private void AssociatedObjectOnMouseDown(object sender, MouseButtonEventArgs mouseButtonEventArgs)
{
// Si ya se está llevando a cabo una operación de arrastre, ¡huye!
if (_isDragging)
{
return;
}
if (PrimaryButtonState(mouseButtonEventArgs) == MouseButtonState.Pressed)
{
_dragStart = mouseButtonEventArgs.GetPosition(AssociatedObject);
_isDragging = true;
_adornerLayer = AdornerLayer.GetAdornerLayer(AssociatedObject);
if (_adornerLayer == null)
{
throw new NullReferenceException("No se ha podido obtener la Adorner Layer");
}
AssociatedObject.CaptureMouse();
_adorner = new SelectionAdorner(AssociatedObject)
{
Template = SelectionRectangleTemplate, Left = _dragStart.X, Top = _dragStart.Y
};
_adornerLayer.Add(_adorner);
}
}
/// <summary>
/// Handles changes to the Template property.
/// </summary>
private static void OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
SelectionAdorner target = (SelectionAdorner)d;
ControlTemplate oldTemplate = (ControlTemplate)e.OldValue;
ControlTemplate newTemplate = target.Template;
target.OnTemplateChanged(oldTemplate, newTemplate);
}
