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use std::{
ops::DerefMut,
sync::{Arc, Mutex},
};
use wayland_client::protocol::wl_surface::WlSurface;
use crate::{
data_device_manager::data_offer::DataDeviceOffer,
reexports::client::{
event_created_child,
protocol::{
wl_data_device::{self, WlDataDevice},
wl_data_offer::{self, WlDataOffer},
wl_seat::WlSeat,
},
Connection, Dispatch, Proxy, QueueHandle,
},
};
use super::{
data_offer::{DataOfferData, DataOfferHandler, DragOffer, SelectionOffer},
DataDeviceManagerState,
};
/// Handler trait for DataDevice events.
///
/// The functions defined in this trait are called as DataDevice events are received from the compositor.
pub trait DataDeviceHandler: Sized {
// Introduces a new data offer
// ASHLEY left out because the data offer will be introduced to the user once the type is known
// either through the enter method or the selection method.
// fn data_offer(
// &mut self,
// conn: &Connection,
// qh: &QueueHandle<Self>,
// data_device: DataDevice,
// offer: WlDataOffer,
// );
/// The data device pointer has entered a surface at the provided location
fn enter(
&mut self,
conn: &Connection,
qh: &QueueHandle<Self>,
data_device: &WlDataDevice,
x: f64,
y: f64,
wl_surface: &WlSurface,
);
/// The drag and drop pointer has left the surface and the session ends.
/// The offer will be destroyed unless it was previously dropped.
/// In the case of a dropped offer, the client must destroy it manually after it is finished.
fn leave(&mut self, conn: &Connection, qh: &QueueHandle<Self>, data_device: &WlDataDevice);
/// Drag and Drop motion.
fn motion(
&mut self,
conn: &Connection,
qh: &QueueHandle<Self>,
data_device: &WlDataDevice,
x: f64,
y: f64,
);
/// Advertises a new selection.
fn selection(&mut self, conn: &Connection, qh: &QueueHandle<Self>, data_device: &WlDataDevice);
/// Drop performed.
/// After the next data offer action event, data may be able to be received, unless the action is "ask".
fn drop_performed(
&mut self,
conn: &Connection,
qh: &QueueHandle<Self>,
data_device: &WlDataDevice,
);
}
#[derive(Debug, Eq, PartialEq)]
pub struct DataDevice {
pub(crate) device: WlDataDevice,
}
impl DataDevice {
pub fn data(&self) -> &DataDeviceData {
self.device.data().unwrap()
}
/// Unset the selection of the provided data device as a response to the event with with provided serial.
pub fn unset_selection(&self, serial: u32) {
self.device.set_selection(None, serial);
}
pub fn inner(&self) -> &WlDataDevice {
&self.device
}
}
impl Drop for DataDevice {
fn drop(&mut self) {
if self.device.version() >= 2 {
self.device.release()
}
}
}
impl<D> Dispatch<wl_data_device::WlDataDevice, DataDeviceData, D> for DataDeviceManagerState
where
D: Dispatch<wl_data_device::WlDataDevice, DataDeviceData>
+ Dispatch<wl_data_offer::WlDataOffer, DataOfferData>
+ DataDeviceHandler
+ DataOfferHandler
+ 'static,
{
event_created_child!(D, WlDataDevice, [
0 => (WlDataOffer, Default::default())
]);
fn event(
state: &mut D,
data_device: &wl_data_device::WlDataDevice,
event: wl_data_device::Event,
data: &DataDeviceData,
conn: &Connection,
qh: &QueueHandle<D>,
) {
use wayland_client::protocol::wl_data_device::Event;
let mut inner = data.inner.lock().unwrap();
match event {
Event::DataOffer { id } => {
inner.undetermined_offers.push(id.clone());
let data = id.data::<DataOfferData>().unwrap();
data.init_undetermined_offer(&id);
}
Event::Enter { serial, surface, x, y, id } => {
// XXX the spec isn't clear here.
