Add shortcut components

Ched/Ched.csproj

@@ -167,6 +167,9 @@
     <Compile Include="Plugins\SlideSplitter.cs" />
     <Compile Include="Plugins\SusExportPlugin.cs" />
     <Compile Include="UI\Helpers.cs" />
+    <Compile Include="UI\Shortcuts\ShortcutCommandSource.cs" />
+    <Compile Include="UI\Shortcuts\ShortcutKeySource.cs" />
+    <Compile Include="UI\Shortcuts\ShortcutManager.cs" />
     <Compile Include="UI\Windows\Behaviors\InitialFocusBehavior.cs" />
     <Compile Include="UI\Windows\Behaviors\OpenFileBehavior.cs" />
     <Compile Include="UI\Windows\Behaviors\StyleBehaviorCollection.cs" />

Ched/UI/Shortcuts/ShortcutCommandSource.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Ched.UI.Shortcuts
+{
+    public interface IShortcutCommandSource
+    {
+        /// <summary>
+        /// 指定のコマンドを実行します。
+        /// </summary>
+        /// <param name="command">実行するコマンド</param>
+        /// <returns>コマンドが実行された場合はTrue</returns>
+        bool ExecuteCommand(string command);
+
+        bool ResolveCommandName(string command, out string name);
+    }
+
+    public class NullShortcutCommandSource : IShortcutCommandSource
+    {
+        // Do nothing
+        public bool ExecuteCommand(string command) => true;
+
+        public bool ResolveCommandName(string command, out string name)
+        {
+            name = null;
+            return false;
+        }
+    }
+}

Ched/UI/Shortcuts/ShortcutKeySource.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Ched.UI.Shortcuts
+{
+    public interface IShortcutKeySource
+    {
+        /// <summary>
+        /// 指定のショートカットキーに対応するコマンドを取得します。
+        /// </summary>
+        /// <param name="key">コマンドを取得するショートカットキー</param>
+        /// <param name="command">ショートカットキーに対応するコマンド</param>
+        /// <returns>ショートカットキーに対応するコマンドが存在すればTrue</returns>
+        bool ResolveCommand(Keys key, out string command);
+
+        /// <summary>
+        /// 指定のコマンドに対応するショートカットキーを取得します。
+        /// </summary>
+        /// <param name="command">ショートカットキーを取得するコマンド</param>
+        /// <param name="key">コマンドに対応するショートカットキー</param>
+        /// <returns>コマンドに対応するショートカットキーが存在すればTrue</returns>
+        bool ResolveShortcutKey(string command, out Keys key);
+    }
+
+    public class NullShortcutKeySource : IShortcutKeySource
+    {
+        public bool ResolveCommand(Keys key, out string command)
+        {
+            command = null;
+            return false;
+        }
+
+        public bool ResolveShortcutKey(string command, out Keys key)
+        {
+            key = Keys.None;
+            return false;
+        }
+    }
+
+    public abstract class ShortcutKeySource : IShortcutKeySource
+    {
+        private Dictionary<Keys, string> KeyMap { get; } = new Dictionary<Keys, string>();
+        private Dictionary<string, HashSet<Keys>> CommandMap { get; } = new Dictionary<string, HashSet<Keys>>();
+
+        public IEnumerable<Keys> ShortcutKeys => KeyMap.Keys;
+
+        public ShortcutKeySource()
+        {
+        }
+
+        protected ShortcutKeySource(ShortcutKeySource other)
+        {
+            foreach (var item in other.KeyMap)
+            {
+                RegisterShortcut(item.Value, item.Key);
+            }
+        }
+
+        protected void RegisterShortcut(string command, Keys key)
+        {
+            // キーの重複を確認。コマンドは重複してもよい(異なるキーから同じコマンドを呼び出しても問題ない)
+            if (KeyMap.ContainsKey(key)) throw new InvalidOperationException("The shortcut key has already been registered.");
+            KeyMap.Add(key, command);
+            if (!CommandMap.ContainsKey(command)) CommandMap.Add(command, new HashSet<Keys>());
+            CommandMap[command].Add(key);
+        }
+
+        public bool ResolveCommand(Keys key, out string command) => KeyMap.TryGetValue(key, out command);
+
+        public bool ResolveShortcutKey(string command, out Keys key)
+        {
+            key = Keys.None;
+            if (!CommandMap.TryGetValue(command, out HashSet<Keys> keys)) return false;
+            if (keys.Count > 0)
+            {
+                key = keys.First();
+                return true;
+            }
+            return false;
+        }
+    }
+}

Ched/UI/Shortcuts/ShortcutManager.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Ched.UI.Shortcuts
+{
+    public class ShortcutManager
+    {
+        public IShortcutCommandSource CommandSource { get; set; } = new NullShortcutCommandSource();
+        public IShortcutKeySource DefaultKeySource { get; set; } = new NullShortcutKeySource();
+        public IShortcutKeySource UserKeySource { get; set; } = new NullShortcutKeySource();
+
+        public bool ExecuteCommand(Keys key)
+        {
+            bool Resolve(IShortcutKeySource source)
+            {
+                if (source.ResolveCommand(key, out string command))
+                {
+                    return CommandSource.ExecuteCommand(command);
+                }
+                return false;
+            }
+
+            // User, Defaultの順にトラバースしてひっかける
+            return Resolve(UserKeySource) || Resolve(DefaultKeySource);
+        }
+
+        public bool ResolveShortcutKey(string command, out Keys key)
+        {
+            return UserKeySource.ResolveShortcutKey(command, out key) || DefaultKeySource.ResolveShortcutKey(command, out key);
+        }
+    }
+}