HeatmapControl.SelectionMode Property

Gets or sets the selection mode for heatmap cells.

Namespace: DevExpress.Xpf.Charts.Heatmap

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

NuGet Package: DevExpress.Wpf.Charts

Declaration

C#

[NonCategorized]
public ElementSelectionMode SelectionMode { get; set; }

VB.NET

<NonCategorized>
Public Property SelectionMode As ElementSelectionMode

Property Value

Type	Description
ElementSelectionMode	A value that identifies the selection mode.

Available values:

Name	Description	Image
None	A user cannot select heatmap cells.
Single	A user can select a single heatmap cell.
Multiple	A user can select multiple heatmap cells.
Extended	A user can select a single heatmap cell. A user can hold down the Ctrl key to select multiple cells.

Example

The following example shows how to use heatmap selected cell data as a source for another chart:

XAML

<dxh:HeatmapControl x:Name="heatmap" 
                    Grid.Row="0" Margin="10" 
                    SelectionMode="Multiple"
                    SelectedItems="{Binding SelectedSales, Mode=TwoWay}" 
                    ToolTipEnabled="True">
    <dxh:HeatmapDataSourceAdapter
        DataSource="{Binding Sales}"
        XArgumentDataMember="Month"
        YArgumentDataMember="Product"
        XArgumentComparer="{local:SaveOrderComparer}"
        ColorDataMember="RevenueByMonth"/>
        <!--...-->
</dxh:HeatmapControl>

<dxc:ChartControl x:Name="chart" Grid.Row="1"
    DataSource="{Binding SelectedSales, Converter={local:SelectedItemsToDataSourceConverter}}" 
    BorderBrush="Transparent">
    <!--...-->
</dxc:ChartControl>

C#

public class InteractionViewModel : BindableBase {
    //...

    readonly List<ProductSale> sales;
    ObservableCollection<object> selectedSales;

    public List<ProductSale> Sales { get { return sales; } }
    public virtual ObservableCollection<object> SelectedSales {
        get { return selectedSales; }
        set {
            if (selectedSales == value)
                return;
            selectedSales = value;
            if (selectedSales != null)
                selectedSales.CollectionChanged += (s, e) => RaisePropertyChanged("SelectedSales");
            RaisePropertyChanged("SelectedSales");
        }
    }
    protected InteractionViewModel() {
        sales = LoadData();
        SelectedSales = new ObservableCollection<object>() { sales[0] };
    }
    //...
}

VB.NET

    Public Class InteractionViewModel
        Inherits DevExpress.Mvvm.BindableBase
        '...
        Private ReadOnly salesField As System.Collections.Generic.List(Of TreeMapDemo.ProductSale)

        Private selectedSalesField As System.Collections.ObjectModel.ObservableCollection(Of Object)

        Public ReadOnly Property Sales As List(Of TreeMapDemo.ProductSale)
            Get
                Return Me.salesField
            End Get
        End Property

        Public Overridable Property SelectedSales As ObservableCollection(Of Object)
            Get
                Return Me.selectedSalesField
            End Get

            Set(ByVal value As ObservableCollection(Of Object))
                If Me.selectedSalesField Is value Then Return
                Me.selectedSalesField = value
                If Me.selectedSalesField IsNot Nothing Then AddHandler Me.selectedSalesField.CollectionChanged, Sub(s, e) Me.RaisePropertyChanged("SelectedSales")
                Me.RaisePropertyChanged("SelectedSales")
            End Set
        End Property

        Protected Sub New()
            Me.salesField = Me.LoadData()
            Me.SelectedSales = New System.Collections.ObjectModel.ObservableCollection(Of Object)() From {Me.salesField(0)}
        End Sub
        ' ...
    End Class

For a complete source code, see the Selection demo:

Run Demo