Merge pull request #3509 from bengotow/macosx-desktop-window

Support the "desktop" window type on Mac OS X

atom/browser/native_window_mac.mm

@@ -211,6 +211,8 @@ bool ScopedDisableResize::disable_resize_ = false;
 }
 @property BOOL acceptsFirstMouse;
 @property BOOL disableAutoHideCursor;
+@property BOOL disableKeyOrMainWindow;
+
 - (void)setShell:(atom::NativeWindowMac*)shell;
 - (void)setEnableLargerThanScreen:(bool)enable;
 @end
@@ -257,6 +259,16 @@ bool ScopedDisableResize::disable_resize_ = false;
   return [children filteredArrayUsingPredicate:predicate];
 }
 
+- (BOOL)canBecomeMainWindow
+{
+    return !self.disableKeyOrMainWindow;
+}
+
+- (BOOL)canBecomeKeyWindow
+{
+    return !self.disableKeyOrMainWindow;
+}
+
 @end
 
 @interface ControlRegionView : NSView
@@ -330,8 +342,6 @@ NativeWindowMac::NativeWindowMac(
       width,
       height);
 
-  bool useStandardWindow = true;
-  options.Get(options::kStandardWindow, &useStandardWindow);
   bool resizable = true;
   options.Get(options::kResizable, &resizable);
 
@@ -340,6 +350,17 @@ NativeWindowMac::NativeWindowMac(
   if (base::mac::IsOSYosemiteOrLater())
     options.Get(options::kTitleBarStyle, &titleBarStyle);
 
+  std::string windowType;
+  options.Get(options::kType, &windowType);
+
+  bool useStandardWindow = true;
+  // eventually deprecate separate "standardWindow" option in favor of
+  // standard / textured window types
+  options.Get(options::kStandardWindow, &useStandardWindow);
+  if (windowType == "textured") {
+    useStandardWindow = false;
+  }
+
   NSUInteger styleMask = NSTitledWindowMask | NSClosableWindowMask |
                          NSMiniaturizableWindowMask;
   if (!useStandardWindow || transparent() || !has_frame()) {
@@ -371,6 +392,15 @@ NativeWindowMac::NativeWindowMac(
     [window_ setBackgroundColor:[NSColor clearColor]];
   }
 
+  if (windowType == "desktop") {
+    [window_ setLevel:kCGDesktopWindowLevel - 1];
+    [window_ setDisableKeyOrMainWindow: YES];
+    [window_ setCollectionBehavior:
+        (NSWindowCollectionBehaviorCanJoinAllSpaces |
+         NSWindowCollectionBehaviorStationary |
+         NSWindowCollectionBehaviorIgnoresCycle)];
+  }
+
   // Remove non-transparent corners, see http://git.io/vfonD.
   if (!has_frame())
     [window_ setOpaque:NO];