windowsforms-devexpress-dot-xtratreemap-dot-treemapcolorizerbase-f5bac7b5.md
Gets or sets a provider of values the colorizer uses to determine colors for treemap items.
Namespace : DevExpress.XtraTreeMap
Assembly : DevExpress.XtraTreeMap.v25.2.dll
NuGet Package : DevExpress.TreeMap
[DefaultValue(null)]
[XtraSerializableProperty(XtraSerializationVisibility.Hidden)]
public IColorizerValueProvider ValueProvider { get; set; }
<DefaultValue(Nothing)>
<XtraSerializableProperty(XtraSerializationVisibility.Hidden)>
Public Property ValueProvider As IColorizerValueProvider
| Type | Default | Description |
|---|---|---|
| IColorizerValueProvider | null |
An object of a class that implements the IColorizerValueProvider interface.
|
Treemap colorizers uses item values (TreeMapItem.Value, TreeMapFlatDataAdapter.ValueDataMember, or HierarchicalDataMapping.ValueDataMember) to determine colors. You can use the ValueProvider property to specify a custom value source for a colorizer.
If ValueProvider is specified, a custom colorizer also uses its returned values to determine colors.
The following example shows how to make a treemap colorizer determine item colors based on the bound data source’s “HPI” row values:
((TreeMapColorizerBase)treeMapControl1.Colorizer).ValueProvider = new ColorizerValueProvider();
//...
public class ColorizerValueProvider : IColorizerValueProvider {
double IColorizerValueProvider.GetValue(IHierarchicalItem item, int itemIndex) {
DataRowView row = item.Tag as DataRowView;
if (row != null)
return (double)row["HPI"];
return 0;
}
}
CType(treeMapControl1.Colorizer, TreeMapColorizerBase).ValueProvider = New ColorizerValueProvider()
'...
Public Class ColorizerValueProvider
Inherits IColorizerValueProvider
Private Function GetValue(ByVal item As IHierarchicalItem, ByVal itemIndex As Integer) As Double
Dim row As DataRowView = TryCast(item.Tag, DataRowView)
If row IsNot Nothing Then Return CDbl(row("HPI"))
Return 0
End Function
End Class
See Also