Desktop Aura: Allow tab drags out of window.

ui/views/widget/x11_desktop_window_move_client.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_X11_DESKTOP_WINDOW_MOVE_CLIENT_H_
+#define UI_VIEWS_WIDGET_X11_DESKTOP_WINDOW_MOVE_CLIENT_H_
+
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "ui/aura/client/window_move_client.h"
+#include "ui/aura/event_filter.h"
+#include "ui/views/views_export.h"
+#include "ui/gfx/point.h"
+
+namespace views {
+
+// When we're dragging tabs, we need to manually position our window.
+class VIEWS_EXPORT X11DesktopWindowMoveClient
+    : public aura::EventFilter,
+      public aura::client::WindowMoveClient {
+ public:
+  X11DesktopWindowMoveClient();
+  virtual ~X11DesktopWindowMoveClient();
+
+  // Overridden from aura::EventFilter:
+  virtual bool PreHandleKeyEvent(aura::Window* target,
+                                 ui::KeyEvent* event) OVERRIDE;
+  virtual bool PreHandleMouseEvent(aura::Window* target,
+                                   ui::MouseEvent* event) OVERRIDE;
+  virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
+                                              ui::TouchEvent* event) OVERRIDE;
+  virtual ui::GestureStatus PreHandleGestureEvent(
+      aura::Window* target,
+      ui::GestureEvent* event) OVERRIDE;
+
+  // Overridden from aura::client::WindowMoveClient:
+  virtual void RunMoveLoop(aura::Window* window,
+                           const gfx::Point& drag_offset) OVERRIDE;
+  virtual void EndMoveLoop() OVERRIDE;
+
+ private:
+  // Are we running a nested message loop from RunMoveLoop()?
+  bool in_move_loop_;
+
+  // Our cursor offset from the top left window origin when the drag
+  // started. Used to calculate the window's new bounds relative to the current
+  // location of the cursor.
+  gfx::Point window_offset_;
+
+  base::Closure quit_closure_;
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_X11_DESKTOP_WINDOW_MOVE_CLIENT_H_