island: open the window source's properties from the pill

A Wayland window capture is chosen in the portal picker, which only OBS's
source dialog can open. In a scene whose only source is a PipeWire capture,
the panel gets a Window button that opens that dialog. A window scene with
more than one source needs a per-scene designation the pill does not have yet.

3 files changed, 30 insertions, 6 deletions

diff --git a/desktop/island/Obs.qml b/desktop/island/Obs.qml
index 9b8ba06..593e978 100644
--- a/desktop/island/Obs.qml
+++ b/desktop/island/Obs.qml
@@ -34,6 +34,9 @@ Singleton {
     property real duration: 0
     property var scenes: []
     property string scene: ""
+    // The current scene's items as { name, kind }, for the window-source
+    // properties button. Kept current with the same GetSceneItemList call.
+    property var sources: []
     // The webcam: the first v4l2_input item in the current scene, -1 for none.
     // ponytail: a webcam inside a group or nested scene is not found; walk
     // GetGroupSceneItemList if one ever is.
@@ -58,6 +61,10 @@ Singleton {
         if (desktopAudio)
             request("SetInputMute", { inputName: desktopAudio, inputMuted: !desktopMuted });
     }
+    // Opens OBS's source dialog, which is where the Wayland portal picker runs.
+    function openSource(name) {
+        if (name) request("OpenInputPropertiesDialog", { inputName: name });
+    }
     // The corner math assumes the webcam item is top-left aligned (alignment 5).
     function moveCam(corner) {
         if (camId < 0 || baseWidth <= 0 || camW <= 0 || camH <= 0) return;
@@ -109,6 +116,7 @@ Singleton {
         recording = false; paused = false; duration = 0;
         stateFromEvents = false;
         scenes = []; scene = ""; camId = -1; camOn = false;
+        sources = [];
         camW = 0; camH = 0;
         desktopAudio = ""; desktopMuted = false;
         baseWidth = 0; baseHeight = 0;
@@ -238,6 +246,7 @@ Singleton {
             request("GetSceneItemList", { sceneName: scene });
             break;
         case "GetSceneItemList": {
+            sources = r.sceneItems.map(i => ({ name: i.sourceName, kind: i.inputKind }));
             const it = r.sceneItems.find(i => i.inputKind === "v4l2_input");
             camId = it ? it.sceneItemId : -1;
             camOn = !!it && it.sceneItemEnabled;
diff --git a/desktop/island/ObsPill.qml b/desktop/island/ObsPill.qml
index 6ae9b4e..3fdb4a3 100644
--- a/desktop/island/ObsPill.qml
+++ b/desktop/island/ObsPill.qml
@@ -27,6 +27,12 @@ Capsule {
     panelWidth: 260
     panelHeight: controls.implicitHeight + 28
 
+    // A scene whose only source is a PipeWire capture is the window scene.
+    // ponytail: a window scene with more than one source needs a per-scene
+    // designation instead of this count.
+    readonly property bool windowOnly: Obs.sources.length === 1
+        && Obs.sources[0].kind === "pipewire-screen-capture-source"
+
     Row {
         id: rest
         anchors.centerIn: parent
@@ -93,7 +99,7 @@ Capsule {
 
         Row {
             spacing: 8
-            visible: Obs.camId >= 0 || Obs.desktopAudio !== ""
+            visible: Obs.camId >= 0 || Obs.desktopAudio !== "" || pill.windowOnly
             Button {
                 visible: Obs.camId >= 0
                 icon: Obs.camOn ? "\udb81\udd67" : "\udb81\udd68"
@@ -106,6 +112,13 @@ Capsule {
                 text: "Audio"
                 onClicked: Obs.toggleAudio()
             }
+            // OBS's source dialog, where the Wayland portal window picker runs.
+            Button {
+                visible: pill.windowOnly
+                icon: "\uf2d0"
+                text: "Window"
+                onClicked: Obs.openSource(Obs.sources[0].name)
+            }
         }
 
         // The webcam's four corners on the recorded canvas.
diff --git a/desktop/island/README.md b/desktop/island/README.md
index 71455f3..7bd7b10 100644
--- a/desktop/island/README.md
+++ b/desktop/island/README.md
@@ -84,11 +84,13 @@ click opens its panel in the capsule: Record or Stop, Pause or Resume
 (while recording), Webcam (the first `v4l2_input` item in the current
 scene; absent without one), Audio (mute the global "Desktop Audio" input),
 four corner buttons that move the webcam on the canvas, and a scene grid,
-four columns of icon tiles, current one highlighted, click to switch. The
-scene glyphs come from `~/.config/quickshell/obs-scene-icons.json`, watched
-and edited from the settings window's "OBS scenes" page; an unmapped scene
-shows `?`. While recording the sliver pulses red, and holds dim while
-paused.
+four columns of icon tiles, current one highlighted, click to switch. In a
+scene whose only source is a PipeWire capture (the window scene), a Window
+button opens that source's properties, where OBS's portal picker chooses the
+window. The scene glyphs come from
+`~/.config/quickshell/obs-scene-icons.json`, watched and edited from the
+settings window's "OBS scenes" page; an unmapped scene shows `?`. While
+recording the sliver pulses red, and holds dim while paused.
 
 QML's `WebSocket` does not expose the close code, so a wrong password
 reads the same as OBS quitting; it is logged once as "closed before