Smrf.NodeXL.Visualization.Wpf.NodeXLControl.OnKeyDown C# (CSharp) Method

    OnKeyDown
    (
        System.Windows.Input.KeyEventArgs e
    )
    {
        AssertValid();

        if (this.IsLayingOutGraph)
        {
            return;
        }

        // Check for an arrow key.  An arrow key by itself moves the selected
        // vertices a small distance.  An arrow key combined with a shift key
        // moves them a larger distance.

        const Single SmallDistance = 1;
        const Single LargeDistance = 10;

        Single fMoveDistance =
            ( Keyboard.IsKeyDown(Key.LeftShift) ||
            Keyboard.IsKeyDown(Key.RightShift) ) ?
            LargeDistance : SmallDistance;

        Key eKey = e.Key;

        switch (eKey)
        {
            case Key.Left:

                MoveSelectedVertices(-fMoveDistance, 0);
                return;

            case Key.Right:

                MoveSelectedVertices(fMoveDistance, 0);
                return;

            case Key.Up:

                MoveSelectedVertices(0, -fMoveDistance);
                return;

            case Key.Down:

                MoveSelectedVertices(0, fMoveDistance);
                return;

            default:

                break;
        }

        base.OnKeyDown(e);
    }