text: // --------------------------------------------------------------------------
  //                   OpenMS -- Open-Source Mass Spectrometry
  // --------------------------------------------------------------------------
  // Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
  // ETH Zurich, and Freie Universitaet Berlin 2002-2021.
  //
  // 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: Chris Bielow $
  // $Authors: Chris Bielow $
  // --------------------------------------------------------------------------
  
  // OpenMS includes
  #include <OpenMS/VISUAL/OutputDirectory.h>
  #include <ui_OutputDirectory.h>
  
  
  #include <OpenMS/SYSTEM/File.h>
  
  #include <QtWidgets/QMessageBox>
  #include <QtWidgets/QFileDialog>
  #include <QtWidgets/QCompleter>
  #include <QtWidgets/QDirModel>
  
  
  namespace OpenMS
  {
    OutputDirectory::OutputDirectory(QWidget* parent)
      : QWidget(parent),
        ui_(new Ui::OutputDirectoryTemplate)
    {
      ui_->setupUi(this);
      QCompleter* completer = new QCompleter(this);
      QDirModel* dir_model = new QDirModel(completer);
      dir_model->setFilter(QDir::AllDirs);
      completer->setModel(dir_model);
      ui_->line_edit->setCompleter(completer);
  
      connect(ui_->browse_button, &QPushButton::clicked, this, &OutputDirectory::showFileDialog);
      connect(ui_->line_edit, &QLineEdit::textChanged, this, &OutputDirectory::textEditChanged_);
    }
  
    OutputDirectory::~OutputDirectory()
    {
      delete ui_;
    }
  
    void OutputDirectory::setDirectory(const QString& dir)
    {
      ui_->line_edit->setText(dir);
      emit directoryChanged(dir);
    }
  
    QString OutputDirectory::getDirectory() const
    {
      return ui_->line_edit->text();
    }
  
    void OutputDirectory::showFileDialog()
    {
      QString dir = File::exists(File::path(getDirectory())) ? File::path(getDirectory()).toQString() : "";
      QString selected_dir = QFileDialog::getExistingDirectory(this, tr("Select output directory"), dir);
      if (!selected_dir.isEmpty())
      {
        setDirectory(selected_dir); // emits directoryChanged()
      }
    }
    
    void OutputDirectory::textEditChanged_(const QString& /*new_text*/)
    {
      emit directoryChanged(getDirectory());
    }
    
  
    bool OutputDirectory::dirNameValid() const
    {
      if (!QFileInfo(getDirectory()).isDir())
      {
        return false;
      }
      QString file_name = getDirectory();
      if (!file_name.endsWith(QDir::separator()))
      {
        file_name += QDir::separator();
      }
      file_name += "test_file";
      return File::writable(file_name);
    }
  
  
  } // namespace
  