topic Re: How to wait for MapView to Load? in ArcGIS Pro SDK Questions

How to wait for MapView to Load?

MKa — Tue, 24 Oct 2017 20:05:02 GMT

In my configuration project, my startup page allows a user to pick a "Location", using this location I create a new project for them. I then want to get the MapView and load up some feature layers for that location and zoom to that location. But it seems i have to wait for the Map to load before i can do what I want.

So I call this Command from my xaml BlankProjectCommand

public ICommand BlankProjectCommand
{
      get
      {
         return new RelayCommand((args) => BlankSelectionViewModelHelper.NewBlankProject(_Location), () => true); ;
      }
}

Then it returns this function NewBlankProject, but the following function wont work fully because i cant reference the MapView.Active.Map as I want to load some feature layers for the Location and zoom to that location. Is there anyway I can wait for the map to load after var newProject = await Project.CreateAsync(cps);

internal static async void NewBlankProject(string inLocation)
{
     string defaultName = inLocation;
     string defaultFolder = DefaultFolder();
     string templatePath = GetDefaultMapTemplate(); //Map

     if (!string.IsNullOrEmpty(defaultFolder) && !string.IsNullOrEmpty(templatePath))
     {
          var cps = new CreateProjectSettings()
          {

               Name = defaultName,
               LocationPath = DefaultFolder(),
               TemplatePath = GetDefaultMapTemplate()
          };

          var newProject = await Project.CreateAsync(cps);

          if (MapView.Active != null && MapView.Active.Map != null)
          {
               MapSettings newMapSettings = new MapSettings();
               newMapSettings.PlantCode = inPlantCode;
               newMapSettings.HarvestYear = inHarvestYear;
               newMapSettings.HarvestTrimester = inHarvestTrimester;
               newMapSettings.MaterialGroup = inMaterialGroup;
               newMapSettings.Environment = Settings.CurrentEnvironment;

List<UserPlantData> UserPlantDataList = new List<UserPlantData>();
UserPlantDataList = await WebServiceUtility.GetUserPlantDataAsync();

               if (!newMapSettings.Equals(Settings.CurrentMapSettings))
               {
                    await FeatureServiceManagement.LoadFeatureServiceAsync(newMapSettings);
                    await Navigation.ZoomToPlantExtentAsync();
               }

}
}

Re: How to wait for MapView to Load?

UmaHarano — Sun, 12 Dec 2021 10:02:33 GMT

When you open a project with a Map View, you can wait for the MapView to initialize by subscribing to the "MapViewInitialized" event (topic12855.html). Important thing to note is that when you open a new view in your project, this event will be triggered again.

If you want to subscribe to the MapViewInitialized event as a one shot per project, you will have to:

Unsubscribe after the MapView has initialized the first time when the project opens.
Then subscribe to the ProjectOpenedEvent and then check if the MapView is again initialized. (for subsequent Project open routines)

Here is a code snippet to subscribe and unsubscribe to the MapViewInitialized event.

private SubscriptionToken _eventToken = null;
 protected override bool Initialize()  //Module initialized
        {

            _eventToken = MapViewInitializedEvent.Subscribe(OnMapViewInitialized);
            return base.Initialize();
        }

        private void OnMapViewInitialized(MapViewEventArgs args)
        {

            MessageBox.Show("MapView has been initialized");
            if (_eventToken != null)
            {
                ArcGIS.Desktop.Mapping.Events.MapViewInitializedEvent.Unsubscribe(_eventToken);
                _eventToken = null;
            }
        }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Thanks

Uma

Re: How to wait for MapView to Load?

BarbaraSchneider2 — Fri, 10 Jan 2020 15:23:36 GMT

Hi Uma,

thanks for your input. Your code above works fine for me when I first show the message box ("MapView has been initialized") and then access the active map (MapView.Active.Map). When I remove the message box, however, the active mapview is null. How can I get around this?

Thanks,

Barbara

Re: How to wait for MapView to Load?

UmaHarano — Fri, 10 Jan 2020 17:06:10 GMT

Hi Barbara

The best way to ensure that the MapView initialization is complete and a MapView is available is to use the DrawCompleteEvent.

The arcgis-pro-sdk-community-samples repo has a few examples:

https://github.com/Esri/arcgis-pro-sdk-community-samples/search?q=DrawCompleteEvent&unscoped_q=DrawCompleteEvent

Thanks

Uma

Re: How to wait for MapView to Load?

BarbaraSchneider2 — Thu, 16 Jan 2020 08:57:52 GMT

Hi Uma,

this works, thank you!

Re: How to wait for MapView to Load?

RishabhRaj29 — Wed, 20 Dec 2023 13:19:36 GMT

Hi @UmaHarano , the link is broken. Can you please share the sample again? Thanks!

Re: How to wait for MapView to Load?

RadekMandovec — Thu, 07 Nov 2024 10:03:24 GMT

Hi Uma,

this works fine for MapView, but is there any way to do something similar for LayoutView? I tried different events, but none of them works for me.

Radek

Re: How to wait for MapView to Load?

GKmieliauskas — Thu, 07 Nov 2024 12:53:57 GMT

Hi,

Try to subscribe to ArcGIS.Desktop.Layouts.Events.LayoutViewEvent and check args.Hint == LayoutViewEventHint.DrawingComplete. LayoutViewEventHint Enumeration here.