From 04e3bcfa75deaa0dc6e55241b8d8142440af5e10 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 30 Dec 2020 13:41:53 +0100
Subject: [PATCH] LibGUI: Add Window::center_within(Window)

This allows you to easily center one window within another window.
---
 Libraries/LibGUI/Window.cpp | 9 +++++++++
 Libraries/LibGUI/Window.h   | 1 +
 2 files changed, 10 insertions(+)

diff --git a/Libraries/LibGUI/Window.cpp b/Libraries/LibGUI/Window.cpp
index 351a68a8eb..7fcd0ee14b 100644
--- a/Libraries/LibGUI/Window.cpp
+++ b/Libraries/LibGUI/Window.cpp
@@ -239,6 +239,15 @@ void Window::center_on_screen()
     set_rect(window_rect);
 }
 
+void Window::center_within(const Window& other)
+{
+    if (this == &other)
+        return;
+    auto window_rect = rect();
+    window_rect.center_within(other.rect());
+    set_rect(window_rect);
+}
+
 void Window::set_window_type(WindowType window_type)
 {
     m_window_type = window_type;
diff --git a/Libraries/LibGUI/Window.h b/Libraries/LibGUI/Window.h
index f4298c6986..b13933c268 100644
--- a/Libraries/LibGUI/Window.h
+++ b/Libraries/LibGUI/Window.h
@@ -108,6 +108,7 @@ public:
     void resize(const Gfx::IntSize& size) { set_rect({ position(), size }); }
 
     void center_on_screen();
+    void center_within(const Window&);
 
     virtual void event(Core::Event&) override;