Wl_data_offer.v1Handler for a proxy with version >= 1.
constraint 'a = [< `V1 | `V2 | `V3 ]method private virtual on_offer : [> `V1 | `V2 | `V3 ] t ->
mime_type:string ->
unitAdvertise offered mime type.
Sent immediately after creating the wl_data_offer object. One event per offered mime type.
method private virtual on_source_actions : [> `V3 ] t ->
source_actions:{Imports}1.Wl_data_device_manager.Dnd_action.t ->
unitNotify the source-side available actions.
This event indicates the actions offered by the data source. It will be sent immediately after creating the wl_data_offer object, or anytime the source side changes its offered actions through wl_data_source.set_actions.
method private virtual on_action : [> `V3 ] t ->
dnd_action:{Imports}1.Wl_data_device_manager.Dnd_action.t ->
unitNotify the selected action.
This event indicates the action selected by the compositor after matching the source/destination side actions. Only one action (or none) will be offered here.
This event can be emitted multiple times during the drag-and-drop operation in response to destination side action changes through wl_data_offer.set_actions.
This event will no longer be emitted after wl_data_device.drop happened on the drag-and-drop destination, the client must honor the last action received, or the last preferred one set through wl_data_offer.set_actions when handling an "ask" action.
Compositors may also change the selected action on the fly, mainly in response to keyboard modifier changes during the drag-and-drop operation.
The most recent action received is always the valid one. Prior to receiving wl_data_device.drop, the chosen action may change (e.g. due to keyboard modifiers being pressed). At the time of receiving wl_data_device.drop the drag-and-drop destination must honor the last action received.
Action changes may still happen after wl_data_device.drop, especially on "ask" actions, where the drag-and-drop destination may choose another action afterwards. Action changes happening at this stage are always the result of inter-client negotiation, the compositor shall no longer be able to induce a different action.
Upon "ask" actions, it is expected that the drag-and-drop destination may potentially choose a different action and/or mime type, based on wl_data_offer.source_actions and finally chosen by the user (e.g. popping up a menu with the available options). The final wl_data_offer.set_actions and wl_data_offer.accept requests must happen before the call to wl_data_offer.finish.