public static void DoDragDrop(DependencyObject dragSource, object data, DragDropEffects allowedEffects,
DragDropCompletedCallback onDragDropCompleted = null)
{
int callbackId = CallbackId++;
_callbacks[callbackId] = onDragDropCompleted;
DoDragDropHelper(dragSource, data, allowedEffects, callbackId, _dragDropCompleted);
}
public static void DoDragDrop(DependencyObject dragSource, object data, DragDropEffects allowedEffects,
DragDropCompletedCallback onDragDropCompleted)
{
DragDropCallbackInfo info = new DragDropCallbackInfo {
Callback = onDragDropCompleted
};
int callbackId = info.GetHashCode();
_dragDropCallbacks[callbackId] = info;
DoDragDropHelper(dragSource, data, allowedEffects, callbackId, _dragDropCompleted);
}
private static void OnDragDropCompleted(int callbackId, IntPtr sourcePtr,
IntPtr dataPtr, IntPtr targetPtr, IntPtr dropPointPtr, int effects)
{
try {
DragDropCompletedCallback callback = _callbacks[callbackId];
if (callback != null)
{
DependencyObject source = (DependencyObject)Extend.GetProxy(sourcePtr, false);
DataObject data = new DataObject(Extend.GetProxy(dataPtr, false));
UIElement target = (UIElement)Extend.GetProxy(targetPtr, false);
Point dropPoint = Marshal.PtrToStructure <Point>(dropPointPtr);
callback(source, data, target, dropPoint, (DragDropEffects)effects);
}
_callbacks.Remove(callbackId);
}
catch (Exception e) {
Noesis.Error.UnhandledException(e);
}
}