QFileInfo is very slow

[wysota]

I have three listWidgets where I need to add these three arrays.

It would be much better to have three listViews each serving a separate column from a single model based on QFileInfoList.

Something along the lines of:

#include <QtWidgets>
 
class InfoListModel : public QAbstractTableModel {
public:
  InfoListModel(const QFileInfoList &list, QObject *parent = 0) : QAbstractTableModel(parent), m_data(list) {}
  int rowCount(const QModelIndex &parent = QModelIndex()) const { return parent.isValid() ? 0 : m_data.size(); }
  int columnCount(const QModelIndex &parent = QModelIndex()) const { return 3; }
  QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const {
    if(!hasIndex(index.row(), index.column(), index.parent())) return QVariant();
    if(role != Qt::DisplayRole) return QVariant();
    const QFileInfo &finfo = m_data.at(index.row());
    switch(index.column()) {
      case 0: return finfo.fileName();
      case 1: return finfo.lastModified().toString("dd/MM/yyyy hh:mm:ss");
      case 2: return finfo.size();
      default: return QVariant();
    }
  }  
private:
  QFileInfoList m_data;
};
 
int main(int argc, char **argv) {
  QApplication app(argc, argv);
  QFileInfoList list = QDir(argv[1]).entryInfoList(QDir::Files|QDir::NoDotAndDotDot);
  InfoListModel model(list);
  QListView l1;
  QListView l2;
  QListView l3;
  l1.setModel(&model);
  l2.setModel(&model);
  l3.setModel(&model);
  l1.setModelColumn(0);
  l2.setModelColumn(1);
  l3.setModelColumn(2);
  l1.show();
  l2.show();
  l3.show();
  return app.exec();
}

#include <QtWidgets>

class InfoListModel : public QAbstractTableModel {
public:
  InfoListModel(const QFileInfoList &list, QObject *parent = 0) : QAbstractTableModel(parent), m_data(list) {}
  int rowCount(const QModelIndex &parent = QModelIndex()) const { return parent.isValid() ? 0 : m_data.size(); }
  int columnCount(const QModelIndex &parent = QModelIndex()) const { return 3; }
  QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const {
    if(!hasIndex(index.row(), index.column(), index.parent())) return QVariant();
    if(role != Qt::DisplayRole) return QVariant();
    const QFileInfo &finfo = m_data.at(index.row());
    switch(index.column()) {
      case 0: return finfo.fileName();
      case 1: return finfo.lastModified().toString("dd/MM/yyyy hh:mm:ss");
      case 2: return finfo.size();
      default: return QVariant();
    }
  }  
private:
  QFileInfoList m_data;
};

int main(int argc, char **argv) {
  QApplication app(argc, argv);
  QFileInfoList list = QDir(argv[1]).entryInfoList(QDir::Files|QDir::NoDotAndDotDot);
  InfoListModel model(list);
  QListView l1;
  QListView l2;
  QListView l3;
  l1.setModel(&model);
  l2.setModel(&model);
  l3.setModel(&model);
  l1.setModelColumn(0);
  l2.setModelColumn(1);
  l3.setModelColumn(2);
  l1.show();
  l2.show();
  l3.show();
  return app.exec();
}

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And there is also QFileSystemModel.