Billing/Billing.Shared/UI/CustomControl.cs

using Billing.Themes;
using System;
using Xamarin.Forms;

namespace Billing.UI;

public class TintImage : Image
{
    public static readonly BindableProperty PrimaryColorProperty = BindableProperty.Create(nameof(PrimaryColor), typeof(Color?), typeof(TintImage));

    public Color? PrimaryColor
    {
        get => (Color?)GetValue(PrimaryColorProperty);
        set => SetValue(PrimaryColorProperty, value);
    }
}

public class LongPressButton : Button
{
    public event EventHandler LongPressed;

    public LongPressButton()
    {
        Padding = 0;
        BackgroundColor = Color.Transparent;
    }

    public void TriggerLongPress()
    {
        LongPressed?.Invoke(this, EventArgs.Empty);
    }
}

public class OptionEntry : Entry { }

public abstract class OptionCell : ViewCell
{
    public static readonly BindableProperty TitleProperty = BindableProperty.Create(nameof(Title), typeof(string), typeof(OptionCell));
    public static readonly BindableProperty BackgroundColorProperty = BindableProperty.Create(nameof(BackgroundColor), typeof(Color), typeof(OptionCell));

    public string Title
    {
        get => (string)GetValue(TitleProperty);
        set => SetValue(TitleProperty, value);
    }
    public Color BackgroundColor
    {
        get => (Color)GetValue(BackgroundColorProperty);
        set => SetValue(BackgroundColorProperty, value);
    }

    protected abstract View Content { get; }

    public OptionCell()
    {
        View = new Grid
        {
            BindingContext = this,
            Padding = new Thickness(20, 0),
            ColumnDefinitions =
            {
                new ColumnDefinition { Width = new GridLength(.3, GridUnitType.Star) },
                new ColumnDefinition { Width = new GridLength(.7, GridUnitType.Star) }
            },
            Children =
            {
                new Label
                {
                    LineBreakMode = LineBreakMode.TailTruncation,
                    VerticalOptions = LayoutOptions.Center
                }
                .Binding(Label.TextProperty, nameof(Title))
                .DynamicResource(Label.TextColorProperty, BaseTheme.TextColor),

                Content.GridColumn(1)
            }
        }
        .DynamicResource(VisualElement.BackgroundColorProperty, BaseTheme.OptionTintColor);
    }
}

public class OptionTextCell : OptionCell
{
    public static readonly BindableProperty DetailProperty = BindableProperty.Create(nameof(Detail), typeof(string), typeof(OptionTextCell));

    public string Detail
    {
        get => (string)GetValue(DetailProperty);
        set => SetValue(DetailProperty, value);
    }

    protected override View Content => new Label
    {
        HorizontalOptions = LayoutOptions.End,
        VerticalOptions = LayoutOptions.Center
    }
    .Binding(Label.TextProperty, nameof(Detail))
    .DynamicResource(Label.TextColorProperty, BaseTheme.SecondaryTextColor);
}

public class OptionSwitchCell : OptionCell
{
    public static readonly BindableProperty IsToggledProperty = BindableProperty.Create(nameof(IsToggled), typeof(bool), typeof(OptionSwitchCell));

    public bool IsToggled
    {
        get => (bool)GetValue(IsToggledProperty);
        set => SetValue(IsToggledProperty, value);
    }

    protected override View Content => new Switch
    {
        HorizontalOptions = LayoutOptions.End,
        VerticalOptions = LayoutOptions.Center
    }
    .Binding(Switch.IsToggledProperty, nameof(IsToggled), BindingMode.TwoWay);
}

public class OptionEntryCell : OptionCell
{
    public static readonly BindableProperty TextProperty = BindableProperty.Create(nameof(Text), typeof(string), typeof(OptionEntryCell));
    public static readonly BindableProperty KeyboardProperty = BindableProperty.Create(nameof(Keyboard), typeof(Keyboard), typeof(OptionEntryCell));
    public static readonly BindableProperty PlaceholderProperty = BindableProperty.Create(nameof(Placeholder), typeof(string), typeof(OptionEntryCell));

    public string Text
    {
        get => (string)GetValue(TextProperty);
        set => SetValue(TextProperty, value);
    }
    public Keyboard Keyboard
    {
        get => (Keyboard)GetValue(KeyboardProperty);
        set => SetValue(KeyboardProperty, value);
    }
    public string Placeholder
    {
        get => (string)GetValue(PlaceholderProperty);
        set => SetValue(PlaceholderProperty, value);
    }

    protected override View Content => new OptionEntry
    {
        HorizontalOptions = LayoutOptions.Fill,
        HorizontalTextAlignment = TextAlignment.End,
        VerticalOptions = LayoutOptions.Center,
        ReturnType = ReturnType.Next
    }
    .Binding(Entry.TextProperty, nameof(Text), BindingMode.TwoWay)
    .Binding(InputView.KeyboardProperty, nameof(Keyboard))
    .Binding(Entry.PlaceholderProperty, nameof(Placeholder))
    .DynamicResource(Entry.TextColorProperty, BaseTheme.TextColor)
    .DynamicResource(Entry.PlaceholderColorProperty, BaseTheme.SecondaryTextColor)
    .DynamicResource(VisualElement.BackgroundColorProperty, BaseTheme.OptionTintColor);
}