Wino-Mail/Wino.Calendar/Controls/DayHeaderControl.cs

using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Wino.Core.Domain.Enums;

namespace Wino.Calendar.Controls;

public partial class DayHeaderControl : Control
{
    private const string PART_DayHeaderTextBlock = nameof(PART_DayHeaderTextBlock);
    private TextBlock HeaderTextblock;

    public DayHeaderDisplayType DisplayType
    {
        get { return (DayHeaderDisplayType)GetValue(DisplayTypeProperty); }
        set { SetValue(DisplayTypeProperty, value); }
    }

    public DateTime Date
    {
        get { return (DateTime)GetValue(DateProperty); }
        set { SetValue(DateProperty, value); }
    }

    public static readonly DependencyProperty DateProperty = DependencyProperty.Register(nameof(Date), typeof(DateTime), typeof(DayHeaderControl), new PropertyMetadata(default(DateTime), new PropertyChangedCallback(OnHeaderPropertyChanged)));
    public static readonly DependencyProperty DisplayTypeProperty = DependencyProperty.Register(nameof(DisplayType), typeof(DayHeaderDisplayType), typeof(DayHeaderControl), new PropertyMetadata(DayHeaderDisplayType.TwentyFourHour, new PropertyChangedCallback(OnHeaderPropertyChanged)));

    public DayHeaderControl()
    {
        DefaultStyleKey = typeof(DayHeaderControl);
    }

    protected override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        HeaderTextblock = GetTemplateChild(PART_DayHeaderTextBlock) as TextBlock;
        UpdateHeaderText();
    }

    private static void OnHeaderPropertyChanged(DependencyObject control, DependencyPropertyChangedEventArgs e)
    {
        if (control is DayHeaderControl headerControl)
        {
            headerControl.UpdateHeaderText();
        }
    }

    private void UpdateHeaderText()
    {
        if (HeaderTextblock != null)
        {
            HeaderTextblock.Text = DisplayType == DayHeaderDisplayType.TwelveHour ? Date.ToString("h tt") : Date.ToString("HH:mm");
        }
    }
}