Add AGS volume widget

modules/home/ags/app/style.scss

@@ -6,7 +6,8 @@
     font-size: $font-size;
 }
 
-.Bar {
+.Bar,
+.popup-window {
     background: transparent;
 }
 
@@ -34,3 +35,52 @@
     font-weight: bold;
     margin: 0 8px;
 }
+
+.volume {
+    border-radius: 6px;
+    margin: 0 2px;
+    padding: 0 6px;
+}
+
+.ws:hover,
+.volume:hover {
+    background: transparentize($base05, 0.88);
+}
+
+.volume icon,
+.mute icon {
+    font-size: 16px;
+}
+
+.dropdown {
+    background: $base01;
+    border-radius: 10px;
+    padding: 8px 12px;
+    color: $base05;
+}
+
+.mute {
+    margin-right: 8px;
+    padding: 0 6px;
+    border-radius: 6px;
+}
+
+.vol-slider {
+    trough {
+        background: $base03;
+        border-radius: 999px;
+        min-height: 12px;
+
+        highlight {
+            background: $base0D;
+            border-radius: 999px;
+        }
+
+        slider {
+            min-width: 16px;
+            min-height: 16px;
+            background: $base05;
+            border-radius: 999px;
+        }
+    }
+}

modules/home/ags/app/widget/Bar.tsx

@@ -1,11 +1,14 @@
 import { App, Astal, Gdk, Gtk } from "astal/gtk3"
 import Workspaces from "./Workspaces"
 import Clock from "./Clock"
+import { VolumeWidget } from "./Volume"
 
 export default function Bar(gdkmonitor: Gdk.Monitor) {
     const { TOP, LEFT, RIGHT } = Astal.WindowAnchor
+    const volume = VolumeWidget(gdkmonitor)
 
-    return (
+    return [
+        (
             <window
                 className="Bar"
                 namespace="ags-bar"
@@ -33,8 +36,12 @@ export default function Bar(gdkmonitor: Gdk.Monitor) {
                         className="bar-right"
                         halign={Gtk.Align.END}
                         valign={Gtk.Align.CENTER}
-                />
+                    >
+                        {volume.button}
+                    </box>
                 </centerbox>
             </window>
-    )
+        ),
+        volume.popup,
+    ]
 }

modules/home/ags/app/widget/Dropdown.tsx

@@ -0,0 +1,86 @@
+import { App, Astal, Gdk, Gtk } from "astal/gtk3"
+import { Variable, bind } from "astal"
+
+interface DropdownProps {
+    gdkmonitor: Gdk.Monitor
+    target: Gtk.Widget
+    open: Variable<boolean>
+    width?: number
+    vertical?: boolean
+    className?: string
+    children: Array<JSX.Element>
+}
+
+export default function Dropdown({
+    gdkmonitor,
+    target,
+    open,
+    width = 260,
+    vertical = true,
+    className = "",
+    children,
+}: DropdownProps) {
+    const { TOP, BOTTOM, LEFT, RIGHT } = Astal.WindowAnchor
+    const GAP = 8
+
+    const child = (
+        <box
+            className={`dropdown ${className}`}
+            vertical={vertical}
+            widthRequest={width}
+            halign={Gtk.Align.START}
+            valign={Gtk.Align.START}
+        >
+            {children}
+        </box>
+    )
+
+    function reposition() {
+        const toplevel = target.get_toplevel()
+        const [, tx, ty] = target.translate_coordinates(toplevel, 0, 0)
+        const { width: bw, height: bh } = target.get_allocation()
+        const { width: sw } = gdkmonitor.get_geometry()
+
+        const x = Math.min(Math.max(tx + bw / 2 - width / 2, GAP), sw - width - GAP)
+        const y = ty + bh + GAP
+
+        child.marginStart = Math.round(x)
+        child.marginTop = Math.round(y)
+    }
+
+    open.subscribe((v) => {
+        if (v) reposition()
+    })
+
+    return (
+        <window
+            className="popup-window"
+            application={App}
+            gdkmonitor={gdkmonitor}
+            namespace="ags-bar-popup"
+            layer={Astal.Layer.OVERLAY}
+            keymode={Astal.Keymode.EXCLUSIVE}
+            anchor={TOP | BOTTOM | LEFT | RIGHT}
+            exclusivity={Astal.Exclusivity.IGNORE}
+            visible={bind(open)}
+            onNotifyVisible={(self) => {
+                if (!self.visible) open.set(false)
+            }}
+            onButtonPressEvent={(self, e) => {
+                const event = e as unknown as Gdk.Event
+                const [, px, py] = event.get_coords()
+                const { x, y, width: w, height: h } = child.get_allocation()
+                const xOut = px < x || px > x + w
+                const yOut = py < y || py > y + h
+
+                if (xOut || yOut) self.visible = false
+            }}
+            onKeyPressEvent={(self, e) => {
+                const event = e as unknown as Gdk.Event
+                if (event.get_keyval()[1] === Gdk.KEY_Escape) self.visible = false
+            }}
+        >
+            {child}
+        </window>
+    )
+}

modules/home/ags/app/widget/Volume.tsx

@@ -0,0 +1,54 @@
+import AstalWp from "gi://AstalWp"
+import { Variable, bind } from "astal"
+import Dropdown from "./Dropdown"
+
+const speaker = AstalWp.get_default().audio.default_speaker!
+
+const icon = Variable.derive(
+    [bind(speaker, "volume"), bind(speaker, "mute")],
+    (volume, mute) => {
+        if (mute || volume <= 0.01) return "audio-volume-muted-symbolic"
+        if (volume < 0.33) return "audio-volume-low-symbolic"
+        if (volume < 0.66) return "audio-volume-medium-symbolic"
+        return "audio-volume-high-symbolic"
+    }
+)
+
+export function VolumeWidget(gdkmonitor: Gdk.Monitor) {
+    const open = Variable(false)
+
+    const button = (
+        <button
+            className="volume"
+            onClicked={() => open.set(!open.get())}
+            onScroll={(_, e) => {
+                const volume = Math.min(1, Math.max(0, speaker.volume - e.delta_y * 0.02))
+                speaker.volume = volume
+            }}
+        >
+            <icon icon={icon()} />
+        </button>
+    )
+
+    const popup = (
+        <Dropdown
+            gdkmonitor={gdkmonitor}
+            target={button}
+            open={open}
+            width={240}
+            vertical={false}
+        >
+            <button className="mute" onClicked={() => (speaker.mute = !speaker.mute)}>
+                <icon icon={icon()} />
+            </button>
+            <slider
+                className="vol-slider"
+                hexpand
+                value={bind(speaker, "volume")}
+                onDragged={(self) => (speaker.volume = self.value)}
+            />
+        </Dropdown>
+    )
+
+    return { button, popup }
+}