/// <summary>
/// Initializes a new instance of the DragOperation class.
/// </summary>
/// <param name="dragSource">The source of the drag operation.</param>
/// <param name="data">The data associated with the drag operation.
/// </param>
/// <param name="allowedEffects">The allowed effects of the drag
/// operation.
/// </param>
/// <param name="initialKeyState">The initial state of the keys relevant
/// to drag operations.</param>
public DragOperation(DependencyObject dragSource, object data, SW.DragDropEffects allowedEffects, SW.DragDropKeyStates initialKeyState)
{
SW.IDataObject dataObject = data as SW.IDataObject;
if (dataObject == null)
{
dataObject = new DataObject(data);
}
_allowedEffects = allowedEffects;
KeyStates = initialKeyState;
_dragSource = dragSource;
SW.DragEventArgs dragStartEventArgs =
new SW.DragEventArgs()
{
OriginalSource = dragSource,
AllowedEffects = allowedEffects,
Effects = allowedEffects,
Data = dataObject
};
_lastDragEventArgs = dragStartEventArgs;
dragStartEventArgs.AllowedEffects = allowedEffects;
dragStartEventArgs.Data = dataObject;
this._dragStartEventArgs = dragStartEventArgs;
IObservable <Event <SW.QueryContinueDragEventArgs> > sourceQueryContinue =
from dragStartedEvent in _dragStarting
from queryContinueDragEvent in _dragSourceQueryContinueDrag.Until(_dragCompleted)
where queryContinueDragEvent.EventArgs.Handled
select queryContinueDragEvent;
sourceQueryContinue
.Where(queryContinueDragEvent => queryContinueDragEvent.EventArgs.Action == SW.DragAction.Drop)
.Subscribe(queryContinueDragEvent => OnTargetDrop());
sourceQueryContinue
.Where(queryContinueDragEvent => queryContinueDragEvent.EventArgs.Action == SW.DragAction.Cancel)
.Subscribe(queryContinueDragEvent => OnCancel());
_dragCompleted.Subscribe(_ => IsDragging = false);
}
/// <summary>
/// Retrieves the data based using the first acceptable format.
/// </summary>
/// <param name="that">The data object.</param>
/// <returns>The data retrieved from the data object.</returns>
public static object GetData(this SW.IDataObject that)
{
return(that.GetData(that.GetFormats()[0]));
}