feat: new clipboard manager module

src/clients/wayland/wlr_foreign_toplevel/handle.rs

@@ -0,0 +1,152 @@
+use std::collections::HashSet;
+use std::sync::{Arc, RwLock};
+use std::sync::atomic::{AtomicUsize, Ordering};
+use tracing::trace;
+use wayland_client::{DispatchData, Main};
+use wayland_protocols::wlr::unstable::foreign_toplevel::v1::client::zwlr_foreign_toplevel_handle_v1::{Event, ZwlrForeignToplevelHandleV1};
+use crate::write_lock;
+
+const STATE_ACTIVE: u32 = 2;
+const STATE_FULLSCREEN: u32 = 3;
+
+static COUNTER: AtomicUsize = AtomicUsize::new(1);
+
+fn get_id() -> usize {
+    COUNTER.fetch_add(1, Ordering::Relaxed)
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct ToplevelInfo {
+    pub id: usize,
+    pub app_id: String,
+    pub title: String,
+    pub active: bool,
+    pub fullscreen: bool,
+
+    ready: bool,
+}
+
+impl ToplevelInfo {
+    fn new() -> Self {
+        let id = get_id();
+        Self {
+            id,
+            ..Default::default()
+        }
+    }
+}
+
+pub struct Toplevel;
+
+#[derive(Debug, Clone)]
+pub struct ToplevelEvent {
+    pub toplevel: ToplevelInfo,
+    pub change: ToplevelChange,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum ToplevelChange {
+    New,
+    Close,
+    Title(String),
+    Focus(bool),
+    Fullscreen(bool),
+}
+
+fn toplevel_implem<F>(event: Event, info: &mut ToplevelInfo, implem: &mut F, ddata: DispatchData)
+where
+    F: FnMut(ToplevelEvent, DispatchData),
+{
+    trace!("event: {event:?} (info: {info:?})");
+
+    let change = match event {
+        Event::AppId { app_id } => {
+            info.app_id = app_id;
+            None
+        }
+        Event::Title { title } => {
+            info.title = title.clone();
+
+            if info.ready {
+                Some(ToplevelChange::Title(title))
+            } else {
+                None
+            }
+        }
+        Event::State { state } => {
+            // state is received as a `Vec<u8>` where every 4 bytes make up a `u32`
+            // the u32 then represents a value in the `State` enum.
+            assert_eq!(state.len() % 4, 0);
+
+            let state = (0..state.len() / 4)
+                .map(|i| {
+                    let slice: [u8; 4] = state[i * 4..i * 4 + 4]
+                        .try_into()
+                        .expect("Received invalid state length");
+                    u32::from_le_bytes(slice)
+                })
+                .collect::<HashSet<_>>();
+
+            let new_active = state.contains(&STATE_ACTIVE);
+            let new_fullscreen = state.contains(&STATE_FULLSCREEN);
+
+            let change = if info.ready && new_active != info.active {
+                Some(ToplevelChange::Focus(new_active))
+            } else if info.ready && new_fullscreen != info.fullscreen {
+                Some(ToplevelChange::Fullscreen(new_fullscreen))
+            } else {
+                None
+            };
+
+            info.active = new_active;
+            info.fullscreen = new_fullscreen;
+
+            change
+        }
+        Event::Closed => {
+            if info.ready {
+                Some(ToplevelChange::Close)
+            } else {
+                None
+            }
+        }
+        Event::OutputEnter { output: _ }
+        | Event::OutputLeave { output: _ }
+        | Event::Parent { parent: _ } => None,
+        Event::Done => {
+            if info.ready || info.app_id.is_empty() {
+                None
+            } else {
+                info.ready = true;
+                Some(ToplevelChange::New)
+            }
+        }
+
+        _ => unreachable!(),
+    };
+
+    if let Some(change) = change {
+        let event = ToplevelEvent {
+            change,
+            toplevel: info.clone(),
+        };
+
+        implem(event, ddata);
+    }
+}
+
+impl Toplevel {
+    pub fn init<F>(handle: &Main<ZwlrForeignToplevelHandleV1>, mut callback: F) -> Self
+    where
+        F: FnMut(ToplevelEvent, DispatchData) + 'static,
+    {
+        let inner = Arc::new(RwLock::new(ToplevelInfo::new()));
+
+        handle.quick_assign(move |_handle, event, ddata| {
+            let mut inner = write_lock!(inner);
+            toplevel_implem(event, &mut inner, &mut callback, ddata);
+        });
+
+        Self
+    }
+}