70 lines
1.5 KiB
Rust
70 lines
1.5 KiB
Rust
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use std::{
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fs,
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io::{ErrorKind, Error},
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path::{Path, PathBuf},
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};
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use crate::{
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color::Color,
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widgets::bar_widget::{
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BarWidget,
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BarWidgetImpl,
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},
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};
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fn read_file_as_u64(path: &Path) -> Result<u64, Error> {
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let mut s = fs::read_to_string(path)?;
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s.pop();
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s.parse::<u64>()
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.map_err(|_e| Error::new(ErrorKind::Other, "unable to parse value"))
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}
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pub struct Backlight {
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device_path: PathBuf,
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cur: u64,
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max: u64,
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dirty: bool,
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}
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impl Backlight {
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fn update(&mut self) {
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self.cur = read_file_as_u64(self.device_path.join("brightness").as_path()).unwrap();
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self.max = read_file_as_u64(self.device_path.join("max_brightness").as_path()).unwrap();
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}
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pub fn new(path: &str) -> BarWidget {
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let mut dev = Backlight{
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device_path: Path::new("/sys/class/backlight").to_path_buf().join(path),
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cur: 0,
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max: 0,
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dirty: false,
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};
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dev.update();
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BarWidget::new(Box::new(dev))
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}
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}
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impl BarWidgetImpl for Backlight {
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fn get_dirty(&self) -> bool {
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self.dirty
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}
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fn set_dirty(&mut self, dirty: bool) {
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self.dirty = dirty
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}
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fn name(&self) -> &'static str {
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"backlight"
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}
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fn value(&self) -> f32 {
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if self.cur > self.max {
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// what.
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return 1.0;
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}
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self.cur as f32 / self.max as f32
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}
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fn color(&self) -> Color {
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Color::new(1.0, 1.0, 1.0, 1.0)
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}
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}
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