你如何使用 gtk4-rs 设置 X11 window 提示？

Question

我正在尝试用 Rust 编写一个 GTK4 应用程序，它应该符合 Extended Window Manager Hints spec, but for that I need to be able to get and set X11 hints. In particular, I want to set _NET_WM_WINDOW_TYPE.

的部分内容

如果我要创建一个 window 如下，我将如何 get/set X11 window 提示？

let app = Application::new(Some("id"), Default::default());
let window = ApplicationWindow::new(app);

Answer 1

经过几天的反复试验，我得出了以下解决方案：

use gdk_x11::x11::xlib::{PropModeReplace, XChangeProperty, XInternAtom, XA_ATOM};

fn set_window_props(window: &gtk::Window, prop_name: &str, prop_values: &Vec<&str>) {
    let display = window.display();
    let surface = window.surface().unwrap();
    let prop_name_cstr = CString::new(prop_name).unwrap();
    let prop_values_cstr: Vec<CString> = prop_values
        .iter()
        .map(|val| CString::new(*val).unwrap())
        .collect();
    unsafe {
        let xid: xlib::Window = surface.unsafe_cast::<X11Surface>().xid();
        let xdisplay: *mut xlib::Display = display.unsafe_cast::<X11Display>().xdisplay();
        let prop_name_atom = XInternAtom(xdisplay, prop_name_cstr.as_ptr(), xlib::False);
        let mut prop_values_atom: Vec<u64> = prop_values_cstr
            .into_iter()
            .map(|cstr| XInternAtom(xdisplay, cstr.as_ptr(), xlib::False))
            .collect();
        let num_values = prop_values_atom.len();
        let prop_values_c = prop_values_atom.as_mut_ptr();
        XChangeProperty(
            xdisplay,
            xid,
            prop_name_atom,
            XA_ATOM,
            32,
            PropModeReplace,
            prop_values_c as *const u8,
            num_values as i32,
        );
    }
}

这将设置用原子替换 X11 Window 属性 prop_name 类型 XA_ATOM 的值 值 prop_values.

设置utf8类型的属性，使用gdk4_x11::X11Surface::set_utf8_property更简洁明了。