From a4f496d259796c277cf5abcd0d53c7fa10972d01 Mon Sep 17 00:00:00 2001
From: Bas Schouten <bas@basschouten.com>
Date: Tue, 31 Jan 2023 20:21:52 +0100
Subject: [PATCH] Downgrade to Qt5 for Pi0 compatibility.

---
 CMakeLists.txt  | 62 +++++++++++++++++++++++++++++++++++--------------
 main.cpp        |  8 ++++++-
 main.qml        | 23 +++---------------
 mqttinterface.h |  2 +-
 qml.qrc         |  5 ++++
 5 files changed, 60 insertions(+), 40 deletions(-)
 create mode 100644 qml.qrc

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff02d94..6f09178 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,30 +1,54 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.14)
 
-project(qthomecontrol VERSION 0.1 LANGUAGES CXX)
+project(test VERSION 0.1 LANGUAGES CXX)
 
+set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTOMOC ON)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_AUTORCC ON)
 
-find_package(Qt6 6.2 COMPONENTS Quick REQUIRED)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 if (UNIX)
     add_subdirectory ("paho.mqtt.c")
 endif(UNIX)
 
-qt_add_executable(appqthomecontrol
-    main.cpp
-    mqttinterface.cpp
-    mqttinterface.h
-)
+find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core Quick)
+find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Core Quick)
 
-qt_add_qml_module(appqthomecontrol
-    URI qthomecontrol
-    VERSION 1.0
-    QML_FILES main.qml 
-    SOURCES
-      mqttinterface.h mqttinterface.cpp
+set(PROJECT_SOURCES
+        main.cpp
+        qml.qrc
+        mqttinterface.cpp
+        mqttinterface.h
 )
 
+if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
+    qt_add_executable(appqthomecontrol
+        MANUAL_FINALIZATION
+        ${PROJECT_SOURCES}
+    )
+# Define target properties for Android with Qt 6 as:
+#    set_property(TARGET test APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
+#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
+# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
+else()
+    if(ANDROID)
+        add_library(appqthomecontrol SHARED
+            ${PROJECT_SOURCES}
+        )
+# Define properties for Android with Qt 5 after find_package() calls as:
+#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
+    else()
+        add_executable(appqthomecontrol
+          ${PROJECT_SOURCES}
+        )
+    endif()
+endif()
+
+target_link_libraries(appqthomecontrol
+  PRIVATE Qt${QT_VERSION_MAJOR}::Core Qt${QT_VERSION_MAJOR}::Quick)
+
 set_target_properties(appqthomecontrol PROPERTIES
     MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
     MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
@@ -35,9 +59,6 @@ set_target_properties(appqthomecontrol PROPERTIES
 
 target_include_directories (appqthomecontrol PRIVATE paho.mqtt.c/src)
 
-target_link_libraries(appqthomecontrol
-    PRIVATE Qt6::Quick)
-
 if (WIN32)
     target_link_libraries (appqthomecontrol PRIVATE ${CMAKE_SOURCE_DIR}/paho.mqtt.c/src/Release/paho-mqtt3a.lib ${CMAKE_SOURCE_DIR}/paho.mqtt.c/src/Release/paho-mqtt3c.lib)
 endif (WIN32)
@@ -48,3 +69,8 @@ endif(UNIX)
 install(TARGETS appqthomecontrol
     BUNDLE DESTINATION .
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+if(QT_VERSION_MAJOR EQUAL 6)
+    qt_import_qml_plugins(qthomecontrol)
+    qt_finalize_executable(qthomecontrol)
+endif()
diff --git a/main.cpp b/main.cpp
index e4ddce2..2124962 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,13 +1,19 @@
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
 
+#include "mqttinterface.h"
 
 int main(int argc, char *argv[])
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#endif
     QGuiApplication app(argc, argv);
 
+    qmlRegisterType<MQTTInterface>("QtHomeControl", 1, 0, "MQTTInterface");
+
     QQmlApplicationEngine engine;
-    const QUrl url(u"qrc:/qthomecontrol/main.qml"_qs);
+    const QUrl url(QStringLiteral("qrc:/main.qml"));
     QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                      &app, [url](QObject *obj, const QUrl &objUrl) {
         if (!obj && url == objUrl)
diff --git a/main.qml b/main.qml
index b5b938d..b761750 100644
--- a/main.qml
+++ b/main.qml
@@ -1,7 +1,6 @@
-import QtQuick
-import QtQuick.Controls 6.3
-import QtQuick.Layouts 6.3
-import qthomecontrol
+import QtQuick 2.15
+import QtQuick.Window 2.15
+import QtHomeControl 1.0
 
 Window {
     width: 720
@@ -14,22 +13,6 @@ Window {
         id: mqttinterface
     }
 
-    Slider {
-        id: slider
-        x: 13
-        y: 534
-        width: 695
-        height: 178
-        live: true
-        antialiasing: false
-        topPadding: 0
-        orientation: Qt.Horizontal
-        snapMode: RangeSlider.SnapOnRelease
-        stepSize: 1
-        to: 100
-        value: 0
-    }
-
     Text {
         id: text1
         x: 206
diff --git a/mqttinterface.h b/mqttinterface.h
index 1b54a9a..e2e4340 100644
--- a/mqttinterface.h
+++ b/mqttinterface.h
@@ -2,7 +2,7 @@
 #define MQTTINTERFACE_H
 
 #include <QObject>
-#include <QtQml/qqmlregistration.h>
+#include <qqml.h>
 #include <mutex>
 
 #include "MQTTClient.h"
diff --git a/qml.qrc b/qml.qrc
new file mode 100644
index 0000000..5f6483a
--- /dev/null
+++ b/qml.qrc
@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>
-- 
2.47.3