SourceGrid.Selection.SelectionBase.Focus C# (CSharp) Метод

        public bool Focus(Position pCellToActivate, bool pResetSelection)
        {
            //If control key is pressed, enableMultiSelection is true and the cell that will receive the focus is not empty leave the cell selected otherwise deselect other cells
            bool deselectOtherCells = false;
            if (pCellToActivate.IsEmpty() == false && pResetSelection)
                deselectOtherCells = true;

            pCellToActivate = Grid.PositionToStartPosition(pCellToActivate);

            //Check to see if the value is changed (note that I use the internal variable to see the actual stored value)
            if (pCellToActivate != ActivePosition)
            {
                //GotFocus Event Arguments
                Cells.ICellVirtual newCellToFocus = Grid.GetCell(pCellToActivate);
                CellContext newCellContext = new CellContext(Grid, pCellToActivate, newCellToFocus);
                ChangeActivePositionEventArgs gotFocusEventArgs = new ChangeActivePositionEventArgs(ActivePosition, pCellToActivate);

                if (newCellToFocus != null)
                {
                    //Cell Focus Entering
                    Grid.Controller.OnFocusEntering(newCellContext, gotFocusEventArgs);
                    if (gotFocusEventArgs.Cancel)
                        return false;

                    //If the cell can't receive the focus stop the focus operation
                    if (Grid.Controller.CanReceiveFocus(newCellContext, gotFocusEventArgs) == false)
                        return false;
                }

                //If the new cell is valid I check if I can move the focus inside the grid
                if (newCellToFocus != null)
                {
                    //This method cause any cell editor to leave the focus if the validation is ok, otherwise returns false.
                    // This is useful for 2 reason:
                    //	-To validate the editor
                    //	-To check if I can move the focus on another cell
                    bool canFocus = Grid.Focus();
                    if (canFocus == false)
                        return false;
                }

                //If there is a cell with the focus fire the focus leave events
                if (IsActivePositionValid())
                {
                    //LostFocus Event Arguments
                    Cells.ICellVirtual oldCellFocus = Grid.GetCell(ActivePosition);
                    CellContext oldCellContext = new CellContext(Grid, ActivePosition, oldCellFocus);
                    ChangeActivePositionEventArgs lostFocusEventArgs = new ChangeActivePositionEventArgs(ActivePosition, pCellToActivate);

                    //Cell Focus Leaving
                    Grid.Controller.OnFocusLeaving(oldCellContext, lostFocusEventArgs);
                    if (lostFocusEventArgs.Cancel)
                        return false;

                    //Cell Lost Focus
                    OnCellLostFocus(lostFocusEventArgs);
                    if (lostFocusEventArgs.Cancel)
                        return false;
                }
                else
                {
                    //Reset anyway the actual value. This can happen when there is an ActivePosition but it is not more valid (outside the valid range maybe when removing some cells)
                    // NOTE: in this case the focus event are not executed
                    m_ActivePosition = Position.Empty;
                }

                //Deselect previous selected cells
                if (deselectOtherCells)
                    ResetSelection(false);

                bool success;
                if (newCellToFocus != null)
                {
                    //Cell Got Focus
                    OnCellGotFocus(gotFocusEventArgs);

                    success = (!gotFocusEventArgs.Cancel);
                }
                else
                {
                    success = true;
                }

                //Fire a change event
                OnSelectionChanged(EventArgs.Empty);

                return success;
            }
            else
            {
                if (pCellToActivate.IsEmpty() == false)
                {
                    //I check if the grid still has the focus, otherwise I force it
                    if (Grid.ContainsFocus)
                        return true;
                    else
                        return Grid.Focus();
                }
                else
                    return true;
            }
        }