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Map tip doesn't work

DonFreeman

In the sample shown at
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#GraphicsMapTip

what is supposed to trigger the MyMap_PropertyChanged event? I have reproduced this code in my project (using a different map) but this event does not fire with a mouseover. Can someone help me out here?

Thanks

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Matrix_Solutions_Inc_Geomatics

was this ever resolved? I created a class inheriting the MapTip so that i can customize it but it doesnt show when i hover over the graphic, im pretty sure it has something to do with making a custom class of the map tip.

Imports System
Imports System.Net
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents
Imports System.Windows.Ink
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Shapes
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports System.Windows.Data
Imports System.Windows.Media.Imaging
Imports System.Windows.Navigation
Imports System.Windows.Controls.Primitives
Imports ESRI.ArcGIS.Client.Toolkit

Namespace UserControls
    ' <summary>
    ' </summary>
    <TemplateVisualState(Name:="Collapsed", GroupName:="ViewStates"), _
    TemplateVisualState(Name:="Expand", GroupName:="ViewStates"), _
    TemplatePart(Name:="MaptTipImage", Type:=typeof(Image))>
    Public Class ExtendedMapTip
        Inherits MapTip
        ' <summary>
        ' </summary>
#Region "Private fields"
        Private MaptTipImage As Image
#End Region

        Public Sub New()
            DefaultStyleKey = GetType(ExtendedMapTip)
        End Sub

#Region "Dependency Properties"

        ' <summary>
        ' Gets or sets a value indicating whether this control is expanded.
        ' </summary>
        ' <value>
        '  <c>true</c> if this instance is expanded; otherwise, <c>false</c>.
        ' </value>

#End Region

        ' <summary>
        ' </summary>

        Public Overrides Sub OnApplyTemplate()

            MyBase.OnApplyTemplate()
            MaptTipImage = TryCast(Me.GetTemplateChild("MaptTipImage"), Image)
            If MaptTipImage IsNot Nothing Then
                AddHandler MaptTipImage.MouseLeftButtonUp, AddressOf Image_Click
            End If

        End Sub

        Public Sub Image_Click(sender As Object, e As MouseButtonEventArgs) Handles Me.MouseLeftButtonUp
            Try

                Dim MapTipImage As Image = TryCast(sender, Image)

                If MapTipImage Is DBNull.Value Then
                    Return
                End If

                Dim Maptip As Grid = TryCast(MapTipImage.Parent, Grid)

                Me.HorizontalAlignment = HorizontalAlignment.Stretch
                Me.VerticalAlignment = VerticalAlignment.Stretch

            Catch generatedExceptionName As System.Exception
            End Try
        End Sub

