MonitorManager to manage multiple monitors.

ui/aura/monitor_manager.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_AURA_MONITOR_MANAGER_H_
+#define UI_AURA_MONITOR_MANAGER_H_
+#pragma once
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "ui/aura/aura_export.h"
+#include "ui/gfx/insets.h"
+namespace gfx {
+class Point;
+}
+
+namespace aura {
+class Monitor;
+class RootWindow;
+class Window;
+
+class AURA_EXPORT MonitorManager {
+ public:
+  MonitorManager();
+  virtual ~MonitorManager();
+
+  virtual const Monitor* GetMonitorNearestWindow(
+      const Window* window) const = 0;
+  virtual  const Monitor* GetMonitorNearestPoint(
+      const gfx::Point& point) const = 0;
+  virtual const Monitor* GetPrimaryMonitor() const = 0;
+
+  virtual size_t GetNumMonitors() const = 0;
+
+ protected:
+  friend class RootWindow;
+  friend class ScreenAura;
+
+  virtual Monitor* GetMonitorNearestWindow(const Window* window) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MonitorManager);
+};
+
+AURA_EXPORT MonitorManager* CreateSingleMonitorManager(RootWindow* root_window);
+
+}  // namespace aura
+
+#endif  // UI_AURA_MONITOR_MANAGER_H_