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https://github.com/bevyengine/bevy
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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(); } } ```
220 lines
6.5 KiB
Rust
220 lines
6.5 KiB
Rust
//! This example shows how to create a node with a shadow
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use argh::FromArgs;
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use bevy::color::palettes::css::DEEP_SKY_BLUE;
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use bevy::color::palettes::css::LIGHT_SKY_BLUE;
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use bevy::prelude::*;
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use bevy::winit::WinitSettings;
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#[derive(FromArgs, Resource)]
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/// `box_shadow` example
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struct Args {
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/// number of samples
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#[argh(option, default = "4")]
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samples: u32,
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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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// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
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.insert_resource(WinitSettings::desktop_app())
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.add_systems(Startup, setup)
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.run();
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}
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fn setup(mut commands: Commands) {
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// `from_env` panics on the web
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#[cfg(not(target_arch = "wasm32"))]
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let args: Args = argh::from_env();
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#[cfg(target_arch = "wasm32")]
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let args = Args::from_args(&[], &[]).unwrap();
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// ui camera
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commands.spawn((Camera2d, UiBoxShadowSamples(args.samples)));
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commands
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.spawn((
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Node {
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width: Val::Percent(100.0),
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height: Val::Percent(100.0),
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padding: UiRect::all(Val::Px(30.)),
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column_gap: Val::Px(30.),
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flex_wrap: FlexWrap::Wrap,
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..default()
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},
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BackgroundColor(DEEP_SKY_BLUE.into()),
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))
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.with_children(|commands| {
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let example_nodes = [
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(
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Vec2::splat(50.),
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Vec2::ZERO,
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10.,
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0.,
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BorderRadius::bottom_right(Val::Px(10.)),
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),
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(Vec2::new(50., 25.), Vec2::ZERO, 10., 0., BorderRadius::ZERO),
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(Vec2::splat(50.), Vec2::ZERO, 10., 0., BorderRadius::MAX),
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(Vec2::new(100., 25.), Vec2::ZERO, 10., 0., BorderRadius::MAX),
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(
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Vec2::splat(50.),
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Vec2::ZERO,
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10.,
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0.,
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BorderRadius::bottom_right(Val::Px(10.)),
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),
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(Vec2::new(50., 25.), Vec2::ZERO, 0., 10., BorderRadius::ZERO),
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(
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Vec2::splat(50.),
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Vec2::ZERO,
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0.,
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10.,
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BorderRadius::bottom_right(Val::Px(10.)),
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),
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(Vec2::new(100., 25.), Vec2::ZERO, 0., 10., BorderRadius::MAX),
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(
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Vec2::splat(50.),
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Vec2::splat(25.),
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0.,
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0.,
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BorderRadius::ZERO,
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),
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(
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Vec2::new(50., 25.),
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Vec2::splat(25.),
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0.,
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0.,
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BorderRadius::ZERO,
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),
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(
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Vec2::splat(50.),
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Vec2::splat(10.),
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0.,
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0.,
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BorderRadius::bottom_right(Val::Px(10.)),
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),
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(
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Vec2::splat(50.),
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Vec2::splat(25.),
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0.,
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10.,
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BorderRadius::ZERO,
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),
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(
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Vec2::new(50., 25.),
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Vec2::splat(25.),
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0.,
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10.,
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BorderRadius::ZERO,
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),
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(
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Vec2::splat(50.),
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Vec2::splat(10.),
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0.,
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10.,
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BorderRadius::bottom_right(Val::Px(10.)),
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),
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(
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Vec2::splat(50.),
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Vec2::splat(10.),
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0.,
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3.,
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BorderRadius::ZERO,
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),
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(
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Vec2::new(50., 25.),
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Vec2::splat(10.),
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0.,
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3.,
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BorderRadius::ZERO,
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),
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(
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Vec2::splat(50.),
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Vec2::splat(10.),
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0.,
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3.,
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BorderRadius::bottom_right(Val::Px(10.)),
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),
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(
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Vec2::splat(50.),
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Vec2::splat(10.),
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0.,
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3.,
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BorderRadius::all(Val::Px(20.)),
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),
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(
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Vec2::new(50., 25.),
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Vec2::splat(10.),
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0.,
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3.,
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BorderRadius::all(Val::Px(20.)),
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),
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(
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Vec2::new(25., 50.),
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Vec2::splat(10.),
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0.,
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3.,
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BorderRadius::MAX,
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),
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(
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Vec2::splat(50.),
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Vec2::splat(10.),
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0.,
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10.,
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BorderRadius::all(Val::Px(20.)),
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),
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(
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Vec2::new(50., 25.),
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Vec2::splat(10.),
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0.,
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10.,
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BorderRadius::all(Val::Px(20.)),
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),
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(
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Vec2::new(25., 50.),
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Vec2::splat(10.),
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0.,
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10.,
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BorderRadius::MAX,
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),
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];
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for (size, offset, spread, blur, border_radius) in example_nodes {
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commands.spawn(box_shadow_node_bundle(
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size,
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offset,
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spread,
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blur,
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border_radius,
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));
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}
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});
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}
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fn box_shadow_node_bundle(
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size: Vec2,
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offset: Vec2,
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spread: f32,
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blur: f32,
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border_radius: BorderRadius,
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) -> impl Bundle {
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(
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Node {
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width: Val::Px(size.x),
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height: Val::Px(size.y),
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border: UiRect::all(Val::Px(4.)),
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..default()
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},
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BorderColor(LIGHT_SKY_BLUE.into()),
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border_radius,
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BackgroundColor(DEEP_SKY_BLUE.into()),
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BoxShadow {
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color: Color::BLACK.with_alpha(0.8),
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x_offset: Val::Percent(offset.x),
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y_offset: Val::Percent(offset.y),
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spread_radius: Val::Percent(spread),
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blur_radius: Val::Px(blur),
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},
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)
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}
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