The targets (data formats) in which the source can provide the data
A bitmask of the allowed drag actions for this drag
The button the user clicked to start the drag
The event that triggered the start of the drag, or %NULL if none can be obtained.
Return: the context for this drag
Deprecated: Use gtk_drag_begin_with_coordinates() instead
This function is equivalent to gtk_drag_begin_with_coordinates(), passing -1, -1 as coordinates.