Red"
                                          FontSize="14"
                                          FontAttributes="Italic"/>
            </treemap:TreeMapLevel.TextStyle>
        </treemap:TreeMapLevel>
    </treemap:SfTreeMap.Levels>
</treemap:SfTreeMap>

C#

SfTreeMap treeMap = new SfTreeMap();
PopulationViewModel viewModel = new PopulationViewModel();
treeMap.DataSource = viewModel.PopulationDetails;
treeMap.PrimaryValuePath = "Population";
treeMap.LeafItemBrushSettings = new TreeMapUniformBrushSettings() { Brush = Brush.Orange };
treeMap.LeafItemSettings = new TreeMapLeafItemSettings() { LabelPath = "Country" };
treeMap.Levels.Add(new TreeMapLevel() 
{ 
    GroupPath = "Continent",
    TextStyle = new TreeMapTextStyle() { TextColor = Colors.Red, FontSize = 14, FontAttributes = FontAttributes.Italic },
});

this.Content = treeMap;

PopulationDetails.cs

/// <summary>    
/// Represents the custom data properties.
/// </summary>
public class PopulationDetails
{
    public string Country { get; set; }
    public string Continent { get; set; }
    public int Population { get; set; }
}

PopulationViewModel.cs

/// <summary>    
/// Represents demographic information for countries in the Americas for the year 2023.
/// </summary>
public class PopulationViewModel
{
    public PopulationViewModel()
    {
        this.PopulationDetails = new ObservableCollection<PopulationDetails>()
        {
            new PopulationDetails() { Continent ="North America", Country = "United States of America", Population = 339996564 },
            new PopulationDetails() { Continent ="South America", Country = "Brazil", Population = 216422446 },
            new PopulationDetails() { Continent ="North America", Country = "Mexico", Population = 128455567 },
            new PopulationDetails() { Continent ="South America", Country = "Colombia", Population = 52085168 },
            new PopulationDetails() { Continent ="South America", Country = "Argentina", Population = 45773884 },
            new PopulationDetails() { Continent ="North America", Country = "Canada", Population = 38781292 },
            new PopulationDetails() { Continent ="South America", Country = "Peru", Population = 34352719 },
            new PopulationDetails() { Continent ="South America", Country = "Venezuela", Population = 28838499 },
            new PopulationDetails() { Continent ="South America", Country = "Chile", Population = 19629590 },
            new PopulationDetails() { Continent ="South America", Country = "Ecuador", Population = 18190484 },
            new PopulationDetails() { Continent ="North America", Country = "Guatemala", Population = 18092026 },
            new PopulationDetails() { Continent ="South America", Country = "Bolivia", Population = 12388571 },
            new PopulationDetails() { Continent ="North America", Country = "Honduras", Population = 10593798 },
            new PopulationDetails() { Continent ="North America", Country = "Nicaragua", Population = 7046311 },
            new PopulationDetails() { Continent ="South America", Country = "Paraguay", Population = 6861524 },
            new PopulationDetails() { Continent ="North America", Country = "El Salvador", Population = 6364943 },
            new PopulationDetails() { Continent ="North America", Country = "Costa Rica", Population = 5212173 },
            new PopulationDetails() { Continent ="South America", Country = "Uruguay", Population = 3423109 },
        };
    }

    public ObservableCollection<PopulationDetails> PopulationDetails
    {
        get;
        set;
    }
}