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44 lines
2.3 KiB
Rust
44 lines
2.3 KiB
Rust
/* LICENSE BEGIN
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This file is part of the SixtyFPS Project -- https://sixtyfps.io
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Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
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Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>
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SPDX-License-Identifier: GPL-3.0-only
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This file is also available under commercial licensing terms.
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Please contact info@sixtyfps.io for more information.
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LICENSE END */
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use std::path::Path;
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fn main() {
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// This is part code tries to detect automatically what default style to use and tries to
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// use the native style automatically if Qt is available.
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//
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// The way this work is this
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// 1. `qttypes`' crate's build script already detects Qt and set the DEP_QT_VERSION
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// 2. The qt rendering backend's build script will check if the qttype crates found Qt and
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// look at the SIXTYFPS_NO_QT env variable, and sets the DEP_SIXTYFPS_RENDERING_BACKEND_QT_SUPPORTS_NATIVE_STYLE
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// env variable so that the default rendering backend can know if Qt was there.
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// 3. here, in the default rendering backend, we know if we depends on the qt backend and if it
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// has set the DEP_SIXTYFPS_RENDERING_BACKEND_QT_SUPPORTS_NATIVE_STYLE env variable.
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// We then write a file in the build directory with the default style that depends on the
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// Qt availability
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// 4a. When using the sixtyfps-build crate from a build script, it will be able to read this file
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// from `sixtyfps_build::compile_with_config`
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// 4b. When using the `sixtyfps!` macro, the macro itself can read the file. But in order to know
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// the location of that file, the build script of sixtyfps-macros had to save the path in an env
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// variable
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let has_native_style = std::env::var("DEP_SIXTYFPS_RENDERING_BACKEND_QT_SUPPORTS_NATIVE_STYLE")
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.unwrap_or_default()
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== "1";
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let out_dir = std::env::var_os("OUT_DIR").unwrap();
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// out_dir is something like
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// <target_dir>/build/sixtyfps-rendering-backend-default-1fe5c4ab61eb0584/out
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// and we want to write to a common directory, so write in the build/ dir
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let target_path =
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Path::new(&out_dir).parent().unwrap().parent().unwrap().join("SIXTYFPS_DEFAULT_STYLE.txt");
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std::fs::write(target_path, if has_native_style { b"native\n" as &[u8] } else { b"fluent\n" })
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.unwrap();
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}
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