133 lines
3.8 KiB
Rust
133 lines
3.8 KiB
Rust
//! This example shows what happens when there is a lot of buttons on screen.
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//!
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//! To start the demo without text run
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//! `cargo run --example many_buttons --release no-text`
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use bevy::{
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diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
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prelude::*,
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window::{PresentMode, WindowPlugin},
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};
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// For a total of 110 * 110 = 12100 buttons with text
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const ROW_COLUMN_COUNT: usize = 110;
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const FONT_SIZE: f32 = 7.0;
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/// This example shows what happens when there is a lot of buttons on screen.
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins.set(WindowPlugin {
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primary_window: Some(Window {
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present_mode: PresentMode::Immediate,
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..default()
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}),
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..default()
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}))
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.add_plugin(FrameTimeDiagnosticsPlugin::default())
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.add_plugin(LogDiagnosticsPlugin::default())
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.init_resource::<UiFont>()
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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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#[derive(Component)]
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struct IdleColor(BackgroundColor);
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fn button_system(
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mut interaction_query: Query<
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(&Interaction, &mut BackgroundColor, &IdleColor),
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Changed<Interaction>,
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>,
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) {
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for (interaction, mut material, IdleColor(idle_color)) in interaction_query.iter_mut() {
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if matches!(interaction, Interaction::Hovered) {
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*material = Color::ORANGE_RED.into();
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} else {
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*material = *idle_color;
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}
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}
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}
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#[derive(Resource)]
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struct UiFont(Handle<Font>);
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impl FromWorld for UiFont {
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fn from_world(world: &mut World) -> Self {
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let asset_server = world.resource::<AssetServer>();
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UiFont(asset_server.load("fonts/FiraSans-Bold.ttf"))
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}
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}
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fn setup(mut commands: Commands, font: Res<UiFont>) {
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let count = ROW_COLUMN_COUNT;
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let count_f = count as f32;
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let as_rainbow = |i: usize| Color::hsl((i as f32 / count_f) * 360.0, 0.9, 0.8);
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commands.spawn(Camera2dBundle::default());
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commands
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.spawn(NodeBundle {
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style: Style {
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size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
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..default()
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},
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..default()
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})
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.with_children(|commands| {
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let spawn_text = std::env::args().nth(1).as_deref() != Some("no-text");
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for i in 0..count {
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for j in 0..count {
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let color = as_rainbow(j % i.max(1)).into();
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spawn_button(
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commands,
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font.0.clone_weak(),
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color,
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count_f,
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i,
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j,
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spawn_text,
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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 spawn_button(
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commands: &mut ChildBuilder,
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font: Handle<Font>,
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color: BackgroundColor,
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total: f32,
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i: usize,
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j: usize,
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spawn_text: bool,
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) {
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let width = 90.0 / total;
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let mut builder = commands.spawn((
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ButtonBundle {
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style: Style {
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size: Size::new(Val::Percent(width), Val::Percent(width)),
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bottom: Val::Percent(100.0 / total * i as f32),
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left: Val::Percent(100.0 / total * j as f32),
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align_items: AlignItems::Center,
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position_type: PositionType::Absolute,
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..default()
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},
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background_color: color,
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..default()
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},
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IdleColor(color),
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));
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if spawn_text {
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builder.with_children(|commands| {
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commands.spawn(TextBundle::from_section(
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format!("{i}, {j}"),
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TextStyle {
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font,
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font_size: FONT_SIZE,
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color: Color::rgb(0.2, 0.2, 0.2),
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},
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));
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});
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}
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}
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