/usr/include/qgis/qgscontexthelp.h is in libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1.
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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
/** \ingroup core
* Provides a context based help browser for a dialog.
*
* The help text is stored in SQLite and accessed by a context identifier
* unique to each dialog. This is a singleton class which invokes the help
* viewer using QProcess and ensures that only one viewer is open.
* The viewer will be terminated if open when the main application quits.
*
* If the compile-time flag QGSCONTEXTHELP_REUSE is defined, the help viewer
* will be reused if it is still open. If this flag is not set, the viewer
* process will be terminated if open and restarted; this makes it the top
* window for window managers such as Linux/GNOME which will make a window
* active but not bring it to the top if raised programatically.
*/
class CORE_EXPORT QgsContextHelp : public QObject
{
Q_OBJECT
public:
static void run( QString context );
private slots:
void readPort();
void processExited();
private:
//! Constructor
QgsContextHelp( QString context );
//! Destructor
~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
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