mapbox-sdk/Unity/Editor/PropertyDrawers/MapExtentOptionsDrawer.cs

namespace Mapbox.Editor
{
	using UnityEditor;
	using UnityEngine;
	using Mapbox.Unity.Map;
	using Mapbox.VectorTile.ExtensionMethods;

	[CustomPropertyDrawer(typeof(MapExtentOptions))]
	public class MapExtentOptionsDrawer : PropertyDrawer
	{
		static string extTypePropertyName = "extentType";
		static float _lineHeight = EditorGUIUtility.singleLineHeight;
		GUIContent[] extentTypeContent;
		bool isGUIContentSet = false;
		public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
		{
			var kindProperty = property.FindPropertyRelative(extTypePropertyName);
			var displayNames = kindProperty.enumDisplayNames;
			int count = kindProperty.enumDisplayNames.Length;
			if (!isGUIContentSet)
			{
				extentTypeContent = new GUIContent[count];
				for (int extIdx = 0; extIdx < count; extIdx++)
				{
					extentTypeContent[extIdx] = new GUIContent
					{
						text = displayNames[extIdx],
						tooltip = EnumExtensions.Description((MapExtentType)extIdx),
					};
				}
				isGUIContentSet = true;
			}
			// Draw label.
			var extentTypeLabel = new GUIContent
			{
				text = label.text,
				tooltip = "Options to determine the geographic extent of the world for which the map tiles will be requested.",
			};
			EditorGUI.BeginChangeCheck();
			kindProperty.enumValueIndex = EditorGUILayout.Popup(extentTypeLabel, kindProperty.enumValueIndex, extentTypeContent, GUILayout.Height(_lineHeight));

			var kind = (MapExtentType)kindProperty.enumValueIndex;
			if (EditorGUI.EndChangeCheck())
			{
				EditorHelper.CheckForModifiedProperty(property);
			}

			EditorGUI.indentLevel++;

			GUILayout.Space(-_lineHeight);
			SerializedProperty defaultExtentsProp = property.FindPropertyRelative("defaultExtents");
			EditorGUI.BeginChangeCheck();

			switch (kind)
			{
				case MapExtentType.CameraBounds:
					GUILayout.Space(_lineHeight);
					EditorGUILayout.PropertyField(defaultExtentsProp.FindPropertyRelative("cameraBoundsOptions"), new GUIContent { text = "CameraOptions-" });
					break;
				case MapExtentType.RangeAroundCenter:
					EditorGUILayout.PropertyField(defaultExtentsProp.FindPropertyRelative("rangeAroundCenterOptions"), new GUIContent { text = "RangeAroundCenter" });
					break;
				case MapExtentType.RangeAroundTransform:
					GUILayout.Space(_lineHeight);
					EditorGUILayout.PropertyField(defaultExtentsProp.FindPropertyRelative("rangeAroundTransformOptions"), new GUIContent { text = "RangeAroundTransform" });
					break;
				default:
					break;
			}
			if (EditorGUI.EndChangeCheck())
			{
				EditorHelper.CheckForModifiedProperty(defaultExtentsProp);
			}
			EditorGUI.indentLevel--;
		}
	}
}