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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file Background-progress
* A Progress object that reports progress thread-safely over a Channel.
*/
#ifndef INKSCAPE_ASYNC_BACKGROUND_PROGRESS_H
#define INKSCAPE_ASYNC_BACKGROUND_PROGRESS_H
#include <functional>
#include "channel.h"
#include "progress.h"
namespace Inkscape {
namespace Async {
template <typename... T>
class BackgroundProgress final
: public Progress<T...>
{
public:
/**
* Construct a Progress object which becomes cancelled as soon as \a channel is closed,
* and reports progress by calling \a onprogress over \a channel.
*
* The result can only be used within the lifetime of \a channel.
*/
BackgroundProgress(Channel::Source &channel, std::function<void(T...)> &onprogress)
: channel(&channel)
, onprogress(std::move(onprogress)) {}
private:
Channel::Source *channel;
std::function<void(T...)> onprogress;
bool _keepgoing() const override { return channel->operator bool(); }
bool _report(T const &... progress) override { return channel->run(std::bind(onprogress, progress...)); }
};
} // namespace Async
} // namespace Inkscape
#endif // INKSCAPE_ASYNC_BACKGROUND_PROGRESS_H
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