Xceed.Wpf.Toolkit.AutoSelectTextBox.MoveFocusLeft C# (CSharp) Méthode

    private bool MoveFocusLeft()
    {
      if( this.FlowDirection == FlowDirection.LeftToRight )
      {
        //occurs only if the cursor is at the beginning of the text
        if( ( this.CaretIndex == 0 ) && ( this.SelectionLength == 0 ) )
        {
          if( ComponentCommands.MoveFocusBack.CanExecute( null, this ) )
          {
            ComponentCommands.MoveFocusBack.Execute( null, this );
            return true;
          }
          else if( this.CanMoveFocus( FocusNavigationDirection.Left, false ) )
          {
            this.MoveFocus( new TraversalRequest( FocusNavigationDirection.Left ) );
            return true;
          }
        }
      }
      else
      {
        //occurs only if the cursor is at the end of the text
        if( ( this.CaretIndex == this.Text.Length ) && ( this.SelectionLength == 0 ) )
        {
          if( ComponentCommands.MoveFocusBack.CanExecute( null, this ) )
          {
            ComponentCommands.MoveFocusBack.Execute( null, this );
            return true;
          }
          else if( this.CanMoveFocus( FocusNavigationDirection.Left, false ) )
          {
            this.MoveFocus( new TraversalRequest( FocusNavigationDirection.Left ) );
            return true;
          }
        }
      }

      return false;
    }