FoxTube/FoxTube/Controls/LiveCaptions.xaml.cs

using FoxTube.Classes;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Xml;
using System.Diagnostics;

// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236

namespace FoxTube.Controls
{
    public sealed partial class LiveCaptions : UserControl
    {
        public MediaElement Player { get; set; }
        DispatcherTimer timer = new DispatcherTimer() { Interval = TimeSpan.FromMilliseconds(10) };
        List<Caption> captions = new List<Caption>();
        Caption currentCaption = null;

        public LiveCaptions()
        {
            this.InitializeComponent();
            timer.Tick += UpdateCaption;
        }

        private void UpdateCaption(object sender, object e)
        {
            TimeSpan currentPosition = Player.Position;

            bool found = false;
            captions.ForEach((x) =>
            {
                if (Player.Position >= x.Start && Player.Position <= x.End)
                {
                    currentCaption = x;
                    text.Text = currentCaption.Text;
                    Visibility = Visibility.Visible;
                    found = true;
                }
            });

            if (!found)
            {
                currentCaption = null;
                Visibility = Visibility.Collapsed;
            }
        }

        public void Initialize(string source)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(source);

            foreach (XmlElement i in doc["timedtext"]["body"].ChildNodes)
                captions.Add(new Caption(int.Parse(i.GetAttribute("t")), int.Parse(i.GetAttribute("d")), i.InnerText));

            captions.ForEach((x) =>
            {
                if(Player.Position > x.Start && Player.Position < x.End)
                {
                    currentCaption = x;
                    text.Text = currentCaption.Text;
                    Visibility = Visibility.Visible;
                }
            });

            timer.Start();
        }

        public void Close()
        {
            captions.Clear();
            currentCaption = null;
            Visibility = Visibility.Collapsed;
            timer.Stop();
        }
    }
}