Enum WindowOpenReply 

pub enum WindowOpenReply<H> {
    Open(H),
    Pending,
    Unsupported,
}

A backend’s answer to Toolkit::open_window (docs/windows.md).

Variants

Open(H)

The window exists now; here is its content container (desktop backends).

Pending

Native creation started but completes asynchronously (a scene, an activity, an ability); the backend will call day_core::finish_window_open when the content container exists. day-core parks the window record until then.

Unsupported

This toolkit cannot open windows (Cap::MultiWindow = Unsupported); day-core falls back to presenting the content as a fullscreen cover in the primary window.