topic Re: How to create MapTips at runtime in ArcGIS API for Silverlight Questions

How to create MapTips at runtime

IgressT — Thu, 13 Jan 2011 13:59:12 GMT

I dynamically create Graphic layers and want to create and assign a new MapTip at runtime each time I create the layer.
The simple way of creating a new MapTip object and assigning its graphics layer property is not working (see the sample code).
Does any one how to do it?

private void GPTask_ExecuteCompleted(object sender, GPExecuteCompleteEventArgs e)
        {
            GraphicsLayer graphicslayer = new GraphicsLayer();
            graphicslayer.ID = "xxx";

            // Adding features to graphics layer
     

            // Rendering    
            graphicslayer.Renderer = cbr;

            // Refresh graphics layer
            graphicslayer.Refresh();

            this.Map.Layers.Add(graphicslayer);

            MapTip mp = new MapTip();
            mp.GraphicsLayer = graphicslayer;
            mp.TitleMember = "grid_code";
            mp.Title = "Pollution Levels";
            mp.Visibility = Visibility.Visible;

        }

Re: How to create MapTips at runtime

DanielWalton — Sat, 11 Dec 2021 10:33:35 GMT

It looks like you're confusing the two different MapTip classes. The ESRI.ArcGIS.Client.MapTip class would probably work better for what you're trying to do:

        private void GPTask_ExecuteCompleted(object sender, GPExecuteCompleteEventArgs e)
        {
            var graphicslayer = new GraphicsLayer()
            {
                ID = "xxx",
                Renderer = cbr,
                MapTip = new ContentControl()
                { ContentTemplate = (DataTemplate)Resources["gpTaskMapTipTemplate"] }
            };
            graphicslayer.MapTip.SetBinding(ContentControl.ContentProperty, new System.Windows.Data.Binding());
            Map.Layers.Add(graphicslayer);
        }

then on your usercontrol XAML page:

    <UserControl.Resources>
        <DataTemplate x:Key="gpTaskMapTipTemplate">
            <Border Background="White">
                <StackPanel>
                    <TextBlock Text="{Binding [grid_code]}" Foreground="White" />
                </StackPanel>
            </Border>
        </DataTemplate>
    </UserControl.Resources>

If you would rather use the ESRI.ArcGIS.Client.Toolkit.MapTip control, you have to declare it separately and add it to your usercontrol's visual tree, whether through XAML or code.

Re: How to create MapTips at runtime

IgressT — Sat, 11 Dec 2021 10:33:38 GMT

It looks like you're confusing the two different MapTip classes. The ESRI.ArcGIS.Client.MapTip class would probably work better for what you're trying to do:

        private void GPTask_ExecuteCompleted(object sender, GPExecuteCompleteEventArgs e)
        {
            var graphicslayer = new GraphicsLayer()
            {
                ID = "xxx",
                Renderer = cbr,
                MapTip = new ContentControl()
                { ContentTemplate = (DataTemplate)Resources["gpTaskMapTipTemplate"] }
            };
            graphicslayer.MapTip.SetBinding(ContentControl.ContentProperty, new System.Windows.Data.Binding());
            Map.Layers.Add(graphicslayer);
        }

then on your usercontrol XAML page:

    <UserControl.Resources>
        <DataTemplate x:Key="gpTaskMapTipTemplate">
            <Border Background="White">
                <StackPanel>
                    <TextBlock Text="{Binding [grid_code]}" Foreground="White" />
                </StackPanel>
            </Border>
        </DataTemplate>
    </UserControl.Resources>

If you would rather use the ESRI.ArcGIS.Client.Toolkit.MapTip control, you have to declare it separately and add it to your usercontrol's visual tree, whether through XAML or code.

Hi that works but the maptip I see when I hover over the graphic is "ESRI.ArcGIS.Client.Graphics.ObservableDictionary"
Any clue?
Thanks

Re: How to create MapTips at runtime

DanielWalton — Thu, 13 Jan 2011 16:28:30 GMT

So apparently the attribute "grid_code" in your service is of type ObservableCollection. Try replacing the textbox in the maptip with a DataGrid and bind the ItemsSource to [grid_code].

Re: How to create MapTips at runtime

IgressT — Thu, 13 Jan 2011 16:54:41 GMT

So apparently the attribute "grid_code" in your service is of type ObservableCollection. Try replacing the textbox in the maptip with a DataGrid and bind the ItemsSource to [grid_code].

Thanks. I tried it and it still shows the same thing when I hover over the graphic

Re: How to create MapTips at runtime

DanielWalton — Thu, 13 Jan 2011 19:02:24 GMT

Ignore my last post. You're seeing the default template, which means Silverlight can't locate your datatemplate. The only way my code would work is if you're creating the maptip within the usercontrol codebehind. Anywhere else and you will need to add the datatemplate XAML to the application resources, either in App.xaml or one of the merged dictionaries.

Re: How to create MapTips at runtime

IgressT — Fri, 14 Jan 2011 15:30:42 GMT

Ignore my last post. You're seeing the default template, which means Silverlight can't locate your datatemplate. The only way my code would work is if you're creating the maptip within the usercontrol codebehind. Anywhere else and you will need to add the datatemplate XAML to the application resources, either in App.xaml or one of the merged dictionaries.

I moved the datatemplate to merged dictionary and it worked. Thanks

Re: How to create MapTips at runtime

AgatinoLa_Rosa — Sat, 11 Dec 2021 10:33:41 GMT

I have also moved the datatemplate to merged dictionary but did not work. Could you please suggest where exactly to insert the following code? Did you set a tag for the <UserControl>? Thanks.

<UserControl.Resources>
        <DataTemplate x:Key="myLabel" >
            <Border Background="Beige" >
                <StackPanel>
                    <TextBlock Text="{Binding [NAME]}" FontSize="8" Foreground="White" />
                </StackPanel>
            </Border>
        </DataTemplate>
    </UserControl.Resources>

Re: How to create MapTips at runtime

DominiqueBroux — Fri, 15 Apr 2011 07:47:00 GMT

Could you please suggest where exactly to insert the following code?

If you insert it as a resource of your user control, you have to get by code as a resource of this same userControl:

MapTip = new ContentControl()
{ ContentTemplate = (DataTemplate)myUserControl.Resources["myLabel"] }

Re: How to create MapTips at runtime

AgatinoLa_Rosa — Fri, 15 Apr 2011 10:50:10 GMT

Thanks. It works.