C
Telltales: Rendering Safety-Critical UI
// Copyright (C) 2024 The Qt Company Ltd. // SPDX-License-Identifier: LicenseRef-Qt-Commercial // This file is part of the Qt Safe Renderer module /* Purpose of this example is to enable development of Qt Safe Renderer in desktop environment (Windows and Linux). Note that this example is NOT implemented according Misra C++ 2008 nor ISO26262 functional safety standards and it depends on Qt classes. You should not use this example in production environment. */ #include <QtSafeRenderer/qsafelayout.h> #include <QtSafeRenderer/qsafelayoutresourcereader.h> #include <QtSafeRenderer/statemanager.h> #include <QtSafeRenderer/qsafechecksum.h> #include <QGuiApplication> #if defined(USE_OUTPUTVERIFIER) #include <outputverifier.h> #endif #include "safewindow.h" #include <QtSafeEventHandlerAdaptation/eventhandler.h> using namespace SafeRenderer; class CustomEventFilter : public QSafeEventFilter { public: CustomEventFilter(EventHandler* eventHandler) : m_eventHandlerPtr(eventHandler) {} // Don't use the ackReplyHandled so that the runtime handles ack reply for this message bool handleEvent(const QSafeEvent &event, [[maybe_unused]] bool *ackReplyHandled = nullptr) override { bool eventHandled = false; // Handle EventHeartbeatTimeout event if (m_eventHandlerPtr != nullptr && EventId::EventHeartbeatTimeout == event.getEventId()) { eventHandled = true; QSafeEventHeartbeatTimeout timeout(event); bool showNotif = timeout.getValue(); //Show or hide the error notification. QSafeEventVisibility notification; notification.setItemId(qsafe_hash_string("safeText")); notification.setValue(showNotif); m_eventHandlerPtr->processEvent(notification); } return eventHandled; } private: EventHandler *m_eventHandlerPtr = nullptr; }; static void hideIcons(StateManager &stateManager, QSafeLayout &layout) { for (quint32 i=0; i<layout.count(); i++) { if (layout.item(i).id() == qsafe_hash_string("speedText") ) { continue; } else if (layout.item(i).id() == qsafe_hash_string("turnleft") || layout.item(i).id() == qsafe_hash_string("turnright") ) { QSafeEventChangeState changeState; changeState.setItemId(layout.item(i).id()); changeState.setStateId(qsafe_hash_string("hidden")); stateManager.handleEvent(changeState); } else { QSafeEventVisibility hideItem; hideItem.setItemId(layout.item(i).id()); hideItem.setValue(0U); stateManager.handleEvent(hideItem); } } } int main(int argc, char **argv) { #ifdef HOST_BUILD // In host build when using QtGUI, we need to initialize QApplication before SafeWindow. QGuiApplication app(argc, argv); #endif static QSafeLayoutResourceReader hybrid; hybrid.readLayout("/layoutData/DashboardForm/DashboardForm.ui.srl"); static QSafeLayoutResourceReader sport; sport.readLayout("/layoutData/DashboardSportForm/DashboardSportForm.ui.srl"); hybrid.setLayoutId(qsafe_hash_string("hybrid")); sport.setLayoutId(qsafe_hash_string("sport")); SafeWindow telltaleWindow(hybrid.size(), QSafePoint(0U, 0U)); static StateManager stateManager(telltaleWindow, hybrid); stateManager.addLayout(&sport); hideIcons(stateManager, hybrid); telltaleWindow.requestUpdate(); #if defined(USE_OUTPUTVERIFIER) EventHandler msgHandler(stateManager, telltaleWindow, outputVerifier); #else EventHandler msgHandler(stateManager, telltaleWindow); #endif CustomEventFilter customEventFilter(&msgHandler); msgHandler.installSafeEventFilter(&customEventFilter); msgHandler.handleEvents(); return 0; }