DebugConsole.cs

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

public class DebugConsole : MonoBehaviour
{
	struct ConsoleMessage
	{
		public readonly string  message;
		public readonly string  stackTrace;
		public readonly LogType	type;
 
		public ConsoleMessage (string message, string stackTrace, LogType type)
		{
			this.message    = message;
			this.stackTrace	= stackTrace;
			this.type       = type;
		}
	}
	
	List<ConsoleMessage> entries = new List<ConsoleMessage>();
	Vector2 scrollPos;
	bool show;
	bool collapse;
	
	public GUISkin skin;
 
	// Visual elements:
 
	const int margin = 40;
	Rect windowRect = new Rect(margin, margin, Screen.width - (2 * margin), 400);
 
	void OnEnable  () 
	{ 
		Application.RegisterLogCallback(HandleLog);
	}
	void OnDisable () 
	{
		Application.RegisterLogCallback(null); 
	}
 
	void Update ()
	{
		if (Input.GetKeyDown(KeyCode.F4)||Input.GetKeyDown(KeyCode.K))
		{
			show = !show;
		}
	}
 
	void OnGUI ()
	{
		GUI.skin = skin;
		if (show) {
			windowRect = GUILayout.Window(123456, windowRect, ConsoleWindow, "Console");
		}
	}
	
	void ConsoleWindow (int windowID)
	{
		scrollPos = GUILayout.BeginScrollView(scrollPos);
			
		GUI.skin = null;
		for (int i = 0; i < entries.Count; i++) {
			ConsoleMessage entry = entries[i];
			
			if (collapse && i > 0 && entry.message == entries[i - 1].message) {
				continue;
			}
			
			switch (entry.type) 
			{
			case LogType.Error:
				GUI.contentColor = Color.red;
				break;
			case LogType.Exception:
				GUI.contentColor = Color.red;
				break;
			case LogType.Warning:
				GUI.contentColor = Color.yellow;
				break;
			default:
				GUI.contentColor = Color.white;
				break;
			}
			GUILayout.Label(entry.message);
		}
		
		GUI.contentColor = Color.white;
		
		GUI.skin = skin;
		
		GUILayout.EndScrollView();
		
		GUILayout.BeginHorizontal();
 
		// Clear button
		if (GUILayout.Button("Clear log", GUILayout.Width(100), GUILayout.Height(30))) {
			entries.Clear();
		}
		
		// Collapse toggle
        if (GUILayout.Button("Collapse", GUILayout.Width(100), GUILayout.Height(30)))
        {
            collapse = !collapse;
        }
		
		GUILayout.FlexibleSpace();
		
		if (GUILayout.Button("Close", GUILayout.Width(100), GUILayout.Height(30))) {
			show = false;
		}
 
		GUILayout.EndHorizontal();
 
		// Set the window to be draggable by the top title bar
		GUI.DragWindow(new Rect(0, 0, 10000, 20));
	}
	
	void HandleLog (string message, string stackTrace, LogType type)
	{
		ConsoleMessage entry = new ConsoleMessage(message, stackTrace, type);
		entries.Add(entry);
	}
}