views/widget/window_manager.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_WINDOW_MANAGER_H_
#define VIEWS_WIDGET_WINDOW_MANAGER_H_
#pragma once

#include "base/basictypes.h"
#include "views/views_export.h"

namespace gfx {
class Point;
}

namespace views {
class MouseEvent;
class Widget;

// A interface to WindowManager.
class VIEWS_EXPORT WindowManager {
 public:
  WindowManager();
  virtual ~WindowManager();

  // Starts moving window given by |widget|. |point| represents the
  // initial location of the mouse pointer.
  virtual void StartMoveDrag(Widget* widget, const gfx::Point& point) = 0;

  // Starts resizing window give by |widget|. |point| represents the
  // initial location of the mouse pointer and |hittest_code| represents
  // the edge of the window a user selected to resize the window. See
  // views/window/hit_test.h for the hittest_code definition.
  virtual void StartResizeDrag(
      Widget* widget, const gfx::Point& point, int hittest_code) = 0;

  // Sets mouse capture on |widget|. Returns false if other widget
  // already has mouse capture.
  virtual bool SetMouseCapture(Widget* widget) = 0;

  // Releases the mouse capture on |widget|. Returns false if |widget|
  // haven't capture the mouse.
  virtual bool ReleaseMouseCapture(Widget* widget) = 0;

  // Checks if the |widget| has mouse capture.
  virtual bool HasMouseCapture(const Widget* widget) const = 0;

  // WindowManager handles mouse event first. It may reisze/move window,
  // or send the event to widget that has mouse capture.
  virtual bool HandleMouseEvent(Widget* widget, const MouseEvent& event) = 0;

  // Installs window manager.
  static void Install(WindowManager* wm);

  // Returns installed WindowManager.
  static WindowManager* Get();

 private:
  DISALLOW_COPY_AND_ASSIGN(WindowManager);
};

}  // namespace views

#endif  // VIEWS_WIDGET_WINDOW_MANAGER_H_