QDS-11947 Clean cached user project

This MR brings the following features;

• fix: clean the cached user project when it's removed from the cloud
• chore: move QrScanner to it's own class
• chore: rename the source files

src/backend.cpp

@@ -24,25 +24,14 @@
 ****************************************************************************/
 
 #include "backend.h"
-#include "qapplication.h"
 
-#include <QCameraDevice>
 #include <QDesktopServices>
-#include <QElapsedTimer>
+#include <QEventLoop>
 #include <QFileInfo>
+#include <QGuiApplication>
 #include <QJsonArray>
 #include <QJsonObject>
-#include <QMediaDevices>
-#include <QMessageBox>
-#include <QPermission>
 #include <QSettings>
-#include <QSslSocket>
-#include <QVideoSink>
-#include <QtConcurrent>
-
-#include "../3rdparty/zxing-cpp/example/ZXingQtReader.h"
-
-using namespace ZXingQt;
 
 Backend::Backend(QObject *parent)
     : QObject(parent)
@@ -147,113 +136,13 @@ void Backend::updatePopup(const QString &text, bool indeterminate)
 
 void Backend::scanQrCode()
 {
-    // request permissions
-    QCameraPermission permission;
-    QCoreApplication &app = *QCoreApplication::instance();
-    switch (app.checkPermission(permission)) {
-    case Qt::PermissionStatus::Granted:
-        openCamera();
-        break;
-    case Qt::PermissionStatus::Undetermined:
-    case Qt::PermissionStatus::Denied:
-        app.requestPermission(permission, [this](const QPermission &permission) {
-            if (permission.status() == Qt::PermissionStatus::Denied) {
-                QMessageBox msgBox{QMessageBox::Critical,
-                                   "Critical:",
-                                   "Camera permission denied",
-                                   QMessageBox::Ok};
-                msgBox.exec();
-                return;
-            }
-
-            openCamera();
-        });
-        break;
-    }
-}
-
-void Backend::openCamera()
-{
-    // start camera
-    m_captureSession.reset(new QMediaCaptureSession(this));
-    m_captureSession->setCamera(new QCamera(this));
-    m_captureSession->setVideoOutput(new CustomVideoWidget);
-
-    m_captureSession->camera()->setFocusMode(QCamera::FocusModeAuto);
-
-    CustomVideoWidget *videoWidget = qobject_cast<CustomVideoWidget *>(
-        m_captureSession->videoOutput());
-
-    connect(m_captureSession->videoSink(),
-            &QVideoSink::videoFrameChanged,
-            this,
-            [&](const QVideoFrame &frame) {
-                static int i = 0;
-                static QAtomicInt running = 0;
-
-                if (i++ < 20 || running > 0) {
-                    return;
-                }
-
-                i = 0;
-
-                QtConcurrent::run([=] {
-                    // lock the thread so that only one barcode can be read at a time
-                    running++;
-
-                    QElapsedTimer timer;
-                    timer.start();
-                    QList<Result> results = ReadBarcodes(frame.toImage());
-                    qDebug() << "Barcode detection took" << timer.elapsed() << "ms";
-
-                    // release the lock so that another barcode can be read
-                    running--;
-                    return results;
-                }).then([=](const QList<Result> &results) {
-                    if (results.isEmpty() || !m_captureSession)
-                        return;
-
-                    qDebug() << "Stopping camera";
-                    qobject_cast<CustomVideoWidget *>(m_captureSession->videoOutput())->close();
-                    qDebug() << "Camera stopped";
-
-                    Result result = results.first();
-
-                    qDebug() << "Text:   " << result.text();
-                    qDebug() << "Format: " << result.format();
-                    qDebug() << "Content:" << result.contentType();
-
-                    // we have to use invokeMethod because we are in a different thread
-                    // then where the serviceConnector is created
-                    QMetaObject::invokeMethod(this,
-                                              "parseDesignViewerUrl",
-                                              Qt::QueuedConnection,
-                                              Q_ARG(QUrl, result.text()));
-                });
-            });
-
-    // stop camera when app is not active.
-    // i.e. when the user switches to another app or the screen is locked
-    QGuiApplication *app(qobject_cast<QGuiApplication *>(QCoreApplication::instance()));
-    connect(app, &QGuiApplication::applicationStateChanged, this, [&](Qt::ApplicationState state) {
-        if (state != Qt::ApplicationState::ApplicationActive && m_captureSession) {
-            qDebug() << "Application is not active. Stopping camera";
-            qobject_cast<CustomVideoWidget *>(m_captureSession->videoOutput())->close();
-        }
+    m_qrScanner.reset(new QrScanner);
+    connect(m_qrScanner.data(), &QrScanner::qrCodeScanned, this, [&](const QString &qrCode) {
+        qDebug() << "QR code scanned:" << qrCode;
+        parseDesignViewerUrl(QUrl(qrCode));
+        m_qrScanner.reset();
     });
-
-    // stop camera when video widget is closed
-    connect(videoWidget, &CustomVideoWidget::closed, this, [&] {
-        qDebug() << "Video widget closed. Clearing capture session";
-        m_captureSession->camera()->stop();
-        m_captureSession->camera()->deleteLater();
-        m_captureSession->videoOutput()->deleteLater();
-        m_captureSession.clear();
-    });
-
-    videoWidget->setWindowFlags(Qt::Window | Qt::WindowStaysOnTopHint);
-    videoWidget->show();
-    m_captureSession->camera()->start();
+    m_qrScanner->scanQrCode();
 }
 
 void Backend::initializeProjectManager()
@@ -382,9 +271,7 @@ void Backend::clearDemoCaches()
 {
     emit popupOpen();
     updatePopup("Clearing demo caches...");
-    m_projectManager.reset(new ProjectManager);
-    m_projectManager->clearDemoCaches();
-    m_projectManager.reset();
+    ProjectManager().clearDemoCaches();
     emit popupClose();
 }
 
@@ -500,6 +387,16 @@ void Backend::updateUserProjectList()
             const QString projectName{project.toObject().value("appName").toString()};
             qDebug() << "--" << projectName;
         }
+
+        // check if any project is removed on the cloud
+        for (const auto &project : m_projectList) {
+            const QString projectName{project.toObject().value("appName").toString()};
+            if (!projectList.value().contains(project)) {
+                qDebug() << "Project removed:" << projectName << ". Removing from cache...";
+                // remove the project from the cache
+                ProjectManager().clearCachedProject(project.toObject());
+            }
+        }
     }
 
     // we need to set m_projectList even if it is empty