TUM.CMS.VplControl.Core.VplControl.HandleMouseMove C# (CSharp) Method

        protected override void HandleMouseMove(object sender, MouseEventArgs e)
        {
            if (mouseMode == MouseMode.PreSelectionRectangle || mouseMode == MouseMode.SelectionRectangle)
            {
                if (e.LeftButton == MouseButtonState.Pressed)
                {
                    mouseMode = MouseMode.SelectionRectangle;

                    if (selectionRectangle == null)
                    {
                        selectionRectangle = new Border
                        {
                            // Move to WPF style
                            Background = Brushes.Transparent,
                            BorderBrush =
                                new SolidColorBrush(Application.Current.Resources["ColorBlue"] is Color
                                    ? (Color) Application.Current.Resources["ColorBlue"]
                                    : new Color()),
                            CornerRadius = new CornerRadius(5),
                            BorderThickness = new Thickness(2)
                        };

                        SetLeft(selectionRectangle, startSelectionRectanglePoint.X);
                        SetTop(selectionRectangle, startSelectionRectanglePoint.Y);

                        Children.Add(selectionRectangle);
                    }

                    var currentPosition = Mouse.GetPosition(this);
                    var delta = Point.Subtract(currentPosition, startSelectionRectanglePoint);

                    if (delta.X < 0)
                        SetLeft(selectionRectangle, currentPosition.X);

                    if (delta.Y < 0)
                        SetTop(selectionRectangle, currentPosition.Y);

                    selectionRectangle.Width = Math.Abs(delta.X);
                    selectionRectangle.Height = Math.Abs(delta.Y);

                    foreach (var node in NodeCollection)
                    {
                        SelectedNodes.Remove(node);

                        if (node.Left >= GetLeft(selectionRectangle) &&
                            node.Left + node.ActualWidth <= GetLeft(selectionRectangle) + selectionRectangle.Width &&
                            node.Top >= GetTop(selectionRectangle) &&
                            node.Top + node.ActualHeight <= GetTop(selectionRectangle) + selectionRectangle.Height)
                        {
                            node.IsSelected = true;
                            SelectedNodes.Add(node);
                        }
                        else
                            node.IsSelected = false;
                    }
                }
            }
            else if (mouseMode == MouseMode.Panning)
            {
                var v = start - e.GetPosition(this);

                TranslateTransform.X = origin.X - v.X;
                TranslateTransform.Y = origin.Y - v.Y;
            }


            switch (SplineMode)
            {
                case SplineModes.Nothing:
                    ClearTempLine();
                    break;
                case SplineModes.First:
                    break;
                case SplineModes.Second:
                    if (TempLine == null)
                    {
                        TempLine = new Line {Style = FindResource("VplLineStyle") as Style};
                        Children.Add(TempLine);
                    }

                    TempLine.X1 = TempStartPort.Origin.X;
                    TempLine.Y1 = TempStartPort.Origin.Y;
                    TempLine.X2 = Mouse.GetPosition(this).X;
                    TempLine.Y2 = Mouse.GetPosition(this).Y;

                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }