Ubuntu – QML app with C++ plugin (cmake) subdirectory

application-developmentccmakeqmlubuntu-sdk

I am developing an Ubuntu Phone application "QML app with C++ plugin (cmake)" but I have so many qml files so I want to separate them by functionality

ApplicationName

CMakeListes.txt
..
app
- CmakeListes.txt
- ApplicationName.desktop.in
- tests
- mainComponents
  - sub directories of mainComponents
    - some files
  - some other files
- ApplicationName.qml
po
- CMakeListes.txt
ApplicationName.apparmor
manifest.json.in

but the "mainComponents" folder dose not appear in the project tree and after some searches I found that I must add CMakeListes.txt in every new folder and this:

add_subdirectory(folder_name)

instruction in the parent folder CMakeListes.txt file but I don't if there is more to add and I don't know how to create the CMakeListes.txt

thanks

Best Answer

You just need to learn the CMake language. It is the language of the CMakeListes.txt files that are all over the project.

This language specifies how to build the project. And this language is independent from the QtCreator IDE that we are using. So, you can do builds without QtCreator and create CMakeListes.txt manually where you wish.

Back to the problem:

You can use 'add_subdirectory' and write CMakeListes.txt for each subdirectory and append file names to QML_JS_FILES variable in each CMakeListes.txt.

But you can also do as the guys who develop core application do: for example in ubuntu-terminal-app (source code is on https://launchpad.net), they use a recursive include in app/CMakeListes.txt:

file(GLOB_RECURSE QML_JS_FILES *.qml *.js)

instead of non-recursive:

file(GLOB QML_JS_FILES *.qml *.js)

update: Yes, generally, GLOBs are not recommended, but they are already in the project templates to simulate some kind of 'automatic' behavior.

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This isn't something that QML supports, the typical answer is to write a C++ plugin to handle that kind of thing.

However, the SDK team is planning out various extensions to provide to QML app developers, and this may be something that they implement in a generic plugin that you can use.

Ubuntu – QML app with C++ plugin (cmake) adding resource file

qt5_add_resources(RESOURCES modules/ProjectName/resources.qrc)

That thing converts qrc files into C++ files. Names of C++ files are stored in the RESOURCES variable.

Executables and libraries are compiled from C++ files by using add_executable and add_library in CMakeFiles.txt. In the "QML app with C++ plugin (cmake)" project template the "C++ plugin" part means library. So somewhere in CMakeFiles.txt there is an add_library. Resource files should be added there:

add_library(Myappbackend MODULE
    ${Myappbackend_SRCS}
    ${RESOURCES}
)

Alternatively, the qrc can be compiled directly into separate library by the qt5_add_resources macro or not compiled at all (so no qt5_add_resources at all) and be load by the Qt application in runtime (see source of the core ubuntu-terminal-app for example).

Best Answer

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