ColorToCSharp.cs

using UnityEngine;
using UnityEditor;
using System;
using System.Collections;
using System.Collections.Generic;

public class ColorToCSharp : EditorWindow
{
	[SerializeField]
	private bool _usedColorPickerOnce = false;

	[SerializeField]
	private Color _color = Color.white;
	protected Color color
	{
		get
		{
			if (!_usedColorPickerOnce)
			{
				return Color.white;
			}

			return _color;
		}
		set
		{
			if (!_usedColorPickerOnce && value == Color.white)
			{
				return;
			}

			if (_usedColorPickerOnce && value == _color)
			{
				return;
			}

			_color = value;
			_usedColorPickerOnce = true;

			EditorGUIUtility.systemCopyBuffer = GetColorString();
		}
	}

	// ================================================================================
	//  creating the window
	// --------------------------------------------------------------------------------

	[MenuItem("Window/Color To C#")]
	private static void LevelEditorWindow()
	{
		EditorWindow window = EditorWindow.GetWindow(typeof(ColorToCSharp));
		window.titleContent = new GUIContent("Color to C#");
	}

	// ================================================================================
	//  unity methods
	// -------------------------------------------------------------------------------   

	private void OnGUI()
	{
		EditorGUILayout.Space();

		color = EditorGUILayout.ColorField("Color", color);

		EditorGUILayout.Space();

		string colorLabel;
		string alternativeColorLabel;
		if (!_usedColorPickerOnce)
		{
			GUI.enabled = false;
			colorLabel = "";
			alternativeColorLabel = "";
		}
		else
		{
			colorLabel = GetColorString();
			alternativeColorLabel = GetColor32String();
		}

		GUILayout.BeginHorizontal();
		EditorGUILayout.TextField(colorLabel);
		GUILayout.Space(5f);
		if (GUILayout.Button("Copy"))
		{
			EditorGUIUtility.systemCopyBuffer = GetColorString();
		}
		GUILayout.EndHorizontal();
		GUILayout.BeginHorizontal();
		EditorGUILayout.TextField(alternativeColorLabel);
		GUILayout.Space(5f);
		if (GUILayout.Button("Copy"))
		{
			EditorGUIUtility.systemCopyBuffer = GetColor32String();
		}
		GUILayout.EndHorizontal();

		GUI.enabled = true;

		EditorGUILayout.Space();

		if (_usedColorPickerOnce)
		{
			EditorGUILayout.LabelField("Copied to System Clipboard.");
		}
		else
		{
			EditorGUILayout.LabelField("Select a color.");
		}
	}

	// ================================================================================
	//  private methods
	// --------------------------------------------------------------------------------

	private string GetColorString()
	{
		return "new Color(" + color.r + "f," + color.g + "f," + color.b + "f," + color.a + "f)";
	}

	private string GetColor32String()
	{
		Color32 color32 = (Color32)color;
		return "new Color32(" + color32.r + "," + color32.g + "," + color32.b +"," + color32.a + ")";
	}
}