protected virtual void OnDesignerCanvasChanged(DesignerCanvas oldDesignerCanvas, DesignerCanvas newDesignerCanvas)
{
if (oldDesignerCanvas != null)
{
oldDesignerCanvas.LayoutUpdated -= DesignerCanvas_LayoutUpdated;
oldDesignerCanvas.MouseWheel -= DesignerCanvas_MouseWheel;
}
if (newDesignerCanvas != null)
{
newDesignerCanvas.LayoutUpdated += DesignerCanvas_LayoutUpdated;
newDesignerCanvas.MouseWheel += DesignerCanvas_MouseWheel;
newDesignerCanvas.LayoutTransform = _scaleTransform;
}
}
public RubberbandAdorner(DesignerCanvas designerCanvas, Point? dragStartPoint)
: base(designerCanvas)
{
_designerCanvas = designerCanvas;
_startPoint = dragStartPoint;
_adornerCanvas = new Canvas {Background = Brushes.Transparent};
_visuals = new VisualCollection(this) {_adornerCanvas};
var fillBrushColor = Colors.MediumBlue;
fillBrushColor.A = 48;
var fillBrush = new SolidColorBrush(fillBrushColor);
var strokeBrushColor = Colors.Navy;
strokeBrushColor.A = 64;
var strokeBrush = new SolidColorBrush(strokeBrushColor);
_rubberband = new Rectangle {Stroke = strokeBrush, StrokeThickness = 2, Fill = fillBrush};
_adornerCanvas.Children.Add(_rubberband);
}