src/core/qgscontexthelp.h

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/***************************************************************************
                          qgscontexthelp.h
               Display context help for a dialog by invoking the
                                 QgsHelpViewer
                             -------------------
    begin                : 2005-06-19
    copyright            : (C) 2005 by Gary E.Sherman
    email                : sherman at mrcc.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
/* $Id$ */
#ifndef QGSCONTEXTHELP_H
#define QGSCONTEXTHELP_H
#include <QObject>

class QProcess;
class QTcpSocket;

#ifdef Q_OS_MACX
#define QGSCONTEXTHELP_REUSE 1
#endif

class CORE_EXPORT QgsContextHelp : public QObject
{
    Q_OBJECT
  public:
    static void run( QString context );

  private slots:
    void readPort();
    void processExited();

  private:
    QgsContextHelp( QString context );
    ~QgsContextHelp();

    QProcess *start( QString context );
    void showContext( QString context );

    static QgsContextHelp *gContextHelp; // Singleton instance
    QProcess *mProcess;
#ifdef QGSCONTEXTHELP_REUSE
    // Communications socket when reusing existing process
    QTcpSocket *mSocket;
#else
    // Replacement process when terminating and restarting
    QProcess *mNextProcess;
#endif
};

#endif //QGSCONTEXTHELP_H