bevy/examples/ui
Aceeri ddfafab971 Windows as Entities (#5589)
# Objective

Fix https://github.com/bevyengine/bevy/issues/4530

- Make it easier to open/close/modify windows by setting them up as `Entity`s with a `Window` component.
- Make multiple windows very simple to set up. (just add a `Window` component to an entity and it should open)

## Solution

- Move all properties of window descriptor to ~components~ a component.
- Replace `WindowId` with `Entity`.
- ~Use change detection for components to update backend rather than events/commands. (The `CursorMoved`/`WindowResized`/... events are kept for user convenience.~
  Check each field individually to see what we need to update, events are still kept for user convenience.

---

## Changelog

- `WindowDescriptor` renamed to `Window`.
    - Width/height consolidated into a `WindowResolution` component.
    - Requesting maximization/minimization is done on the [`Window::state`] field.
- `WindowId` is now `Entity`.

## Migration Guide

- Replace `WindowDescriptor` with `Window`.
    - Change `width` and `height` fields in a `WindowResolution`, either by doing
      ```rust
      WindowResolution::new(width, height) // Explicitly
      // or using From<_> for tuples for convenience
      (1920., 1080.).into()
      ```
- Replace any `WindowCommand` code to just modify the `Window`'s fields directly  and creating/closing windows is now by spawning/despawning an entity with a `Window` component like so:
  ```rust
  let window = commands.spawn(Window { ... }).id(); // open window
  commands.entity(window).despawn(); // close window
  ```

## Unresolved
- ~How do we tell when a window is minimized by a user?~
  ~Currently using the `Resize(0, 0)` as an indicator of minimization.~
  No longer attempting to tell given how finnicky this was across platforms, now the user can only request that a window be maximized/minimized.
  
 ## Future work
 - Move `exit_on_close` functionality out from windowing and into app(?)
 - https://github.com/bevyengine/bevy/issues/5621
 - https://github.com/bevyengine/bevy/issues/7099
 - https://github.com/bevyengine/bevy/issues/7098


Co-authored-by: Carter Anderson <mcanders1@gmail.com>
2023-01-19 00:38:28 +00:00
..
button.rs Remove auto-margin properties from the examples (#6535) 2022-11-21 14:38:35 +00:00
font_atlas_debug.rs Rename Handle::as_weak() to cast_weak() (#5321) 2022-10-28 22:43:14 +00:00
relative_cursor_position.rs Relative cursor position (#7199) 2023-01-16 17:17:45 +00:00
text.rs Remove VerticalAlign from TextAlignment (#6807) 2023-01-18 02:19:17 +00:00
text_debug.rs Windows as Entities (#5589) 2023-01-19 00:38:28 +00:00
transparency_ui.rs Remove auto-margin properties from the examples (#6535) 2022-11-21 14:38:35 +00:00
ui.rs Fixes scroll example after inverting UI Y axis (#6290) 2022-10-18 13:28:35 +00:00
ui_scaling.rs UI scaling fix (#6479) 2022-11-05 13:51:12 +00:00
window_fallthrough.rs Windows as Entities (#5589) 2023-01-19 00:38:28 +00:00
z_index.rs Remove auto-margin properties from the examples (#6535) 2022-11-21 14:38:35 +00:00