if let Some(offer) = inner.drag_offer.take() {
offer.destroy();
}
if let Some(offer) = id {
if let Some(i) = inner.undetermined_offers.iter().position(|o| o == &offer) {
inner.undetermined_offers.remove(i);
}
let data = offer.data::<DataOfferData>().unwrap();
data.to_dnd_offer(serial, surface.clone(), x, y, None);
inner.drag_offer = Some(offer.clone());
}
// XXX Drop done here to prevent Mutex deadlocks.
drop(inner);
state.enter(conn, qh, data_device, x, y, &surface);
}
Event::Leave => {
// We must destroy the offer we've got on enter.
if let Some(offer) = inner.drag_offer.take() {
let data = offer.data::<DataOfferData>().unwrap();
if !data.leave() {
inner.drag_offer = Some(offer);
}
}
// XXX Drop done here to prevent Mutex deadlocks.
drop(inner);
state.leave(conn, qh, data_device);
}
Event::Motion { time, x, y } => {
if let Some(offer) = inner.drag_offer.take() {
let data = offer.data::<DataOfferData>().unwrap();
// Update the data offer location.
data.motion(x, y, time);
inner.drag_offer = Some(offer);
}
// XXX Drop done here to prevent Mutex deadlocks.
drop(inner);
state.motion(conn, qh, data_device, x, y);
}
Event::Drop => {
if let Some(offer) = inner.drag_offer.take() {
let data = offer.data::<DataOfferData>().unwrap();
let mut drag_inner = data.inner.lock().unwrap();
if let DataDeviceOffer::Drag(ref mut o) = drag_inner.deref_mut().offer {
o.dropped = true;
}
drop(drag_inner);
inner.drag_offer = Some(offer);
}
// XXX Drop done here to prevent Mutex deadlocks.
drop(inner);
// Pass the info about the drop to the user.
state.drop_performed(conn, qh, data_device);
}
Event::Selection { id } => {
// We must drop the current offer regardless.
if let Some(offer) = inner.selection_offer.take() {
offer.destroy();
}
if let Some(offer) = id {
if let Some(i) = inner.undetermined_offers.iter().position(|o| o == &offer) {
inner.undetermined_offers.remove(i);
}
let data = offer.data::<DataOfferData>().unwrap();
data.to_selection_offer();
inner.selection_offer = Some(offer.clone());
// XXX Drop done here to prevent Mutex deadlocks.
drop(inner);
state.selection(conn, qh, data_device);
}
}
_ => unreachable!(),
}
}
}
#[derive(Debug)]
pub struct DataDeviceData {
/// The seat associated with this device.
pub(crate) seat: WlSeat,
/// The inner mutable storage.
pub(crate) inner: Arc<Mutex<DataDeviceInner>>,
}
impl DataDeviceData {
pub(crate) fn new(seat: WlSeat) -> Self {
Self { seat, inner: Default::default() }
}
/// Get the seat associated with this data device.
pub fn seat(&self) -> &WlSeat {
&self.seat
}
/// Get the active dnd offer if it exists.
pub fn drag_offer(&self) -> Option<DragOffer> {
self.inner.lock().unwrap().drag_offer.as_ref().and_then(|offer| {
let data = offer.data::<DataOfferData>().unwrap();
data.as_drag_offer()
})
}
/// Get the active selection offer if it exists.
pub fn selection_offer(&self) -> Option<SelectionOffer> {
self.inner.lock().unwrap().selection_offer.as_ref().and_then(|offer| {
let data = offer.data::<DataOfferData>().unwrap();
data.as_selection_offer()
})
}
}
#[derive(Debug, Default)]
pub(crate) struct DataDeviceInner {
/// the active dnd offer and its data
pub drag_offer: Option<WlDataOffer>,
/// the active selection offer and its data
pub selection_offer: Option<WlDataOffer>,
/// the active undetermined offers and their data
pub undetermined_offers: Vec<WlDataOffer>,
}