UnityEditor.HandleUtility.PickRectObjects C# (CSharp) Method

        public static GameObject[] PickRectObjects(Rect rect)
        {
            return PickRectObjects(rect, true);
        }

        public void OnGUI()
        {
            Event current = Event.current;

            Handles.BeginGUI();
            Vector2   mousePosition  = current.mousePosition;
            int       controlID      = s_RectSelectionID;
            EventType typeForControl = current.GetTypeForControl(controlID);

            switch (typeForControl)
            {
            case EventType.MouseDown:
                if ((HandleUtility.nearestControl == controlID) && (current.button == 0))
                {
                    GUIUtility.hotControl   = controlID;
                    this.m_SelectStartPoint = mousePosition;
                    this.m_SelectionStart   = Selection.objects;
                    this.m_RectSelecting    = false;
                }
                goto Label_04F7;

            case EventType.MouseUp:
                if ((GUIUtility.hotControl == controlID) && (current.button == 0))
                {
                    GUIUtility.hotControl = 0;
                    if (!this.m_RectSelecting)
                    {
                        if (current.shift || EditorGUI.actionKey)
                        {
                            GameObject obj5 = HandleUtility.PickGameObject(current.mousePosition, false);
                            if (!EditorGUI.actionKey ? (Selection.activeGameObject == obj5) : Selection.gameObjects.Contains <GameObject>(obj5))
                            {
                                UpdateSelection(this.m_SelectionStart, obj5, SelectionType.Subtractive, this.m_RectSelecting);
                            }
                            else
                            {
                                UpdateSelection(this.m_SelectionStart, HandleUtility.PickGameObject(current.mousePosition, true), SelectionType.Additive, this.m_RectSelecting);
                            }
                        }
                        else
                        {
                            GameObject newObject = SceneViewPicking.PickGameObject(current.mousePosition);
                            UpdateSelection(this.m_SelectionStart, newObject, SelectionType.Normal, this.m_RectSelecting);
                        }
                        current.Use();
                    }
                    else
                    {
                        EditorApplication.modifierKeysChanged = (EditorApplication.CallbackFunction)Delegate.Remove(EditorApplication.modifierKeysChanged, new EditorApplication.CallbackFunction(this.SendCommandsOnModifierKeys));
                        this.m_RectSelecting  = false;
                        this.m_SelectionStart = new UnityEngine.Object[0];
                        current.Use();
                    }
                }
                goto Label_04F7;

            case EventType.MouseDrag:
                if (GUIUtility.hotControl != controlID)
                {
                    goto Label_04F7;
                }
                if (!this.m_RectSelecting)
                {
                    Vector2 vector2 = mousePosition - this.m_SelectStartPoint;
                    if (vector2.magnitude > 6f)
                    {
                        EditorApplication.modifierKeysChanged = (EditorApplication.CallbackFunction)Delegate.Combine(EditorApplication.modifierKeysChanged, new EditorApplication.CallbackFunction(this.SendCommandsOnModifierKeys));
                        this.m_RectSelecting    = true;
                        this.m_LastSelection    = null;
                        this.m_CurrentSelection = null;
                    }
                }
                if (this.m_RectSelecting)
                {
                    float x = Mathf.Max(mousePosition.x, 0f);
                    this.m_SelectMousePoint = new Vector2(x, Mathf.Max(mousePosition.y, 0f));
                    GameObject[] newObjects = HandleUtility.PickRectObjects(EditorGUIExt.FromToRect(this.m_SelectStartPoint, this.m_SelectMousePoint));
                    this.m_CurrentSelection = newObjects;
                    bool flag = false;
                    if (this.m_LastSelection == null)
                    {
                        this.m_LastSelection = new Dictionary <GameObject, bool>();
                        flag = true;
                    }
                    flag |= this.m_LastSelection.Count != newObjects.Length;
                    if (!flag)
                    {
                        Dictionary <GameObject, bool> dictionary = new Dictionary <GameObject, bool>(newObjects.Length);
                        foreach (GameObject obj2 in newObjects)
                        {
                            dictionary.Add(obj2, false);
                        }
                        foreach (GameObject obj3 in this.m_LastSelection.Keys)
                        {
                            if (!dictionary.ContainsKey(obj3))
                            {
                                flag = true;
                                break;
                            }
                        }
                    }
                    if (flag)
                    {
                        this.m_LastSelection = new Dictionary <GameObject, bool>(newObjects.Length);
                        foreach (GameObject obj4 in newObjects)
                        {
                            this.m_LastSelection.Add(obj4, false);
                        }
                        if (newObjects != null)
                        {
                            if (current.shift)
                            {
                                UpdateSelection(this.m_SelectionStart, newObjects, SelectionType.Additive, this.m_RectSelecting);
                            }
                            else if (EditorGUI.actionKey)
                            {
                                UpdateSelection(this.m_SelectionStart, newObjects, SelectionType.Subtractive, this.m_RectSelecting);
                            }
                            else
                            {
                                UpdateSelection(this.m_SelectionStart, newObjects, SelectionType.Normal, this.m_RectSelecting);
                            }
                        }
                    }
                }
                break;

            case EventType.Repaint:
                if ((GUIUtility.hotControl == controlID) && this.m_RectSelecting)
                {
                    EditorStyles.selectionRect.Draw(EditorGUIExt.FromToRect(this.m_SelectStartPoint, this.m_SelectMousePoint), GUIContent.none, false, false, false, false);
                }
                goto Label_04F7;

            case EventType.Layout:
                if (!Tools.viewToolActive)
                {
                    HandleUtility.AddDefaultControl(controlID);
                }
                goto Label_04F7;

            default:
                if ((typeForControl == EventType.ExecuteCommand) && ((controlID == GUIUtility.hotControl) && (current.commandName == "ModifierKeysChanged")))
                {
                    if (current.shift)
                    {
                        UpdateSelection(this.m_SelectionStart, this.m_CurrentSelection, SelectionType.Additive, this.m_RectSelecting);
                    }
                    else if (EditorGUI.actionKey)
                    {
                        UpdateSelection(this.m_SelectionStart, this.m_CurrentSelection, SelectionType.Subtractive, this.m_RectSelecting);
                    }
                    else
                    {
                        UpdateSelection(this.m_SelectionStart, this.m_CurrentSelection, SelectionType.Normal, this.m_RectSelecting);
                    }
                    current.Use();
                }
                goto Label_04F7;
            }
            current.Use();
Label_04F7:
            Handles.EndGUI();
        }