Unity/airplane/Library/PackageCache/com.unity.timeline@1.6.4/Samples~/GameplaySequenceDemo/Info/Scripts/Editor

using UnityEngine;
using UnityEditor;
using System;

namespace Samples.GameplaySequence
{
[CustomEditor(typeof(Readme))]
public class ReadmeEditor : Editor
{
const float k_Space = 16f;

protected override void OnHeaderGUI()
{
var readme = (Readme)target;
Init();

float iconWidth = Mathf.Min(EditorGUIUtility.currentViewWidth / 3f - 20f, 128f);

GUILayout.BeginHorizontal("In BigTitle");
{
GUILayout.Label(readme.icon, GUILayout.Width(iconWidth), GUILayout.Height(iconWidth));
GUILayout.Label(readme.title, titleStyle);
}
GUILayout.EndHorizontal();
}

public override void OnInspectorGUI()
{
var readme = (Readme)target;
Init();

foreach (Readme.Section section in readme.sections)
{
if (!string.IsNullOrEmpty(section.heading))
{
GUILayout.Label(section.heading, headingStyle);
}

if (!string.IsNullOrEmpty(section.text))
{
GUILayout.Label(section.text, bodyStyle);
}

if (!string.IsNullOrEmpty(section.linkText))
{
if (LinkLabel(new GUIContent(section.linkText)))
{
Application.OpenURL(section.url);
}
}

GUILayout.Space(k_Space);
}
}

bool m_Initialized;

[SerializeField] GUIStyle m_TitleStyle;
[SerializeField] GUIStyle m_HeadingStyle;
[SerializeField] GUIStyle m_LinkStyle;
[SerializeField] GUIStyle m_BodyStyle;

GUIStyle linkStyle => m_LinkStyle;
GUIStyle titleStyle => m_TitleStyle;
GUIStyle headingStyle => m_HeadingStyle;
GUIStyle bodyStyle => m_BodyStyle;

void Init()
{
if (m_Initialized)
return;

m_BodyStyle = new GUIStyle(EditorStyles.label)
{
wordWrap = true,
fontSize = 14
};

m_TitleStyle = new GUIStyle(m_BodyStyle)
{
fontSize = 26
};

m_HeadingStyle = new GUIStyle(m_BodyStyle)
{
fontSize = 18
};

// Match selection color which works nicely for both light and dark skins
m_LinkStyle = new GUIStyle(m_BodyStyle)
{
wordWrap = false,
normal = { textColor = new Color(0x00 / 255f, 0x78 / 255f, 0xDA / 255f, 1f) },
stretchWidth = false
};

m_Initialized = true;
}

bool LinkLabel(GUIContent label, params GUILayoutOption[] options)
{
Rect position = GUILayoutUtility.GetRect(label, linkStyle, options);

Handles.BeginGUI();
Handles.color = linkStyle.normal.textColor;
Handles.DrawLine(new Vector3(position.xMin, position.yMax), new Vector3(position.xMax, position.yMax));
Handles.color = Color.white;
Handles.EndGUI();

EditorGUIUtility.AddCursorRect(position, MouseCursor.Link);

return GUI.Button(position, label, linkStyle);
}
}
}