QmitkRun.h

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/*============================================================================
 
The Medical Imaging Interaction Toolkit (MITK)
 
Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.
 
Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.
 
============================================================================*/
 
#ifndef QmitkRun_h
#define QmitkRun_h
 
#include <MitkQtWidgetsExports.h>
 
#include <QEventLoop>
#include <QFutureWatcher>
#include <QProgressDialog>
#include <QString>
#include <QWidget>
 
#include <QtConcurrent>
 
#include <exception>
#include <functional>
 
template<typename T>
T QmitkRunAsyncBlocking(const QString& title, const QString& label, std::function<T()> task)
{
  QProgressDialog dialog(label, {}, 0, 0);
  dialog.setWindowModality(Qt::ApplicationModal);
  dialog.setWindowTitle(title);
  dialog.setMinimumDuration(250);
  dialog.show();
 
  T result{};
  std::exception_ptr exception;
 
  auto future = QtConcurrent::run([&]() -> T {
    try
    {
      return task();
    }
    catch (...)
    {
      exception = std::current_exception();
      return T{};
    }
  });
 
  QFutureWatcher<T> watcher;
  QEventLoop loop;
 
  QObject::connect(&watcher, &QFutureWatcher<T>::finished, [&]() {
    result = watcher.result();
    dialog.close();
    loop.quit();
  });
 
  watcher.setFuture(future);
  loop.exec();
 
  if (exception)
    std::rethrow_exception(exception);
 
  return result;
}
 
MITKQTWIDGETS_EXPORT void QmitkRunAsyncBlocking(const QString& title, const QString& label, std::function<void()> task);
 
#endif