b641aa0ecf
# Objective allow specifying the left/top/right/bottom border colors separately for ui elements fixes #14773 ## Solution - change `BorderColor` to ```rs pub struct BorderColor { pub left: Color, pub top: Color, pub right: Color, pub bottom: Color, } ``` - generate one ui node per distinct border color, set flags for the active borders - render only the active borders i chose to do this rather than adding multiple colors to the ExtractedUiNode in order to minimize the impact for the common case where all border colors are the same. ## Testing modified the `borders` example to use separate colors:  the behaviour is a bit weird but it mirrors html/css border behaviour. --- ## Migration: To keep the existing behaviour, just change `BorderColor(color)` into `BorderColor::all(color)`. --------- Co-authored-by: ickshonpe <david.curthoys@googlemail.com>
268 lines
8.4 KiB
Rust
268 lines
8.4 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::BLUE;
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use bevy::color::palettes::css::DEEP_SKY_BLUE;
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use bevy::color::palettes::css::GREEN;
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use bevy::color::palettes::css::LIGHT_SKY_BLUE;
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use bevy::color::palettes::css::RED;
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use bevy::color::palettes::css::YELLOW;
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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, BoxShadowSamples(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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// Demonstrate multiple shadows on one node
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commands.spawn((
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Node {
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width: Val::Px(40.),
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height: Val::Px(40.),
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border: UiRect::all(Val::Px(4.)),
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..default()
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},
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BorderColor::all(LIGHT_SKY_BLUE.into()),
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BorderRadius::all(Val::Px(20.)),
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BackgroundColor(DEEP_SKY_BLUE.into()),
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BoxShadow(vec![
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ShadowStyle {
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color: RED.with_alpha(0.7).into(),
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x_offset: Val::Px(-20.),
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y_offset: Val::Px(-5.),
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spread_radius: Val::Percent(10.),
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blur_radius: Val::Px(3.),
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},
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ShadowStyle {
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color: BLUE.with_alpha(0.7).into(),
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x_offset: Val::Px(-5.),
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y_offset: Val::Px(-20.),
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spread_radius: Val::Percent(10.),
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blur_radius: Val::Px(3.),
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},
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ShadowStyle {
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color: YELLOW.with_alpha(0.7).into(),
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x_offset: Val::Px(20.),
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y_offset: Val::Px(5.),
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spread_radius: Val::Percent(10.),
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blur_radius: Val::Px(3.),
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},
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ShadowStyle {
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color: GREEN.with_alpha(0.7).into(),
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x_offset: Val::Px(5.),
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y_offset: Val::Px(20.),
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spread_radius: Val::Percent(10.),
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blur_radius: Val::Px(3.),
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},
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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::all(LIGHT_SKY_BLUE.into()),
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border_radius,
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BackgroundColor(DEEP_SKY_BLUE.into()),
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BoxShadow::new(
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Color::BLACK.with_alpha(0.8),
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Val::Percent(offset.x),
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Val::Percent(offset.y),
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Val::Percent(spread),
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Val::Px(blur),
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),
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)
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}
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