Desktop Aura: Allow tab drags out of window.

ui/views/widget/desktop_native_widget_helper_aura.h

 // Copyright (c) 2012 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 UI_VIEWS_WIDGET_DESKTOP_NATIVE_WIDGET_HELPER_AURA_H_
 #define UI_VIEWS_WIDGET_DESKTOP_NATIVE_WIDGET_HELPER_AURA_H_
 
 #include "ui/aura/root_window_observer.h"
+#include "ui/aura/window_observer.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/native_widget_helper_aura.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura {
 class RootWindow;
 class DesktopCursorClient;
+class DesktopWindowMoveClient;
 namespace client {
 class ScreenPositionClient;
 }
 namespace shared {
 class CompoundEventFilter;
 class InputMethodEventFilter;
 class RootWindowCaptureClient;
 }
 }
 
 namespace ui {
 #if defined(OS_WIN)
 class HWNDMessageFilter;
 #endif
 }
 
 namespace views {
 class NativeWidgetAura;
 class WidgetMessageFilter;
 #if defined(USE_X11)
+class X11DesktopWindowMoveClient;
 class X11WindowEventFilter;
 #endif
 
 // Implementation of non-Ash desktop integration code, allowing
 // NativeWidgetAuras to work in a traditional desktop environment.
 class VIEWS_EXPORT DesktopNativeWidgetHelperAura
     : public NativeWidgetHelperAura,
+      public aura::WindowObserver,
       public aura::RootWindowObserver {
  public:
   explicit DesktopNativeWidgetHelperAura(NativeWidgetAura* widget);
   virtual ~DesktopNativeWidgetHelperAura();
 
   // In general, views/ does not care about the aura::RootWindow, even though
   // at any join point with the native OS, we're going to be dealing in
   // RootWindows.
   static aura::Window* GetViewsWindowForRootWindow(aura::RootWindow* root);
 
   // Overridden from aura::NativeWidgetHelperAura:
   virtual void PreInitialize(aura::Window* window,
                              const Widget::InitParams& params) OVERRIDE;
   virtual void PostInitialize() OVERRIDE;
-  virtual void ShowRootWindow() OVERRIDE;
   virtual aura::RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::Rect ModifyAndSetBounds(const gfx::Rect& bounds) OVERRIDE;
 
+  // Overridden from aura::WindowObserver:
+  virtual void OnWindowVisibilityChanged(aura::Window* window,
+                                         bool visible) OVERRIDE;
+
   // Overridden from aura::RootWindowObserver:
   virtual void OnRootWindowResized(const aura::RootWindow* root,
                                    const gfx::Size& old_size) OVERRIDE;
+  virtual void OnRootWindowMoved(const aura::RootWindow* root,
+                                 const gfx::Point& new_origin) OVERRIDE;
   virtual void OnRootWindowHostClosed(const aura::RootWindow* root) OVERRIDE;
 
  private:
   // A weak pointer back to our owning widget.
   NativeWidgetAura* widget_;
 
+  // The window from the NativeWidgetAura. We observe events on it, and proxy
+  // visibility stuff to
+  aura::Window* window_;
+
   // Optionally, a RootWindow that we attach ourselves to.
   scoped_ptr<aura::RootWindow> root_window_;
 
   // Toplevel event filter which dispatches to other event filters.
   aura::shared::CompoundEventFilter* root_window_event_filter_;
 
   // An event filter that pre-handles all key events to send them to an IME.
   scoped_ptr<aura::shared::InputMethodEventFilter> input_method_filter_;
 
   // TODO(erg): This is temporary. Find out what needs to be done for desktop
   // environment.
   scoped_ptr<aura::shared::RootWindowCaptureClient> capture_client_;
 
   // We want some windows (omnibox, status bar) to have their own
   // NativeWidgetAura, but still act as if they're screen bounded toplevel
   // windows.
   bool is_embedded_window_;
 
   // In some cases, we set a screen position client on |root_window_|. If we
   // do, we're responsible for the lifetime.
   scoped_ptr<aura::client::ScreenPositionClient> position_client_;
 
   // A simple cursor client which just forwards events to the RootWindow.
   scoped_ptr<aura::DesktopCursorClient> cursor_client_;
 
+  // Handles spinning up the nested run loop for tab dragging.
+
 #if defined(OS_WIN)
   scoped_ptr<ui::HWNDMessageFilter> hwnd_message_filter_;
 #elif defined(USE_X11)
   scoped_ptr<X11WindowEventFilter> x11_window_event_filter_;
+  scoped_ptr<X11DesktopWindowMoveClient> x11_window_move_client_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNativeWidgetHelperAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_NATIVE_WIDGET_HELPER_AURA_H_