new_tab action

src/Window.zig

@@ -542,6 +542,18 @@ pub fn shouldClose(self: Window) bool {
     return self.window.shouldClose();
 }
 
+/// Add a window to the tab group of this window.
+pub fn addWindow(self: Window, other: *Window) void {
+    assert(builtin.target.isDarwin());
+
+    const NSWindowOrderingMode = enum(isize) { below = -1, out = 0, above = 1 };
+    const nswindow = objc.Object.fromId(glfwNative.getCocoaWindow(self.window).?);
+    nswindow.msgSend(void, objc.sel("addTabbedWindow:ordered:"), .{
+        objc.Object.fromId(glfwNative.getCocoaWindow(other.window).?),
+        NSWindowOrderingMode.above,
+    });
+}
+
 /// Called from the app thread to handle mailbox messages to our specific
 /// window.
 pub fn handleMessage(self: *Window, msg: Message) !void {
@@ -953,6 +965,20 @@ fn keyCallback(
                     win.app.wakeup();
                 },
 
+                .new_tab => {
+                    _ = win.app.mailbox.push(.{
+                        .new_tab = .{
+                            .parent = win,
+
+                            .font_size = if (win.config.@"window-inherit-font-size")
+                                win.font_size
+                            else
+                                null,
+                        },
+                    }, .{ .instant = {} });
+                    win.app.wakeup();
+                },
+
                 .close_window => win.window.setShouldClose(true),
 
                 .quit => {