1 files changed, 135 insertions, 0 deletions
diff --git a/tests/manual/tasking/imagescaling/imagescaling.cpp b/tests/manual/tasking/imagescaling/imagescaling.cpp
new file mode 100644
index 0000000000..e3acda749b
--- /dev/null
+++ b/tests/manual/tasking/imagescaling/imagescaling.cpp
@@ -0,0 +1,135 @@
+// 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);
+        }
+    }
+}