maui-linux/Handlers/DatePickerHandler.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Maui.Handlers;
using Microsoft.Maui.Graphics;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Platform;
using SkiaSharp;

namespace Microsoft.Maui.Platform.Linux.Handlers;

/// <summary>
/// Handler for DatePicker on Linux using Skia rendering.
/// </summary>
public partial class DatePickerHandler : ViewHandler<IDatePicker, SkiaDatePicker>
{
    public static IPropertyMapper<IDatePicker, DatePickerHandler> Mapper =
        new PropertyMapper<IDatePicker, DatePickerHandler>(ViewHandler.ViewMapper)
        {
            [nameof(IDatePicker.Date)] = MapDate,
            [nameof(IDatePicker.MinimumDate)] = MapMinimumDate,
            [nameof(IDatePicker.MaximumDate)] = MapMaximumDate,
            [nameof(IDatePicker.Format)] = MapFormat,
            [nameof(IDatePicker.TextColor)] = MapTextColor,
            [nameof(IDatePicker.CharacterSpacing)] = MapCharacterSpacing,
            [nameof(ITextStyle.Font)] = MapFont,
            [nameof(IView.Background)] = MapBackground,
        };

    public static CommandMapper<IDatePicker, DatePickerHandler> CommandMapper =
        new(ViewHandler.ViewCommandMapper)
        {
        };

    public DatePickerHandler() : base(Mapper, CommandMapper)
    {
    }

    public DatePickerHandler(IPropertyMapper? mapper, CommandMapper? commandMapper = null)
        : base(mapper ?? Mapper, commandMapper ?? CommandMapper)
    {
    }

    protected override SkiaDatePicker CreatePlatformView()
    {
        return new SkiaDatePicker();
    }

    protected override void ConnectHandler(SkiaDatePicker platformView)
    {
        base.ConnectHandler(platformView);
        platformView.DateSelected += OnDateSelected;

        // Apply dark theme colors if dark mode is active
        var current = Application.Current;
        if (current != null && (int)current.UserAppTheme == 2) // Dark theme
        {
            platformView.CalendarBackgroundColor = Color.FromRgb(30, 30, 30);
            platformView.TextColor = Color.FromRgb(224, 224, 224);
            platformView.BorderColor = Color.FromRgb(97, 97, 97);
            platformView.DisabledDayColor = Color.FromRgb(97, 97, 97);
            platformView.BackgroundColor = Color.FromRgb(45, 45, 45).ToSKColor();
        }
    }

    protected override void DisconnectHandler(SkiaDatePicker platformView)
    {
        platformView.DateSelected -= OnDateSelected;
        base.DisconnectHandler(platformView);
    }

    private void OnDateSelected(object? sender, DateChangedEventArgs e)
    {
        if (VirtualView is null || PlatformView is null) return;

        VirtualView.Date = e.NewDate;
    }

    public static void MapDate(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;
        handler.PlatformView.Date = datePicker.Date;
    }

    public static void MapMinimumDate(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;
        handler.PlatformView.MinimumDate = datePicker.MinimumDate;
    }

    public static void MapMaximumDate(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;
        handler.PlatformView.MaximumDate = datePicker.MaximumDate;
    }

    public static void MapFormat(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;
        handler.PlatformView.Format = datePicker.Format ?? "d";
    }

    public static void MapTextColor(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;
        if (datePicker.TextColor is not null)
        {
            handler.PlatformView.TextColor = datePicker.TextColor;
        }
    }

    public static void MapCharacterSpacing(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;
        handler.PlatformView.CharacterSpacing = datePicker.CharacterSpacing;
    }

    public static void MapFont(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;

        var font = datePicker.Font;
        if (font.Size > 0)
            handler.PlatformView.FontSize = font.Size;

        if (!string.IsNullOrEmpty(font.Family))
            handler.PlatformView.FontFamily = font.Family;

        // Map FontAttributes from the Font weight/slant
        var attrs = FontAttributes.None;
        if (font.Weight >= FontWeight.Bold)
            attrs |= FontAttributes.Bold;
        // Note: Font.Slant for italic would require checking FontSlant
        handler.PlatformView.FontAttributes = attrs;
    }

    public static void MapBackground(DatePickerHandler handler, IDatePicker datePicker)
    {
        if (handler.PlatformView is null) return;

        if (datePicker.Background is SolidPaint solidPaint && solidPaint.Color is not null)
        {
            handler.PlatformView.BackgroundColor = solidPaint.Color.ToSKColor();
        }
    }
}