protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
DragObject dragObject = e.Data.GetData(typeof(DragObject)) as DragObject;
if (dragObject != null && !String.IsNullOrEmpty(dragObject.Xaml))
{
DesignerItem newItem = null;
Object content = XamlReader.Load(XmlReader.Create(new StringReader(dragObject.Xaml)));
if (content != null)
{
newItem = new DesignerItem();
newItem.Content = content;
Point position = e.GetPosition(this);
if (dragObject.DesiredSize.HasValue)
{
Size desiredSize = dragObject.DesiredSize.Value;
newItem.Width = desiredSize.Width;
newItem.Height = desiredSize.Height;
DesignerCanvas.SetLeft(newItem, Math.Max(0, position.X - newItem.Width / 2));
DesignerCanvas.SetTop(newItem, Math.Max(0, position.Y - newItem.Height / 2));
}
else
{
DesignerCanvas.SetLeft(newItem, Math.Max(0, position.X));
DesignerCanvas.SetTop(newItem, Math.Max(0, position.Y));
}
this.Children.Add(newItem);
//update selection
foreach (ISelectable item in this.SelectedItems)
{
item.IsSelected = false;
}
SelectedItems.Clear();
newItem.IsSelected = true;
this.SelectedItems.Add(newItem);
}
e.Handled = true;
}
}
void DesignerItem_Loaded(object sender, RoutedEventArgs e)
{
// if DragThumbTemplate and ConnectorDecoratorTemplate properties of this class
// are set these templates are applied;
// Note: this method is only executed when the Loaded event is fired, so
// setting DragThumbTemplate or ConnectorDecoratorTemplate properties after
// will have no effect.
if (Template != null)
{
ContentPresenter contentPresenter = Template.FindName("PART_ContentPresenter", this) as ContentPresenter;
if (contentPresenter != null)
{
UIElement contentVisual = VisualTreeHelper.GetChild(contentPresenter, 0) as UIElement;
if (contentVisual != null)
{
DragThumb thumb = Template.FindName("PART_DragThumb", this) as DragThumb;
Control connectorDecorator = Template.FindName("PART_ConnectorDecorator", this) as Control;
if (thumb != null)
{
ControlTemplate template =
DesignerItem.GetDragThumbTemplate(contentVisual) as ControlTemplate;
if (template != null)
{
thumb.Template = template;
}
}
if (connectorDecorator != null)
{
ControlTemplate template =
DesignerItem.GetConnectorDecoratorTemplate(contentVisual) as ControlTemplate;
if (template != null)
{
connectorDecorator.Template = template;
}
}
}
}
}
}