Chart ZoomStart

Question

Hi,I'm trying to use the ZoomStart, but I've met some problems.On UWP, the event is triggered only the first time I zoom.On Android, it gives me this error : System.Reflection.TargetException: Non-static method requires a target.Or the chart just doesn't zoom when I set the ZoomStart.When it will be fixed ?Thanks

Divya Venkatesan · Answer

Hi Torrent, 
 
Query 1: On UWP, the event is triggered only the first time I zoom. 
We have made ZoomStart to work properly by hooking ManipulationCompleted event of chart in Custom Renderer as shown in the below code snippets.  
 
Code snippet [C#]: 




    public class CustomRenderer :  SfChartRenderer 
    { 
        SfChart formsChart; 
        protected override void OnElementChanged(ElementChangedEventArgs<SfChart> e) 
        { 
            base.OnElementChanged(e); 
 
            if (Control != null) 
            { 
                formsChart = e.NewElement as SfChart; 
                Control.ManipulationCompleted += Control_ManipulationCompleted; 
            } 
        } 
 
        private void Control_ManipulationCompleted(object sender, Windows.UI.Xaml.Input.ManipulationCompletedRoutedEventArgs e) 
        { 
            typeof(ChartAxis).GetTypeInfo().GetDeclaredProperty("CanTriggerZoomStart").SetValue(formsChart.PrimaryAxis, true); 
            typeof(ChartAxis).GetTypeInfo().GetDeclaredProperty("CanTriggerZoomStart").SetValue(formsChart.SecondaryAxis, true); 
        } 
    } 
 
Query 2: On Android, it gives me this error : System.Reflection.TargetException: Non-static method requires a target. 
We have prepared a sample by hooking ZoomStart event. The sample works fine and we have attached the sample for your reference. Could you please check with the sample in below location? 
 
Sample: http://www.syncfusion.com/downloads/support/forum/137313/ze/ZoomingSample-1800145446  
 
If still you face the problem, please revert us by modifying the sample based on your application along with replication procedure. This would be helpful for us to serve you. 
 
Regards, 
Divya Venkatesan