protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (!IsPickingRegion)
{
return;
}
Region = new Rect(e.GetPosition(this), new Size(0, 0));
_cropAdorner = new CroppingAdorner(_mainCanvas, Region)
{
Fill = new SolidColorBrush(Color.FromArgb(30, 255, 255, 255))
};
_adornerLayer.Add(_cropAdorner);
CaptureMouse();
e.Handled = true;
base.OnMouseLeftButtonDown(e);
}
private void RemoveCropElements()
{
AdornerLayer aly = AdornerLayer.GetAdornerLayer(_currentElement);
aly.Remove(_cropAdorner);
_currentElement = null;
_cropAdorner.CropChanged -= CropChanged;
_cropAdorner = null;
}
private void AddCropToElement(FrameworkElement fel)
{
if (_currentElement != null)
{
RemoveCropElements();
}
var rcInterior = new Rect(
fel.Width * 0.2,
fel.Height * 0.2,
fel.Width * 0.6,
fel.Height * 0.6);
var aly = AdornerLayer.GetAdornerLayer(fel);
_cropAdorner = new CroppingAdorner(fel, rcInterior);
aly.Add(_cropAdorner);
_cropAdorner.CropChanged += CropChanged;
_currentElement = fel;
_cropAdorner.Fill = new SolidColorBrush(Color.FromArgb(110,0,0,0));
RefreshCropImage();
}