Creates a widget that can be used as a drag icon for the given
@value.
Supported types include strings, GdkRGBA and GtkTextBuffer.
If GTK does not know how to create a widget for a given value,
it will return %NULL.
This method is used to set the default drag icon on drag'n'drop
operations started by GtkDragSource, so you don't need to set
a drag icon using this function there.
Creates a widget that can be used as a drag icon for the given @value.
Supported types include strings, GdkRGBA and GtkTextBuffer. If GTK does not know how to create a widget for a given value, it will return %NULL.
This method is used to set the default drag icon on drag'n'drop operations started by GtkDragSource, so you don't need to set a drag icon using this function there.