src/window_system/

src/window_system/mod.rs

#![allow(unused)]
fn main() {
#[derive(Debug, Clone)]
pub struct WindowInfo {
    pub extents: (i32, i32, i32, i32),
    pub pid: u32,
    pub app_name: String,
}
}

#![allow(unused)]
fn main() {
pub trait WindowSystem {
    fn focused_window(&self) -> &WindowInfo;
}
}

src/window_system/x11.rs

#![allow(unused)]
fn main() {
pub struct X11 {
    info: WindowInfo,
}

impl X11 {
    pub fn new() -> Result<Self, Box<dyn std::error::Error>>
}

impl WindowSystem for X11 {
    fn focused_window(&self) -> &WindowInfo
}
}

X11::new() sequence

1. RustConnection::connect(None) — open X11 display
2. Intern atoms: _NET_ACTIVE_WINDOW, _NET_WM_PID, WM_CLASS
3. get_property(_NET_ACTIVE_WINDOW, root) → active window ID
4. get_geometry(active_win) → window size
5. translate_coordinates(active_win, root, 0, 0) → absolute position
6. get_property(_NET_WM_PID) → PID
7. get_property(WM_CLASS) → first null-terminated string as app_name

#![allow(unused)]
fn main() {
pub fn screen_size() -> Result<(i32, i32), Box<dyn std::error::Error>>
}

Connects to X11, returns (width_in_pixels, height_in_pixels) of root window.