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-rw-r--r--src/Fl_Window.cxx7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/Fl_Window.cxx b/src/Fl_Window.cxx
index 50f39f04e..e6f14141b 100644
--- a/src/Fl_Window.cxx
+++ b/src/Fl_Window.cxx
@@ -876,3 +876,10 @@ const Fl_Image* Fl_Window::shape() {return pWindowDriver->shape();}
/** Returns true when a window is being rescaled */
bool Fl_Window::is_a_rescale() {return Fl_Window_Driver::is_a_rescale_;}
+
+/** Returns a platform-specific identification of a shown window, or 0 if not shown.
+ \li X11 platform: the window's XID.
+ \li macOS platform: The window number of the window’s window device.
+ \li other platforms: 0.
+ */
+fl_uintptr_t Fl_Window::os_id() { return pWindowDriver->os_id();}