| | | 1 | | // ----------------------------------------------------------------------- |
| | | 2 | | // <copyright file="CultureBoundValue.cs" company="Stéphane ANDRE"> |
| | | 3 | | // Copyright (c) Stéphane ANDRE. All rights reserved. |
| | | 4 | | // </copyright> |
| | | 5 | | // ----------------------------------------------------------------------- |
| | | 6 | | |
| | | 7 | | using System; |
| | | 8 | | using System.Globalization; |
| | | 9 | | using MyNet.Globalization.Culture; |
| | | 10 | | using MyNet.Globalization.Facade; |
| | | 11 | | using MyNet.Observable.Behaviors.Metadata.Features.Events; |
| | | 12 | | using MyNet.Observable.Metadata; |
| | | 13 | | |
| | | 14 | | #pragma warning disable IDE0130 // Namespace does not match folder structure |
| | | 15 | | namespace MyNet.Observable; |
| | | 16 | | #pragma warning restore IDE0130 // Namespace does not match folder structure |
| | | 17 | | |
| | | 18 | | /// <summary> |
| | | 19 | | /// Observable value recomputed when the application culture changes, with per-culture caching. |
| | | 20 | | /// </summary> |
| | | 21 | | [ExemptFromGeneratedMetadata] |
| | | 22 | | public class CultureBoundValue<T> : ObservableObject, IObservableValue<T>, IEventAware<CultureChangedEvent> |
| | | 23 | | { |
| | | 24 | | private readonly Func<T?> _valueFactory; |
| | | 25 | | private readonly ICultureService _cultureService; |
| | | 26 | | private CultureInfo? _cachedCulture; |
| | | 27 | | private T? _cachedValue; |
| | | 28 | | private bool _hasCachedValue; |
| | | 29 | | |
| | | 30 | | /// <summary> |
| | | 31 | | /// Initializes a new instance of the <see cref="CultureBoundValue{T}"/> class that uses <see cref="GlobalizationSer |
| | | 32 | | /// </summary> |
| | | 33 | | /// <param name="valueFactory">Factory invoked when the value must be computed for the current culture.</param> |
| | | 34 | | public CultureBoundValue(Func<T?> valueFactory) |
| | 246 | 35 | | : this(valueFactory, GlobalizationServices.Current) { } |
| | | 36 | | |
| | | 37 | | /// <summary> |
| | | 38 | | /// Initializes a new instance of the <see cref="CultureBoundValue{T}"/> class with an explicit culture service. |
| | | 39 | | /// </summary> |
| | | 40 | | /// <param name="valueFactory">Factory invoked when the value must be computed for the current culture.</param> |
| | | 41 | | /// <param name="cultureService">Culture service used to detect culture changes.</param> |
| | 144 | 42 | | public CultureBoundValue(Func<T?> valueFactory, ICultureService cultureService) |
| | | 43 | | { |
| | 144 | 44 | | _valueFactory = valueFactory ?? throw new ArgumentNullException(nameof(valueFactory)); |
| | 144 | 45 | | _cultureService = cultureService ?? throw new ArgumentNullException(nameof(cultureService)); |
| | 144 | 46 | | this.ReactOnCultureChanged(cultureService); |
| | 144 | 47 | | } |
| | | 48 | | |
| | | 49 | | /// <inheritdoc /> |
| | 162 | 50 | | public virtual T? Value => GetOrCompute(); |
| | | 51 | | |
| | | 52 | | /// <inheritdoc /> |
| | | 53 | | public virtual void OnEvent(CultureChangedEvent e) |
| | | 54 | | { |
| | 135 | 55 | | _hasCachedValue = false; |
| | 135 | 56 | | NotifyPropertyChanged(nameof(Value)); |
| | 135 | 57 | | } |
| | | 58 | | |
| | | 59 | | /// <inheritdoc /> |
| | 0 | 60 | | public override string? ToString() => Value?.ToString(); |
| | | 61 | | |
| | | 62 | | private T? GetOrCompute() |
| | | 63 | | { |
| | 162 | 64 | | var culture = _cultureService.CurrentCulture; |
| | | 65 | | |
| | 162 | 66 | | if (_hasCachedValue && Equals(_cachedCulture, culture)) |
| | 30 | 67 | | return _cachedValue; |
| | | 68 | | |
| | 132 | 69 | | _cachedCulture = culture; |
| | 132 | 70 | | _cachedValue = _valueFactory(); |
| | 132 | 71 | | _hasCachedValue = true; |
| | 132 | 72 | | return _cachedValue; |
| | | 73 | | } |
| | | 74 | | } |
| | | 75 | | |