Re: FW: [gtkmm] drag and drop with multiple targets

[Callum Prentice <lists callum com>]

okay - understood up to this point thanks to your clear description.

> 3) the source widget's signal_drag_data_get() signal is now triggered,
>    so the event handler put the actual data to be transferred into the
>    GtkSelectionData structure

in the example i have, the data is set in the event handler method using
gtk_selection_data_set () but all widgets trigger the same method and (as far as i can tell)
there is nothing passed in that allows me to differentiate between widgets.

if i could for instance, get the address of the source widget and store that instead of a
piece of text, i could get it back in my signal_drag_data_received() handler method.

> 4) the destination widget's signal_drag_data_received() is called with
>    the GtkSelectionData structure the source widget populated (it should
>    process and free this data)

i am able to retrieve the source widget here by virtue of Gtk::Widget::drag_get_source_widget
() method but there is no drag_get_dest_widget () or similar - i really need to know which
widget was dropped onto so the rest of my logic can decide how to proceed.

i can see how to do it with a different handler method for each widget but since there will be
lots - perhaps hundreds - of them, that really isn't an option.

once i have the source and destination widgets, my code will rearrange the widgets visually
(it's for a "face" based address book that allows you to shuffle the entries manually).

callum.