xamarineventtocommand

Sending selected object from listview on entry unfocused through event to command behavior


I have a listview, within the list view I have an entry box. I want to run some code after the entry box becomes unfocused which I have got working with the xct event to command behavior, but I would like the command to receive the object from the listview that the entry is inside.

(sudo xaml)

<ListView Name = ReportGrid>
    <DataTemplate>
        <ViewCell>
            <StackLayout>
                <Entry Text="0.00" VerticalOptions="Center" FontSize="16" BackgroundColor="White" Margin="10, 0, 0, 0">
                    <Entry.Behaviors
                        <behaviors:EventToCommandBehavior EventName="Unfocused" Command="{Binding Source={Reference CountLocationTabView}, Path=BindingContext.QtyEntryUnfocused}" 
                                                          CommandParameter="{Binding Source={Reference ReportGrid}, Path=SelectedItem}" />
                    </Entry.Behaviors>
                </Entry>
            <StackLayout/>
        <ViewCell/>
    <DataTemplate/>
<ListView/>

I have seen examples of this where events from the listview are turned into commands but what about the elements within? thanks in advance.


Solution

  • Based on your code,I created a simple demo, and it works properly.

    You can refer to the following code:

            <ListView ItemsSource="{Binding items}" HasUnevenRows="True" HeightRequest="240" x:Name="Listview">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Frame Padding="0" >
                                <Grid Padding="0">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="0.5*"></ColumnDefinition>
                                        <ColumnDefinition Width="3*"></ColumnDefinition>
                                        <ColumnDefinition Width="3*"></ColumnDefinition>
                                    </Grid.ColumnDefinitions>
                                    <Label x:Name="DistNumber" Text="{Binding DistNumber}" FontSize="18"   Grid.Column="1" HorizontalTextAlignment="Start" VerticalOptions="Center"/>
                                    <Entry  x:Name="CountEntry" Placeholder="Choose Quantity" 
                                            Text="{Binding Count}" 
                                            
                                            Grid.Column="2" HorizontalTextAlignment="Center" >
                                        <Entry.Behaviors>
                                            <behaviors:EventToCommandBehavior 
                                                EventName="Unfocused" 
                                                Command="{Binding Path=BindingContext.EntryUnfocused, Source={x:Reference Listview}}" CommandParameter="{Binding .}" />
    
                                        </Entry.Behaviors>
                                    </Entry>
                                   
                                </Grid>
                            </Frame>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
    

    The ViewModel is:

     public class MyViewModel
    {
        public ObservableCollection<SomeItem> items { get; set; }
    
        public ICommand EntryUnfocused { get; protected set; }
    
    
        public MyViewModel() {
    
            items = new ObservableCollection<SomeItem>();
    
            items.Add(new SomeItem { Name = "item1", DistNumber = "1", Count = 1,Quantity = 1 });
            items.Add(new SomeItem { Name = "item2", DistNumber = "2", Count = 2, Quantity = 2 });
            items.Add(new SomeItem { Name = "item3", DistNumber = "3", Count = 3, Quantity = 3 });
            items.Add(new SomeItem { Name = "item4", DistNumber = "4", Count = 4, Quantity = 4 });
            items.Add(new SomeItem { Name = "item5", DistNumber = "5", Count = 5, Quantity = 5 });
            items.Add(new SomeItem { Name = "item6", DistNumber = "6", Count = 6, Quantity = 6 });
    
    
            EntryUnfocused = new Command(CompletedCommandExecutedAsync);
        }
    
        private void CompletedCommandExecutedAsync(Object obj)
        {
            SomeItem item = (SomeItem)obj;
    
            System.Diagnostics.Debug.WriteLine("<----- item Name = " + item.Name + "<-----> item Count = " + item.Count);
        }
    }