Port back to Qt 5.

To be consistent in app launching, port back to Qt 5. Also, bump the C++ standard to 23, well, just because, and make the installer prompt display on both monitors, instead of just one.

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.22)
 
-project(lubuntu-installer-prompt VERSION 0.3.0 LANGUAGES CXX)
+project(lubuntu-installer-prompt VERSION 1.0.0 LANGUAGES CXX)
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
@@ -8,10 +8,10 @@ set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt6 REQUIRED COMPONENTS Core Widgets)
+find_package(Qt5 REQUIRED COMPONENTS Core Widgets)
 
 include_directories(${PROJECT_SOURCE_DIR}/src)
 
@@ -21,14 +21,9 @@ file(GLOB PROJECT_SOURCES
     "${PROJECT_SOURCE_DIR}/src/*.ui"
 )
 
-qt_add_executable(lubuntu-installer-prompt
-    MANUAL_FINALIZATION
-    ${PROJECT_SOURCES}
-)
-
-target_link_libraries(lubuntu-installer-prompt PRIVATE Qt6::Widgets)
+add_executable(lubuntu-installer-prompt ${PROJECT_SOURCES})
 
-qt_finalize_executable(lubuntu-installer-prompt)
+target_link_libraries(lubuntu-installer-prompt Qt5::Widgets)
 
 install(TARGETS lubuntu-installer-prompt DESTINATION bin)
 install(PROGRAMS "scripts/lubuntu-installer" DESTINATION libexec)

src/installerprompt.cpp

@@ -44,10 +44,12 @@ void InstallerPrompt::installLubuntu()
     ui->tryLubuntu->setVisible(false);
     ui->installLubuntu->setVisible(false);
     QProcess *calamares = new QProcess(this);
-    calamares->start("/usr/libexec/lubuntu-installer");
+    QStringList args;
+    calamares->start("/usr/libexec/lubuntu-installer", args);
 
     // If Calamares exits, it either crashed or the user cancelled the installation. Exit the installer prompt (and start LXQt).
-    connect(calamares, &QProcess::finished, this, &InstallerPrompt::tryLubuntu);
+    connect(calamares, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),
+        this, [this](int, QProcess::ExitStatus){ this->tryLubuntu(); });
 }
 
 InstallerPrompt::~InstallerPrompt()

src/main.cpp

@@ -1,11 +1,29 @@
 #include "installerprompt.h"
-
 #include <QApplication>
+#include <QScreen>
 
 int main(int argc, char *argv[])
 {
-    QApplication a(argc, argv);
-    InstallerPrompt w;
-    w.showFullScreen();
-    return a.exec();
+    QApplication app(argc, argv);
+    QList<InstallerPrompt*> windows;
+
+    // Iterate through all available screens
+    for (QScreen *screen : QApplication::screens()) {
+        InstallerPrompt *window = new InstallerPrompt();
+        window->setGeometry(screen->geometry());
+        window->show();
+        windows.append(window);
+    }
+
+    // Connect signals and slots to synchronize state across windows
+    for (InstallerPrompt *window : windows) {
+        for (InstallerPrompt *otherWindow : windows) {
+            if (window != otherWindow) {
+                // Connect signals and slots for synchronization
+                // Example: connect(window, &InstallerPrompt::someSignal, otherWindow, &InstallerPrompt::someSlot);
+            }
+        }
+    }
+
+    return app.exec();
 }