CODEWITHSUNDEEP
c#xamlwindows-10uwpuwp-maps
Alex
Alex

Reputation: 3889

UWP: Map control ZoomFinished event

I need to execute some code when the user finishes to zoom in/out the map. Its ZoomLevelChanged event is raised as the user zooms in or out, so it is not a solution for me (mainly because the code i want to execute is a pretty expensive operation). Any ideas?

Upvotes: 0

Views: 399

Answers (2)

S. Matthews
S. Matthews

Reputation: 355

I believe a better solution is to listen to the LoadingStatusChanged event, then take action when you get back MapLoadingStatus.Loaded.

public void LoadingStatusChangedEventHandler(MapControl sender, Object o)
{
    if (sender.LoadingStatus == MapLoadingStatus.Loaded)
    {
        // The map has stopped moving and finished rendering
        // If necessary, check that zoom level is different
        DoExpensiveOperation();
    }
}

I know the documentation for that event isn't great, but there's a little more information at this code sample, and you may be able to find even more on the git repo.

Good luck!!

Upvotes: 0

user6760141
user6760141

Reputation:

If the performance is the main issue here, you can "rerender" your map elements only when the zoom level changes from one integer to another (1->2, 2->3 and so on) (skiping the part after coma). As far as I know the maximum value for ZoomLevel is 20 (for 2D) mode. So I think it must be smooth enough for the user not to notice.

Some code:

public int ZoomLevel {get; set;} = initialZoomLevel;

private void OnZoomLevelChanged(object sender, EventArgs args)
{
    if((int)Map.ZoomLevel!=ZoomLevel)
    {
        //Rerender stuff
    }
}

Upvotes: 2

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