Fix issues preventing library from building with Qt 6

1. CMake instructions now handle both Qt 6 and Qt 5
2. Pass correct QString-like type to setWindowTitle
3. Remove qAsConst optimization to address deprecation warning

cmake/Qt6Portability.cmake

@@ -0,0 +1,32 @@
+
+include_directories(${QtWidgets_INCLUDE_DIRS})
+
+if(QT_USE_QTNETWORK)
+  find_package(QtNetwork REQUIRED)
+  list(APPEND QT_LIBRARIES Qt::Network)
+  include_directories(${QtNetwork_INCLUDE_DIRS})
+endif()
+
+if(QT_USE_QTXML)
+  find_package(QtXml REQUIRED)
+  list(APPEND QT_LIBRARIES Qt::Xml)
+  include_directories(${QtXml_INCLUDE_DIRS})
+endif()
+
+if(QT_USE_QTTEST)
+  find_package(QtTest REQUIRED)
+  list(APPEND QT_LIBRARIES Qt::Test)
+  include_directories(${QtTest_INCLUDE_DIRS})
+endif()
+
+macro(qt4_wrap_ui)
+  qt_wrap_ui(${ARGN})
+endmacro()
+
+macro(qt4_wrap_cpp)
+  qt_wrap_cpp(${ARGN})
+endmacro()
+
+macro(qt4_add_resources)
+  qt_add_resources(${ARGN})
+endmacro()

examples/mactouchbar/mainwindow.cpp

@@ -1,5 +1,5 @@
 /****************************************************************************
-** Copyright (C) 2019 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected].
+** Copyright (C) 2024 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected].
 ** All rights reserved.
 **
 ** This file is part of the KD MacTouchBar library.
@@ -34,7 +34,7 @@
 
 MainWindow::MainWindow()
 {
-    setWindowTitle("KDMacTouchBar Example");
+    setWindowTitle(tr("KDMacTouchBar Example"));
     resize(400, 200);
 
     // attach a touchbar to this window

src/kdmactouchbar.mm

@@ -1,5 +1,5 @@
 /****************************************************************************
-** Copyright (C) 2019 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected].
+** Copyright (C) 2024 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected].
 ** All rights reserved.
 **
 ** This file is part of the KD MacTouchBar library.
@@ -49,7 +49,7 @@
 
     auto nsImage = [[[NSImage alloc] initWithSize:NSZeroSize] autorelease];
 
-    for (const auto& size : qAsConst(sizes)) {
+    for (const auto& size : sizes) {
         const QImage qimage = icon.pixmap(size).toImage();
         CGImageRef cgImage = qimage.toCGImage();
         if (!cgImage)