gpui-pre-linux 0.3.9

Zed's `gpui_linux` crate (gpui-pre snapshot of zed@93d7456)
Documentation 
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mod window;

use std::rc::Rc;

use gpui::{AnyWindowHandle, PlatformDisplay, PlatformWindow, WindowParams};

pub(crate) use window::HeadlessWindow;

/// The state of a `LinuxPlatform` with no display server.
///
/// It reports no displays and opens [`HeadlessWindow`]s, which lay out and handle input but draw
/// nothing.
pub(crate) struct HeadlessConnection {
    /// Cloned into every open window, so its count tells whether windows are open.
    window_lease: Rc<()>,
}

impl HeadlessConnection {
    pub(crate) fn new() -> Self {
        Self {
            window_lease: Rc::new(()),
        }
    }

    pub(crate) fn has_windows(&self) -> bool {
        Rc::strong_count(&self.window_lease) > 1
    }

    pub(crate) fn displays(&self) -> Vec<Rc<dyn PlatformDisplay>> {
        Vec::new()
    }

    pub(crate) fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>> {
        None
    }

    pub(crate) fn open_window(
        &self,
        _handle: AnyWindowHandle,
        params: WindowParams,
    ) -> anyhow::Result<Box<dyn PlatformWindow>> {
        Ok(Box::new(HeadlessWindow::new(
            params,
            self.window_lease.clone(),
        )))
    }
}