check point

framework/MaterialSkin.Core/Controls/MaterialLoader.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace MaterialSkin.Controls
+{
+    public partial class MaterialLoader : MaterialForm
+    {
+        private static MaterialLoader _instance;
+        private static Thread _loaderThread;
+        private static ManualResetEvent _instanceReadyEvent = new ManualResetEvent(false);
+        private readonly Dictionary<string, (MaterialProgressBar ProgressBar, Label Label)> _loadingProcesses;
+
+        private MaterialLoader()
+        {
+            InitializeComponent();
+            RemoveMessageFilter();
+            _loadingProcesses = new Dictionary<string, (MaterialProgressBar, Label)>();
+            this.MaximizeBox = false;
+            this.MinimizeBox = false;
+            this.StartPosition = FormStartPosition.CenterScreen;
+        }
+
+        public static MaterialLoader Instance
+        {
+            get
+            {
+                if (_instance == null || _instance.IsDisposed)
+                {
+                    _instanceReadyEvent.Reset();
+                    _loaderThread = new Thread(() =>
+                    {
+                        _instance = new MaterialLoader();
+                        _instance.Shown += (_, _) =>
+                        {
+                            _instanceReadyEvent.Set();
+                        };
+                        Application.Run(_instance);
+                    });
+                    _loaderThread.SetApartmentState(ApartmentState.STA);
+                    _loaderThread.Start();
+                    _instanceReadyEvent.WaitOne();
+                }
+                return _instance;
+            }
+        }
+
+        public void StartLoading(string title)
+        {
+            if (_instance == null || !_instance.Visible)
+            {
+                Instance.Invoke(new Action(() =>
+                {
+                    Instance.Show();
+                    Instance.Visible= true;
+                }));
+            }
+
+            Instance.Invoke(new Action(() =>
+            {
+                if (_loadingProcesses.ContainsKey(title))
+                {
+                    return; // Prevent duplicate loading processes with the same title
+                }
+
+                var progressBar = new MaterialProgressBar
+                {
+                    Width = Instance.ClientSize.Width - 20,
+                    Height = 20,
+                    Top = 50 + (_loadingProcesses.Count * 30),
+                    Left = 10,
+                    Style = ProgressBarStyle.Marquee,
+                    MarqueeAnimationSpeed = 30,
+                    Value = 50,
+                    BackColor = Color.White
+                };
+
+                var label = new Label
+                {
+                    Text = title,
+                    AutoSize = true,
+                    Top = progressBar.Top - 20,
+                    Left = progressBar.Left,
+                    BackColor = Color.White
+                };
+
+                _loadingProcesses[title] = (progressBar, label);
+                Instance.Controls.Add(label);
+                Instance.Controls.Add(progressBar);
+                Instance.Height = 50 + (_loadingProcesses.Count * 30);
+                Instance.Refresh();
+            }));
+        }
+
+        public void FinishLoading(string title)
+        {
+            if (_instance == null)
+            {
+                return;
+            }
+
+            Instance.Invoke(new Action(() =>
+            {
+                if (_loadingProcesses.TryGetValue(title, out var components))
+                {
+                    Instance.Controls.Remove(components.ProgressBar);
+                    Instance.Controls.Remove(components.Label);
+                    _loadingProcesses.Remove(title);
+                    RearrangeProgressBarsAndLabels();
+                }
+
+                if (_loadingProcesses.Count == 0)
+                {
+                    Instance.Visible= false;
+                }
+            }));
+        }
+
+        private void RearrangeProgressBarsAndLabels()
+        {
+            int index = 0;
+            foreach (var components in _loadingProcesses.Values)
+            {
+                components.ProgressBar.Top = 50 + (index * 30);
+                components.Label.Top = components.ProgressBar.Top - 20;
+                index++;
+            }
+
+            this.Height = 50 + (_loadingProcesses.Count * 30);
+        }
+    }
+}