chain of responsibility

Author: T0shik

README.md

@@ -26,3 +26,4 @@ Full Playlist can be found [here](https://www.youtube.com/playlist?list=PLOeFnOV
 ### Behavioral Patterns
 
 - [Iterator](https://youtu.be/Gco6zF_ygSc)
+- [Chain of Responsibility](https://youtu.be/YQ03IyRu1Zo)

chain_of_responsibility/key_binds.linq

@@ -0,0 +1,78 @@
+<Query Kind="Program" />
+
+void Main()
+{
+	// select code in editor tab
+	var ide = new IDE(null);
+	var editor = new CodeEditor(ide);
+	var codeSelection = new CodeSelection(editor);
+	
+	codeSelection.HandleKey("Ctrl+F");
+	codeSelection.HandleKey("Alt+F4");
+}
+
+interface IKeyHandler
+{
+	void HandleKey(string key);
+}
+
+class IDE : IKeyHandler
+{
+	IKeyHandler _handler;
+
+	public IDE(IKeyHandler handler) => _handler = handler;
+
+	public void HandleKey(string key)
+	{
+		if (key == "Ctrl+F")
+		{
+			"Full Search".Dump();
+		}
+		else if (key == "Alt+F4")
+		{
+			"Close Application?".Dump();
+		}
+		else
+		{
+			_handler?.HandleKey(key);
+		}
+	}
+}
+
+class CodeEditor : IKeyHandler
+{
+	IKeyHandler _handler;
+
+	public CodeEditor(IKeyHandler handler) => _handler = handler;
+
+	public void HandleKey(string key)
+	{
+		if (key == "Ctrl+F")
+		{
+			"Local Search".Dump();
+		}
+		else
+		{
+			_handler?.HandleKey(key);
+		}
+	}
+}
+
+class CodeSelection : IKeyHandler
+{
+	IKeyHandler _handler;
+
+	public CodeSelection(IKeyHandler handler) => _handler = handler;
+
+	public void HandleKey(string key)
+	{
+		if (key == "Ctrl+F")
+		{
+			"Selection Search".Dump();
+		}
+		else
+		{
+			_handler?.HandleKey(key);
+		}
+	}
+}