bevy/examples/app
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
..
custom_loop.rs Make Resource trait opt-in, requiring #[derive(Resource)] V2 (#5577) 2022-08-08 21:36:35 +00:00
drag_and_drop.rs Doc/module style doc blocks for examples (#4438) 2022-05-16 13:53:20 +00:00
empty.rs Doc/module style doc blocks for examples (#4438) 2022-05-16 13:53:20 +00:00
empty_defaults.rs Doc/module style doc blocks for examples (#4438) 2022-05-16 13:53:20 +00:00
headless.rs Doc/module style doc blocks for examples (#4438) 2022-05-16 13:53:20 +00:00
logs.rs Use plugin setup for resource only used at setup time (#6360) 2022-10-25 22:19:34 +00:00
no_renderer.rs Move 'startup' Resource WgpuSettings into the RenderPlugin (#6946) 2022-12-20 16:17:11 +00:00
plugin.rs Replace the bool argument of Timer with TimerMode (#6247) 2022-10-17 13:47:01 +00:00
plugin_group.rs Unique plugin (#6411) 2022-10-31 16:12:19 +00:00
return_after_run.rs Windows as Entities (#5589) 2023-01-19 00:38:28 +00:00
thread_pool_resources.rs Break CorePlugin into TaskPoolPlugin, TypeRegistrationPlugin, FrameCountPlugin. (#7083) 2023-01-05 11:42:35 +00:00
without_winit.rs Plugins own their settings. Rework PluginGroup trait. (#6336) 2022-10-24 21:20:33 +00:00