From cb0811faf3d328b624364b9a2b3641504be82183 Mon Sep 17 00:00:00 2001
From: Corey Farwell <coreyf@rwell.org>
Date: Sat, 26 Nov 2016 15:53:38 -0500
Subject: [PATCH] Implement window transparency on macOS.

Fixes https://github.com/tomaka/winit/issues/57.
---
 Cargo.toml                | 2 +-
 src/platform/macos/mod.rs | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 6fab8a0f..661016c2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ objc = "0.2"
 [target.'cfg(target_os = "macos")'.dependencies]
 objc = "0.2"
 cgl = "0.1"
-cocoa = "0.5.0"
+cocoa = "0.5.2"
 core-foundation = "0"
 core-graphics = "0.4"
 
diff --git a/src/platform/macos/mod.rs b/src/platform/macos/mod.rs
index 8687197e..299f9c3e 100644
--- a/src/platform/macos/mod.rs
+++ b/src/platform/macos/mod.rs
@@ -14,7 +14,7 @@ use objc::declare::ClassDecl;
 use cocoa::base::{id, nil};
 use cocoa::foundation::{NSAutoreleasePool, NSDate, NSDefaultRunLoopMode, NSPoint, NSRect, NSSize,
                         NSString, NSUInteger};
-use cocoa::appkit::{self, NSApplication, NSEvent, NSView, NSWindow};
+use cocoa::appkit::{self, NSApplication, NSColor, NSEvent, NSView, NSWindow};
 
 use core_graphics::display::{CGAssociateMouseAndMouseCursorPosition, CGMainDisplayID, CGDisplayPixelsHigh, CGWarpMouseCursorPosition};
 
@@ -287,7 +287,8 @@ impl Window {
 
         unsafe {
             if win_attribs.transparent {
-                unimplemented!();
+                (*window as id).setOpaque_(NO);
+                (*window as id).setBackgroundColor_(NSColor::clearColor(nil));
             }
 
             app.activateIgnoringOtherApps_(YES);