Enum wayland_server::protocol::wl_data_offer::Event

#[non_exhaustive]
pub enum Event<'a> {
    Offer {
        mime_type: String,
    },
    SourceActions {
        source_actions: WEnum<DndAction>,
    },
    Action {
        dnd_action: WEnum<DndAction>,
    },
}

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Offer

advertise offered mime type

Sent immediately after creating the wl_data_offer object. One event per offered mime type.

Fields

mime_type: String

offered mime type

SourceActions

notify 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.

Only available since version 3 of the interface

Fields

source_actions: WEnum<DndAction>

actions offered by the data source

Action

notify 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.

Only available since version 3 of the interface

Fields

dnd_action: WEnum<DndAction>

action selected by the compositor

Implementations

impl<'a> Event<'a>

pub fn opcode(&self) -> u16

Get the opcode number of this message

Trait Implementations

impl<'a> Debug for Event<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.