b15894b70a
Summary: Cleans up some of the changes to UseWebDefaults that were made in the interest of moving it outside of YGConfig. It still exists in YGConfig, but also exists on the node. We also assert on null config, or when someone tries to change UseWebDefaults after creating a node (since right now YGStyle does not know the difference between unset vs set explicitly to what would normally be default). Removes a peculiar constructor which was added to avoid config setting. Reviewed By: rshest Differential Revision: D45133644 fbshipit-source-id: 2b5e2baeb826653133df9b1175cf5c194e342e3e
Yoga 
Yoga is an embeddable and performant flexbox layout engine with bindings for multiple languages.
Building
Yoga's main implementation targets C++ 14 with accompanying build logic in CMake. A wrapper is provided to build the main library and run unit tests.
./unit_tests <Debug|Release>
While not required, this script will use ninja if it is installed for faster builds.
Yoga is additionally part of the vcpkg collection of ports maintained by Microsoft and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.
Adding Tests
Many of Yoga's tests are automatically generated, using HTML fixtures describing node structure. These are rendered in Chrome to generate an expected layout result for the tree. New fixtures can be added to gentest/fixtures.
<div id="my_test" style="width: 100px; height: 100px; align-items: center;">
<div style="width: 50px; height: 50px;"></div>
</div>
To generate new tests from added fixtures:
- Run
bundle installin thegentestdirectory to install dependencies of the test generator. - Run
ruby gentest.rbin thegentestdirectory.
Debugging
Yoga provides a VSCode "launch.json" configuration which allows debugging unit tests. Simply add your breakpoints, and run "Debug C++ Unit tests (lldb)" (or "Debug C++ Unit tests (vsdbg)" on Windows).