    End Class
End Namespace

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    
    xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
    xmlns:local="clr-namespace:MatrixWebMap.UserControls"
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
    xmlns:converters="clr-namespace:MatrixWebMap.Converter"
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009" 
    xmlns:esriToolkit="clr-namespace:ESRI.ArcGIS.Client.Toolkit;assembly=ESRI.ArcGIS.Client.Toolkit"
    >
     <!-- Map Tip Style -->
    <Style x:Key="MapTipSkin" TargetType="esri:MapTip">
        <Setter Property="Background" Value="#000000"/>
        <Setter Property="Foreground" Value="#FFFFFF"/>
        <Setter Property="Height" Value="Auto" />
        <Setter Property="Opacity" Value="1"/>
        <Setter Property="BorderThickness" Value="2"/>
        <Setter Property="BorderBrush" Value="#FFFFFF"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="esri:MapTip">
                    <Grid x:Name="MapTipContents" MinWidth="50" Background="Black" Opacity="1" Width="Auto" Height="Auto">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Collapsed">
                                    <Storyboard>
                                        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="MapTipData" Storyboard.TargetProperty="Height">
                                            <SplineDoubleKeyFrame KeySpline="0.3,0 0,1" KeyTime="00:00:00.5" Value="0"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="MapTipData" Storyboard.TargetProperty="Width">
                                            <SplineDoubleKeyFrame KeySpline="0.3,0 0,1" KeyTime="00:00:00.5" Value="0"/>
                                        </DoubleAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Expanded">
                                    <Storyboard>
                                        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="MapTipData" Storyboard.TargetProperty="Height">
                                            <SplineDoubleKeyFrame KeySpline="0.3,0 0,1" KeyTime="00:00:00.5" Value="240"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="MapTipData" Storyboard.TargetProperty="Width">
                                            <SplineDoubleKeyFrame KeySpline="0.3,0 0,1" KeyTime="00:00:00.5" Value="360"/>
                                        </DoubleAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Grid x:Name="MapTip" MinWidth="50" Background="Black" Opacity="0.8" Width="Auto" Height="Auto">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="20"/>
                                <RowDefinition Height="*"/>
                            </Grid.RowDefinitions>
                            <Border Grid.RowSpan="2" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="5"/>
                            <Polyline Fill="{TemplateBinding Background}" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="{TemplateBinding BorderThickness}" Points="0,10 -10,-10 10,0"/>
                            <ContentPresenter Margin="5,5,5,0" Content="{TemplateBinding Title}"/>
                            <data:DataGrid x:Name="MapTipData" Height="0" Margin="5,5,5,5" Width="0" Grid.Column="0" Grid.Row="12" Foreground="White" RowBackground="#555555" AlternatingRowBackground="Black" AutoGenerateColumns="True" HeadersVisibility="None" ItemsSource="{TemplateBinding ItemsSource}" RowStyle="{StaticResource DataGridRowStyle}" />
                        </Grid>
                        <Image x:Name="MapTipImage" Source="{Binding [FileLink]}" Margin="5,5,5,5" HorizontalAlignment="Center" Opacity="1" VerticalAlignment="Bottom" Width="Auto" Height="Auto" MaxHeight="{Binding ElementName=MapTipData, Path=Height}" MaxWidth="{Binding ElementName=MapTipData, Path=Width}" >
                            <Image.Triggers>
                                <EventTrigger RoutedEvent="Image.Loaded">
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <DoubleAnimation Storyboard.TargetName="MapTipContents" Storyboard.TargetProperty="Height" To="600"/>
                                            <DoubleAnimation Storyboard.TargetName="MapTipContents" Storyboard.TargetProperty="Width" To="800"/>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </EventTrigger>
                            </Image.Triggers>
                        </Image>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

SergioGalindo

Hi dominique,

I just realized I was making a really dumb mistake at:

this.TextBlockGeografia.SetBinding(TextBox.TextProperty, binding);

Of course, it should be: TextBlock.TextProperty

Oops!!!

I omitted the binding's source setting as you sugestted and it worked fine.

1000 thanks for your help.

DominiqueBroux

The datacontext of a maptip is set to the attributes dictionary by the framework.

So I think your code should be:

Binding binding = newBinding(string.Format("[{0}]", NameField));
// binding.Source = g;

i.e bind to [<attributeName>] instead of Attributes[<attributeName>] and dont set the source of the binding.

That being said I am not sure this explains the exception. In your code, where is coming your TextBlockGeographia from?

SergioGalindo

Hi,

I've created a user control meant to be used as a custom maptip. I need to set up the binding for a textblock to an attribute in my graphicslayer graphics in the code behind at runtime (because sometimes i nedd to bind to attribute1, others to attribute2).

This is my code:

public CustomMaptip(LeyendaConsulta legend, string NameField, Graphic g)
{
InitializeComponent();
this._nombreCampoGeografia = nombreCampoGeografia;
Binding binding = new Binding(string.Format("Attributes[{0}]", NameField));
binding.Source = g;
this.TextBlockGeografia.SetBinding(TextBox.TextProperty, binding);
this.Legend.Content = legend;
}

I 've tried setting binding.source to the graphic, graphicslayer, the attribute collection... but it always raise an exception at the SetBinding call. I'm lost!!!!

Thanks in advance

JenniferNery

This seems like a related thread: http://forums.arcgis.com/threads/25018-MapTips-widget-Vs-Graphic-MapTips-Vs-InfoWindow-(which-one-to-use-).

If you do not need the maptip to show on mouse hover for the dynamic layer, you can use InfoWindow instead.

The fields displayed in a MapTip is dependent on the template you provided and the OutFields from your query. If the template and/or OutFields only include project number and name, then these will be the only fields displayed in your MapTip. The map tip is also expected to close immediately unless hovered by mouse or MapTipHideDelay is set.

DonFreeman

dbroux -
Thanks, this does not help. Same result.

DominiqueBroux

Try by initializing 'ReturnGeometry' to true (depending on the service, the defaut value can be true or false, so...).

 
.....
query.OutFields.Add("*");

query.ReturnGeometry = true;
.......

