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| 1 | +using Gum.DataTypes; |
| 2 | +using Gum.Managers; |
| 3 | +using Gum.Wireframe; |
| 4 | +using GumRuntime; |
| 5 | +using RenderingLibrary; |
| 6 | +using System; |
| 7 | +using System.Collections.Generic; |
| 8 | +using System.IO; |
| 9 | +using System.Linq; |
| 10 | + |
| 11 | +#if XNALIKE |
| 12 | +namespace MonoGameGum; |
| 13 | +#elif RAYLIB |
| 14 | +namespace RaylibGum; |
| 15 | +#endif |
| 16 | + |
| 17 | +public interface IGumHotReloadManager |
| 18 | +{ |
| 19 | + event Action? ReloadCompleted; |
| 20 | + void Start(string absoluteGumxSourcePath); |
| 21 | + void Stop(); |
| 22 | + void Update(GraphicalUiElement root); |
| 23 | +} |
| 24 | + |
| 25 | +public class GumHotReloadManager : IGumHotReloadManager |
| 26 | +{ |
| 27 | + private string _projectSourcePath = ""; |
| 28 | + private FileSystemWatcher? _watcher; |
| 29 | + private volatile bool _pendingReload; |
| 30 | + private DateTime _lastChangeTime; |
| 31 | + |
| 32 | + public event Action? ReloadCompleted; |
| 33 | + |
| 34 | + public void Start(string absoluteGumxSourcePath) |
| 35 | + { |
| 36 | + _projectSourcePath = absoluteGumxSourcePath; |
| 37 | + |
| 38 | + var directory = Path.GetDirectoryName(absoluteGumxSourcePath) |
| 39 | + ?? throw new ArgumentException("Cannot determine directory from path.", nameof(absoluteGumxSourcePath)); |
| 40 | + |
| 41 | + _watcher = new FileSystemWatcher(directory) |
| 42 | + { |
| 43 | + NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName, |
| 44 | + IncludeSubdirectories = true, |
| 45 | + EnableRaisingEvents = true |
| 46 | + }; |
| 47 | + |
| 48 | + _watcher.Changed += HandleFileChange; |
| 49 | + _watcher.Created += HandleFileChange; |
| 50 | + _watcher.Renamed += (sender, e) => HandleFileChange(sender, e); |
| 51 | + } |
| 52 | + |
| 53 | + public void Stop() |
| 54 | + { |
| 55 | + if (_watcher != null) |
| 56 | + { |
| 57 | + _watcher.EnableRaisingEvents = false; |
| 58 | + _watcher.Dispose(); |
| 59 | + _watcher = null; |
| 60 | + } |
| 61 | + } |
| 62 | + |
| 63 | + public void Update(GraphicalUiElement root) |
| 64 | + { |
| 65 | + if (_pendingReload && (DateTime.UtcNow - _lastChangeTime) >= TimeSpan.FromMilliseconds(200)) |
| 66 | + { |
| 67 | + _pendingReload = false; |
| 68 | + PerformReload(root); |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + private void HandleFileChange(object sender, FileSystemEventArgs e) |
| 73 | + { |
| 74 | + var extension = Path.GetExtension(e.FullPath).ToLowerInvariant(); |
| 75 | + if (extension == ".gumx" || extension == ".gucx" || extension == ".gusx" || extension == ".gutx") |
| 76 | + { |
| 77 | + _pendingReload = true; |
| 78 | + _lastChangeTime = DateTime.UtcNow; |
| 79 | + } |
| 80 | + } |
| 81 | + |
| 82 | + private void PerformReload(GraphicalUiElement root) |
| 83 | + { |
| 84 | + GumProjectSave newProject = GumProjectSave.Load(_projectSourcePath); |
| 85 | + newProject.Initialize(); |
| 86 | + ObjectFinder.Self.GumProjectSave = newProject; |
| 87 | + |
| 88 | + var byName = new Dictionary<string, ElementSave>(StringComparer.OrdinalIgnoreCase); |
| 89 | + foreach (var element in newProject.AllElements) |
| 90 | + { |
| 91 | + byName[element.Name] = element; |
| 92 | + } |
| 93 | + |
| 94 | + // Snapshot element names before modifying the collection |
| 95 | + var childElementNames = root.Children |
| 96 | + .Select(c => c.ElementSave?.Name) |
| 97 | + .ToList(); |
| 98 | + |
| 99 | + // Remove existing children |
| 100 | + foreach (var child in root.Children.ToList()) |
| 101 | + { |
| 102 | + child.RemoveFromManagers(); |
| 103 | + child.Parent = null; |
| 104 | + } |
| 105 | + |
| 106 | + // Recreate each child from the updated ElementSave, preserving order |
| 107 | + foreach (var name in childElementNames) |
| 108 | + { |
| 109 | + if (name != null && byName.TryGetValue(name, out var newEs)) |
| 110 | + { |
| 111 | + var newChild = newEs.ToGraphicalUiElement(ISystemManagers.Default, addToManagers: false); |
| 112 | + root.Children.Add(newChild); |
| 113 | + } |
| 114 | + } |
| 115 | + |
| 116 | + ReloadCompleted?.Invoke(); |
| 117 | + } |
| 118 | +} |
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