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This requires some gymnastics to get right as the information need to be passed to the compiler despite having no direct dependency between the compiler and the runtime or backends. So use a file in the build directory to tell the default style cc: #83
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_HAS_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_HAS_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_HAS_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"ugly\n" })
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.unwrap();
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}
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