selectlistdialog.h

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#ifndef SELECT_FROM_LIST_DIALOG_H
#define SELECT_FROM_LIST_DIALOG_H

#include <QDialog>
#include <deque>
#include "ui_selectlistdialog.h"

namespace Ui
{
class SelectFromListDialog;
}

class SelectFromListDialog : public QDialog
{
  Q_OBJECT

public:
  explicit SelectFromListDialog(const std::deque<std::string>& fields, bool single_selection = true,
                                QWidget* parent = 0);
  ~SelectFromListDialog();

  std::vector<int> getSelectedRowNumber() const;

private slots:
  void on_buttonBox_accepted();

  void on_listFieldsWidget_currentRowChanged(int currentRow);

  void on_listFieldsWidget_doubleClicked(const QModelIndex& index);

  void on_pushButtonSelectAll_pressed();

  void on_listFieldsWidget_clicked(const QModelIndex& index);

private:
  Ui::SelectXAxisDialog* ui;
  std::vector<int> _selected_row_number;
  bool _single_selection;
};

//-----------------------------------------------
inline SelectFromListDialog::SelectFromListDialog(const std::deque<std::string>& fields, bool single_selection,
                                                  QWidget* parent)
  : QDialog(parent), ui(new Ui::SelectXAxisDialog), _single_selection(single_selection)
{
  auto flags = this->windowFlags();
  this->setWindowFlags(flags | Qt::WindowStaysOnTopHint);

  ui->setupUi(this);

  if (!_single_selection)
  {
    ui->listFieldsWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
  }
  else
  {
    ui->pushButtonSelectAll->hide();
  }

  // if there is only one item in the list, select it by default
  for (int i = 0; i < fields.size(); i++)
  {
    auto item = new QListWidgetItem(QString::fromStdString(fields[i]));
    ui->listFieldsWidget->addItem(item);

    if (fields.size() == 1)
    {
      item->setSelected(true);
    }
  }
}

inline SelectFromListDialog::~SelectFromListDialog()
{
  delete ui;
}

inline std::vector<int> SelectFromListDialog::getSelectedRowNumber() const
{
  return _selected_row_number;
}

inline void SelectFromListDialog::on_listFieldsWidget_clicked(const QModelIndex& index)
{
  QModelIndexList indexes = ui->listFieldsWidget->selectionModel()->selectedIndexes();
  ui->buttonBox->setEnabled(indexes.empty() == false);
}

inline void SelectFromListDialog::on_buttonBox_accepted()
{
  QModelIndexList indexes = ui->listFieldsWidget->selectionModel()->selectedIndexes();

  foreach (QModelIndex index, indexes)
  {
    _selected_row_number.push_back(index.row());
  }
}

inline void SelectFromListDialog::on_listFieldsWidget_currentRowChanged(int)
{
  QModelIndexList indexes = ui->listFieldsWidget->selectionModel()->selectedIndexes();
  ui->buttonBox->setEnabled(indexes.empty() == false);
}

inline void SelectFromListDialog::on_listFieldsWidget_doubleClicked(const QModelIndex&)
{
  if (_single_selection)
  {
    _selected_row_number.push_back(ui->listFieldsWidget->currentRow());
    this->accept();
  }
}

inline void SelectFromListDialog::on_pushButtonSelectAll_pressed()
{
  for (int i = 0; i < ui->listFieldsWidget->count(); i++)
  {
    _selected_row_number.push_back(i);
  }
  this->accept();
}

#endif  // SELECTXAXISDIALOG_H