qt-everywhere-src-5.14.1/qtbase/examples/widgets/itemviews/fetchmore/window.cpp

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#include "window.h"
#include "filelistmodel.h"

#include <QtWidgets>

Window::Window(QWidget *parent)
    : QWidget(parent)
{
    FileListModel *model = new FileListModel(this);
    model->setDirPath(QLibraryInfo::location(QLibraryInfo::PrefixPath));

    QLabel *label = new QLabel(tr("&Directory:"));
    QLineEdit *lineEdit = new QLineEdit;
    label->setBuddy(lineEdit);

    QListView *view = new QListView;
    view->setModel(model);

    logViewer = new QTextBrowser(this);
    logViewer->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));

    connect(lineEdit, &QLineEdit::textChanged,
            model, &FileListModel::setDirPath);
    connect(lineEdit, &QLineEdit::textChanged,
            logViewer, &QTextEdit::clear);
    connect(model, &FileListModel::numberPopulated,
            this, &Window::updateLog);

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(label, 0, 0);
    layout->addWidget(lineEdit, 0, 1);
    layout->addWidget(view, 1, 0, 1, 2);
    layout->addWidget(logViewer, 2, 0, 1, 2);

    setLayout(layout);
    setWindowTitle(tr("Fetch More Example"));
}

void Window::updateLog(int number)
{
    logViewer->append(tr("%1 items added.").arg(number));
}