Add application volume mixer

config/dot/quickshell/sound-page-harness.qml

@@ -9,11 +9,55 @@ import qs.services
 import qs.modules.settings
 
 ShellRoot {
+    id: root
+
+    QtObject {
+        id: fixtureAudio
+        property real volume: 0.42
+        property bool muted: false
+    }
+
+    QtObject {
+        id: fixtureNode
+        property QtObject audio: fixtureAudio
+    }
+
+    readonly property var fixtureApplication: ({
+        key: "fixture.player",
+        label: "Fixture Player",
+        icon: "audio-x-generic-symbolic",
+        nodes: [fixtureNode]
+    })
+
     SoundPage {
         width: 760
         height: 900
     }
 
+    ApplicationMixer {
+        id: populatedMixer
+        width: 620
+        visible: false
+        applications: [root.fixtureApplication]
+        pipewireReady: true
+    }
+
+    ApplicationMixer {
+        id: emptyMixer
+        width: 620
+        visible: false
+        applications: []
+        pipewireReady: true
+    }
+
+    ApplicationMixer {
+        id: unavailableMixer
+        width: 620
+        visible: false
+        applications: []
+        pipewireReady: false
+    }
+
     PwObjectTracker {
         objects: AudioDevices.outputs.concat(AudioDevices.inputs)
     }
@@ -26,8 +70,15 @@ ShellRoot {
                 ready: Pipewire.ready,
                 outputs: AudioDevices.outputs.length,
                 inputs: AudioDevices.inputs.length,
+                applications: AudioDevices.applications.length,
                 defaultOutput: AudioDevices.label(AudioDevices.current(true)),
-                defaultInput: AudioDevices.label(AudioDevices.current(false))
+                defaultInput: AudioDevices.label(AudioDevices.current(false)),
+                populatedRows: populatedMixer.rowCount,
+                populatedStatus: populatedMixer.statusText,
+                emptyRows: emptyMixer.rowCount,
+                emptyStatus: emptyMixer.statusText,
+                unavailableRows: unavailableMixer.rowCount,
+                unavailableStatus: unavailableMixer.statusText
             });
         }
     }