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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "imagescaling.h"
#include "downloaddialog.h"
#include <tasking/concurrentcall.h>
#include <tasking/networkquery.h>
using namespace Tasking;
Images::Images(QWidget *parent) : QWidget(parent), downloadDialog(new DownloadDialog(this))
{
resize(800, 600);
QPushButton *addUrlsButton = new QPushButton(tr("Add URLs"));
connect(addUrlsButton, &QPushButton::clicked, this, &Images::process);
cancelButton = new QPushButton(tr("Cancel"));
cancelButton->setEnabled(false);
connect(cancelButton, &QPushButton::clicked, this, [this] {
statusBar->showMessage(tr("Canceled."));
taskTree.reset();
});
QHBoxLayout *buttonLayout = new QHBoxLayout();
buttonLayout->addWidget(addUrlsButton);
buttonLayout->addWidget(cancelButton);
buttonLayout->addStretch();
statusBar = new QStatusBar();
imagesLayout = new QGridLayout();
mainLayout = new QVBoxLayout();
mainLayout->addLayout(buttonLayout);
mainLayout->addLayout(imagesLayout);
mainLayout->addStretch();
mainLayout->addWidget(statusBar);
setLayout(mainLayout);
}
static void scale(QPromise<QImage> &promise, const QByteArray &data)
{
const auto image = QImage::fromData(data);
if (image.isNull())
promise.future().cancel();
else
promise.addResult(image.scaled(100, 100, Qt::KeepAspectRatio));
}
void Images::process()
{
if (downloadDialog->exec() != QDialog::Accepted)
return;
const auto urls = downloadDialog->getUrls();
initLayout(urls.size());
const auto onRootSetup = [this] {
statusBar->showMessage(tr("Downloading and Scaling..."));
cancelButton->setEnabled(true);
};
const auto onRootDone = [this] {
statusBar->showMessage(tr("Finished."));
cancelButton->setEnabled(false);
};
QList<GroupItem> tasks {
finishAllAndDone,
parallel,
onGroupSetup(onRootSetup),
onGroupDone(onRootDone)
};
int i = 0;
for (const QUrl &url : urls) {
TreeStorage<QByteArray> storage;
const auto onDownloadSetup = [this, url](NetworkQuery &query) {
query.setNetworkAccessManager(&qnam);
query.setRequest(QNetworkRequest(url));
};
const auto onDownloadDone = [storage](const NetworkQuery &query) {
*storage = query.reply()->readAll();
};
const auto onDownloadError = [this, i](const NetworkQuery &query) {
labels[i]->setText(tr("Download\nError.\nCode: %1.").arg(query.reply()->error()));
};
const auto onScalingSetup = [storage](ConcurrentCall<QImage> &data) {
data.setConcurrentCallData(&scale, *storage);
};
const auto onScalingDone = [this, i](const ConcurrentCall<QImage> &data) {
labels[i]->setPixmap(QPixmap::fromImage(data.result()));
};
const auto onScalingError = [this, i](const ConcurrentCall<QImage> &) {
labels[i]->setText(tr("Image\nData\nError."));
};
const Group group {
Storage(storage),
NetworkQueryTask(onDownloadSetup, onDownloadDone, onDownloadError),
ConcurrentCallTask<QImage>(onScalingSetup, onScalingDone, onScalingError)
};
tasks.append(group);
++i;
}
taskTree.reset(new TaskTree(tasks));
connect(taskTree.get(), &TaskTree::done, this, [this] { taskTree.release()->deleteLater(); });
taskTree->start();
}
void Images::initLayout(qsizetype count)
{
// Clean old images
QLayoutItem *child;
while ((child = imagesLayout->takeAt(0)) != nullptr) {
child->widget()->setParent(nullptr);
delete child->widget();
delete child;
}
labels.clear();
// Init the images layout for the new images
const auto dim = int(qSqrt(qreal(count))) + 1;
for (int i = 0; i < dim; ++i) {
for (int j = 0; j < dim; ++j) {
QLabel *imageLabel = new QLabel;
imageLabel->setFixedSize(100, 100);
imageLabel->setAlignment(Qt::AlignCenter);
imagesLayout->addWidget(imageLabel, i, j);
labels.append(imageLabel);
}
}
}
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