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.
<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>
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
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();
}
}
}
See Also