877d278785
# Objective Including `use<>` where it is not needed is abhorrent to my sensibilities ## Solution Begone foul demon!
112 lines
3.6 KiB
Rust
112 lines
3.6 KiB
Rust
//! This example illustrates how to create a button that changes color and text based on its
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//! interaction state.
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use bevy::{color::palettes::basic::*, input_focus::InputFocus, prelude::*, winit::WinitSettings};
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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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// `InputFocus` must be set for accessibility to recognize the button.
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.init_resource::<InputFocus>()
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.add_systems(Startup, setup)
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.add_systems(Update, button_system)
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.run();
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}
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const NORMAL_BUTTON: Color = Color::srgb(0.15, 0.15, 0.15);
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const HOVERED_BUTTON: Color = Color::srgb(0.25, 0.25, 0.25);
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const PRESSED_BUTTON: Color = Color::srgb(0.35, 0.75, 0.35);
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fn button_system(
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mut input_focus: ResMut<InputFocus>,
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mut interaction_query: Query<
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(
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Entity,
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&Interaction,
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&mut BackgroundColor,
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&mut BorderColor,
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&mut Button,
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&Children,
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),
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Changed<Interaction>,
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>,
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mut text_query: Query<&mut Text>,
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) {
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for (entity, interaction, mut color, mut border_color, mut button, children) in
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&mut interaction_query
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{
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let mut text = text_query.get_mut(children[0]).unwrap();
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match *interaction {
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Interaction::Pressed => {
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input_focus.set(entity);
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**text = "Press".to_string();
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*color = PRESSED_BUTTON.into();
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*border_color = BorderColor::all(RED.into());
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// The accessibility system's only update the button's state when the `Button` component is marked as changed.
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button.set_changed();
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}
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Interaction::Hovered => {
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input_focus.set(entity);
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**text = "Hover".to_string();
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*color = HOVERED_BUTTON.into();
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*border_color = BorderColor::all(Color::WHITE);
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button.set_changed();
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}
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Interaction::None => {
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input_focus.clear();
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**text = "Button".to_string();
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*color = NORMAL_BUTTON.into();
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*border_color = BorderColor::all(Color::BLACK);
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}
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}
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}
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}
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fn setup(mut commands: Commands, assets: Res<AssetServer>) {
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// ui camera
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commands.spawn(Camera2d);
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commands.spawn(button(&assets));
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}
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fn button(asset_server: &AssetServer) -> impl Bundle {
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(
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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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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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..default()
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},
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children![(
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Button,
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Node {
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width: Val::Px(150.0),
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height: Val::Px(65.0),
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border: UiRect::all(Val::Px(5.0)),
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// horizontally center child text
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justify_content: JustifyContent::Center,
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// vertically center child text
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align_items: AlignItems::Center,
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..default()
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},
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BorderColor::all(Color::WHITE),
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BorderRadius::MAX,
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BackgroundColor(Color::BLACK),
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children![(
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Text::new("Button"),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 33.0,
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..default()
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},
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TextColor(Color::srgb(0.9, 0.9, 0.9)),
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TextShadow::default(),
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)]
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)],
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)
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}
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