[libcalamaresui] Don't build QML bits if they're not wanted

When WITH_QML is off (by explicit choice)

- don't build the QmlViewStep
- don't build the QML slideshow

src/libcalamaresui/CMakeLists.txt

@@ -14,11 +14,9 @@ set( calamaresui_SOURCES
     utils/CalamaresUtilsGui.cpp
     utils/ImageRegistry.cpp
     utils/Paste.cpp
-    utils/Qml.cpp
 
     viewpages/BlankViewStep.cpp
     viewpages/ExecutionViewStep.cpp
-    viewpages/QmlViewStep.cpp
     viewpages/Slideshow.cpp
     viewpages/ViewStep.cpp
 
@@ -45,10 +43,6 @@ if( WITH_PYTHON )
 endif()
 
 if( WITH_PYTHONQT )
-    include_directories(${PYTHON_INCLUDE_DIRS})
-    # *_DIRS because we also use extensions
-    include_directories(${PYTHONQT_INCLUDE_DIRS})
-
     list( APPEND calamaresui_SOURCES
         modulesystem/PythonQtViewModule.cpp
         utils/PythonQtUtils.cpp
@@ -57,25 +51,33 @@ if( WITH_PYTHONQT )
         viewpages/PythonQtGlobalStorageWrapper.cpp
         viewpages/PythonQtUtilsWrapper.cpp
     )
-    set( OPTIONAL_PYTHON_LIBRARIES
-        ${PYTHON_LIBRARIES}
-        ${PYTHONQT_LIBRARIES}
+endif()
+
+if( WITH_QML )
+    list( APPEND calamaresui_SOURCES
+        utils/Qml.cpp
+        viewpages/QmlViewStep.cpp
     )
 endif()
 
 calamares_add_library( calamaresui
     SOURCES ${calamaresui_SOURCES}
     EXPORT_MACRO UIDLLEXPORT_PRO
-    LINK_PRIVATE_LIBRARIES
-        ${OPTIONAL_PYTHON_LIBRARIES}
     LINK_LIBRARIES
         Qt5::Svg
-        Qt5::QuickWidgets
     RESOURCES libcalamaresui.qrc
     EXPORT CalamaresLibraryDepends
     VERSION ${CALAMARES_VERSION_SHORT}
 )
 
-if ( KF5CoreAddons_FOUND AND KF5CoreAddons_VERSION VERSION_GREATER_EQUAL 5.58 )
+if( KF5CoreAddons_FOUND AND KF5CoreAddons_VERSION VERSION_GREATER_EQUAL 5.58 )
     target_compile_definitions( calamaresui PRIVATE WITH_KOSRelease )
 endif()
+if( WITH_PYTHONQT )
+    # *_DIRS because we also use extensions
+    target_include_directories( calamaresui PRIVATE ${PYTHON_INCLUDE_DIRS} ${PYTHONQT_INCLUDE_DIRS} )
+    target_link_libraries( calamaresui PRIVATE ${PYTHON_LIBRARIES} ${PYTHONQT_LIBRARIES} )
+endif()
+if( WITH_QML )
+    target_link_libraries( calamaresui PUBLIC Qt5::QuickWidgets )
+endif()

src/libcalamaresui/viewpages/ExecutionViewStep.cpp

@@ -23,11 +23,11 @@
 #include "Slideshow.h"
 
 #include "Branding.h"
+#include "CalamaresConfig.h"
 #include "Job.h"
 #include "JobQueue.h"
 #include "Settings.h"
 #include "ViewManager.h"
-
 #include "modulesystem/Module.h"
 #include "modulesystem/ModuleManager.h"
 #include "utils/CalamaresUtilsGui.h"
@@ -49,10 +49,12 @@ makeSlideshow( QWidget* parent )
     {
     case -1:
         return new Calamares::SlideshowPictures( parent );
+#ifdef WITH_QML
     case 1:
         FALLTHRU;
     case 2:
         return new Calamares::SlideshowQML( parent );
+#endif
     default:
         cWarning() << "Unknown Branding slideshow API" << api;
         return new Calamares::SlideshowPictures( parent );

src/libcalamaresui/viewpages/Slideshow.cpp

@@ -28,10 +28,12 @@
 
 #include <QLabel>
 #include <QMutexLocker>
+#ifdef WITH_QML
 #include <QQmlComponent>
 #include <QQmlEngine>
 #include <QQuickItem>
 #include <QQuickWidget>
+#endif
 #include <QTimer>
 
 #include <chrono>
@@ -41,6 +43,7 @@ namespace Calamares
 
 Slideshow::~Slideshow() {}
 
+#ifdef WITH_QML
 SlideshowQML::SlideshowQML( QWidget* parent )
     : Slideshow( parent )
     , m_qmlShow( new QQuickWidget )
@@ -173,6 +176,7 @@ SlideshowQML::changeSlideShowState( Action state )
 
     m_state = state;
 }
+#endif
 
 SlideshowPictures::SlideshowPictures( QWidget* parent )
     : Slideshow( parent )

src/libcalamaresui/viewpages/Slideshow.h

@@ -21,15 +21,19 @@
 #ifndef LIBCALAMARESUI_SLIDESHOW_H
 #define LIBCALAMARESUI_SLIDESHOW_H
 
+#include "CalamaresConfig.h"
+
 #include <QMutex>
 #include <QStringList>
 #include <QWidget>
 
 class QLabel;
 class QTimer;
+#ifdef WITH_QML
 class QQmlComponent;
 class QQuickItem;
 class QQuickWidget;
+#endif
 
 namespace Calamares
 {
@@ -81,6 +85,7 @@ protected:
     Action m_state = Stop;
 };
 
+#ifdef WITH_QML
 /** @brief Slideshow using a QML file
  *
  * This is the "classic" slideshow in Calamares, which runs some QML
@@ -109,6 +114,7 @@ private:
     QQmlComponent* m_qmlComponent;
     QQuickItem* m_qmlObject;  ///< The actual show
 };
+#endif
 
 /** @brief Slideshow using images
  *