[cpp] Fix root project build and dependencies.

cpp/qt/designer-plugin-collection/CMakeLists.txt

@@ -14,6 +14,9 @@ project(
     DESCRIPTION     "Example of a widget plugin collection for Qt Designer"
     LANGUAGES       CXX
 )
+message(STATUS "[Klips] Configuring example: ${PROJECT_NAME}")
+# Lowercase string to use as a slug for executable names for identification.
+string(TOLOWER ${PROJECT_NAME} PROJECT_NAME_LOWER)
 
 include(GenerateExportHeader)
 
@@ -51,43 +54,56 @@ endif()
 set(QT_INSTALL_DIR "${QT_DIR}/6.3.1/gcc_64/" CACHE PATH "Path to Qt6 install")
 list(APPEND CMAKE_PREFIX_PATH "${QT_INSTALL_DIR}")
 
-find_package(Qt6 REQUIRED COMPONENTS UiPlugin Core Gui Widgets)
+find_package(Qt6 COMPONENTS UiPlugin Core Gui Widgets)
+if (NOT Qt6_FOUND)
+    message(
+        FATAL_ERROR
+        "[Klips] Error: CMake was unable to find Qt6 libraries.\n"
+        "The example will not be built until the build is configured with these packages installed.\n"
+        "On Ubuntu 24.04 Qt6 can be installed using apt:\n"
+        "  sudo apt-get install qt6-base-dev qt6-tools-dev\n"
+    )
+endif()
 
 # Creating a library with two plugins for the collection.
-qt_add_library(widget-plugin-library
+set(WIDGET_PLUGIN_LIBRARY widget-plugin-library_${PROJECT_NAME_LOWER})
+qt_add_library(${WIDGET_PLUGIN_LIBRARY}
     textview.cpp textview.h
     widgetplugin.cpp widgetplugin.h
 )
-target_sources(widget-plugin-library PRIVATE
+target_sources(${WIDGET_PLUGIN_LIBRARY} PRIVATE
     textview.cpp textview.h
     treeview.cpp treeview.h
     widgetplugin.cpp widgetplugin.h
 )
-set_target_properties(widget-plugin-library PROPERTIES
+set_target_properties(${WIDGET_PLUGIN_LIBRARY} PROPERTIES
     WIN32_EXECUTABLE TRUE
     MACOSX_BUNDLE TRUE
 )
-target_link_libraries(widget-plugin-library
+target_link_libraries(${WIDGET_PLUGIN_LIBRARY}
     PUBLIC Qt::UiPlugin Qt::Core Qt::Gui Qt::Widgets
 )
 
-install(TARGETS widget-plugin-library
+install(TARGETS ${WIDGET_PLUGIN_LIBRARY}
     RUNTIME DESTINATION "${QT_PLUGIN_LIBRARY_DIR}"
     BUNDLE DESTINATION "${QT_PLUGIN_LIBRARY_DIR}"
     LIBRARY DESTINATION "${QT_PLUGIN_LIBRARY_DIR}"
 )
 
-generate_export_header(widget-plugin-library)
+generate_export_header(${WIDGET_PLUGIN_LIBRARY}
+    BASE_NAME widget_plugin_library
+    EXPORT_FILE_NAME "${CMAKE_CURRENT_BINARY_DIR}/widget-plugin-library_export.h"
+)
 
 # Creating the collection
-
-qt_add_library(widget-plugin-collection
+set(WIDGET_PLUGIN_COLLECTION widget-plugin-collection_${PROJECT_NAME_LOWER})
+qt_add_library(${WIDGET_PLUGIN_COLLECTION}
     widgetplugincollection.cpp widgetplugincollection.h
 )
-target_link_libraries(widget-plugin-collection
-    Qt6::Widgets Qt6::UiPlugin widget-plugin-library
+target_link_libraries(${WIDGET_PLUGIN_COLLECTION}
+    Qt6::Widgets Qt6::UiPlugin ${WIDGET_PLUGIN_LIBRARY}
 )
-install(TARGETS widget-plugin-collection
+install(TARGETS ${WIDGET_PLUGIN_COLLECTION}
     RUNTIME DESTINATION "${QT_PLUGIN_INSTALL_DIR}"
     BUNDLE DESTINATION "${QT_PLUGIN_INSTALL_DIR}"
     LIBRARY DESTINATION "${QT_PLUGIN_INSTALL_DIR}"
@@ -101,10 +117,11 @@ configure_file("${CMAKE_CURRENT_SOURCE_DIR}/app-dir.h.in"
     @ONLY
 )
 
-qt_add_executable(widget-app
+set(WIDGET_APP widget-app_${PROJECT_NAME_LOWER})
+qt_add_executable(${WIDGET_APP}
     widgetapp.cpp widgetapp.h widgetapp.ui
     main.cpp
 )
-target_link_libraries(widget-app
-    PRIVATE Qt::Widgets widget-plugin-library
+target_link_libraries(${WIDGET_APP}
+    PRIVATE Qt::Widgets ${WIDGET_PLUGIN_LIBRARY}
 )

cpp/qt/designer-plugin-collection/app-dir.h

@@ -1,6 +1,6 @@
 #ifndef APPDIR_H_IN
 #define APPDIR_H_IN
 
-#define APP_DIR "/home/kapper/Code/klips/cpp/qt/designer-plugin-collection"
+#define APP_DIR "/media/shaun/Storage/Code/klips/cpp/qt/designer-plugin-collection"
 
 #endif // APPDIR_H_IN