Test QListView using grid layout and dataChanged signal

testlist.cpp

#include <QApplication>
#include <QMainWindow>
#include <QLayout>
#include <QPushButton>
#include <QListView>
#include <QStringListModel>


class CustomModel : public QStringListModel {
  Q_OBJECT

public:
  CustomModel() {
    QStringList l;
    l << "this is a long word";
    l << "another word";
    setStringList(l);
  }

public slots:
  void testUpdate() {
    QModelIndex index = createIndex(0, 0);
    emit dataChanged(index, index);
  }
};

#include "testlist.moc"

int main(int argc, char *argv[]) {
  QApplication app(argc, argv);
  QMainWindow* w = new QMainWindow();

  QWidget* mainWidget = new QWidget();
  QBoxLayout* layout = new QBoxLayout(QBoxLayout::Direction::TopToBottom);

  QPushButton* button = new QPushButton();
  button -> setText("Update");

  CustomModel* model = new CustomModel();

  QObject::connect(button, SIGNAL(clicked()), model, SLOT(testUpdate()));

  QListView* list = new QListView();
  list -> setMovement(QListView::Static);
  list -> setResizeMode(QListView::Adjust);
  list -> setViewMode(QListView::IconMode);
  list -> setGridSize(QSize(30, 20));
  list -> setWrapping(true);
  list -> setWordWrap(true);

  list -> setModel(model);

  layout -> addWidget(button);
  layout -> addWidget(list);

  mainWidget -> setLayout(layout);
  w -> setCentralWidget(mainWidget);
  w -> show();

  return app.exec();
}