From 63c56bad6fcc55f99d1437da7cd1b0b68fd9cc88 Mon Sep 17 00:00:00 2001
From: Chris Naporlee <55722668+chrisn731@users.noreply.github.com>
Date: Mon, 23 Mar 2026 19:08:58 -0400
Subject: protocols: reimplement unstable/xdg-foreign-v2 (#13716)

---
 src/protocols/XDGShell.cpp | 69 ++++++++++++++++++++++------------------------
 1 file changed, 33 insertions(+), 36 deletions(-)

(limited to 'src/protocols/XDGShell.cpp')

diff --git a/src/protocols/XDGShell.cpp b/src/protocols/XDGShell.cpp
index 969556a3..774346d4 100644
--- a/src/protocols/XDGShell.cpp
+++ b/src/protocols/XDGShell.cpp
@@ -220,52 +220,49 @@ CXDGToplevelResource::CXDGToplevelResource(SP<CXdgToplevel> resource_, SP<CXDGSu
     });
 
     m_resource->setSetParent([this](CXdgToplevel* r, wl_resource* parentR) {
-        auto oldParent = m_parent;
-
-        if (m_parent)
-            std::erase(m_parent->m_children, m_self);
-
         auto newp = parentR ? CXDGToplevelResource::fromResource(parentR) : nullptr;
+        setNewParent(newp);
+    });
+}
 
-        if (newp) {
-            // check for protocol constraints
-            if (newp == m_self) {
-                r->error(XDG_TOPLEVEL_ERROR_INVALID_PARENT, "Parent cannot be self");
-                return;
-            }
-
-            static std::function<bool(WP<CXDGToplevelResource>, WP<CXDGToplevelResource>)> exploreChildren = [](WP<CXDGToplevelResource> tl,
-                                                                                                                WP<CXDGToplevelResource> target) -> bool {
-                bool any = false;
-                for (const auto& c : tl->m_children) {
-                    if (c == target)
-                        return true;
-
-                    any = any || exploreChildren(c, target);
+void CXDGToplevelResource::setNewParent(SP<CXDGToplevelResource> newParent) {
+    auto oldParent = m_parent;
 
-                    if (any)
-                        break;
-                }
-                return any;
-            };
+    if (m_parent)
+        std::erase(m_parent->m_children, m_self);
 
-            if (exploreChildren(m_self, newp)) {
-                r->error(XDG_TOPLEVEL_ERROR_INVALID_PARENT, "Parent cannot be a descendant");
-                return;
-            }
+    if (newParent) {
+        if (m_self == newParent) {
+            m_resource->error(XDG_TOPLEVEL_ERROR_INVALID_PARENT, "Parent cannot be self");
+            return;
         }
 
-        m_parent = newp;
+        static std::function<bool(WP<CXDGToplevelResource>, WP<CXDGToplevelResource>)> exploreChildren = [](WP<CXDGToplevelResource> tl, WP<CXDGToplevelResource> target) -> bool {
+            bool any = false;
+            for (const auto& c : tl->m_children) {
+                if (c == target)
+                    return true;
 
-        if (m_parent) {
-            m_parent->m_children.emplace_back(m_self);
+                any = any || exploreChildren(c, target);
 
-            if (m_parent->m_window && m_parent->m_window->m_pinned)
-                m_self->m_window->m_pinned = true;
+                if (any)
+                    break;
+            }
+            return any;
+        };
+        if (exploreChildren(m_self, newParent)) {
+            m_resource->error(XDG_TOPLEVEL_ERROR_INVALID_PARENT, "Parent cannot be a descendant of itself");
+            return;
         }
+    }
 
-        LOGM(Log::DEBUG, "Toplevel {:x} sets parent to {:x}{}", (uintptr_t)this, (uintptr_t)newp.get(), (oldParent ? std::format(" (was {:x})", (uintptr_t)oldParent.get()) : ""));
-    });
+    m_parent = newParent;
+    if (m_parent) {
+        m_parent->m_children.emplace_back(m_self);
+        if (m_parent->m_window && m_parent->m_window->m_pinned)
+            m_self->m_window->m_pinned = true;
+    }
+    LOGM(Log::DEBUG, "Toplevel {:x} sets parent to {:x}{}", (uintptr_t)this, (uintptr_t)newParent.get(), (oldParent ? std::format(" (was {:x})", (uintptr_t)oldParent.get()) : ""));
 }
 
 CXDGToplevelResource::~CXDGToplevelResource() {
-- 
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