Владимир Коротенко

1. ручку для постановки задачи в очередь (rabbitmq, kafka, db)
   
2. ручку для проверки статуса задачи
   
3. ручку для получения результатов, если задача в статусе "выполнено"
   

public class Item : ViewModelBase
{
    private int value;
    private bool isSelected;
    public int Value
    {
        get => value;
        private set => SetProperty(ref this.value, value);
    }
    public bool IsSelected
    {
        get => isSelected;
        set => SetProperty(ref isSelected, value);
    }

    public Item(int value, bool isSelected = false)
    {
        Value = value;
        IsSelected = isSelected;
    }

    public void IncrementSelected()
    {
        if (IsSelected)
        {
            Value++;
        }
    }
}

public class MyContext
{
    public int BaseValue { get; } = 14;
    public Item Item1 { get; }
    public Item Item2 { get; }
    public Item Item3 { get; }

    public MyContext()
    {
        Item1 = new Item(BaseValue, true);
        Item2 = new Item(BaseValue);
        Item3 = new Item(BaseValue);

        IncrementSelectedCommand =
            new DelegateCommand<object>(_ => IncrementSelected());
        ClickCommand = new DelegateCommand<Item>(
            o => SelectOrDeselect(o),
            o => o is Item);
    }

    public ICommand IncrementSelectedCommand { get; }
    public ICommand ClickCommand { get; }

    public void IncrementSelected()
    {
        Item1.IncrementSelected();
        Item2.IncrementSelected();
        Item3.IncrementSelected();
    }

    public void SelectOrDeselect(Item item)
    {
        item.IsSelected = !item.IsSelected;
    }
}

<Style x:Key="selectableBtn" TargetType="Button">
    <Style.Triggers>
        <DataTrigger
            Binding="{Binding IsSelected}"
            TargetType="Button"
            Value="True">
            <Setter Property="BackgroundColor" Value="Red" />
        </DataTrigger>
    </Style.Triggers>
</Style>

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="*" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Label
        Grid.Column="1"
        FontSize="Large"
        HorizontalTextAlignment="Center"
        Text="I"
        VerticalTextAlignment="Center" />
    <Label
        Grid.Column="2"
        FontSize="Large"
        HorizontalTextAlignment="Center"
        Text="II"
        VerticalTextAlignment="Center" />
    <Label
        Grid.Column="3"
        FontSize="Large"
        HorizontalTextAlignment="Center"
        Text="III"
        VerticalTextAlignment="Center" />
    <Label
        Grid.Row="1"
        FontSize="Medium"
        HorizontalTextAlignment="Center"
        Text="{Binding BaseValue}" />
    <Button
        Grid.Row="1"
        Grid.Column="1"
        BindingContext="{Binding Item1}"
        Command="{Binding BindingContext.ClickCommand, Source={RelativeSource Mode=FindAncestor, AncestorType={x:Type d:ContentPage}}}"
        CommandParameter="{Binding .}"
        Style="{StaticResource selectableBtn}"
        Text="{Binding Value}" />
    <Button
        Grid.Row="1"
        Grid.Column="2"
        BindingContext="{Binding Item2}"
        Command="{Binding BindingContext.ClickCommand, Source={RelativeSource Mode=FindAncestor, AncestorType={x:Type d:ContentPage}}}"
        CommandParameter="{Binding .}"
        Style="{StaticResource selectableBtn}"
        Text="{Binding Value}" />
    <Button
        Grid.Row="1"
        Grid.Column="3"
        BindingContext="{Binding Item3}"
        Command="{Binding BindingContext.ClickCommand, Source={RelativeSource Mode=FindAncestor, AncestorType={x:Type d:ContentPage}}}"
        CommandParameter="{Binding .}"
        Style="{StaticResource selectableBtn}"
        Text="{Binding Value}" />
    <Button
        Grid.Row="2"
        Grid.Column="3"
        Command="{Binding IncrementSelectedCommand}"
        Text="Add" />
</Grid>