/// <summary>
/// Event handler for the <see cref="PreviewDrop"/> event
/// </summary>
/// <param name="sender">the sender of the event</param>
/// <param name="e">the <see cref="DragEventArgs"/> associated to the event</param>
/// <remarks>
/// Occurs when the input system reports an underlying drop event with this element as the drop target.
/// </remarks>
private void PreviewDrop(object sender, DragEventArgs e)
{
this.dropInfo = new DiagramDropInfo(sender, e)
{
DiagramDropPoint = this.GetDiagramPositionFromMousePosition(this.dropInfo.DropPosition)
};
var dropTarget = this.AssociatedObject.DataContext as IDropTarget;
if (dropTarget != null)
{
dropTarget.Drop(this.dropInfo);
e.Handled = true;
}
}
/// <summary>
/// Event handler for the <see cref="PreviewDragOver"/> event
/// </summary>
/// <param name="sender">the sender of the event</param>
/// <param name="e">the <see cref="DragEventArgs"/> associated to the event</param>
/// <remarks>
/// Occurs when the input system reports an underlying drag event with this element as the potential drop target.
/// </remarks>
private void PreviewDragOver(object sender, DragEventArgs e)
{
this.dropInfo = new DiagramDropInfo(sender, e);
var dropTarget = this.AssociatedObject.DataContext as IDropTarget;
if (dropTarget != null)
{
dropTarget.DragOver(this.dropInfo);
e.Effects = this.dropInfo.Effects;
e.Handled = true;
}
var dependencyObject = sender as DependencyObject;
if (dependencyObject != null)
{
this.Scroll(dependencyObject, e);
}
}
/// <summary>
/// Event handler for the <see cref="PreviewDragLeave"/> event
/// </summary>
/// <param name="sender">the sender of the event</param>
/// <param name="e">the <see cref="DragEventArgs"/> associated to the event</param>
/// <remarks>
/// Occurs when the input system reports an underlying drag event with this element as the drag origin.
/// </remarks>
private void PreviewDragLeave(object sender, DragEventArgs e)
{
this.dropInfo = null;
e.Handled = true;
}
