gecko-dev/ipc/glue/WindowsMessageLoop.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Plugin App.
 *
 * The Initial Developer of the Original Code is
 *   Ben Turner <bent.mozilla@gmail.com>
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef IPC_GLUE_WINDOWSMESSAGELOOP_H
#define IPC_GLUE_WINDOWSMESSAGELOOP_H

// This file is only meant to compile on windows
#include <windows.h>

#include "base/basictypes.h"
#include "nsTraceRefCnt.h"

namespace mozilla {
namespace ipc {
namespace windows {

class DeferredMessage
{
public:
  DeferredMessage()
  {
    MOZ_COUNT_CTOR(DeferredMessage);
  }

  virtual ~DeferredMessage()
  {
    MOZ_COUNT_DTOR(DeferredMessage);
  }

  virtual void Run() = 0;
};

// Uses CallWndProc to deliver a message at a later time. Messages faked with
// this class must not have pointers in their wParam or lParam members as they
// may be invalid by the time the message actually runs.
class DeferredSendMessage : public DeferredMessage
{
public:
  DeferredSendMessage(HWND aHWnd,
                      UINT aMessage,
                      WPARAM aWParam,
                      LPARAM aLParam)
    : hWnd(aHWnd),
      message(aMessage),
      wParam(aWParam),
      lParam(aLParam)
  { }

  virtual void Run();

protected:
    HWND hWnd;
    UINT message;
    WPARAM wParam;
    LPARAM lParam;
};

// Uses RedrawWindow to fake several painting-related messages. Flags passed
// to the constructor go directly to RedrawWindow.
class DeferredRedrawMessage : public DeferredMessage
{
public:
  DeferredRedrawMessage(HWND aHWnd,
                        UINT aFlags)
    : hWnd(aHWnd),
      flags(aFlags)
  { }

  virtual void Run();

private:
  HWND hWnd;
  UINT flags;
};

// Uses UpdateWindow to generate a WM_PAINT message if needed.
class DeferredUpdateMessage : public DeferredMessage
{
public:
  DeferredUpdateMessage(HWND aHWnd)
    : hWnd(aHWnd)
  { }

  virtual void Run();

private:
  HWND hWnd;
};

// This class duplicates a string that may exist in the lParam member of the
// message.
class DeferredSettingChangeMessage : public DeferredSendMessage
{
public:
  DeferredSettingChangeMessage(HWND aHWnd,
                               UINT aMessage,
                               WPARAM aWParam,
                               LPARAM aLParam);

  ~DeferredSettingChangeMessage();
private:
  wchar_t* lParamString;
};

// This class uses SetWindowPos to fake various size-related messages. Flags
// passed to the constructor go straight through to SetWindowPos.
class DeferredWindowPosMessage : public DeferredMessage
{
public:
  DeferredWindowPosMessage(HWND aHWnd,
                           UINT aFlags)
   : hWnd(aHWnd),
     flags(aFlags)
  { }

  virtual void Run();

private:
  HWND hWnd;
  UINT flags;
};

class DeferredNCActivateMessage : public DeferredSendMessage
{
public:
  DeferredNCActivateMessage(HWND aHWnd,
                            UINT aMessage,
                            WPARAM aWParam,
                            LPARAM aLParam);

  ~DeferredNCActivateMessage();

private:
  HRGN region;
};

} /* namespace windows */
} /* namespace ipc */
} /* namespace mozilla */

#endif /* IPC_GLUE_WINDOWSMESSAGELOOP_H */