FeedCenter/Application/MainWindow/Timer.cs

using FeedCenter.Properties;
using System;
using System.Timers;
using System.Windows.Threading;

namespace FeedCenter;

public partial class MainWindow
{
    private Timer _mainTimer;
    private DateTime _lastFeedRead;
    private DateTime _lastFeedDisplay;
    private Dispatcher _dispatcher;

    private void InitializeTimer()
    {
        _dispatcher = Dispatcher.CurrentDispatcher;

        _mainTimer = new Timer { Interval = 1000 };
        _mainTimer.Elapsed += HandleMainTimerElapsed;
    }

    private void TerminateTimer()
    {
        StopTimer();

        _mainTimer?.Dispose();
        _mainTimer = null;
    }

    private void StartTimer()
    {
        _mainTimer?.Start();
    }

    private void StopTimer()
    {
        _mainTimer?.Stop();
    }

    private void HandleMainTimerElapsed(object sender, EventArgs e)
    {
        _dispatcher.Invoke(() =>
        {
            // If the background worker is busy then don't do anything
            if (_feedReadWorker.IsBusy)
                return;

            // Stop the timer for now
            StopTimer();

            // Move to the next feed if the scroll interval has expired and the mouse isn't hovering
            if (LinkTextList.IsMouseOver)
                _lastFeedDisplay = DateTime.Now;
            else if (DateTime.Now - _lastFeedDisplay >= Settings.Default.FeedScrollInterval)
                NextFeed();

            // Check to see if we should try to read the feeds
            if (DateTime.Now - _lastFeedRead >= Settings.Default.FeedCheckInterval)
                ReadFeeds();

            // Get the timer going again
            StartTimer();
        });
    }
}