UnityEditor.SplitterGUILayout.BeginVerticalSplit C# (CSharp) Method

        public static void BeginVerticalSplit(SplitterState state, params GUILayoutOption[] options)
        {
            BeginSplit(state, GUIStyle.none, true, options);
        }

        void LayoutWithStripsOnTop(List <AudioMixerGroupController> allGroups, Dictionary <AudioMixerEffectController, AudioMixerGroupController> effectMap)
        {
            // Do layouting
            SplitterState horizontalState = m_LayoutStripsOnTop.m_HorizontalSplitter;
            SplitterState verticalState   = m_LayoutStripsOnTop.m_VerticalSplitter;

            SplitterGUILayout.BeginVerticalSplit(verticalState, GUILayout.ExpandWidth(true), GUILayout.ExpandHeight(true));
            if (m_GroupsRenderedAboveSections)
            {
                GUILayout.BeginVertical();
                GUILayout.EndVertical();
            }
            SplitterGUILayout.BeginHorizontalSplit(horizontalState, GUILayout.ExpandWidth(true), GUILayout.ExpandHeight(true));
            if (!m_GroupsRenderedAboveSections)
            {
                GUILayout.BeginVertical();
                GUILayout.EndVertical();
            }
            SplitterGUILayout.EndHorizontalSplit();
            SplitterGUILayout.EndVerticalSplit();

            float channelStripYPos   = m_GroupsRenderedAboveSections ? EditorGUI.kWindowToolbarHeight : EditorGUI.kWindowToolbarHeight + verticalState.realSizes[0];
            float channelStripHeight = m_GroupsRenderedAboveSections ? verticalState.realSizes[0] : verticalState.realSizes[1];

            float sectionsYPos   = !m_GroupsRenderedAboveSections ? EditorGUI.kWindowToolbarHeight : EditorGUI.kWindowToolbarHeight + verticalState.realSizes[0];
            float sectionsHeight = !m_GroupsRenderedAboveSections ? verticalState.realSizes[0] : verticalState.realSizes[1];

            Rect channelStripViewRect = new Rect(0, channelStripYPos, position.width, channelStripHeight);
            Rect totalRectOfSections  = new Rect(0, channelStripViewRect.yMax, position.width, position.height - channelStripViewRect.height);

            // Rects for sections
            Rect[]      sectionRects    = new Rect[m_SectionOrder.Length];
            const float spaceFromBottom = 12f;

            for (int i = 0; i < sectionRects.Length; i++)
            {
                float xPos = (i > 0) ? sectionRects[i - 1].xMax : 0f;
                sectionRects[i] = new Rect(xPos, sectionsYPos, horizontalState.realSizes[i], sectionsHeight - spaceFromBottom);
            }

            // Spacing between lists
            const float halfSpaceBetween = 4f;

            sectionRects[0].x     += 2 * halfSpaceBetween;
            sectionRects[0].width -= 3 * halfSpaceBetween;
            sectionRects[sectionRects.Length - 1].x     += halfSpaceBetween;
            sectionRects[sectionRects.Length - 1].width -= 3 * halfSpaceBetween;
            for (int i = 1; i < sectionRects.Length - 1; i++)
            {
                sectionRects[i].x     += halfSpaceBetween;
                sectionRects[i].width -= halfSpaceBetween * 2;
            }

            // Do content
            DoSections(totalRectOfSections, sectionRects, m_SectionOrder);
            m_ChannelStripView.OnGUI(channelStripViewRect, m_ShowReferencedBuses, m_ShowBusConnections, m_ShowBusConnectionsOfSelection, allGroups, effectMap, m_SortGroupsAlphabetically, m_ShowDeveloperOverlays, m_GroupTree.ScrollToItem);

            // Horizontal line (split)
            EditorGUI.DrawRect(new Rect(0, EditorGUI.kWindowToolbarHeight + verticalState.realSizes[0] - 1, position.width, 1), new Color(0f, 0f, 0f, 0.4f));
        }