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POMapZoom Event not firing for ZoomBar controls
 

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    <p>I have a WP7.1 application with a bing map control on, and I have set the ZoomBarVisibility="Visible" which shows up the plus and minus buttons to control the map zoom. I have then added a MapZoom event, via code and via the xaml and neither event will fire when the zoom buttons are pressed. If I pinch and zoom the events will fire.</p> <p>I have tested this functionality on the phone and the emulator and I get the same results. I'm now thinking that the only way around my issue is to databind to the ZoomLevel property and then raise my own events when this changes.</p> <p>Has anyone else ran into this issue?</p> <p>Below is a copy of my noddy code:</p> <pre><code>&lt;phone:PhoneApplicationPage x:Class="MapTest.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:my="clr-namespace:Microsoft.Phone.Controls.Maps;assembly=Microsoft.Phone.Controls.Maps" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" shell:SystemTray.IsVisible="True"&gt; &lt;my:Map x:Name="map2" ZoomBarVisibility="Visible" ZoomLevel="{Binding ZoomLevel, Mode=TwoWay}" MapZoom="map2_MapZoom_1" /&gt; &lt;/phone:PhoneApplicationPage&gt; </code></pre> <p>This is the code behind</p> <pre><code>using System; using System.ComponentModel; using System.Windows; using Microsoft.Phone.Controls; using Microsoft.Phone.Controls.Maps; namespace MapTest { public partial class MainPage : PhoneApplicationPage, INotifyPropertyChanged { public MainPage() { InitializeComponent(); map2.MapZoom += (o, args) =&gt; MessageBox.Show("Fired from annoymous delegate"); this.DataContext = this; } private void map2_MapZoom_1(object sender, MapZoomEventArgs e) { MessageBox.Show("Fired from event"); } private int _zoomlevel=50; public int ZoomLevel { get { return _zoomlevel; } set { _zoomlevel = value; RaisePropertyChanged("ZoomLevel"); } } public event PropertyChangedEventHandler PropertyChanged; protected void RaisePropertyChanged(string propertyName) { if (Deployment.Current.Dispatcher.CheckAccess()) { _RaisePropertyChanged(propertyName); } else { Deployment.Current.Dispatcher.BeginInvoke(new Action&lt;string&gt;(_RaisePropertyChanged), propertyName); } } private void _RaisePropertyChanged(string propertyName) { PropertyChangedEventHandler propertyChanged = PropertyChanged; if ((propertyChanged != null)) { propertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } } } </code></pre> <p>*<strong><em>Proposed Solution</em>****</strong> Looks like from other comments that its a bug, so I'm going with my proposed solution, which might help someone else out.</p> <pre><code> private int _zoomlevel=50; private int _previousZoomLevel = 50; public int ZoomLevel { get { return _zoomlevel; } set { _previousZoomLevel = _zoomlevel; _zoomlevel = value; RaisePropertyChanged("ZoomLevel"); if (_previousZoomLevel !=_zoomlevel &amp;&amp; MapZoomed != null) MapZoomed(new MapZoomedEventArgs() { PreviousZoomLevel = _previousZoomLevel, ZoomLevel = _zoomlevel }); } } public class MapZoomedEventArgs { public int PreviousZoomLevel; public int ZoomLevel; } </code></pre> <p>The reason for checking the previousZoomLevel is because the property fires multiple times. I can then use this event to handle my MapZoom event rather than the backed in MS version - and as mentioned I can easily swap out the existing ZoomBar for something more exciting and it will still work.</p>
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