[W8.1]How detect zoom change on Map control in Windows 8.1

Question

Hi,
I'm developing a Windows Universal App that uses maps, on Windows Phone I have Maps:MapControl that have the ZoomLevelChanged event.
But on Windows 8.1 I must use the Maps:Map control that doesn't own any event to control the zoom change.
I need a way to detect when a user zoom a Map on Windows 8.1.
Anyone know how to detect a zoom change?

Thanks in advance for your help,
Stefano. 

Answer 1

Hi Stefano,

Based on MSDN, the MapControl class is only supported on Windows Phone 8.1. It is not supported on Windows 8.1:

Minimum supported client

               None supported [Windows Store apps only]

So I’m confused about your description below:

>>I must use the Maps:Map control that doesn't own any event to control the zoom change.

We don't have an official MapControl on Windows Store, please show us what control you used here.

Actually if you want to use maps in Windows Store app, you can use Bing maps, here is how you can do it: Add Bing Maps to a Windows Store app

And to know how zoom changed, you can check the Map class ViewChanged event, then get the ZoomLevel property.

Best regards,

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Answer 2

Yes I use Bing Maps, 
this is the solution that I've found:

//I've created create custom events ZoomChangedEventHandler  and CenterChangedEventHandler  

public event ZoomChangedEventHandler ZoomChanged;
public event CenterChangedEventHandler CenterChanged;

private Double oldZoomLevel; 
private Location oldCenter; 

private void Initialize() 
{            
  this.oldZoomLevel = MainMap.ZoomLevel;
  this.oldCenter = MainMap.Center;  
  this.ZoomChanged += MainPage_ZoomChanged;  
  this.CenterChanged += MainPage_CenterChanged;       
} 

private void MainMap_ViewChangeEnded(Object sender, ViewChangeEndedEventArgs e)
{          
  if (this.oldZoomLevel != this.MainMap.ZoomLevel)        
  {               
     ZoomChangedEventHandler zoomChanged = this.ZoomChanged;  
     if (zoomChanged != null)               
       {
         zoomChanged(MainMap, new EventArgs());         
       } 
       this.oldZoomLevel = this.MainMap.ZoomLevel;    
   }
   if (this.oldCenter != this.MainMap.Center)       
   {
     CenterChangedEventHandler centerChanged = this.CenterChanged; 
     if (centerChanged != null)            
     {
       centerChanged(MainMap, new EventArgs());  
     }
     this.oldCenter = this.MainMap.Center;  
   }
}

Answer 3

@Stefano

Thanks for sharing. :)

Best regards,

Barry

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Answer 4

You can use the new Maps API in Windows Phone 8 to develop map-based apps and to incorporate location and search features. This topic introduces the new map control, map modes, and map views.

just go to link:

https://msdn.microsoft.com/en-us/library/windows/apps/jj207045(v=vs.105).aspx 

 

And for more topics, visit the Microsoft Virtual Academy 

http://www.microsoftvirtualacademy.com/