mixer: add example

mixer/MixerEntry.qml

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+import QtQuick
+import QtQuick.Layouts
+import QtQuick.Controls
+import Quickshell.Services.Pipewire
+
+ColumnLayout {
+	required property PwNode node;
+
+	// bind the node so we can read its properties
+	PwObjectTracker { objects: [ node ] }
+
+	RowLayout {
+		Image {
+			visible: source != ""
+			source: {
+				const icon = node.properties["application.icon-name"] ?? "audio-volume-high-symbolic";
+				return `image://icon/${icon}`;
+			}
+
+			sourceSize.width: 20
+			sourceSize.height: 20
+		}
+
+		Label {
+			text: {
+				// application.name -> description -> name
+				const app = node.properties["application.name"] ?? (node.description != "" ? node.description : node.name);
+				const media = node.properties["media.name"];
+				return media != undefined ? `${app} - ${media}` : app;
+			}
+		}
+
+		Button {
+			text: node.audio.muted ? "unmute" : "mute"
+			onClicked: node.audio.muted = !node.audio.muted
+		}
+	}
+
+	RowLayout {
+		Label {
+			Layout.preferredWidth: 50
+			text: `${Math.floor(node.audio.volume * 100)}%`
+		}
+
+		Slider {
+			Layout.fillWidth: true
+			value: node.audio.volume
+			onValueChanged: node.audio.volume = value
+		}
+	}
+}

mixer/README.md

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+# Audio mixer
+
+This is a simple audio mixer built with the pipewire API.
+
+You can run the mixer with `quickshell -p shell.qml`.
+
+![](./image.png)

mixer/shell.qml

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+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import Quickshell
+import Quickshell.Services.Pipewire
+
+ShellRoot {
+	FloatingWindow {
+		// match the system theme background color
+		color: contentItem.palette.active.window
+
+		ScrollView {
+			anchors.fill: parent
+			contentWidth: availableWidth
+
+			ColumnLayout {
+				anchors.fill: parent
+				anchors.margins: 10
+
+				// get a list of nodes that output to the default sink
+				PwNodeLinkTracker {
+					id: linkTracker
+					node: Pipewire.defaultAudioSink
+				}
+
+				MixerEntry {
+					node: Pipewire.defaultAudioSink
+				}
+
+				Rectangle {
+					Layout.fillWidth: true
+					color: palette.active.text
+					implicitHeight: 1
+				}
+
+				Repeater {
+					model: linkTracker.linkGroups
+
+					MixerEntry {
+						required property PwLinkGroup modelData
+						// Each link group contains a source and a target.
+						// Since the target is the default sink, we want the source.
+						node: modelData.source
+					}
+				}
+			}
+		}
+	}
+}