3rdpartylibs/fastreports.wpf/FastReport/Utils/Throttle.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace FastReport.Utils
{
    internal static class Throttle
    {
        private static readonly Dictionary<Action, Timer> timers = new Dictionary<Action, Timer>();
        private static int suppressCount = 0;

        public static void Execute(Action action, int interval = 50)
        {
#if (WPF || AVALONIA)
            // in WinForms, this may lead to exception (case: close designer and press "Yes" to save file => NRE)
            if (timers.ContainsKey(action))
            {
                var timer = timers[action];
                timer.Stop();
                timer.Start();
                suppressCount++;
            }
            else
            {
                var timer = new Timer() { Interval = interval };
                timer.Tick += (s, e) =>
                {
                    timer.Dispose();
                    timers.Remove(action);
                    if (action.Target is Control control && control.IsDisposed)
                        return;
                    action();
                };
                timers.Add(action, timer);
                timer.Start();
            }
#else
            action();
#endif
        }
    }
}