Steven Kirk
7 years ago
15 changed files with 302 additions and 251 deletions
@ -0,0 +1,28 @@ |
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using System; |
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namespace Avalonia.Controls |
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{ |
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public static class PseudolassesExtensions |
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{ |
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/// <summary>
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/// Adds or removes a pseudoclass depending on a boolean value.
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/// </summary>
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/// <param name="classes">The pseudoclasses collection.</param>
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/// <param name="name">The name of the pseudoclass to set.</param>
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/// <param name="value">True to add the pseudoclass or false to remove.</param>
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public static void Set(this IPseudoClasses classes, string name, bool value) |
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{ |
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Contract.Requires<ArgumentNullException>(classes != null); |
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if (value) |
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{ |
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classes.Add(name); |
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} |
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else |
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{ |
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classes.Remove(name); |
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} |
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} |
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} |
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} |
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@ -1,120 +0,0 @@ |
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using System; |
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using System.Collections.Generic; |
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using Avalonia.Controls; |
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namespace Avalonia |
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{ |
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internal static class PseudoclassEngine |
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{ |
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private static Dictionary<Type, List<IEntry>> _entries = new Dictionary<Type, List<IEntry>>(); |
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private static Dictionary<AvaloniaProperty, List<IEntry>> _properties = new Dictionary<AvaloniaProperty, List<IEntry>>(); |
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private static Dictionary<Type, List<IEntry>> _cache = new Dictionary<Type, List<IEntry>>(); |
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public static void Created(StyledElement element) |
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{ |
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var t = element.GetType(); |
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if (!_cache.TryGetValue(t, out var list)) |
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{ |
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list = new List<IEntry>(); |
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foreach (var i in _entries) |
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{ |
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if (i.Key.IsAssignableFrom(t)) |
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{ |
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list.AddRange(i.Value); |
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} |
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} |
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_cache.Add(t, list); |
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} |
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foreach (var i in list) |
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{ |
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i.Update(element); |
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} |
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} |
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public static void Register<T>( |
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Type type, |
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AvaloniaProperty<T> property, |
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Func<T, bool> selector, |
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string className) |
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{ |
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if (!_entries.TryGetValue(type, out var list)) |
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{ |
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list = new List<IEntry>(); |
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_entries.Add(type, list); |
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} |
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var entry = new Entry<T>(type, property, selector, className); |
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list.Add(entry); |
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if (!_properties.TryGetValue(property, out list)) |
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{ |
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list = new List<IEntry>(); |
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_properties.Add(property, list); |
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property.Changed.Subscribe(ValueChanged); |
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} |
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list.Add(entry); |
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} |
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private static void ValueChanged(AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (e.Sender is StyledElement element && |
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_properties.TryGetValue(e.Property, out var list)) |
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{ |
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var t = e.Sender.GetType(); |
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foreach (var i in list) |
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{ |
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if (i.Type.IsAssignableFrom(t)) |
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{ |
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i.Update(element); |
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} |
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} |
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} |
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} |
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private interface IEntry |
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{ |
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Type Type { get; } |
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void Update(StyledElement element); |
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} |
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private class Entry<T> : IEntry |
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{ |
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public Entry( |
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Type type, |
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AvaloniaProperty<T> property, |
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Func<T, bool> selector, |
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string className) |
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{ |
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Type = type; |
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Property = property; |
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Selector = selector; |
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ClassName = className; |
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} |
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public Type Type { get; } |
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public AvaloniaProperty<T> Property { get; } |
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public Func<T, bool> Selector { get; } |
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public string ClassName { get; } |
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public void Update(StyledElement element) |
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{ |
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var value = element.GetValue(Property); |
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if (Selector(value)) |
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{ |
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((IPseudoClasses)element.Classes).Add(ClassName); |
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} |
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else |
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{ |
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((IPseudoClasses)element.Classes).Remove(ClassName); |
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} |
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} |
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} |
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} |
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} |
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