qml: Add message box for InitError calls

Author: hebasto

src/qml/bitcoin.cpp

@@ -32,6 +32,18 @@ void SetupUIArgs(ArgsManager& argsman)
     argsman.AddArg("-resetguisettings", "Reset all settings changed in the GUI", ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
     argsman.AddArg("-splash", strprintf("Show splash screen on startup (default: %u)", DEFAULT_SPLASHSCREEN), ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
 }
+
+bool InitErrorMessageBox(
+    const bilingual_str& message,
+    [[maybe_unused]] const std::string& caption,
+    [[maybe_unused]] unsigned int style)
+{
+    QQmlApplicationEngine engine;
+    engine.rootContext()->setContextProperty("message", QString::fromStdString(message.translated));
+    engine.load(QUrl(QStringLiteral("qrc:///qml/pages/initerrormessage.qml")));
+    qGuiApp->exec();
+    return false;
+}
 } // namespace
 
 
@@ -42,6 +54,8 @@ int QmlGuiMain(int argc, char* argv[])
     QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
 
+    auto handler_message_box = ::uiInterface.ThreadSafeMessageBox_connect(InitErrorMessageBox);
+
     // Parse command-line options. We do this after qt in order to show an error if there are problems parsing these.
     SetupServerArgs(gArgs);
     SetupUIArgs(gArgs);
@@ -68,6 +82,8 @@ int QmlGuiMain(int argc, char* argv[])
     std::unique_ptr<interfaces::Node> node = interfaces::MakeNode(&node_context);
     node->baseInitialize();
 
+    handler_message_box.disconnect();
+
     NodeModel node_model;
     InitExecutor init_executor{*node};
     QObject::connect(&node_model, &NodeModel::requestedInitialize, &init_executor, &InitExecutor::initialize);

src/qml/bitcoin_qml.qrc

@@ -1,5 +1,6 @@
 <!DOCTYPE RCC><RCC version="1.0">
     <qresource prefix="/qml">
+        <file>pages/initerrormessage.qml</file>
         <file>pages/stub.qml</file>
     </qresource>
 </RCC>

src/qml/pages/initerrormessage.qml

@@ -0,0 +1,10 @@
+import QtQuick 2.12
+import QtQuick.Dialogs 1.3
+
+MessageDialog {
+    id: messageDialog
+    title: "Bitcoin Core TnG"
+    text: message
+    onAccepted: Qt.quit()
+    Component.onCompleted: visible = true
+}