From d9b4ae8b2c6b37311f0bdff12bd438bbad456346 Mon Sep 17 00:00:00 2001
From: bnewbold <bnewbold@robocracy.org>
Date: Sun, 12 Jun 2016 12:14:27 -0400
Subject: examples: existing_window

---
 examples/existing_window.rs | 63 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 examples/existing_window.rs

diff --git a/examples/existing_window.rs b/examples/existing_window.rs
new file mode 100644
index 0000000..6fa6a21
--- /dev/null
+++ b/examples/existing_window.rs
@@ -0,0 +1,63 @@
+#![cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd"))]
+
+extern crate glutin;
+
+use std::env;
+use std::u64;
+use std::process::exit;
+mod support;
+
+use glutin::os::unix::WindowBuilderExt;
+
+fn resize_callback(width: u32, height: u32) {
+    println!("Window resized to {}x{}", width, height);
+}
+
+fn usage() {
+    println!("This example requires a single argument (a hex/decimal X Window ID");
+    println!("You can find this with, eg, 'xwininfo -tree'");
+}
+
+fn main() {
+
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() != 2 {
+        usage();
+        exit(-1);
+    }
+
+    let window_id_parse = {
+        if (&args[1]).starts_with("0x") {
+            u64::from_str_radix(args[1].trim_left_matches('0').trim_left_matches('x'), 16)
+        } else {
+            args[1].parse::<u64>()
+        }
+    };
+    let window_id = window_id_parse.expect("Failed to parse numerical arg");
+
+    let mut window = glutin::WindowBuilder::new()
+                                           .from_existing_window(window_id)
+                                           .build()
+                                           .unwrap();
+    window.set_window_resize_callback(Some(resize_callback as fn(u32, u32)));
+    let _ = unsafe { window.make_current() };
+
+    println!("Pixel format of the window: {:?}", window.get_pixel_format());
+
+    let context = support::load(&window);
+
+    println!("Mouse over target window to draw; events will be printed here");
+
+    for event in window.wait_events() {
+        context.draw_frame((0.0, 1.0, 0.0, 1.0));
+        let _ = window.swap_buffers();
+
+        println!("{:?}", event);
+
+        match event {
+            glutin::Event::Closed => break,
+            _ => ()
+        }
+    }
+}
-- 
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