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Sflistview -Set the Bindingcontext for command and command parameter in a listview item

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144873 May 27,2019 10:25 AM UTC May 28,2019 01:55 PM UTC Xamarin.Forms 1
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Tags: SfListView
Ramya
Asked On May 27, 2019 10:28 AM UTC

I am using sflistview to display list of items (uses samplelistviewmodel)  and having a datatemplate for my viewcell (uses sampleitemviewmodel)  .
Inside the view cell i have a grid , with a Tap gesture recoognizer .This recognizer would call a command from a samplelistviewmodel and pass the sampleitemviewmodel as a Commandparameter to that command .

  <xForms:SfListView
                    Grid.Row="2"
                    SelectionBackgroundColor="Transparent"
                    BackgroundColor="#F0F4F7"
                    ItemSize="270"
                    ItemsSource="{Binding ItemList}"
                   
                   >
                    <xForms:SfListView.ItemTemplate>
                        <DataTemplate>
                            <views: SampleViewCell />
                        DataTemplate>
                    xForms:SfListView.ItemTemplate>
                xForms:SfListView>

My code snippet is as follows,

<ViewCell
    x:Class=""
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:controls=""
    xmlns:xamlMarkupExtensions=""
    x:Name="SampleViewCell"
   >  
  <ViewCell.View >  

   
                       
                            Command="{Binding Source={x:Reference SampleViewCell}, Path=Parent.BindingContext.SampleCommand}"
                            CommandParameter="{Binding Source={x:Reference SampleViewCell}, Path=BindingContext}"
  
  ViewCell.View >


However the same works , when i try with listview it works , while with sflitview it doesnt.Please help

Subburaj Pandian Veluchamy [Syncfusion]
Replied On May 28, 2019 01:55 PM UTC

Hi Ramya, 
  
Thank you for contacting Syncfusion support. 
  
We would like to inform you that in SfListView, BindingContext of the ItemTemplate will be Model class for the Template items. So, when you define the Command for ViewCell, it is necessary to initialize the command in Model as following.  
  
  
MessageInfoModel.cs 
 
public class MessageInfo : INotifyPropertyChanged 
{ 
       public Command<object> SampleCommand { get; } 
       public MessageInfo() 
       { 
            SampleCommand = new Command<object>(OnGridTapped); 
       } 
  
        private void OnGridTapped(object obj) 
        { 
            var param = obj as MessageInfo; 
            App.Current.MainPage.DisplayAlert("Message","Tapped Item :"+param.Text,"Ok"); 
        } 
} 
  
IncomingTextTemplate.xaml 
  
<ViewCell > 
    <Grid ColumnSpacing="2" x:Name="Grid"> 
        <Grid.GestureRecognizers> 
            <TapGestureRecognizer Command="{Binding Source={x:ReferenceGrid}, Path=BindingContext.SampleCommand}" CommandParameter="{Binding Source={x:Reference Grid}, Path=BindingContext}"/> 
        </Grid.GestureRecognizers> 
</ViewCell > 
  
  
We have attached the model sample for your reference, 
  
 
Please let us know if you need any further assistance. 
 
Regards,
Subburaj Pandian V 


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