From 065a50d9d5cc8fb719a59494ea6e63e24ba7a47b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaakko=20Ker=C3=A4nen?= <jaakko.keranen@iki.fi>
Date: Wed, 13 Apr 2016 21:34:03 +0300
Subject: [PATCH] Widgets|libcore: Checking for a potential ancestor widget

---
 doomsday/sdk/libcore/include/de/widgets/widget.h | 1 +
 doomsday/sdk/libcore/src/widgets/widget.cpp      | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/doomsday/sdk/libcore/include/de/widgets/widget.h b/doomsday/sdk/libcore/include/de/widgets/widget.h
index 2cccbb0529..7050159c4b 100644
--- a/doomsday/sdk/libcore/include/de/widgets/widget.h
+++ b/doomsday/sdk/libcore/include/de/widgets/widget.h
@@ -223,6 +223,7 @@ class DENG2_PUBLIC Widget
     Widget *remove(Widget &child);
     Widget *find(String const &name);
     bool isInTree(Widget const &child) const;
+    bool hasAncestor(Widget const &ancestorOrParent) const;
     Widget const *find(String const &name) const;
     void moveChildBefore(Widget *child, Widget const &otherChild);
     void moveChildToLast(Widget &child);
diff --git a/doomsday/sdk/libcore/src/widgets/widget.cpp b/doomsday/sdk/libcore/src/widgets/widget.cpp
index 1077f9e546..8f448aa2da 100644
--- a/doomsday/sdk/libcore/src/widgets/widget.cpp
+++ b/doomsday/sdk/libcore/src/widgets/widget.cpp
@@ -393,6 +393,15 @@ bool Widget::isInTree(Widget const &child) const
     return false;
 }
 
+bool Widget::hasAncestor(Widget const &ancestorOrParent) const
+{
+    for(Widget const *iter = parent(); iter; iter = iter->parent())
+    {
+        if(iter == &ancestorOrParent) return true;
+    }
+    return false;
+}
+
 Widget const *Widget::find(String const &name) const
 {
     return const_cast<Widget *>(this)->find(name);