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many_buttons.rs:
//! General UI benchmark that stress tests layouting, text, interaction and rendering
use argh::FromArgs;
use bevy::{
color::palettes::css::ORANGE_RED,
diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
prelude::*,
window::{PresentMode, WindowResolution},
winit::{UpdateMode, WinitSettings},
};
const FONT_SIZE: f32 = 7.0;
#[derive(FromArgs, Resource)]
/// `many_buttons` general UI benchmark that stress tests layouting, text, interaction and rendering
struct Args {
/// whether to add text to each button
#[argh(switch)]
no_text: bool,
/// whether to add borders to each button
#[argh(switch)]
no_borders: bool,
/// whether to perform a full relayout each frame
#[argh(switch)]
relayout: bool,
/// whether to recompute all text each frame
#[argh(switch)]
recompute_text: bool,
/// how many buttons per row and column of the grid.
#[argh(option, default = "110")]
buttons: usize,
/// give every nth button an image
#[argh(option, default = "4")]
image_freq: usize,
/// use the grid layout model
#[argh(switch)]
grid: bool,
}
/// This example shows what happens when there is a lot of buttons on screen.
fn main() {
// `from_env` panics on the web
#[cfg(not(target_arch = "wasm32"))]
let args: Args = argh::from_env();
#[cfg(target_arch = "wasm32")]
let args = Args::from_args(&[], &[]).unwrap();
let mut app = App::new();
app.add_plugins((
DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
present_mode: PresentMode::AutoNoVsync,
resolution: WindowResolution::new(1920.0, 1080.0).with_scale_factor_override(1.0),
..default()
}),
..default()
}),
FrameTimeDiagnosticsPlugin,
LogDiagnosticsPlugin::default(),
))
.insert_resource(WinitSettings {
focused_mode: UpdateMode::Continuous,
unfocused_mode: UpdateMode::Continuous,
})
.add_systems(Update, button_system);
if args.grid {
app.add_systems(Startup, setup_grid);
} else {
app.add_systems(Startup, setup_flex);
}
if args.relayout {
app.add_systems(Update, |mut style_query: Query<&mut Style>| {
style_query
.iter_mut()
.for_each(|mut style| style.set_changed());
});
}
if args.recompute_text {
app.add_systems(Update, |mut text_query: Query<&mut Text>| {
text_query
.iter_mut()
.for_each(|mut text| text.set_changed());
});
}
app.insert_resource(args).run();
}
#[derive(Component)]
struct IdleColor(Color);
fn button_system(
mut interaction_query: Query<
(&Interaction, &mut BackgroundColor, &IdleColor),
Changed<Interaction>,
>,
) {
for (interaction, mut color, &IdleColor(idle_color)) in interaction_query.iter_mut() {
*color = match interaction {
Interaction::Hovered => ORANGE_RED.into(),
_ => idle_color.into(),
};
}
}
fn setup_flex(mut commands: Commands, asset_server: Res<AssetServer>, args: Res<Args>) {
warn!(include_str!("warning_string.txt"));
let image = if 0 < args.image_freq {
Some(asset_server.load("branding/icon.png"))
} else {
None
};
let buttons_f = args.buttons as f32;
let border = if args.no_borders {
UiRect::ZERO
} else {
UiRect::all(Val::VMin(0.05 * 90. / buttons_f))
};
let as_rainbow = |i: usize| Color::hsl((i as f32 / buttons_f) * 360.0, 0.9, 0.8);
commands.spawn(Camera2dBundle::default());
commands
.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Column,
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
width: Val::Percent(100.),
height: Val::Percent(100.),
..default()
},
..default()
})
.with_children(|commands| {
for column in 0..args.buttons {
commands
.spawn(NodeBundle::default())
.with_children(|commands| {
for row in 0..args.buttons {
let color = as_rainbow(row % column.max(1));
let border_color = Color::WHITE.with_alpha(0.5).into();
spawn_button(
commands,
color,
buttons_f,
column,
row,
!args.no_text,
border,
border_color,
image
.as_ref()
.filter(|_| (column + row) % args.image_freq == 0)
.cloned(),
);
}
});
}
});
}
fn setup_grid(mut commands: Commands, asset_server: Res<AssetServer>, args: Res<Args>) {
warn!(include_str!("warning_string.txt"));
let image = if 0 < args.image_freq {
Some(asset_server.load("branding/icon.png"))
} else {
None
};
let buttons_f = args.buttons as f32;
let border = if args.no_borders {
UiRect::ZERO
} else {
UiRect::all(Val::VMin(0.05 * 90. / buttons_f))
};
let as_rainbow = |i: usize| Color::hsl((i as f32 / buttons_f) * 360.0, 0.9, 0.8);
commands.spawn(Camera2dBundle::default());
commands
.spawn(NodeBundle {
style: Style {
display: Display::Grid,
width: Val::Percent(100.),
height: Val::Percent(100.0),
grid_template_columns: RepeatedGridTrack::flex(args.buttons as u16, 1.0),
grid_template_rows: RepeatedGridTrack::flex(args.buttons as u16, 1.0),
..default()
},
..default()
})
.with_children(|commands| {
for column in 0..args.buttons {
for row in 0..args.buttons {
let color = as_rainbow(row % column.max(1));
let border_color = Color::WHITE.with_alpha(0.5).into();
spawn_button(
commands,
color,
buttons_f,
column,
row,
!args.no_text,
border,
border_color,
image
.as_ref()
.filter(|_| (column + row) % args.image_freq == 0)
.cloned(),
);
}
}
});
}
#[allow(clippy::too_many_arguments)]
fn spawn_button(
commands: &mut ChildBuilder,
background_color: Color,
buttons: f32,
column: usize,
row: usize,
spawn_text: bool,
border: UiRect,
border_color: BorderColor,
image: Option<Handle<Image>>,
) {
let width = Val::Vw(90.0 / buttons);
let height = Val::Vh(90.0 / buttons);
let margin = UiRect::axes(width * 0.05, height * 0.05);
let mut builder = commands.spawn((
ButtonBundle {
style: Style {
width,
height,
margin,
align_items: AlignItems::Center,
justify_content: JustifyContent::Center,
border,
..default()
},
background_color: background_color.into(),
border_color,
..default()
},
IdleColor(background_color),
));
if let Some(image) = image {
builder.insert(UiImage::new(image));
}
if spawn_text {
builder.with_children(|parent| {
parent.spawn(TextBundle::from_section(
format!("{column}, {row}"),
TextStyle {
font_size: FONT_SIZE,
color: Color::srgb(0.2, 0.2, 0.2),
..default()
},
));
});
}
}