feat(osd): add volume osd popup window

config/Theme.qml

@@ -138,4 +138,13 @@ Singleton {
         property int textSpacing: 2
         property real bodyOpacity: 0.8
     }
+
+    property QtObject volume: QtObject {
+        property int width: 300
+        property int height: 48
+        property int iconSize: 22
+        property int barHeight: 10
+        property int timeout: 1500
+        property real bottomMarginRatio: 0.2
+    }
 }

modules/osd/VolumeCard.qml

@@ -0,0 +1,42 @@
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import Quickshell
+import qs.config
+import qs.services
+import qs.ui
+
+BarButton {
+    id: root
+
+    readonly property real level: Math.max(0, Math.min(Audio.muted ? 0 : Audio.volume, 1))
+    readonly property url iconUrl: `${Quickshell.shellPath("assets")}/icons/speaker.svg`
+
+    hoverHighlight: false
+    pointerCursor: false
+    iconOnly: true
+    iconSource: root.iconUrl
+    icon.width: Theme.volume.iconSize
+    icon.height: Theme.volume.iconSize
+
+    implicitWidth: Theme.volume.width
+    implicitHeight: Theme.volume.height
+
+    Rectangle {
+        id: fill
+
+        anchors.left: parent.left
+        anchors.top: parent.top
+        anchors.bottom: parent.bottom
+        implicitWidth: parent.width * root.level
+        radius: Theme.radius
+        color: Audio.muted ? Theme.colors.error : Theme.colors.accent
+        opacity: 0.35
+
+        Behavior on width {
+            NumberAnimation {
+                duration: Theme.duration
+            }
+        }
+    }
+}

services/Audio.qml

@@ -11,6 +11,8 @@ Singleton {
     readonly property string inputName: truncateText(root.displayName(Pipewire.defaultAudioSource), 14)
     readonly property url outputIcon: `${Quickshell.shellPath("assets")}/icons/speaker.svg`
     readonly property url inputIcon: `${Quickshell.shellPath("assets")}/icons/microphone.svg`
+    readonly property real volume: Pipewire.defaultAudioSink?.audio.volume ?? 0
+    readonly property bool muted: Pipewire.defaultAudioSink?.audio.muted ?? false
 
     function truncateText(text, maxLength) {
         return text.length > maxLength ? text.slice(0, maxLength - 3) + "..." : text;

shell.qml

@@ -4,4 +4,5 @@ import qs.windows
 Scope {
     Bar {}
     Notification {}
+    Volume {}
 }

windows/Volume.qml

@@ -0,0 +1,52 @@
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import Quickshell
+import qs.config
+import qs.services
+import "../modules/osd"
+
+PanelWindow {
+    id: root
+
+    property bool shown: false
+
+    color: "transparent"
+    exclusionMode: ExclusionMode.Ignore
+    visible: shown
+    implicitWidth: card.implicitWidth
+    implicitHeight: card.implicitHeight
+
+    anchors.bottom: true
+    margins.bottom: screen.height * Theme.volume.bottomMarginRatio
+
+    // An empty click mask prevents the window from blocking mouse events.
+    mask: Region {}
+
+    Connections {
+        target: Audio
+
+        function onVolumeChanged() {
+            root.shown = true;
+            hideTimer.restart();
+        }
+
+        function onMutedChanged() {
+            root.shown = true;
+            hideTimer.restart();
+        }
+    }
+
+    Timer {
+        id: hideTimer
+
+        interval: Theme.volume.timeout
+        onTriggered: root.shown = false
+    }
+
+    VolumeCard {
+        id: card
+
+        anchors.fill: parent
+    }
+}