apprt: move newTab to a surface callback rather than app

src/App.zig

@@ -124,7 +124,6 @@ fn drainMailbox(self: *App, rt_app: *apprt.App) !void {
         log.debug("mailbox message={s}", .{@tagName(message)});
         switch (message) {
             .new_window => |msg| try self.newWindow(rt_app, msg),
-            .new_tab => |msg| try self.newTab(rt_app, msg),
             .close => |surface| try self.closeSurface(rt_app, surface),
             .quit => try self.setQuit(),
             .surface_message => |msg| try self.surfaceMessage(msg.surface, msg.message),
@@ -160,27 +159,6 @@ fn newWindow(self: *App, rt_app: *apprt.App, msg: Message.NewWindow) !void {
     try rt_app.newWindow(parent);
 }
 
-/// Create a new tab in the parent window
-fn newTab(self: *App, rt_app: *apprt.App, msg: Message.NewTab) !void {
-    if (!@hasDecl(apprt.App, "newTab")) {
-        log.warn("newTab is not supported by this runtime", .{});
-        return;
-    }
-
-    const parent = msg.parent orelse {
-        log.warn("parent must be set in new_tab message", .{});
-        return;
-    };
-
-    // If the parent was closed prior to us handling the message, we do nothing.
-    if (!self.hasSurface(parent)) {
-        log.warn("new_tab parent is gone, not launching a new tab", .{});
-        return;
-    }
-
-    try rt_app.newTab(parent);
-}
-
 /// Start quitting
 fn setQuit(self: *App) !void {
     if (self.quit) return;
@@ -218,11 +196,6 @@ pub const Message = union(enum) {
     /// Create a new terminal window.
     new_window: NewWindow,
 
-    /// Create a new tab within the tab group of the focused window.
-    /// This does nothing if we're on a platform or using a window
-    /// environment that doesn't support tabs.
-    new_tab: NewTab,
-
     /// Close a surface. This notifies the runtime that a surface
     /// should close.
     close: *Surface,
@@ -246,11 +219,6 @@ pub const Message = union(enum) {
         /// The parent surface
         parent: ?*Surface = null,
     };
-
-    const NewTab = struct {
-        /// The parent surface
-        parent: ?*Surface = null,
-    };
 };
 
 /// Mailbox is the way that other threads send the app thread messages.

src/Surface.zig

@@ -910,11 +910,9 @@ pub fn keyCallback(
                 },
 
                 .new_tab => {
-                    _ = self.app_mailbox.push(.{
+                    if (@hasDecl(apprt.Surface, "newTab")) {
-                        .new_tab = .{
+                        try self.rt_surface.newTab();
-                            .parent = self,
+                    } else log.warn("runtime doesn't implement newTab", .{});
-                        },
-                    }, .{ .instant = {} });
                 },
 
                 .previous_tab => {

src/apprt/glfw.zig

@@ -79,7 +79,7 @@ pub const App = struct {
     }
 
     /// Create a new tab in the parent surface.
-    pub fn newTab(self: *App, parent: *CoreSurface) !void {
+    fn newTab(self: *App, parent: *CoreSurface) !void {
         if (!Darwin.enabled) {
             log.warn("tabbing is not supported on this platform", .{});
             return;
@@ -356,6 +356,11 @@ pub const Surface = struct {
         }
     }
 
+    /// Create a new tab in the window containing this surface.
+    pub fn newTab(self: *Surface) !void {
+        try self.app.newTab(&self.core_surface);
+    }
+
     /// Set the size limits of the window.
     /// Note: this interface is not good, we should redo it if we plan
     /// to use this more. i.e. you can't set max width but no max height,

src/apprt/gtk.zig

@@ -157,11 +157,6 @@ pub const App = struct {
         try window.init(self);
     }
 
-    pub fn newTab(self: *App, parent: *CoreSurface) !void {
-        _ = self;
-        try parent.rt_surface.window.newTab();
-    }
-
     fn activate(app: *c.GtkApplication, ud: ?*anyopaque) callconv(.C) void {
         _ = app;
         _ = ud;
@@ -584,6 +579,10 @@ pub const Surface = struct {
         self.window.closeSurface(self);
     }
 
+    pub fn newTab(self: *Surface) !void {
+        try self.window.newTab();
+    }
+
     pub fn gotoPreviousTab(self: *Surface) void {
         self.window.gotoPreviousTab(self);
     }