Creates a widget that can be used as a drag icon for the given
value.
Supported types include strings, gdk.rgba.RGBA and gtk.text_buffer.TextBuffer.
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-and-drop
operations started by gtk.drag_source.DragSource, 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, gdk.rgba.RGBA and gtk.text_buffer.TextBuffer. 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-and-drop operations started by gtk.drag_source.DragSource, so you don't need to set a drag icon using this function there.