67 lines
2.2 KiB
C#
67 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace Cryville.Crtr.Browsing.Actions {
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public class ActionManager {
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readonly Dictionary<Type, List<IResourceAction>> _actions = new Dictionary<Type, List<IResourceAction>>();
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public event Action Changed;
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class ActionPriorityComparer : IComparer<IResourceAction> {
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public static readonly ActionPriorityComparer Instance = new ActionPriorityComparer();
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public int Compare(IResourceAction x, IResourceAction y) {
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return x.Priority.CompareTo(y.Priority);
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}
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}
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void Register(Type type, IResourceAction action) {
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List<IResourceAction> actions;
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if (!_actions.TryGetValue(type, out actions)) {
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_actions.Add(type, actions = new List<IResourceAction>());
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}
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int index = actions.BinarySearch(action, ActionPriorityComparer.Instance);
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if (index < 0) index = ~index;
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actions.Insert(index, action);
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Changed?.Invoke();
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}
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public void Register(IResourceAction action) {
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Register(typeof(object), action);
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}
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public void Register<T>(IResourceAction<T> action) where T : IResourceMeta {
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Register(typeof(T), action);
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}
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public void Unregister(Type type, IResourceAction action) {
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List<IResourceAction> actions;
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if (!_actions.TryGetValue(type, out actions)) return;
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actions.Remove(action);
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Changed?.Invoke();
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}
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public void Unregister(IResourceAction action) {
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Unregister(typeof(object), action);
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}
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public void Unregister<T>(IResourceAction<T> action) where T : IResourceMeta {
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Unregister(typeof(T), action);
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}
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public IEnumerable<IResourceAction> GetActions(Uri uri, IResourceMeta res) {
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return GetActions(uri, res, res.GetType());
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}
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IEnumerable<IResourceAction> GetActions(Uri uri, IResourceMeta res, Type type) {
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if (type == null) return Enumerable.Empty<IResourceAction>();
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List<IResourceAction> actions;
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IEnumerable<IResourceAction> result;
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if (_actions.TryGetValue(type, out actions))
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result = actions.Where(i => i.CanInvoke(uri, res));
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else
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result = Enumerable.Empty<IResourceAction>();
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if (type != typeof(object))
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result = result
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.Concat(GetActions(uri, res, type.BaseType))
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.Concat(type.GetInterfaces().SelectMany(i => GetActions(uri, res, i)));
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return result;
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}
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}
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}
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