WindowManagement

IsSupported reports whether getScreenDetails exists; IsExtended reports whether more than one screen is attached, without any permission - the same reading Screen.IsExtended gives, offered here so a component already injecting this service needs no second one; QueryPermission reads the window-management state without prompting, and answers in PermissionState like every other permission read in the package.

@inject Bit.Butil.WindowManagement windowManagement

var supported = await windowManagement.IsSupported();
var extended  = await windowManagement.IsExtended();
PermissionState state = await windowManagement.QueryPermission();

Returns every attached screen and which one this window is on. Null when the API is missing or the prompt was dismissed. Before permission is granted a browser reports only the current screen, so the list length is itself a hint about the permission state.

var details = await windowManagement.GetScreenDetails();
// Null when the API is missing or the prompt was dismissed - there is nothing to enumerate.
if (details is null) return;

foreach (var screen in details.Screens)
{
    // screen.Label, screen.Left, screen.Top, screen.AvailWidth, screen.IsPrimary, screen.IsCurrent
}

Opens a window positioned on the chosen screen. It is still a popup, so it needs a user gesture and the popup blocker still applies - false means it was blocked, or that the screen index does not exist.

await windowManagement.OpenOnScreen("https://bitplatform.dev", screenIndex: 1, fullSize: true);

Takes an element fullscreen on the chosen screen rather than on the one the window is currently on. Needs a user gesture, like any fullscreen request.

<div @ref="_stage">...</div>

await windowManagement.RequestFullscreenOnScreen(_stage, screenIndex: 1);

Fires when a monitor is attached or removed, and when this window is dragged onto a different screen. The handler gets the whole snapshot, because either event can invalidate every index the caller is holding.

await using var subscription = await windowManagement.SubscribeChange(details =>
{
    // details!.Screens, details.CurrentScreenIndex
});