DonFreeman

The maptip will appear with a mouseover and will show only a couple of fields such as project number and name, and will close when mouseleave. The identify will operate with a mouseclick and will show all the fields (there are many). There are 3 samples that I can find on the esri site. Two use a TiledMapServiceLayer, and one uses a FeatureLayer. Does this suggest that the maptip cannot be done with a DynamicServiceLayer? I didn't quite follow your initial suggestion about the "buddy layer".

Also, in looking at this code from one of the samples

void Layers_LayersInitialized(object sender, EventArgs args)
   {
   ESRI.ArcGIS.Client.Tasks.Query query = new ESRI.ArcGIS.Client.Tasks.Query()
   {
    Geometry = MyMap.Extent,
    OutSpatialReference = MyMap.SpatialReference
   };
   query.OutFields.Add("*");

   QueryTask queryTask = new QueryTask("http://gismaps.pagnet.org/ArcGIS/rest/services/Interactive_TIP_2011/MapServer/1");
   queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;
   queryTask.ExecuteAsync(query);
   }

  private void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
   {
   FeatureSet featureSet = args.FeatureSet;

   GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
   MyMapTip.GraphicsLayer = graphicsLayer;
   
   if (featureSet != null && featureSet.Features.Count > 0)
    {
    foreach (Graphic feature in featureSet.Features)
     {
     feature.Symbol = LayoutRoot.Resources["DefaultMarkerSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol;
     graphicsLayer.Graphics.Add(feature);
     }
     
    }
   }

This is from the toolkit maptip.
As I try to understand this, it appears that the graphics layer is initially empty but is populated with a symbol for each feature when it loads, and that each graphic symbol collects the data at that time. This then places all the maptip data in the page from the beginning so that it is instantly available without further query. Correct? As an aside, why don't we "see" the graphics on the graphics layer?

As I run the above code, it loops through the foreach appropriately so I think I am good to that point, but I still don't get anything to popup. It would be nice if I could view source to see what's actually on the page. 😞

DanielWalton

What is the difference in function between the maptip and the identify? And yes, if you want to use maptips, you have to use GraphicsLayer (i.e. FeatureLayer). FeatureLayer is easier to code against, but if your service returns a lot of features, the client will bog down significantly as Silverlight struggles to repaint the overgrown visual tree.

DonFreeman

Dan - Thanks

Actually, I wanted the maptip to appear with a mouseover because I already have a full identify with a mouseclick. So, are you suggesting that there be a FeatureLayer on top of the DynamicMapServiceLayer? Or just that the Url be changed to refer to FeatureLayer at the end? This, it seems, creates an invalid Url error, which is probably because the service is a map service and not a feature service? Which begs a new question. Should I, as a matter of course, create FeatureServices rather than MapServices? (I can make this all work with a FeatureService.)

I have also tried using the simpler maptip shown at http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#MapTipWidget but also without success.

The codebehind you suggest doesn't like the reference to "_mapServiceLayer.Url". Seems like that is undefined. Also, you are using "identify" which is another function in my project so I don't think I can use it here? So I'm still pretty puzzled. 😞

DanielWalton

Your main problem is that you've set up a maptip on a Dynamic map service layer. Maptips only work for layers that inherit from GraphicsLayer. My guess is that you want to pop up a maptip on a point where the user clicks, but don't want the expensive and sluggish FeatureLayer. No problem, just set up a FeatureLayer to buddy up with the DynamicMapServiceLayer (replace "/MapServer" with "FeatureServer/n" where n is the sublayer you want), and set the Mode=QueryMode.OnDemand and use the Where attribute to select one feature at a time. Your maptip XAML will belong in this new layer (since FeatureLayer inherits from GraphicsLayer). You can set the Where attribute after running an identify task on the MapServiceLayer. Some dummy code to illustrate:

       void Map_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            var it = new IdentifyTask(_mapServiceLayer.Url);
            it.ExecuteCompleted += it_ExecuteCompleted;
            var ip = new IdentifyParameters
            {
                LayerOption = LayerOption.all,
                Height = (int)Map.RenderSize.Height,
                Width = (int)Map.RenderSize.Width,
                DPI = (int)Map.Resolution,
                Tolerance = 1,
                Geometry = Map.ScreenToMap(e.GetPosition(Map)),
                MapExtent = Map.Extent,
                SpatialReference = Map.SpatialReference
            };
            it.ExecuteAsync(ip, null);
            IsBusy = true;
        }

        void it_ExecuteCompleted(object sender, IdentifyEventArgs e)
        {
            if (e.IdentifyResults.Count < 1)
            {
                IsBusy = false;
                ErrorMsg("No feature was found at that location");
                return; 
            }

            foreach (var res in e.IdentifyResults)
            {
                if (res.Feature == null || !res.Feature.Attributes.ContainsKey("OBJECTID"))
                    continue;
                var objectid = (string) res.Feature.Attributes["OBJECTID"];
                _featureLayer.Where = "OBJECTID = " + objectid;
                _featureLayer.Update();
                return;
            }
        }

DonFreeman

OK, here is my symbol.

