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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtWidgets/QtWidgets>
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QByteArray content;
QWidget loadFileUi;
QVBoxLayout *layout = new QVBoxLayout();
QPushButton *loadFile = new QPushButton("Load File");
QLabel *fileInfo = new QLabel("Opened file:");
fileInfo->setTextInteractionFlags(Qt::TextSelectableByMouse);
QLabel *fileHash = new QLabel("Sha256:");
fileHash->setTextInteractionFlags(Qt::TextSelectableByMouse);
QPushButton *saveFile = new QPushButton("Save File");
saveFile->setEnabled(false);
auto onFileReady = [=, &content](const QString &fileName, const QByteArray &fileContents) {
content = fileContents;
fileInfo->setText(QString("Opened file: %1 size: %2").arg(fileName).arg(fileContents.size()));
saveFile->setEnabled(true);
auto computeDisplayFileHash = [=](){
QByteArray hash = QCryptographicHash::hash(fileContents, QCryptographicHash::Sha256);
fileHash->setText(QString("Sha256: %1").arg(QString(hash.toHex())));
};
QTimer::singleShot(100, computeDisplayFileHash); // update UI before computing hash
};
auto onLoadClicked = [=](){
QFileDialog::getOpenFileContent("*.*", onFileReady);
};
QObject::connect(loadFile, &QPushButton::clicked, onLoadClicked);
auto onSaveClicked = [=, &content]() {
QFileDialog::saveFileContent(content, "qtsavefiletest.dat");
};
QObject::connect(saveFile, &QPushButton::clicked, onSaveClicked);
layout->addWidget(loadFile);
layout->addWidget(fileInfo);
layout->addWidget(fileHash);
layout->addWidget(saveFile);
layout->addStretch();
loadFileUi.setLayout(layout);
loadFileUi.show();
return app.exec();
}
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