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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtWidgets/QtWidgets>
#include <emscripten/val.h>
#include <emscripten.h>
class AppWindow : public QObject
{
Q_OBJECT
public:
AppWindow() : m_layout(new QVBoxLayout(&m_loadFileUi)),
m_window(emscripten::val::global("window")),
m_showOpenFilePickerFunction(m_window["showOpenFilePicker"]),
m_showSaveFilePickerFunction(m_window["showSaveFilePicker"])
{
addWidget<QLabel>("Filename filter");
const bool localFileApiAvailable =
!m_showOpenFilePickerFunction.isUndefined() && !m_showSaveFilePickerFunction.isUndefined();
m_useLocalFileApisCheckbox = addWidget<QCheckBox>("Use the window.showXFilePicker APIs");
m_useLocalFileApisCheckbox->setEnabled(localFileApiAvailable);
m_useLocalFileApisCheckbox->setChecked(localFileApiAvailable);
m_filterEdit = addWidget<QLineEdit>("Images (*.png *.jpg);;PDF (*.pdf);;*.txt");
auto* loadFile = addWidget<QPushButton>("Load File");
m_fileInfo = addWidget<QLabel>("Opened file:");
m_fileInfo->setTextInteractionFlags(Qt::TextSelectableByMouse);
m_fileHash = addWidget<QLabel>("Sha256:");
m_fileHash->setTextInteractionFlags(Qt::TextSelectableByMouse);
addWidget<QLabel>("Saved file name");
m_savedFileNameEdit = addWidget<QLineEdit>("qttestresult");
m_saveFile = addWidget<QPushButton>("Save File");
m_saveFile->setEnabled(false);
m_layout->addStretch();
m_loadFileUi.setLayout(m_layout);
QObject::connect(m_useLocalFileApisCheckbox, &QCheckBox::toggled, std::bind(&AppWindow::onUseLocalFileApisCheckboxToggled, this));
QObject::connect(loadFile, &QPushButton::clicked, this, &AppWindow::onLoadClicked);
QObject::connect(m_saveFile, &QPushButton::clicked, std::bind(&AppWindow::onSaveClicked, this));
}
void show() {
m_loadFileUi.show();
}
~AppWindow() = default;
private Q_SLOTS:
void onUseLocalFileApisCheckboxToggled()
{
m_window.set("showOpenFilePicker",
m_useLocalFileApisCheckbox->isChecked() ?
m_showOpenFilePickerFunction : emscripten::val::undefined());
m_window.set("showSaveFilePicker",
m_useLocalFileApisCheckbox->isChecked() ?
m_showSaveFilePickerFunction : emscripten::val::undefined());
}
void onFileContentReady(const QString &fileName, const QByteArray &fileContents)
{
m_fileContent = fileContents;
m_fileInfo->setText(QString("Opened file: %1 size: %2").arg(fileName).arg(fileContents.size()));
m_saveFile->setEnabled(true);
QTimer::singleShot(100, this, &AppWindow::computeAndDisplayFileHash); // update UI before computing hash
}
void computeAndDisplayFileHash()
{
QByteArray hash = QCryptographicHash::hash(m_fileContent, QCryptographicHash::Sha256);
m_fileHash->setText(QString("Sha256: %1").arg(QString(hash.toHex())));
}
void onFileSaved(bool success)
{
m_fileInfo->setText(QString("File save result: %1").arg(success ? "success" : "failed"));
}
void onLoadClicked()
{
QFileDialog::getOpenFileContent(
m_filterEdit->text(),
std::bind(&AppWindow::onFileContentReady, this, std::placeholders::_1, std::placeholders::_2));
}
void onSaveClicked()
{
m_fileInfo->setText("Saving file... (no result information with current API)");
QFileDialog::saveFileContent(m_fileContent, m_savedFileNameEdit->text());
}
private:
template <class T, class... Args>
T* addWidget(Args... args)
{
T* widget = new T(std::forward<Args>(args)..., &m_loadFileUi);
m_layout->addWidget(widget);
return widget;
}
QWidget m_loadFileUi;
QCheckBox* m_useLocalFileApisCheckbox;
QLineEdit* m_filterEdit;
QVBoxLayout *m_layout;
QLabel* m_fileInfo;
QLabel* m_fileHash;
QLineEdit* m_savedFileNameEdit;
QPushButton* m_saveFile;
emscripten::val m_window;
emscripten::val m_showOpenFilePickerFunction;
emscripten::val m_showSaveFilePickerFunction;
QByteArray m_fileContent;
};
int main(int argc, char **argv)
{
QApplication application(argc, argv);
AppWindow window;
window.show();
return application.exec();
}
#include "main.moc"
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