<esri2:SimpleMarkerSymbol x:Key="DefaultMarkerSymbol" Color="Aqua" Style="Circle" />

and here is my map and layer with the bindings commented out.

<esri:ArcGISDynamicMapServiceLayer ID="ConstructionProjects" 
      Url="http://gismaps.pagnet.org/ArcGIS/rest/services/Interactive_TIP_2011/MapServer"
      VisibleLayers="1,2" >
      </esri:ArcGISDynamicMapServiceLayer>
      <esri:GraphicsLayer ID="MapTipGraphicsLayer">
       <esri:GraphicsLayer.MapTip>
        <Border esri:GraphicsLayer.MapTipHideDelay="00:00:01.5" CornerRadius="10" BorderBrush="#FF222957" BorderThickness="3" Margin="0,0,15,15">
         <Border.Background>
          <LinearGradientBrush EndPoint="1.038,1.136" StartPoint="0.015,0.188">
           <GradientStop Color="#FFD1DFF2"/>
           <GradientStop Color="#FF092959" Offset="0.946"/>
          </LinearGradientBrush>
         </Border.Background>
         <Border.Effect>
          <DropShadowEffect ShadowDepth="10" BlurRadius="14" Direction="300" />
         </Border.Effect>
         <StackPanel Orientation="Vertical" Margin="20,15,20,15">
          <StackPanel Orientation="Horizontal" Margin="0,0,0,6">
           <TextBlock Text="TIP ID: " FontWeight="Bold" Foreground="#FF0F274E" FontSize="12" />
           <!--<TextBlock Text="{Binding [TIP_ID]}" Foreground="#FFFFFFFF" FontSize="12" FontStyle="Italic" FontFamily="Portable User Interface" />-->
          </StackPanel>
          <StackPanel Orientation="Horizontal">
           <TextBlock Text="Name: " FontWeight="Bold" Foreground="#FF0F274E" FontSize="12" />
           <!--<TextBlock Text="{Binding [ST_NAME]}" Foreground="#FFFFFFFF" FontSize="12" FontStyle="Italic" FontFamily="Portable User Interface" />-->
          </StackPanel>
         </StackPanel>
        </Border>
       </esri:GraphicsLayer.MapTip> 
      </esri:GraphicsLayer>

Here is the code behind.

#region MapTip

  void MyMap_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
   {
   if (e.PropertyName == "SpatialReference")
    {
    MapTipGraphicsLayerLoad();
    MyMap.PropertyChanged -= MyMap_PropertyChanged;
    }
   }

  void MapTipGraphicsLayerLoad()
   {
   ESRI.ArcGIS.Client.Tasks.Query query = new ESRI.ArcGIS.Client.Tasks.Query()
   {
    Geometry = new ESRI.ArcGIS.Client.Geometry.Envelope(-180, 0, 0, 90),
    OutSpatialReference = MyMap.SpatialReference
   };
   query.OutFields.Add("*");

   QueryTask queryTask = new QueryTask("http://gismaps.pagnet.org/ArcGIS/rest/services/Interactive_TIP_2011/MapServer/1");
   queryTask.ExecuteCompleted += MapTipGraphicsLayerQueryTask_ExecuteCompleted;
     
   queryTask.ExecuteAsync(query);
   }

  void MapTipGraphicsLayerQueryTask_Failed(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs queryArgs)
  {
  MessageBox.Show("Failed") ;
  }

  void MapTipGraphicsLayerQueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs queryArgs)
   {
   
   if (queryArgs.FeatureSet == null)
    return;

   FeatureSet resultFeatureSet = queryArgs.FeatureSet;
   ESRI.ArcGIS.Client.GraphicsLayer graphicsLayer =
   MyMap.Layers["MapTipGraphicsLayer"] as ESRI.ArcGIS.Client.GraphicsLayer;

   if (resultFeatureSet != null && resultFeatureSet.Features.Count > 0)
    {
    foreach (ESRI.ArcGIS.Client.Graphic graphicFeature in resultFeatureSet.Features)
     {
     graphicFeature.Symbol = LayoutRoot.Resources["DefaultMarkerSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol;
     graphicsLayer.Graphics.Add(graphicFeature);
     }
    }
   }
#endregion

