private static void CreateDragAdorner()
{
var template = GetDragAdornerTemplate(_dragInfo.VisualSource);
var templateSelector = GetDragAdornerTemplateSelector(_dragInfo.VisualSource);
UIElement adornment = null;
var useDefaultDragAdorner = GetUseDefaultDragAdorner(_dragInfo.VisualSource);
if (template == null && templateSelector == null && useDefaultDragAdorner)
{
template = new DataTemplate();
var factory = new FrameworkElementFactory(typeof(Image));
var bs = _dragInfo.VisualSourceItem.RenderToBitmap(_dragInfo.VisualSourceFlowDirection);
factory.SetValue(Image.SourceProperty, bs);
factory.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
factory.SetValue(RenderOptions.BitmapScalingModeProperty, BitmapScalingMode.HighQuality);
if (_dragInfo.VisualSourceItem is FrameworkElement)
{
factory.SetValue(FrameworkElement.WidthProperty, ((FrameworkElement)_dragInfo.VisualSourceItem).ActualWidth);
factory.SetValue(FrameworkElement.HeightProperty, ((FrameworkElement)_dragInfo.VisualSourceItem).ActualHeight);
factory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Left);
factory.SetValue(FrameworkElement.VerticalAlignmentProperty, VerticalAlignment.Top);
}
template.VisualTree = factory;
}
if (template != null || templateSelector != null)
{
if (_dragInfo.Data is IEnumerable && !(_dragInfo.Data is string))
{
if (((IEnumerable)_dragInfo.Data).Cast<object>().Count() <= 10)
{
var itemsControl = new ItemsControl();
itemsControl.ItemsSource = (IEnumerable)_dragInfo.Data;
itemsControl.ItemTemplate = template;
itemsControl.ItemTemplateSelector = templateSelector;
// The ItemsControl doesn't display unless we create a border to contain it.
// Not quite sure why this is...
var border = new Border();
border.Child = itemsControl;
adornment = border;
}
}
else
{
var contentPresenter = new ContentPresenter();
contentPresenter.Content = _dragInfo.Data;
contentPresenter.ContentTemplate = template;
contentPresenter.ContentTemplateSelector = templateSelector;
adornment = contentPresenter;
}
}
if (adornment != null)
{
if (useDefaultDragAdorner)
{
adornment.Opacity = GetDefaultDragAdornerOpacity(_dragInfo.VisualSource);
}
var parentWindow = _dragInfo.VisualSource.FindVisualParent<Window>();
var rootElement = parentWindow != null ? parentWindow.Content as UIElement : null;
if (rootElement == null && Application.Current != null && Application.Current.MainWindow != null)
{
rootElement = (UIElement)Application.Current.MainWindow.Content;
}
if (rootElement == null)
{
rootElement = _dragInfo.VisualSource.FindVisualParent<UserControl>();
}
DragAdorner = new DragAdorner(rootElement, adornment);
}
}
private static void CreateEffectAdorner(DropInfo dropInfo)
{
var template = GetEffectAdornerTemplate(dropInfo.VisualTarget, dropInfo.AllowedEffects, dropInfo.DestinationText);
if (template != null)
{
var rootElement = (UIElement)Application.Current.MainWindow.Content;
UIElement adornment = null;
var contentPresenter = new ContentPresenter();
contentPresenter.Content = _dragInfo.Data;
contentPresenter.ContentTemplate = template;
adornment = contentPresenter;
EffectAdorner = new DragAdorner(rootElement, adornment);
}
}
