qdebugstream.hpp

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#ifndef QDEBUGSTREAM_H_
#define QDEBUGSTREAM_H_
 
#include <iostream>
#include <streambuf>
#include <string>
#include "ers/ers.hpp"
#include <QTextEdit>
#include <QMutexLocker>
#include <QMutex>
#include <QEvent>
#include <QCoreApplication>
namespace daq {
namespace QTUtils {
 
class QDebugStream: public QObject, public std::basic_streambuf<char> {
    Q_OBJECT
public:
 
    QDebugStream(std::ostream &stream, QTextEdit* text_edit) :
    m_stream(stream) {
        m_mutex = new QMutex();
        log_window = text_edit;
        m_old_buf = stream.rdbuf();
        stream.rdbuf(this);
    }
    ~QDebugStream() {
        // output anything that is left
        if (!m_string.empty())
            log_window->append(m_string.c_str());
 
        m_stream.rdbuf(m_old_buf);
        delete m_mutex;
    }
 
protected:
    virtual int_type overflow(int_type v);
    virtual std::streamsize xsputn(const char *p, std::streamsize n);
    virtual bool event(QEvent* event);
private:
    std::ostream &m_stream;
    std::streambuf *m_old_buf;
    std::string m_string;
    QTextEdit* log_window;
    QMutex *m_mutex;
    QString m_text;
};
}
}
#endif /*QTEXTEDIT_H_*/