text: // --------------------------------------------------------------------------
  //                   OpenMS -- Open-Source Mass Spectrometry
  // --------------------------------------------------------------------------
  // Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
  // ETH Zurich, and Freie Universitaet Berlin 2002-2017.
  //
  // This software is released under a three-clause BSD license:
  //  * Redistributions of source code must retain the above copyright
  //    notice, this list of conditions and the following disclaimer.
  //  * Redistributions in binary form must reproduce the above copyright
  //    notice, this list of conditions and the following disclaimer in the
  //    documentation and/or other materials provided with the distribution.
  //  * Neither the name of any author or any participating institution
  //    may be used to endorse or promote products derived from this software
  //    without specific prior written permission.
  // For a full list of authors, refer to the file AUTHORS.
  // --------------------------------------------------------------------------
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL ANY OF THE AUTHORS OR THE CONTRIBUTING
  // INSTITUTIONS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  // --------------------------------------------------------------------------
  // $Maintainer: Johannes Veit $
  // $Authors: Johannes Junker $
  // --------------------------------------------------------------------------
  
  // OpenMS includes
  #include <OpenMS/VISUAL/DIALOGS/TOPPASInputFileDialog.h>
  
  #include <QtGui/QMessageBox>
  #include <QtGui/QFileDialog>
  #include <QtGui/QCompleter>
  #include <QtGui/QDirModel>
  #include <QtCore/QFileInfo>
  
  #include <iostream>
  
  namespace OpenMS
  {
    TOPPASInputFileDialog::TOPPASInputFileDialog(const QString & file_name)
    {
      setupUi(this);
  
      line_edit->setText(file_name);
      // disable completer for windows, causes crashes
  #ifndef OPENMS_WINDOWSPLATFORM
      QCompleter * completer = new QCompleter(this);
      completer->setModel(new QDirModel(completer));
      line_edit->setCompleter(completer);
  #endif
      connect(browse_button, SIGNAL(clicked()), this, SLOT(showFileDialog()));
      connect(ok_button, SIGNAL(clicked()), this, SLOT(checkValidity_()));
      connect(cancel_button, SIGNAL(clicked()), this, SLOT(reject()));
    }
  
    void TOPPASInputFileDialog::showFileDialog()
    {
      QString file_name = QFileDialog::getOpenFileName(this, tr("Specify input file"), tr(""), tr(/*valid formats*/ ""));
      if (file_name != "")
      {
        line_edit->setText(file_name);
      }
    }
  
    QString TOPPASInputFileDialog::getFilename()
    {
      return line_edit->text();
    }
  
    void TOPPASInputFileDialog::checkValidity_()
    {
      // we ALLOW non-existing filenames (e.g. for FASTA files, which
      // are searched in other paths via OpenMS.ini:id_db_dir
      if (!fileNameValid(line_edit->text()))
      {
        QMessageBox::warning(nullptr, "Invalid file name", "Warning: filename does not exist!");
      }
  
      accept();
    }
  
    bool TOPPASInputFileDialog::fileNameValid(const QString & file_name)
    {
      QFileInfo fi(file_name);
      return fi.exists() && fi.isReadable() && (!fi.isDir());
    }
  
  } // namespace
  