I know the attempt to catch the failed query is wrong. I couldn't figure out how to "subscribe" to the query failed or mouse enter events. I suspect the problem may be the geometry envelope since I don't know how or what values belong in there. I am not able to get any of the code to fire for the query, nothing pops up etc. Hopefully this will help someone spot my problem. 🙂

JenniferNery

Try to see if the Query ExecuteCompleted event is raised, subscribe to Failed event too if that gets raised instead. If the graphic symbol has IsHitTestVisible=false, none of the mouse events will be raised. Like Dan mentioned, try very simple symbol just to see that the features are present and that they accept mouse events. Then maybe display hard-coded text for now and fix the Binding later just to see if a maptip can be displayed. You can also subscribe to the layer's MouseEnter to check that it is hit when you enter the graphic.

DanielWalton

Any of a number of things could cause the maptip to not show up. As a test, comment out all the bound controls from your maptip template. You should at least see a small border show up when you hover. Then you can start adding controls back in to see what the funky binding expression is that's causing problems.

Also, in SL 4, there seems to be some discrepancies on how the binding to attributes can be referenced (Inline maptip template: use {Binding [attributename]}, Static resource template, use {Binding Attributes[attributename]}).

DonFreeman

Map PropertyChanged event is fired whenever a property of the map changes. In that specific sample, we are only concerned if the property that got changed is its SpatialReference. Dan is correct, when the first layer is added to your map, it should trigger SpatialReference property to change and since we unsubscribe to it after this, it would never be hit again. This is not the event that opens the maptip though.

GraphicsLayer MapTip opens when mouse enters a graphic. You can listen to GraphicsLayer MouseEnter event, if you want but opening and closing the MapTip is handled by the API.

When you say Map tip does not work.. what do you mean by that exactly? 😛 Map tip does not open or opens without content? Since you modified the services, you must have also updated the Binding statements since the attribute keys here are specific to the services in the sample. Also check that your graphics geometry and a symbol that is appropriate for this geometry type. Check also that if you used a symbol template, none of the elements here have IsHitTestVisible to false.

Thanks Jenn. When I say map tip doesn't work, I mean apsolutely nothing happens when I mouseover the point feature. No code fires, no visible indication that anything happened. As I looked at the code it seemed that something should fire the query task so I was trying to trace it back and it seemed like maybe the MapPropertyChanged was it, but now I see that is not how it works.

That said, there are several examples of maptips on the samples site and I was able to get the one under FeatureLayers to work. So my problem is solved for the moment. Is there anything about the graphics maptip that would make it not work with a FeatureLayer? (Just a question from someone new to the game.)
Thanks

JenniferNery

Map PropertyChanged event is fired whenever a property of the map changes. In that specific sample, we are only concerned if the property that got changed is its SpatialReference. Dan is correct, when the first layer is added to your map, it should trigger SpatialReference property to change and since we unsubscribe to it after this, it would never be hit again. This is not the event that opens the maptip though.

GraphicsLayer MapTip opens when mouse enters a graphic. You can listen to GraphicsLayer MouseEnter event, if you want but opening and closing the MapTip is handled by the API.

When you say Map tip does not work.. what do you mean by that exactly? 😛 Map tip does not open or opens without content? Since you modified the services, you must have also updated the Binding statements since the attribute keys here are specific to the services in the sample. Also check that your graphics geometry and a symbol that is appropriate for this geometry type. Check also that if you used a symbol template, none of the elements here have IsHitTestVisible to false.

DanielWalton

What is supposed to trigger the maptip?

In that sample, layer's maptip is defined in XAML and adds a behind-the-scenes event handler for GraphicsLayer.MouseEnter at startup. If your problem is that the maptips aren't showing, there might be a problem with the template for the Maptip. Silverlight doesn't always do the best job of notifying you of problems with templates.

DonFreeman

That event is triggered when the first layer is initialized, which sets the map's spatial reference.

Dan -
Yes, that would seem to agree with what I am seeing. However, looking at the esri sample code it looks like it should trigger again when the mouse hovers over a map feature. Or am I missing something? What is supposed to trigger the maptip?
Thanks

DanielWalton

That event is triggered when the first layer is initialized, which sets the map's spatial reference.

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