LibGUI: Add GUI::Window::try_set_main_widget<T>(...)

This is a fallible variant of set_main_widget<T>() that returns ErrorOr.

1 files changed, 8 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGUI/Window.h b/Userland/Libraries/LibGUI/Window.h
index 3e5ee31bbf..8cca40b193 100644
--- a/Userland/Libraries/LibGUI/Window.h
+++ b/Userland/Libraries/LibGUI/Window.h
@@ -136,6 +136,14 @@ public:
     void set_main_widget(Widget*);
 
     template<class T, class... Args>
+    inline ErrorOr<NonnullRefPtr<T>> try_set_main_widget(Args&&... args)
+    {
+        auto widget = TRY(T::try_create(forward<Args>(args)...));
+        set_main_widget(widget.ptr());
+        return widget;
+    }
+
+    template<class T, class... Args>
     inline T& set_main_widget(Args&&... args)
     {
         auto widget = T::construct(forward<Args>(args)...);