I'm a WPF developer and recently I've started MAUI project. And It looks like you have to reinvent the wheel every time when you are going to write such a simple scenario as you mentioned :(. When you do it using WPF you even don't need to thought about that, it's too easy to implement, but when you use MAUI you should break your mind to do such minor things.
I also encountered the same issue and I didn't find a simple in-box solution. But I came up with the idea to create a control with some layout inside that has attached properties from BindableLayout
TemplatedContentPresenter.xaml.cs:
public partial class TemplatedContentPresenter : ContentView
{
public TemplatedContentPresenter()
{
InitializeComponent();
}
public static readonly BindableProperty DataTemplateSelectorProperty = BindableProperty.Create(nameof(DataTemplateSelector), typeof(DataTemplateSelector), typeof(TemplatedContentPresenter), null, propertyChanged: DataTemplateSelectorChanged);
public static readonly BindableProperty DataTemplateProperty = BindableProperty.Create(nameof(DataTemplate), typeof(DataTemplate), typeof(TemplatedContentPresenter), null, propertyChanged: DataTemplateChanged);
public static readonly BindableProperty DataProperty = BindableProperty.Create(nameof(Data), typeof(object), typeof(TemplatedContentPresenter), null, propertyChanged: DataChanged);
public DataTemplateSelector DataTemplateSelector
{
get =>(DataTemplateSelector)GetValue(DataTemplateSelectorProperty);
set => SetValue(DataTemplateSelectorProperty, value);
}
public DataTemplate DataTemplate
{
get => (DataTemplate)GetValue(DataTemplateProperty);
set => SetValue(DataTemplateProperty, value);
}
public object Data
{
get => GetValue(DataProperty);
set => SetValue(DataProperty, value);
}
private static void DataTemplateSelectorChanged(BindableObject bindable, object oldValue, object newValue)
{
if(bindable is TemplatedContentPresenter contentPresenter && newValue is DataTemplateSelector dataTemplateSelector)
{
BindableLayout.SetItemTemplateSelector(contentPresenter.HostGrid, dataTemplateSelector);
}
}
private static void DataTemplateChanged(BindableObject bindable, object oldValue, object newValue)
{
if (bindable is TemplatedContentPresenter contentPresenter && newValue is DataTemplate dataTemplate)
{
BindableLayout.SetItemTemplate(contentPresenter.HostGrid, dataTemplate);
}
}
private static void DataChanged(BindableObject bindable, object oldValue, object newValue)
{
if (bindable is TemplatedContentPresenter contentPresenter)
{
BindableLayout.SetItemsSource(contentPresenter.HostGrid, new object[] { newValue });
}
}
}
TemplatedContentPresenter.xaml:
<?xml version="1.0" encoding="utf-8" ?>
<ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.TemplatedContentPresenter">
<Grid x:Name="HostGrid" x:FieldModifier="private" />
</ContentView>
Usage:
<Frame WidthRequest="500" HeightRequest="500">
<controls:TemplatedContentPresenter
Data="{Binding}"
DataTemplateSelector="{StaticResource CardTemplateSelector}"/>
</Frame>
UPD:
While I was writing the answer I came up with another solution with a simple converter:
SingleObjectToArray.xaml
internal class SingleObjectToArray : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return new object[] { value };
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Usage:
<Frame>
<Frame.Resources>
<converters:SingleObjectToArray x:Key="SingleObjectToArrayConverter"/>
</Frame.Resources>
<Grid BindableLayout.ItemsSource="{Binding Converter={StaticResource SingleObjectToArrayConverter}}"
BindableLayout.ItemTemplateSelector="{StaticResource CardTemplateSelector}" />
</Frame>
