UnityEditor.Editor.DrawHeaderGUI C# (CSharp) Method

        internal static Rect DrawHeaderGUI(Editor editor, string header, float leftMargin)
        {
            if (s_Styles == null)
            {
                s_Styles = new Styles();
            }
            GUILayout.BeginHorizontal(s_Styles.inspectorBig, new GUILayoutOption[0]);
            GUILayout.Space(38f);
            GUILayout.BeginVertical(new GUILayoutOption[0]);
            GUILayout.Space(19f);
            GUILayout.BeginHorizontal(new GUILayoutOption[0]);
            if (leftMargin > 0f)
            {
                GUILayout.Space(leftMargin);
            }
            if (editor != null)
            {
                editor.OnHeaderControlsGUI();
            }
            else
            {
                EditorGUILayout.GetControlRect(new GUILayoutOption[0]);
            }
            GUILayout.EndHorizontal();
            GUILayout.EndVertical();
            GUILayout.EndHorizontal();
            Rect lastRect = GUILayoutUtility.GetLastRect();
            Rect r = new Rect(lastRect.x + leftMargin, lastRect.y, lastRect.width - leftMargin, lastRect.height);
            Rect iconRect = new Rect(r.x + 6f, r.y + 6f, 32f, 32f);
            if (editor != null)
            {
                editor.OnHeaderIconGUI(iconRect);
            }
            else
            {
                GUI.Label(iconRect, AssetPreview.GetMiniTypeThumbnail(typeof(Object)), s_Styles.centerStyle);
            }
            Rect titleRect = new Rect(r.x + 44f, r.y + 6f, ((r.width - 44f) - 38f) - 4f, 16f);
            if (editor != null)
            {
                editor.OnHeaderTitleGUI(titleRect, header);
            }
            else
            {
                GUI.Label(titleRect, header, EditorStyles.largeLabel);
            }
            if (editor != null)
            {
                editor.DrawHeaderHelpAndSettingsGUI(r);
            }
            Event current = Event.current;
            if (((editor != null) && (current.type == EventType.MouseDown)) && ((current.button == 1) && r.Contains(current.mousePosition)))
            {
                EditorUtility.DisplayObjectContextMenu(new Rect(current.mousePosition.x, current.mousePosition.y, 0f, 0f), editor.targets, 0);
                current.Use();
            }
            return lastRect;
        }

        public static void DrawFoldoutInspector(UnityObject target, ref Editor editor)
        {
            if (editor != null && (editor.target != target || target == null))
            {
                UnityObject.DestroyImmediate(editor);
                editor = null;
            }

            if (editor == null && target != null)
                editor = Editor.CreateEditor(target);

            if (editor == null)
                return;

            const float kSpaceForFoldoutArrow = 10f;
            Rect titleRect = Editor.DrawHeaderGUI(editor, editor.targetTitle, kSpaceForFoldoutArrow);
            int id = GUIUtility.GetControlID(45678, FocusType.Passive);

            Rect renderRect = EditorGUI.GetInspectorTitleBarObjectFoldoutRenderRect(titleRect);
            renderRect.y = titleRect.yMax - 17f; // align with bottom
            bool oldVisible = UnityEditorInternal.InternalEditorUtility.GetIsInspectorExpanded(target);
            bool newVisible = EditorGUI.DoObjectFoldout(oldVisible, titleRect, renderRect, editor.targets, id);

            if (newVisible != oldVisible)
                UnityEditorInternal.InternalEditorUtility.SetIsInspectorExpanded(target, newVisible);

            if (newVisible)
                editor.OnInspectorGUI();
        }