Merge pull request #423 from mitchellh/split-focus

macos: fade unfocused splits

macos/Sources/Ghostty/Ghostty.SplitView.swift

@@ -183,6 +183,11 @@ extension Ghostty {
                 }
                 return clone
             }
+            
+            /// True if there are no neighbors
+            func isEmpty() -> Bool {
+                return self.previous == nil && self.next == nil
+            }
         }
     }
 
@@ -341,7 +346,7 @@ extension Ghostty {
             let pubClose = center.publisher(for: Notification.ghosttyCloseSurface, object: leaf.surface)
             let pubFocus = center.publisher(for: Notification.ghosttyFocusSplit, object: leaf.surface)
 
-            SurfaceWrapper(surfaceView: leaf.surface)
+            SurfaceWrapper(surfaceView: leaf.surface, isSplit: !neighbors.isEmpty())
                 .onReceive(pub) { onNewSplit(notification: $0) }
                 .onReceive(pubClose) { onClose(notification: $0) }
                 .onReceive(pubFocus) { onMoveFocus(notification: $0) }

macos/Sources/Ghostty/SurfaceView.swift

@@ -38,6 +38,10 @@ extension Ghostty {
         // remains the same, the surface that is being rendered remains the same.
         @ObservedObject var surfaceView: SurfaceView
         
+        // True if this surface is part of a split view. This is important to know so
+        // we know whether to dim the surface out of focus.
+        var isSplit: Bool = false
+        
         // Maintain whether our view has focus or not
         @FocusState private var surfaceFocus: Bool
         
@@ -49,6 +53,7 @@ extension Ghostty {
         private var hasFocus: Bool { surfaceFocus && windowFocus }
         
         var body: some View {
+            ZStack {
                 // We use a GeometryReader to get the frame bounds so that our metal surface
                 // is up to date. See TerminalSurfaceView for why we don't use the NSView
                 // resize callback.
@@ -116,6 +121,17 @@ extension Ghostty {
                         }
                 }
                 .ghosttySurfaceView(surfaceView)
+                
+                // If we're part of a split view and don't have focus, we put a semi-transparent
+                // rectangle above our view to make it look unfocused. We use "surfaceFocus"
+                // because we want to keep our focused surface dark even if we don't have window
+                // focus.
+                if (isSplit && !surfaceFocus) {
+                    Rectangle()
+                        .fill(.white)
+                        .opacity(0.15)
+                }
+            }
         }
     }