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A sheet blocks only this window — the rest of the app stays usable.

The panel sliding from the title bar is a sheet — modal to its window only

Sheet

/ NSWindow.beginSheet(_:completionHandler:) · NSWindow.endSheet(_:returnCode:) /

also called window-modal dialog, document-modal dialog, attached sheet

A sheet is a modal panel attached to a particular window, traditionally descending from its title bar. It prevents interaction with that parent window while other app windows can remain usable. An app-modal dialog instead blocks the application as a whole and is not visually attached to one document window.

Anatomy — every part, named

  1. 1
    Dimming layerView.sheet(isPresented:content:)

    “The darkened area behind the sheet” is the dimming layer that marks the parent surface as temporarily unavailable.

Prompt — paste into your agent

Present this as a window-modal Sheet with NSWindow.beginSheet(_:completionHandler:) (SwiftUI: View.sheet), visibly attached beneath the parent window's title bar. Block only that parent window, not every window in the app.

In code

The exact names this thing goes by in code — each row is one framework’s word for it. Use the row that matches your project (or paste it into your prompt).

AppKitNSWindow.beginSheet(_:completionHandler:)
AppKitNSWindow.endSheet(_:returnCode:)
SwiftUIView.sheet(isPresented:onDismiss:content:)
AppKitNSApplication.runModal(for:)app-modal alternative, not a sheet

See also

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