Map Tip Binding

NeilMoore — Wed, 09 Apr 2014 07:38:53 GMT

Hi All,

I know there are a couple of other threads on this but I've been through them and while my example seems to be similar to the suggested solutions in those, it still hasn't resolved my issue.

The problem I have is that the map tips appear with no text in them. I have included a screen grab to illustrate the issue.

[ATTACH=CONFIG]32944[/ATTACH]

The problem seems to be that the DataContext is null and I'm not sure why this would be.

I have included my code below.

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:wpftoolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit"
        xmlns:local="clr-namespace:WpfApplication5"
        xmlns:esri="http://schemas.esri.com/arcgis/client/2009" x:Class="WpfApplication5.MainWindow"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:TestConverter x:Key="Conv" />
        <local:VM x:Key="VM" />
        <esri:MarkerSymbol x:Key="SupplierMarker" >
            <esri:MarkerSymbol.ControlTemplate>
                <ControlTemplate>
                    <Ellipse Width="15" Height="15" 
                            Fill="Gold" Stroke="Black" 
                            Margin="-7.5 -7.5 0 0" />
                </ControlTemplate>
            </esri:MarkerSymbol.ControlTemplate>
        </esri:MarkerSymbol>

    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource VM}}">
        <esri:Map WrapAround="True">
            <esri:ArcGISTiledMapServiceLayer Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
            <esri:GraphicsLayer>
                <esri:GraphicsLayer.GraphicsSource>
                    <esri:PointDataSource ItemsSource="{Binding Path=SList, Source={StaticResource VM}}"
                                          XCoordinateBinding="{Binding Long}"
                                          YCoordinateBinding="{Binding Lat}" />
                </esri:GraphicsLayer.GraphicsSource>
                <esri:GraphicsLayer.Renderer>
                    <esri:SimpleRenderer Symbol="{StaticResource SupplierMarker}" />
                </esri:GraphicsLayer.Renderer>
                <esri:GraphicsLayer.MapTip>
                    <Border Padding="4,2" Background="Black">
                        <StackPanel>
                            <TextBlock Foreground="White">
                            <Run Text="{Binding [Name]}" />
                            </TextBlock>
                        </StackPanel>
                    </Border>
                </esri:GraphicsLayer.MapTip>
            </esri:GraphicsLayer>

        </esri:Map>
    </Grid>
</Window>

    class VM : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            var eventToFire = PropertyChanged;
            if (eventToFire == null)
                return;

            eventToFire(this, new PropertyChangedEventArgs(propertyName));
        }

        private List<Pin> _SList;
        public List<Pin> SList
        {
            get
            {
                return _SList;
            }
            set
            {
                if (_SList != value)
                {
                    _SList = value;
                    OnPropertyChanged("SList");
                }
            }
        }


        public VM()
        {
            SList = new List<Pin>()
                {
                    new Pin() { Name = "Somewhere" , Lat = 52.4790684, Long = -0.9117778 },
                    new Pin() { Name = "Test", Lat = 52.4803692, Long = -0.9232606 }
                };
        }

    }

If anyone could shed any light on this I would be really grateful.

Many thanks in advance,

Neil.

Re: Map Tip Binding

AnttiKajanus1 — Sat, 11 Dec 2021 21:04:30 GMT

MapTips has DataContext of an Graphic and you can access the Model class through Attribute called "DataContext". This should help you to access to the properties of the model like this:

<Run Text="{Binding [DataContext].Name}" />

topic Map Tip Binding in ArcGIS Runtime SDK for WPF (Retired) Questions

Map Tip Binding

Re: Map Tip Binding