Adding a new window type for frameless non-transient top level windows, used by ChromeOS' window ...

views/widget/widget.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIEWS_WIDGET_WIDGET_H_
 #define VIEWS_WIDGET_WIDGET_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 76 matching lines @@
  public:
   enum FrameType {
     FRAME_TYPE_DEFAULT,         // Use whatever the default would be.
     FRAME_TYPE_FORCE_CUSTOM,    // Force the custom frame.
     FRAME_TYPE_FORCE_NATIVE     // Force the native frame.
   };
 
   struct InitParams {
     enum Type {
       TYPE_WINDOW,      // A Window, like a frame window.
+      TYPE_WINDOW_FRAMELESS,

[Daniel Erat, 2011/06/09 05:40:22]

Naming suggestion: TYPE_WINDOW_UNMANAGED?  That's much more accurate for X, at
least (override-redirect windows are never decorated, but it's also possible to
disable decorations on windows that are still being managed by the window
manager).

I don't know much about the subtleties of WS_POPUP, and
http://msdn.microsoft.com/en-us/library/ms632600(v=vs.85).aspx is useless.  I'm
less excited about something like TYPE_WINDOW_FLOATING, but still prefer it to
_FRAMELESS.

[Daniel Erat, 2011/06/09 11:23:43]

Whoops, disregard this, of course.  For some reason, I'm more awake at 4 a.m.
than I was when I wrote this comment. :-/

http://developer.gnome.org/gtk/2.24/GtkWindow.html#gtk-window-set-decorated
could be used to get _FRAMELESS to behave as advertised on window managers that
typically draw decorations around windows.

+                        // An undecorated Window.
       TYPE_CONTROL,     // A control, like a button.
       TYPE_POPUP,       // An undecorated Window, with transient properties.
       TYPE_MENU         // An undecorated Window, with transient properties
                         // specialized to menus.
     };
     enum Ownership {
       // Default. Creator is not responsible for managing the lifetime of the
       // Widget, it is destroyed when the corresponding NativeWidget is
       // destroyed.
       NATIVE_WIDGET_OWNS_WIDGET,
@@ skipping 458 matching lines @@
 
   // Set to true if the widget is in the process of closing.
   bool widget_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif // VIEWS_WIDGET_WIDGET_H_