island: follow the pointer across monitors (experiment)

- one island window per monitor (window_per_monitor), shown only on the
  monitor of the focused workspace; hyprland focuses the monitor under
  the mouse (input:follow_mouse = 1), so the island follows the pointer
- hidden windows return before reading any other service, so music and
  animations only wake the shown one: still 60 frames a second in total
- the Workspaces service re-reads j/workspaces and j/monitors on every
  hyprland event
- without a workspace list (other compositors) every monitor shows it

src/island.rs

@@ -5,9 +5,9 @@ use std::time::{Duration, Instant};
 
 use amane::{
     Animation, Arc, Argument, Blend, Bus, Canvas, Cap, Center, Color, Column, Easing, End, Full, Gradient,
-    Image, InputArea, Layer, LayerWindow, Line, Media, MediaPlayer, Padding, Palette, Parent, Path,
+    Image, InputArea, Layer, LayerWindow, Line, Media, MediaPlayer, Monitor, Padding, Palette, Parent, Path,
     Pointer, Rectangle, Row, Scroll, ScrollArea, Service, Shadow, Shape, SpaceBetween, Stack,
-    Start, Text, Vertical, Weight, Widget, Zone, children, shapes,
+    Start, Text, Vertical, Weight, Widget, Workspaces, Zone, children, shapes,
 };
 
 use crate::art::Art;
@@ -226,14 +226,7 @@ struct Scene<'a> {
     levels: &'a [f32],
 }
 
-pub fn view() -> LayerWindow {
+pub fn view(monitor: &Monitor) -> LayerWindow {
-    let media = Media::read();
-    let island = Island::read();
-    let sound = Sound::read();
-    let art = Art::read();
-    let palette = Palette::read();
-    let spectrum = Spectrum::read();
-
     let window_w = WIDE_W + 2.0 * SHADOW;
 
     let window = LayerWindow::new()
@@ -245,6 +238,27 @@ pub fn view() -> LayerWindow {
         .space(Zone::Ignore)
         .namespace("magic-island");
 
+    /*
+     * one island window per monitor, shown only on the focused one: hyprland focuses
+     * the monitor under the mouse (input:follow_mouse), so the island follows the
+     * pointer. the hidden ones return before reading anything else, so music and
+     * animations only wake the shown one. no workspace list (another compositor):
+     * every monitor shows it
+     */
+    let workspaces = Workspaces::read();
+    let focused = workspaces.list().iter().find(|workspace| workspace.focused()).and_then(|workspace| workspace.output());
+
+    if focused.is_some_and(|name| name != monitor.name) {
+        return window.visible(false);
+    }
+
+    let media = Media::read();
+    let island = Island::read();
+    let sound = Sound::read();
+    let art = Art::read();
+    let palette = Palette::read();
+    let spectrum = Spectrum::read();
+
     let Some(player) = shown(&media, island.selected.as_deref()) else {
         return window.visible(false);
     };

src/main.rs

@@ -10,5 +10,5 @@ fn main() {
     // the card's glow follows the cover art, which art::Art copies to this one path
     Palette::write().open(&art::palette_file(), 8);
 
-    App::new().font("Fira Code").ipc("island", island::command).window(island::view).run();
+    App::new().font("Fira Code").ipc("island", island::command).window_per_monitor(island::view).run();
 }