enum WindowBridge

"The user has grabbed the window" — starts an interactive move. Called on the press; everything after it belongs to the compositor.

Whether the window state verbs reach anything. False in a windowed app.

Whether this window can cover the screen at all.

The desktop's window corner radius, in points. 0 when windows are square, and 0 in a windowed app, where the radius belongs to whatever window manager drew the frame and is not ours to know.

Not needed to be rounded — the compositor masks a window's corners whatever the client draws. It is for matching: a menu, a dialog or a card the app draws inside its own window should carry the same radius as the window around it.

content.cornerRadius(WindowBridge.desktopCornerRadius)

Read once, when the client connected. A desktop whose config changes mid-session leaves this stale until the app restarts — see GetAppearance in the IDL for why that is a call and not a stream.

The shadow the desktop puts under a focused window: how far it reaches, how dark it is directly underneath, and how far down it is pushed.

For the same reason the radius is here — matching, not doing. The compositor casts a window's shadow; an app that gives its own menu or dialog one should use these numbers rather than pick its own, or the two will disagree in the same frame. blur 0 means the desktop casts no shadows, and so should the app.

Whether this window has no frame but its own — set by whoever opened it, because only that call knows what it asked for.

An app that runs both windowed and as a client reads this to decide whether to draw a control cluster at all: under a window manager the real frame already has one, and a second set of buttons below it is a decoration nobody asked for.

if WindowBridge.drawsOwnChrome { WindowControls() }

Whether this window currently fills the work area.

The compositor owns the fact; this is the client's copy, updated when ToggleMaximize returns and when a WindowState input event arrives (keyboard maximize, a restore from a drag). Read it in body and hide your chrome:

TitleStrip().windowChrome()

Writing it marks the tree for a body pass, so a strip that reads this disappears on the same frame the window grows.

Hides the window without ending it.

Fills the screen with this window, or gives it its old shape back.

Nil in a windowed build, where the window manager owns the decision. An app that must cover the screen to do its job — a screenshot tool showing a frozen desktop — should check rather than assume: without this it is a window like any other, and should say so rather than draw a selection over a desktop that is still moving.

Fills the work area, or restores.