From fc73d2bb719a7777ede23a8740ed50e2df3735d9 Mon Sep 17 00:00:00 2001
From: Snider <snider@host.uk.com>
Date: Wed, 15 Apr 2026 20:13:37 +0100
Subject: [PATCH] Add display window opacity websocket command

---
 pkg/display/display.go      | 12 ++++++++++++
 pkg/display/display_test.go | 20 ++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/pkg/display/display.go b/pkg/display/display.go
index e26f9fd9..17edc470 100644
--- a/pkg/display/display.go
+++ b/pkg/display/display.go
@@ -878,6 +878,18 @@ func (s *Service) handleWSMessage(msg WSMessage) core.Result {
 				Primary: primary, Secondary: secondary, ScreenID: screenID, Ratio: ratio,
 			}},
 		))
+	case "window:set-opacity":
+		name, e := wsRequire(msg.Data, "name")
+		if e != nil {
+			return core.Result{Value: e, OK: false}
+		}
+		opacity, ok := msg.Data["opacity"].(float64)
+		if !ok {
+			return core.Result{Value: coreerr.E("display.handleWSMessage", "missing required field \"opacity\"", nil), OK: false}
+		}
+		return c.Action("window.setOpacity").Run(ctx, core.NewOptions(
+			core.Option{Key: "task", Value: window.TaskSetOpacity{Name: name, Opacity: opacity}},
+		))
 	default:
 		return core.Result{Value: coreerr.E("display.handleWSMessage", "unknown websocket action: "+msg.Action, nil), OK: false}
 	}
diff --git a/pkg/display/display_test.go b/pkg/display/display_test.go
index a253c13b..30f93418 100644
--- a/pkg/display/display_test.go
+++ b/pkg/display/display_test.go
@@ -372,6 +372,26 @@ func TestSetWindowTitle_Good(t *testing.T) {
 	assert.NoError(t, err)
 }
 
+func TestHandleWSMessage_SetWindowOpacity_Good(t *testing.T) {
+	c := newTestConclave(t)
+	svc := core.MustServiceFor[*Service](c, "display")
+	_ = svc.OpenWindow(window.WithName("opacity-win"))
+
+	r := svc.handleWSMessage(WSMessage{
+		Action: "window:set-opacity",
+		Data: map[string]any{
+			"name":    "opacity-win",
+			"opacity": 0.35,
+		},
+	})
+	require.True(t, r.OK)
+
+	info, err := svc.GetWindowInfo("opacity-win")
+	require.NoError(t, err)
+	require.NotNil(t, info)
+	assert.InDelta(t, 0.35, info.Opacity, 0.0001)
+}
+
 func TestGetFocusedWindow_Good(t *testing.T) {
 	c := newTestConclave(t)
 	svc := core.MustServiceFor[*Service](c, "display")