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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Base RAII blocker for sgic++ signals.
*
* Authors:
* Jon A. Cruz <jon@joncruz.org>
*
* Copyright (C) 2014 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef SEEN_INKSCAPE_UTIL_SIGNAL_BLOCKER_H
#define SEEN_INKSCAPE_UTIL_SIGNAL_BLOCKER_H
#include <string>
#include <sigc++/connection.h>
/**
* Base RAII blocker for sgic++ signals.
*/
class SignalBlocker
{
public:
/**
* Creates a new instance that if the signal is currently unblocked will block
* it until this instance is destructed and then will unblock it.
*/
SignalBlocker( sigc::connection *connection ) :
_connection(connection),
_wasBlocked(_connection->blocked())
{
if (!_wasBlocked)
{
_connection->block();
}
}
/**
* Destructor that will unblock the signal if it was blocked initially by this
* instance.
*/
~SignalBlocker()
{
if (!_wasBlocked)
{
_connection->block(false);
}
}
private:
// noncopyable, nonassignable
SignalBlocker(SignalBlocker const &other) = delete;
SignalBlocker& operator=(SignalBlocker const &other) = delete;
sigc::connection *_connection;
bool _wasBlocked;
};
#endif // SEEN_INKSCAPE_UTIL_SIGNAL_BLOCKER_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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