[cpp] Add Qt Desginer widget plugin examples

cpp/qt/designer-plugin/CMakeLists.txt

@@ -0,0 +1,76 @@
+################################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Example of making widget plugins for Qt Designer                    ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+
+cmake_minimum_required(VERSION 3.15)
+
+project(
+    #[[NAME]]       DesignerPlugin
+    VERSION         1.0
+    DESCRIPTION     "Example of a widget plugin for Qt Designer"
+    LANGUAGES       CXX
+)
+
+include(GenerateExportHeader)
+
+add_compile_options(-Wall)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(CMAKE_SHARED_MODULE_PREFIX "")
+
+set(QT_DIR "$ENV{HOME}/Code/Clones/Qt/" CACHE PATH "Path to Qt6")
+# Qt Designer will look in different locations if WIN / Unix.
+if (WIN32)
+    set(QT_PLUGIN_INSTALL_DIR
+        "${QT_DIR}/Tools/QtCreator/bin/plugins/designer"
+    )
+else()
+    set(QT_PLUGIN_INSTALL_DIR
+        "${QT_DIR}/Tools/QtCreator/lib/Qt/plugins/designer"
+    )
+endif()
+# This should be set to your Qt6 installation directory.
+set(QT_INSTALL_DIR "${QT_DIR}/6.3.1/gcc_64/" CACHE PATH "Path to Qt6 install")
+list(APPEND CMAKE_PREFIX_PATH "${QT_INSTALL_DIR}")
+
+find_package(Qt6 REQUIRED COMPONENTS UiPlugin Core Gui Widgets)
+
+# Creating the plugin
+
+qt_add_library(widget-plugin)
+target_sources(widget-plugin PRIVATE
+    text-view.cpp text-view.h
+    widget-plugin.cpp widget-plugin.h
+)
+set_target_properties(widget-plugin PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+target_link_libraries(widget-plugin PUBLIC
+    Qt::UiPlugin Qt::Core Qt::Gui Qt::Widgets
+)
+
+install(TARGETS widget-plugin
+    RUNTIME DESTINATION "${QT_PLUGIN_INSTALL_DIR}"
+    BUNDLE DESTINATION "${QT_PLUGIN_INSTALL_DIR}"
+    LIBRARY DESTINATION "${QT_PLUGIN_INSTALL_DIR}"
+)
+
+# Application that will use the widget plugin
+
+qt_add_executable(widget-app
+    widget-app.cpp widget-app.h widget-app.ui
+    main.cpp
+)
+target_link_libraries(widget-app PRIVATE
+    Qt::Widgets widget-plugin
+)