015f2c69ca
# Objective Continue improving the user experience of our UI Node API in the direction specified by [Bevy's Next Generation Scene / UI System](https://github.com/bevyengine/bevy/discussions/14437) ## Solution As specified in the document above, merge `Style` fields into `Node`, and move "computed Node fields" into `ComputedNode` (I chose this name over something like `ComputedNodeLayout` because it currently contains more than just layout info. If we want to break this up / rename these concepts, lets do that in a separate PR). `Style` has been removed. This accomplishes a number of goals: ## Ergonomics wins Specifying both `Node` and `Style` is now no longer required for non-default styles Before: ```rust commands.spawn(( Node::default(), Style { width: Val::Px(100.), ..default() }, )); ``` After: ```rust commands.spawn(Node { width: Val::Px(100.), ..default() }); ``` ## Conceptual clarity `Style` was never a comprehensive "style sheet". It only defined "core" style properties that all `Nodes` shared. Any "styled property" that couldn't fit that mold had to be in a separate component. A "real" style system would style properties _across_ components (`Node`, `Button`, etc). We have plans to build a true style system (see the doc linked above). By moving the `Style` fields to `Node`, we fully embrace `Node` as the driving concept and remove the "style system" confusion. ## Next Steps * Consider identifying and splitting out "style properties that aren't core to Node". This should not happen for Bevy 0.15. --- ## Migration Guide Move any fields set on `Style` into `Node` and replace all `Style` component usage with `Node`. Before: ```rust commands.spawn(( Node::default(), Style { width: Val::Px(100.), ..default() }, )); ``` After: ```rust commands.spawn(Node { width: Val::Px(100.), ..default() }); ``` For any usage of the "computed node properties" that used to live on `Node`, use `ComputedNode` instead: Before: ```rust fn system(nodes: Query<&Node>) { for node in &nodes { let computed_size = node.size(); } } ``` After: ```rust fn system(computed_nodes: Query<&ComputedNode>) { for computed_node in &computed_nodes { let computed_size = computed_node.size(); } } ```
94 lines
2.4 KiB
Rust
94 lines
2.4 KiB
Rust
//! An example showing how to save screenshots to disk
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use bevy::{
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prelude::*,
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render::view::screenshot::{save_to_disk, Capturing, Screenshot},
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window::SystemCursorIcon,
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winit::cursor::CursorIcon,
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};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, (screenshot_on_spacebar, screenshot_saving))
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.run();
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}
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fn screenshot_on_spacebar(
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mut commands: Commands,
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input: Res<ButtonInput<KeyCode>>,
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mut counter: Local<u32>,
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) {
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if input.just_pressed(KeyCode::Space) {
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let path = format!("./screenshot-{}.png", *counter);
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*counter += 1;
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commands
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.spawn(Screenshot::primary_window())
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.observe(save_to_disk(path));
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}
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}
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fn screenshot_saving(
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mut commands: Commands,
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screenshot_saving: Query<Entity, With<Capturing>>,
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windows: Query<Entity, With<Window>>,
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) {
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let Ok(window) = windows.get_single() else {
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return;
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};
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match screenshot_saving.iter().count() {
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0 => {
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commands.entity(window).remove::<CursorIcon>();
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}
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x if x > 0 => {
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commands
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.entity(window)
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.insert(CursorIcon::from(SystemCursorIcon::Progress));
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}
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_ => {}
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}
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}
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/// set up a simple 3D scene
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fn setup(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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// plane
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commands.spawn((
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Mesh3d(meshes.add(Plane3d::default().mesh().size(5.0, 5.0))),
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MeshMaterial3d(materials.add(Color::srgb(0.3, 0.5, 0.3))),
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));
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// cube
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commands.spawn((
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Mesh3d(meshes.add(Cuboid::default())),
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MeshMaterial3d(materials.add(Color::srgb(0.8, 0.7, 0.6))),
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Transform::from_xyz(0.0, 0.5, 0.0),
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));
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// light
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commands.spawn((
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PointLight {
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shadows_enabled: true,
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..default()
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},
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Transform::from_xyz(4.0, 8.0, 4.0),
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));
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// camera
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commands.spawn((
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Camera3d::default(),
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Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
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));
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commands.spawn((
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Text::new("Press <spacebar> to save a screenshot to disk"),
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Node {
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position_type: PositionType::Absolute,
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top: Val::Px(12.0),
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left: Val::Px(12.0),
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..default()
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},
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));
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}
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