audio: add IPC & OSD for changing output audio device

fixes #754

quickshell/Modules/OSD/AudioOutputOSD.qml

@@ -0,0 +1,80 @@
+import QtQuick
+import qs.Common
+import qs.Services
+import qs.Widgets
+
+DankOSD {
+    id: root
+
+    property string deviceName: ""
+    property string deviceIcon: "speaker"
+
+    osdWidth: Math.min(Math.max(120, Theme.iconSize + textMetrics.width + Theme.spacingS * 4), Screen.width - Theme.spacingM * 2)
+    osdHeight: 40 + Theme.spacingS * 2
+    autoHideInterval: 2500
+    enableMouseInteraction: false
+
+    TextMetrics {
+        id: textMetrics
+        font.pixelSize: Theme.fontSizeMedium
+        font.weight: Font.Medium
+        font.family: Theme.fontFamily
+        text: root.deviceName
+    }
+
+    function getIconForSink(sink) {
+        if (!sink)
+            return "speaker";
+        const name = sink.name || "";
+        if (name.includes("bluez"))
+            return "headset";
+        if (name.includes("hdmi"))
+            return "tv";
+        if (name.includes("usb"))
+            return "headset";
+        return "speaker";
+    }
+
+    Connections {
+        target: AudioService
+
+        function onAudioOutputCycled(name) {
+            if (!SettingsData.osdAudioOutputEnabled)
+                return;
+            root.deviceName = name;
+            root.deviceIcon = getIconForSink(AudioService.sink);
+            root.show();
+        }
+    }
+
+    content: Item {
+        property int gap: Theme.spacingS
+
+        anchors.centerIn: parent
+        width: parent.width - Theme.spacingS * 2
+        height: 40
+
+        DankIcon {
+            id: iconItem
+            width: Theme.iconSize
+            height: Theme.iconSize
+            x: parent.gap
+            anchors.verticalCenter: parent.verticalCenter
+            name: root.deviceIcon
+            size: Theme.iconSize
+            color: Theme.primary
+        }
+
+        StyledText {
+            id: textItem
+            x: parent.gap * 2 + Theme.iconSize
+            width: parent.width - Theme.iconSize - parent.gap * 3
+            anchors.verticalCenter: parent.verticalCenter
+            text: root.deviceName
+            font.pixelSize: Theme.fontSizeMedium
+            font.weight: Font.Medium
+            color: Theme.surfaceText
+            elide: Text.ElideRight
+        }
+    }
+}

quickshell/Modules/Settings/OSDTab.qml

@@ -141,6 +141,13 @@ Item {
                     checked: SettingsData.osdPowerProfileEnabled
                     onToggled: checked => SettingsData.set("osdPowerProfileEnabled", checked)
                 }
+
+                SettingsToggleRow {
+                    text: I18n.tr("Audio Output Switch")
+                    description: I18n.tr("Show on-screen display when cycling audio output devices")
+                    checked: SettingsData.osdAudioOutputEnabled
+                    onToggled: checked => SettingsData.set("osdAudioOutputEnabled", checked)
+                }
             }
         }
     }