MvvmCross MvxListView ItemClick Enabled Based on property - xamarin

Question

So I have a MvxListView
<Mvx.MvxListView
android:id="#+id/receptionsListView"
android:divider="#drawable/divider"
android:scrollbars="vertical"
android:choiceMode="singleChoice"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="left|start"
local:MvxItemTemplate="#layout/item_supplier"
local:MvxBind="ItemsSource ReceptionSuppliersList; ItemClick SelectReceptionCommand;" />
I want to enabled/disabled some Items based on a value from model in the list. Something like
local:MvxBind="ItemsSource ReceptionSuppliersList; ItemClick SelectReceptionCommand; Enabled ReceptionSuppliersList.IsValid" />
From what I've tested this just disabled all my list items because there is no such property ReceptionSuppliersList.IsValid ( it's ReceptionSuppliersList[i].IsValid ). How can I achive this.
I also tried to add the Enabled Property on item_supplier like this
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="0dp"
style="#style/ExtendProTheme.ReceptionItem"
local:MvxBind="Enabled IsValid" >
But it still doesn't work.
Any ideas how can i disable some of the item from my list based on a property?
PS :
My items look like this
public string Username { get; set; }
public string DeviceId { get; set; }
public bool IsValid { get; set; }

Answer 1

You could create a custom adapter to handle the enabling/disabling of list items. You would just need to cast the Adapters ItemsSource to your ViewModels
ReceptionSuppliersList type in the IsEnabled override.
public class CustomAdapter : MvxAdapter
{
public CustomAdapter(Context context)
: base(context)
{
}
public CustomAdapter(Context context, IMvxAndroidBindingContext bindingContext)
: base(context, bindingContext)
{
}
protected CustomAdapter(IntPtr javaReference, JniHandleOwnership transfer) :
base(javaReference, transfer)
{
}
public override bool IsEnabled(int position)
{
var items = ItemsSource as List<TestModel>;
return items[position].IsValid;
}
}
Assign adapter to your MvxListView:
var receptionsListView = FindViewById<MvxListView>(Resource.Id.receptionsListView);
receptionsListView.Adapter = new CustomAdapter(this, BindingContext as IMvxAndroidBindingContext);

Answer 2

That's not a real problem-solve, but it should work for your case:
Add gray overlay on the item to make it look like it's not enabled.
Check whether item is enabled on the method handler for SelectReceptionCommand.
private void OnSelectReceptionCommandExecuted(Reception item)
{
if (!reception.IsEnabled)
{
return;
}
// your code here
}