如何使用cmake（和visual studio）为qt设计器创建自定义（小部件）插件

Question

教程的数量，如何创建一个qt设计器插件是非常薄的...我发现总是使用qt创建者（像这样： http ： //qt-project.org/doc/qt-4.8/designer-customwidgetplugin .html ）。 我必须在.pro文件中添加一些qt定义

 CONFIG      += designer plugin

我使用CMake和Visual Studio进行编码，所以如果有人能告诉我如何成功创建一个.dll，我可以放入插件/设计器文件夹以使自定义小部件显示在Qt Designer中，这真的很棒

Answer 1

免责声明：我知道这是一个老问题，但即使是现在我也没有找到完整的资源来解决这个问题。

因为我构建在（windows）命令行上，所以我无法回答你的Visual Studio部分，但这是我的cmake。

我假设您已经创建了与插件相关的以下文件，即：

• widget.h
• widget.cpp
• widget.ui
• widgetPlugin.h - > QDesignerCustomWidgetInterface类
• widgetPlugin.cpp

并且您想要创建一个包含多个插件的库，即创建相关文件：

• plugins.h - > QDesignerCustomWidgetCollectionInterface类
• plugins.cpp

文件的内容只是遵循教程中的内容。

CMakeLists.txt是：

cmake_minimum_required(VERSION 2.8)

set(PROJECT Plugins)
project(${PROJECT})

# Needed to compile against ui and moc generated files
include_directories(${CMAKE_CURRENT_BINARY_DIR})

set(SOURCES
    plugins.cpp
    widgetPlugin.cpp
    widget.cpp
)

set(HEADERS
    plugins.h
    widgetPlugin.h
    widget.h
)

set(FORMS
    widget.ui
)

# This is experimental, it works but it may be not optimal, don't hesitate to change this
find_package(Qt4 REQUIRED QtCore QtGui QtDesigner)
if (QT4_FOUND AND QT_QTCORE_FOUND AND QT_QTGUI_FOUND AND QT_QTDESIGNER_FOUND)
    set(QT_USE_QTDESIGNER TRUE)
    include(${QT_USE_FILE})
else()
    message(FATAL_ERROR "no qt...")
endif()

qt4_wrap_cpp(HEADERS_MOC ${HEADERS})
qt4_wrap_ui(FORMS_HEADERS ${FORMS})
qt4_add_resources(RESOURCES_RCC ${RESOURCES})

# Here too, I'm not sure every define is necessary
include_directories(${CMAKE_CURRENT_BINARY_DIR})
add_definitions(-DQT_PLUGIN)
add_definitions(-DQT_NO_DEBUG)
add_definitions(-DQT_SHARED)
add_definitions(-DQDESIGNER_EXPORT_WIDGETS)

add_library(${PROJECT} SHARED
    ${SOURCES}
    ${HEADERS_MOC}
    ${FORMS_HEADERS}
    ${RESOURCES_RCC}
)
target_link_libraries(${PROJECT} ${QT_LIBRARIES})

# Install the library in QtDesigner plugin directory
install(TARGETS ${PROJECT}
    DESTINATION ${QT_PLUGINS_DIR}/designer
)

要在QtDesigner中重新加载插件，请转到“帮助”>“关于插件”>“重新加载”。

然后在其他CMakeLists.txt中，我不想包含该库，因为还有无用的* Plugin文件。 所以我再次包含了我想要的文件：

cmake_minimum_required(VERSION 2.8)

set(PROJECT GPAUSX)
project(${PROJECT})

# Include the other CMakeLists.txt
subdirs(Plugins)
find_package(Qt4 REQUIRED)

# Files to insert
set(SOURCES
    main.cpp
    MainWindow.cpp
    ${Plugins_SOURCE_DIR}/widget.cpp

)
set(HEADERS
    MainWindow.h
    ${Plugins_SOURCE_DIR}/widget.h

)
set(FORMS
    MainWindow.ui
    ${Plugins_SOURCE_DIR}/widget.ui
)

qt4_wrap_cpp(HEADERS_MOC ${HEADERS})
qt4_wrap_ui(FORMS_HEADERS ${FORMS})
qt4_add_resources(RESOURCES_RCC ${RESOURCES})

include(${QT_USE_FILE})
include_directories(${CMAKE_CURRENT_BINARY_DIR})
add_definitions(${QT_DEFINITIONS})
# I'm no expert in libraries so, intuitively I'd say this is useless but it won't compile if I don't define it.
# This clearly needs to get fixed.
add_definitions(-DQDESIGNER_EXPORT_WIDGETS)

# Possible variants making it compile :
# 1/ either include Plugins_BINARY_DIR or include .uis
#   including the binary dir makes use of the already generated .uis
# 2/ either target Plugins or add Plugins .uis, .hs and .cpps with -DQDESIGNER_EXPORT_WIDGETS
#   if you target plugins, make sure you compile with the same flags

add_executable(${PROJECT}
    ${SOURCES}
    ${HEADERS_MOC}
    ${FORMS_HEADERS}
    ${RESOURCES_RCC}
)
target_link_libraries(${PROJECT}
    # Uncomment the following if you want to target Plugins
    #Plugins
    ${QT_LIBRARIES}
)

希望你会发现它很有用！

Answer 2

只需使用cmake的qt auto工具并将所有源（.cpp .ui .qrc等）添加到目标，如下所示：

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)

find_package(Qt4 REQUIRED QtCore QtGui QtDesigner #...
)
include(${QT_USE_FILE})
add_definitions(${QT_DEFINITIONS})

add_library(someplugin SHARED
    path/to/plugin/someplugin.cpp
    path/to/plugin/someplugin.qrc
    path/to/plugin/someplugin.ui
    path/to/plugin/s/other/src.cpp
    #...
)

target_link_libraries(someplugin ${QT_LIBRARIES})

install(TARGETS someplugin
    DESTINATION ${QT_PLUGINS_DIR}/designer
)