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Add settings files on the app builder
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.IO; | ||
| using System.Text.Json; | ||
|
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| namespace AvaloniaExtensions; | ||
|
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| public sealed class SettingsFiles { | ||
| public static SettingsFiles Get { get; } = new SettingsFiles(); | ||
|
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| private readonly Dictionary<Type, SettingsFile> _settingsFiles = new(); | ||
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| /// <summary> | ||
| /// Add a settings file. It'll save the settings file when closing the app. | ||
| /// </summary> | ||
| /// <param name="path">The location of the settings file. You can use './filename.json' to save it in the apps dir.</param> | ||
| /// <typeparam name="T">The type of the settings class.</typeparam> | ||
| /// <returns></returns> | ||
| public void AddSettingsFile<T>(string path) where T : class, new() => AddSettingsFile(path, () => new T()); | ||
|
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| /// <summary> | ||
| /// Add a settings file. It'll save the settings file when closing the app. | ||
| /// </summary> | ||
| /// <param name="path">The location of the settings file. You can use './filename.json' to save it in the apps dir.</param> | ||
| /// <param name="constructorLambda">A lambda function to construct the settings object if it can't be loaded.</param> | ||
| /// <typeparam name="T">The type of the settings class.</typeparam> | ||
| /// <returns></returns> | ||
| public void AddSettingsFile<T>(string path, Func<T> constructorLambda) where T : class { | ||
| var settings = LoadOrCreateSettings(path, constructorLambda); | ||
| _settingsFiles.Add(typeof(T), new SettingsFile(path, settings)); | ||
| } | ||
|
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| private T LoadOrCreateSettings<T>(string path, Func<T> constructorLambda) where T : class { | ||
| try { | ||
| using var stream = File.OpenRead(CompletePath(path)); | ||
| var result = JsonSerializer.Deserialize<T>(stream); | ||
| return result ?? constructorLambda(); | ||
| } catch (Exception e) { | ||
| Console.Error.WriteLine("An avalonia extensions app encountered an error while loading a settings file." + | ||
| $"Settings type: '{typeof(T)}', error: '{e.Message}'."); | ||
| return constructorLambda(); | ||
| } | ||
| } | ||
|
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| public bool SaveSettings() { | ||
| bool allSavedSuccessfully = true; | ||
| foreach (var (type, settingsFile) in _settingsFiles) { | ||
| try { | ||
| using var stream = File.Create(CompletePath(settingsFile.Path)); | ||
| JsonSerializer.Serialize(stream, settingsFile.Settings); | ||
| } catch (Exception e) { | ||
| allSavedSuccessfully = false; | ||
| Console.Error.WriteLine("An avalonia extensions app encountered an error while saving a settings file." + | ||
| $"Settings type: '{type}', error: '{e.Message}'."); | ||
| } | ||
| } | ||
| return allSavedSuccessfully; | ||
| } | ||
|
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| private string CompletePath(string path) { | ||
| if (string.IsNullOrWhiteSpace(path)) { | ||
| path = "./settings.json"; | ||
| } | ||
| if (path.Substring(0, 2) == "./") { | ||
| path = AssetExtensions.StartupPath + path.Substring(1); | ||
| } | ||
| return path; | ||
| } | ||
|
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| public void ResetSettings<T>() where T : class, new() => OverwriteSettings(new T()); | ||
| public void ResetSettings<T>(Func<T> constructorLambda) where T : class => OverwriteSettings(constructorLambda()); | ||
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| public void OverwriteSettings<T>(T settings) where T : class { | ||
| if (!_settingsFiles.TryGetValue(typeof(T), out SettingsFile? originalSettingsFile)) { | ||
| throw new InvalidOperationException($"Cannot find settings with type {typeof(T)}. " | ||
| + "You can add it with the 'WithSettingsFile' or 'AddSettingsFile' method."); | ||
| } | ||
| _settingsFiles[typeof(T)] = originalSettingsFile with { Settings = settings }; | ||
| } | ||
|
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| public T GetSettings<T>() where T : class { | ||
| if (!_settingsFiles.TryGetValue(typeof(T), out SettingsFile? settingsFile)) { | ||
| throw new InvalidOperationException($"Cannot find settings with type {typeof(T)}. " | ||
| + "You can add it with the 'WithSettingsFile' or 'AddSettingsFile' method."); | ||
| } | ||
| if (settingsFile.Settings is not T settings) { | ||
| throw new InvalidOperationException($"Cannot cast settings with type {typeof(T)} to its type, weird."); | ||
| } | ||
| return settings; | ||
| } | ||
|
|
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| private record SettingsFile(string Path, object Settings); | ||
| } |
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