From d5404dea25123567e9645d3e88a6cd0c14b2073f Mon Sep 17 00:00:00 2001
From: Greg Ercolano <erco@seriss.com>
Date: Mon, 8 Apr 2013 18:24:17 +0000
Subject: Fix for STR #2944 [2]: Fix Apple-specifc nested window problem for
 Fl_Gl_Window's.

                       Added new method Fl_Widget::window_offset(x,y)
		       to access the top-level window offset of the current widget.

		       Open to alternative names for the new method.



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9866 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Window.cxx | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src/Fl_Window.cxx')

diff --git a/src/Fl_Window.cxx b/src/Fl_Window.cxx
index 20bb520fd..b6e5985bc 100644
--- a/src/Fl_Window.cxx
+++ b/src/Fl_Window.cxx
@@ -278,6 +278,21 @@ void Fl_Window::icon(const void * ic) {
   icon_ = ic;
 }
 
+/**
+  Finds the x/y offset of the current window relative to the top-level window.
+  \param[out] xoff,yoff Returns the x/y offset
+  \returns the top-level window
+*/
+Fl_Window* Fl_Window::window_offset(int& xoff, int& yoff) const {
+  xoff = yoff = 0;
+  const Fl_Window *win = (const Fl_Window*)this;
+  while (win && win->window()) {
+    xoff += win->x();			// accumulate offsets
+    yoff += win->y();
+    win = win->window();		// walk up window hierarchy
+  }
+  return (Fl_Window*)win;
+}
 
 //
 // End of "$Id$".
-- 
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