Method ConfirmCancel

Modules/PythonInstallerUI/src/QmitkPipInstallDialog.cpp:312–354

}

bool QmitkPipInstallDialog::ConfirmCancel()
{
  auto answer = QMessageBox::question(
    this,
    "Cancel installation",
    "<p>The installation is still in progress. "
    "Closing now will cancel the installation and remove all already installed packages.</p>"
    "<p>Cancel anyway?</p>");

  if (answer == QMessageBox::No)
    return false;

  m_IsCancelling = true;

  // Show that a cancel is in progress and prevent further interaction while
  // pip is being killed and the venv torn down.
  m_DotTimer->stop();
  this->SetTerminalStatus("Cancelling installation...");
  m_Ui->packageLabel->hide();
  m_Ui->progressBar->hide();
  m_Ui->buttonBox->setEnabled(false);

  // Spin a local event loop so the dialog stays alive until FinalizeCancel
  // has run (it removes the venv that we created) and emits InstallFinished.
  // Without this, the dialog would close as soon as ConfirmCancel returned
  // and the engine would be destroyed before OnProcessFinished could fire.
  //
  // Safety cap: if the pip kill or the venv removal wedges (AV holding files
  // open, zombie subprocess on Windows, etc.), quit the loop after 30 s so
  // the dialog can close instead of locking forever. A legitimate
  // fs::remove_all is comfortably inside that envelope even on a slow disk.
  // Queued connection so the synchronous Cancel() path (no QProcess running)
  // that emits InstallFinished directly from inside Cancel() still reaches
  // the loop: the queued slot is posted as an event and delivered once
  // loop.exec() starts spinning.
  QEventLoop loop;
  connect(m_Installer, &QmitkPipInstaller::InstallFinished, &loop, &QEventLoop::quit, Qt::QueuedConnection);
  QTimer::singleShot(30000, &loop, &QEventLoop::quit);
  m_Installer->Cancel();
  loop.exec();

  return true;
}

void QmitkPipInstallDialog::SetUiInstalling()
{