UnityEditor.ASHistoryFileView.AssetViewKeyboard C# (CSharp) Method

        private void AssetViewKeyboard()
        {
            switch (Event.current.keyCode)
            {
                case KeyCode.KeypadEnter:
                case KeyCode.Return:
                    if (Application.platform == RuntimePlatform.WindowsEditor)
                    {
                        this.OpenAssetSelection();
                        GUIUtility.ExitGUI();
                    }
                    break;

                case KeyCode.UpArrow:
                {
                    Event.current.Use();
                    HierarchyProperty firstSelected = this.GetFirstSelected();
                    if (firstSelected != null)
                    {
                        if (firstSelected.instanceID != this.GetFirst().instanceID)
                        {
                            if (firstSelected.Previous(this.m_ExpandedArray))
                            {
                                Object pptrValue = firstSelected.pptrValue;
                                this.SelectionClick(firstSelected);
                                this.FrameObject(pptrValue);
                            }
                        }
                        else
                        {
                            this.SelType = SelectionType.All;
                            Selection.objects = new Object[0];
                            this.ScrollTo(0f);
                        }
                    }
                    break;
                }
                case KeyCode.DownArrow:
                {
                    Event.current.Use();
                    HierarchyProperty lastSelected = this.GetLastSelected();
                    if ((Application.platform != RuntimePlatform.OSXEditor) || !Event.current.command)
                    {
                        if (lastSelected != null)
                        {
                            if (lastSelected.instanceID == this.GetLast().instanceID)
                            {
                                this.SelType = SelectionType.DeletedItemsRoot;
                                Selection.objects = new Object[0];
                                this.ScrollToDeletedItem(-1);
                            }
                            else if (lastSelected.Next(this.m_ExpandedArray))
                            {
                                Object target = lastSelected.pptrValue;
                                this.SelectionClick(lastSelected);
                                this.FrameObject(target);
                            }
                        }
                    }
                    else
                    {
                        this.OpenAssetSelection();
                        GUIUtility.ExitGUI();
                    }
                    break;
                }
                case KeyCode.RightArrow:
                {
                    HierarchyProperty activeSelected = this.GetActiveSelected();
                    if (activeSelected != null)
                    {
                        this.SetExpanded(activeSelected.instanceID, true);
                    }
                    break;
                }
                case KeyCode.LeftArrow:
                {
                    HierarchyProperty property = this.GetActiveSelected();
                    if (property != null)
                    {
                        this.SetExpanded(property.instanceID, false);
                    }
                    break;
                }
                case KeyCode.Home:
                    if (this.GetFirst() != null)
                    {
                        Selection.activeObject = this.GetFirst().pptrValue;
                        this.FrameObject(Selection.activeObject);
                    }
                    break;

                case KeyCode.End:
                    if (this.GetLast() != null)
                    {
                        Selection.activeObject = this.GetLast().pptrValue;
                        this.FrameObject(Selection.activeObject);
                    }
                    break;

                case KeyCode.PageUp:
                {
                    Event.current.Use();
                    if (OSX)
                    {
                        this.m_ScrollPosition.y -= this.m_ScreenRect.height;
                        if (this.m_ScrollPosition.y < 0f)
                        {
                            this.m_ScrollPosition.y = 0f;
                        }
                        break;
                    }
                    HierarchyProperty first = this.GetFirstSelected();
                    if (first == null)
                    {
                        if (this.GetFirst() != null)
                        {
                            Selection.activeObject = this.GetFirst().pptrValue;
                            this.FrameObject(Selection.activeObject);
                        }
                        break;
                    }
                    for (int i = 0; i < (this.m_ScreenRect.height / m_RowHeight); i++)
                    {
                        if (!first.Previous(this.m_ExpandedArray))
                        {
                            first = this.GetFirst();
                            break;
                        }
                    }
                    Object obj4 = first.pptrValue;
                    this.SelectionClick(first);
                    this.FrameObject(obj4);
                    break;
                }
                case KeyCode.PageDown:
                    Event.current.Use();
                    if (!OSX)
                    {
                        HierarchyProperty last = this.GetLastSelected();
                        if (last == null)
                        {
                            if (this.GetLast() != null)
                            {
                                Selection.activeObject = this.GetLast().pptrValue;
                                this.FrameObject(Selection.activeObject);
                            }
                            break;
                        }
                        for (int j = 0; j < (this.m_ScreenRect.height / m_RowHeight); j++)
                        {
                            if (!last.Next(this.m_ExpandedArray))
                            {
                                last = this.GetLast();
                                break;
                            }
                        }
                        Object obj5 = last.pptrValue;
                        this.SelectionClick(last);
                        this.FrameObject(obj5);
                        break;
                    }
                    this.m_ScrollPosition.y += this.m_ScreenRect.height;
                    break;

                default:
                    return;
            }
            Event.current.Use();
        }