b72a46db68
Some checks failed
Update All Top Ranking Issues / update_top_ranking_issues (push) Has been cancelled
Triage Project Sync (#84) / Sync triage project (push) Has been cancelled
release_nightly / notify_on_failure (push) Has been cancelled
release_nightly / check_style (push) Has been cancelled
release_nightly / run_tests_windows (push) Has been cancelled
release_nightly / clippy_windows (push) Has been cancelled
release_nightly / bundle_linux_aarch64 (push) Has been cancelled
release_nightly / bundle_linux_x86_64 (push) Has been cancelled
release_nightly / bundle_mac_aarch64 (push) Has been cancelled
release_nightly / bundle_mac_x86_64 (push) Has been cancelled
release_nightly / bundle_windows_aarch64 (push) Has been cancelled
release_nightly / bundle_windows_x86_64 (push) Has been cancelled
release_nightly / build_nix_linux_x86_64 (push) Has been cancelled
release_nightly / build_nix_mac_aarch64 (push) Has been cancelled
release_nightly / update_nightly_tag (push) Has been cancelled
Hotfix Review Monitor / check-hotfix-reviews (push) Has been cancelled
Stale PR Review Reminder / check-stale-prs (push) Has been cancelled
Update Weekly Top Ranking Issues / update_top_ranking_issues (push) Has been cancelled
Bump collab-staging Tag / update-collab-staging-tag (push) Has been cancelled
compliance_check / scheduled_compliance_check (push) Has been cancelled
Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree with a 3-file patch applied (no upstream history). Patch (crates/gpui_linux/src/linux/wayland/): - serial.rs: add SerialKind::KeyboardEnter - client.rs: store wl_keyboard.enter serial; add latest_serial_of() - window.rs: activate() uses keyboard-enter serial (Mutter focus gate) Mutter honors window activation only when the token carries the keyboard- focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial. See docs/tray-window-focus-wayland.md in logiguard. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
34 lines
2.2 KiB
Markdown
34 lines
2.2 KiB
Markdown
# Contexts
|
|
|
|
GPUI makes extensive use of _context parameters_ (typically named `cx`) to provide access to application state and services. These contexts are references passed to functions, enabling interaction with global state, windows, entities, and system services.
|
|
|
|
---
|
|
|
|
## `App`
|
|
|
|
The root context granting access to the application's global state. This context owns all entities' data and can be used to read or update the data referenced by an `Entity<T>`.
|
|
|
|
## `Context<T>`
|
|
|
|
A context provided when interacting with an `Entity<T>`, with additional methods related to that specific entity such as notifying observers and emitting events. This context dereferences into `App`, meaning any function which can take an `App` reference can also take a `Context<T>` reference, allowing you to access the application's global state.
|
|
|
|
## `AsyncApp` and `AsyncWindowContext`
|
|
|
|
Whereas the above contexts are always passed to your code as references, you can call `to_async` on the reference to create an async context, which has a static lifetime and can be held across `await` points in async code. When you interact with entities with an async context, the calls become fallible, because the context may outlive the window or even the app itself.
|
|
|
|
## `TestAppContext`
|
|
|
|
These are similar to the async contexts above, but they panic if you attempt to access a non-existent app or window, and they also contain other features specific to tests.
|
|
|
|
---
|
|
|
|
# Non-Context Core Types
|
|
|
|
## `Window`
|
|
|
|
Provides access to the state of an application window. This type has a root view (an `Entity` implementing `Render`) which it can read/update, but since it is not a context, you must pass a `&mut App` (or a context which dereferences to it) to do so, along with other functions interacting with global state. You can obtain a `Window` from an `WindowHandle` by calling `WindowHandle::update`.
|
|
|
|
## `Entity<T>`
|
|
|
|
A handle to a structure requiring state. This data is owned by the `App` and can be accessed and modified via references to contexts. If `T` implements `Render`, then the entity is sometimes referred to as a view. Entities can be observed by other entities and windows, allowing a closure to be called when `notify` is called on the entity's `Context`.
|