Disclosure Triangle
A Disclosure Triangle is a small arrow that opens or closes one branch of a tree in the same place.
Another example
A file outline opens one folder's children. All other branches keep their current open or closed state.
Main parts
- 01Window chrome
- 02Primary content region
- 03Platform control and state
Use it when
Use it when each row can open its own child items and keeping branches open helps people compare them.
Do not use it when
Do not use it for navigation or a one-time command. The content must have a real parent–child tree.
Name used in code
NSOutlineView disclosure cell / SwiftUI DisclosureGroup Before you ship
Check the supported macOS versions and AppKit or SwiftUI integration. Check standard focus and keyboard behavior. Also check VoiceOver, Full Keyboard Access, window resizing, and multi-window state. When needed, check restore, localization, and reduced motion.
Outcome: Apply or review Disclosure Triangle in a native macOS app without breaking platform rules. User context: A file outline opens one folder's children. All other branches keep their current open or closed state. macOS concept or control: Disclosure Triangle. Why it fits: Use it when each row can open its own child items and keeping branches open helps people compare them. Do not use it when: Do not use it for navigation or a one-time command. The content must have a real parent–child tree. Platform requirements: List the supported macOS versions. Say whether AppKit or SwiftUI owns each part and how they connect. Define window, menu, focus, keyboard, saved state, restore, and multi-window behavior. Platform accessibility and resilience: Use the right accessibility APIs. Check VoiceOver and Full Keyboard Access. Support localization, contrast, and reduced motion when needed. Keep user state after a relaunch. Acceptance criteria: Check the behavior on supported macOS versions with a keyboard and VoiceOver. Window resizing, focus, state restore, and AppKit or SwiftUI integration work in the normal macOS way. Evidence and limits (evidence boundary): It is official for that source. Other platforms or teams may use the term in another way. Unknowns to confirm: Supported macOS versions, AppKit or SwiftUI structure, and window model. Also confirm sandbox and entitlement limits, save rules, and the accessibility goal.
Check this request
Review the current use of Disclosure Triangle. Definition: A Disclosure Triangle is a small arrow that opens or closes one branch of a tree in the same place. Release checks: Check the supported macOS versions and AppKit or SwiftUI integration. Check standard focus and keyboard behavior. Also check VoiceOver, Full Keyboard Access, window resizing, and multi-window state. When needed, check restore, localization, and reduced motion. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.