Merge pull request #1504 from mitchellh/macos-focus

macos: more robust surface focus state detection

macos/Sources/Features/Terminal/TerminalController.swift

@@ -14,7 +14,11 @@ class TerminalController: NSWindowController, NSWindowDelegate,
     let ghostty: Ghostty.App
     
     /// The currently focused surface.
-    var focusedSurface: Ghostty.SurfaceView? = nil
+    var focusedSurface: Ghostty.SurfaceView? = nil {
+        didSet {
+            syncFocusToSurfaceTree()
+        }
+    }
     
     /// The surface tree for this window.
     @Published var surfaceTree: Ghostty.SplitNode? = nil {
@@ -23,6 +27,7 @@ class TerminalController: NSWindowController, NSWindowDelegate,
             // in the old tree have closed and then close the window.
             if (surfaceTree == nil) {
                 oldValue?.close()
+                focusedSurface = nil
                 lastSurfaceDidClose()
             }
         }
@@ -181,6 +186,21 @@ class TerminalController: NSWindowController, NSWindowDelegate,
         }
     }
     
+    /// Update all surfaces with the focus state. This ensures that libghostty has an accurate view about
+    /// what surface is focused. This must be called whenever a surface OR window changes focus.
+    private func syncFocusToSurfaceTree() {
+        guard let tree = self.surfaceTree else { return }
+
+        for leaf in tree {
+            // Our focus state requires that this window is key and our currently
+            // focused surface is the surface in this leaf.
+            let focused: Bool = (window?.isKeyWindow ?? false) &&
+                focusedSurface != nil &&
+                leaf.surface == focusedSurface!
+            leaf.surface.focusDidChange(focused)
+        }
+    }
+    
     //MARK: - NSWindowController
     
     override func windowWillLoad() {
@@ -348,6 +368,16 @@ class TerminalController: NSWindowController, NSWindowDelegate,
     func windowDidBecomeKey(_ notification: Notification) {
         self.relabelTabs()
         self.fixTabBar()
+        
+        // Becoming/losing key means we have to notify our surface(s) that we have focus
+        // so things like cursors blink, pty events are sent, etc.
+        self.syncFocusToSurfaceTree()
+    }
+    
+    func windowDidResignKey(_ notification: Notification) {
+        // Becoming/losing key means we have to notify our surface(s) that we have focus
+        // so things like cursors blink, pty events are sent, etc.
+        self.syncFocusToSurfaceTree()
     }
     
     func windowDidMove(_ notification: Notification) {

macos/Sources/Ghostty/Ghostty.SplitNode.swift

@@ -11,7 +11,7 @@ extension Ghostty {
     ///   "container" which has a recursive top/left SplitNode and bottom/right SplitNode. These
     ///   values can further be split infinitely.
     ///
-    enum SplitNode: Equatable, Hashable, Codable {
+    enum SplitNode: Equatable, Hashable, Codable, Sequence {
         case leaf(Leaf)
         case split(Container)
         
@@ -136,6 +136,24 @@ extension Ghostty {
             }
         }
         
+        // MARK: - Sequence
+        
+        func makeIterator() -> IndexingIterator<[Leaf]> {
+            return leaves().makeIterator()
+        }
+        
+        /// Return all the leaves in this split node. This isn't very efficient but our split trees are never super
+        /// deep so its not an issue.
+        private func leaves() -> [Leaf] {
+            switch (self) {
+            case .leaf(let leaf):
+                return [leaf]
+
+            case .split(let container):
+                return container.topLeft.leaves() + container.bottomRight.leaves()
+            }
+        }
+        
         // MARK: - Equatable
         
         static func == (lhs: SplitNode, rhs: SplitNode) -> Bool {

macos/Sources/Ghostty/SurfaceView.swift

@@ -51,10 +51,6 @@ extension Ghostty {
 
         @EnvironmentObject private var ghostty: Ghostty.App
 
-        // This is true if the terminal is considered "focused". The terminal is focused if
-        // it is both individually focused and the containing window is key.
-        private var hasFocus: Bool { surfaceFocus && windowFocus }
-
         var body: some View {
             let center = NotificationCenter.default
             
@@ -72,7 +68,7 @@ extension Ghostty {
                     let pubResign = center.publisher(for: NSWindow.didResignKeyNotification)
                     #endif
 
-                    Surface(view: surfaceView, hasFocus: hasFocus, size: geo.size)
+                    Surface(view: surfaceView, size: geo.size)
                         .focused($surfaceFocus)
                         .focusedValue(\.ghosttySurfaceTitle, surfaceView.title)
                         .focusedValue(\.ghosttySurfaceView, surfaceView)
@@ -230,11 +226,6 @@ extension Ghostty {
         /// The view to render for the terminal surface.
         let view: SurfaceView
 
-        /// This should be set to true when the surface has focus. This is up to the parent because
-        /// focus is also defined by window focus. It is important this is set correctly since if it is
-        /// false then the surface will idle at almost 0% CPU.
-        let hasFocus: Bool
-
         /// The size of the frame containing this view. We use this to update the the underlying
         /// surface. This does not actually SET the size of our frame, this only sets the size
         /// of our Metal surface for drawing.
@@ -253,7 +244,6 @@ extension Ghostty {
         }
 
         func updateOSView(_ view: SurfaceView, context: Context) {
-            view.focusDidChange(hasFocus)
             view.sizeDidChange(size)
         }
     }

macos/Sources/Ghostty/SurfaceView_AppKit.swift

@@ -188,6 +188,8 @@ extension Ghostty {
 
         func focusDidChange(_ focused: Bool) {
             guard let surface = self.surface else { return }
+            guard self.focused != focused else { return }
+            self.focused = focused
             ghostty_surface_set_focus(surface, focused)
         }
 
@@ -358,7 +360,7 @@ extension Ghostty {
         
         override func becomeFirstResponder() -> Bool {
             let result = super.becomeFirstResponder()
-            if (result) { focused = true }
+            if (result) { focusDidChange(true) }
             return result
         }
 
@@ -367,10 +369,7 @@ extension Ghostty {
 
             // We sometimes call this manually (see SplitView) as a way to force us to
             // yield our focus state.
-            if (result) {
-                focusDidChange(false)
-                focused = false
-            }
+            if (result) { focusDidChange(false) }
 
             return result
         }