message_pump_qt.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

// Copyright (c) 2010 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 BASE_MESSAGE_PUMP_QT_H_

#define BASE_MESSAGE_PUMP_QT_H_

#include <qobject.h>

#include "base/message_pump.h"

#include "base/time.h"

class QTimer;

namespace base {

class MessagePumpForUI;

class MessagePumpQt : public QObject {

  Q_OBJECT

 public:

  MessagePumpQt(MessagePumpForUI& pump);

  ~MessagePumpQt();

  virtual bool event(QEvent* e);

  void scheduleDelayedIfNeeded(const TimeTicks& delayed_work_time);

 public Q_SLOTS:

  void dispatchDelayed();

 private:

  base::MessagePumpForUI& pump;

  QTimer* mTimer;

};

// This class implements a MessagePump needed for TYPE_UI MessageLoops on

// XP_LINUX platforms using QApplication event loop

class MessagePumpForUI : public MessagePump {

 public:

  MessagePumpForUI();

  ~MessagePumpForUI();

  virtual void Run(Delegate* delegate);

  virtual void Quit();

  virtual void ScheduleWork();

  virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time);

  // Internal methods used for processing the pump callbacks.  They are

  // public for simplicity but should not be used directly.

  // HandleDispatch is called after the poll has completed.

  void HandleDispatch();

 private:

  // We may make recursive calls to Run, so we save state that needs to be

  // separate between them in this structure type.

  struct RunState {

    Delegate* delegate;

    // Used to flag that the current Run() invocation should return ASAP.

    bool should_quit;

    // Used to count how many Run() invocations are on the stack.

    int run_depth;

};

  RunState* state_;

  // This is the time when we need to do delayed work.

  TimeTicks delayed_work_time_;

  // MessagePump implementation for Qt based on the GLib implement.

  // On Qt we use a QObject base class and the

  // default qApp in order to process events through QEventLoop.

  MessagePumpQt qt_pump;

  DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);

};

}  // namespace base

#endif  // BASE_MESSAGE_PUMP_QT_H_