VectorLayerBase.ToolTipPattern Property

Gets or sets a string which represents the pattern specifying the text to be displayed within a tooltip.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v23.2.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

[NonCategorized]
public string ToolTipPattern { get; set; }

VB.NET

<NonCategorized>
Public Property ToolTipPattern As String

Property Value

Type	Description
String	A System.String, which represents the tooltip pattern.

Remarks

The pattern string can contain placeholders that the Map Control replaces with specific values when generates the text for a map item. The tooltip pattern supports the following groups of placeholders:

Attribute Placeholders

These placeholders define values of map item attributes and enclosed with braces (“{“, “}”). For example the “{NAME}: ${GDP_MD_EST:#,0}M” pattern utilizes two placeholders. The first placeholder is for the NAME attribute and the second placeholder is for the GDP_MD_EST attribute. Note that the second placeholder uses the #,0 format string that goes after the “:” symbol.

Map Chart Value Placeholders

The Map Control uses this placeholder group to display map bubbles’ and map pies’ arguments and values in the tooltip. The “%” symbol encloses these placeholders. The following table lists available placeholders:

Placeholder	Placeholder’s meaning for Map Bubbles	Placeholder’s meaning for Map Pies
A	A map bubble’s argument.	Data objects’ PieItemDataMember field value when the Pie Chart Data adapter generates map pies.
V	A map bubble’s value.	A map pie’s total value.
A<index>	Is not supported.	An argument of a map pie segment with the specified index.
V<index>	Is not supported.	A value of a map pie segment with the specified index.

For example, the “%A0%: %V0%\r\n%A1%: %V1%\r\n%A2%: %V2%” pattern generates the text that displays the first three segments’ arguments and values.

The chart value attributes with indices are useful when the number of segments within map pies is known. You can utilize the VectorLayerBase.ToolTipContentTemplate property to manage the tooltip’s content when map pies have an unknown number of segments.

Example

This example illustrates how to display tooltips for shapes loaded from Shapefiles (Countries.dbf, Countries.shp).

Note that a tooltip displays information (a country name, population) for each map shape from Shapefiles.

To see information (a country name, population) obtained from a Shapefile on a toolltip, specify NAME and POP_EST attributes in the VectorLayerBase.ToolTipPattern property.

Then, enable map tooltips by setting the MapControl.ToolTipEnabled property to true.

MainWindow.xaml

<Window x:Class="ShowToolTips.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map"
        xmlns:local="clr-namespace:ShowToolTips"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:MapItemPopulationAttributeToStringTypeConverter x:Key="mapItemPopulationAttributeConverter"/>
        <local:MapItemGdpAttributeToStringTypeConverter x:Key="mapItemGdpAttributeConverter"/>
        <DataTemplate x:Key="tooltipContentTemplate">
            <StackPanel Orientation="Vertical" Margin="8">
                <TextBlock Text="{Binding ToolTipText}"
                           Foreground="White" FontSize="24"/>
                <TextBlock Text="{Binding Item, Converter={StaticResource mapItemGdpAttributeConverter}, StringFormat=GDP: {0:C0}M}"
                           Foreground="Gray" FontSize="12"/>
                <TextBlock Text="{Binding Item, Converter={StaticResource mapItemPopulationAttributeConverter}, StringFormat=Population: {0}}"
                           Foreground="Gray" FontSize="12"/>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>

    <Grid>
        <dxm:MapControl ToolTipEnabled="True">
            <dxm:VectorLayer  ToolTipPattern="{}{NAME}" 
                              ToolTipContentTemplate="{Binding Source={StaticResource tooltipContentTemplate}}">
                <dxm:ShapefileDataAdapter FileUri="/ShowToolTips;component/Data/Shapefiles/Countries.shp"/>
            </dxm:VectorLayer>
        </dxm:MapControl>
    </Grid>
</Window>

TypeConverters.vb

Imports DevExpress.Xpf.Map
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Globalization
Imports System.Linq
Imports System.Text
Imports System.Windows.Data

Namespace ShowToolTips
    Friend Class MapItemPopulationAttributeToStringTypeConverter
        Implements IValueConverter

        Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.Convert
            Dim title As ShapeTitle = TryCast(value, ShapeTitle)
            Dim item As MapItem
            If title Is Nothing Then
                item = TryCast(value, MapItem)
            Else
                item = title.MapShape
            End If

            If item Is Nothing Then
                Return Nothing
            End If

            Dim attr = item.Attributes("POP_EST")
            If attr Is Nothing Then
                Return Nothing
            End If

            Return attr.Value
        End Function

        Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
            Throw New NotImplementedException()
        End Function
    End Class

    Friend Class MapItemGdpAttributeToStringTypeConverter
        Implements IValueConverter

        Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.Convert
            Dim title As ShapeTitle = TryCast(value, ShapeTitle)
            Dim item As MapItem
            If title Is Nothing Then
                item = TryCast(value, MapItem)
            Else
                item = title.MapShape
            End If

            If item Is Nothing Then
                Return Nothing
            End If

            Dim attr = item.Attributes("GDP_MD_EST")
            If attr Is Nothing Then
                Return Nothing
            End If

            Return attr.Value
        End Function

        Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
            Throw New NotImplementedException()
        End Function
    End Class
End Namespace

TypeConverters.cs

using DevExpress.Xpf.Map;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Windows.Data;

namespace ShowToolTips {
    class MapItemPopulationAttributeToStringTypeConverter : IValueConverter {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
            ShapeTitle title = value as ShapeTitle;
            MapItem item;
            if (title == null)
                item = value as MapItem;
            else
                item = title.MapShape;

            if (item == null) return null;

            var attr = item.Attributes["POP_EST"];
            if (attr == null) return null;

            return attr.Value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
            throw new NotImplementedException();
        }
    }

    class MapItemGdpAttributeToStringTypeConverter : IValueConverter {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
            ShapeTitle title = value as ShapeTitle;
            MapItem item;
            if (title == null)
                item = value as MapItem;
            else
                item = title.MapShape;

            if (item == null) return null;

            var attr = item.Attributes["GDP_MD_EST"];
            if (attr == null) return null;

            return attr.Value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
            throw new NotImplementedException();
        }
    }
}