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text_wrap_debug.rs
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text_wrap_debug.rs
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//! This example demonstrates text wrapping and use of the `LineBreakOn` property.
use argh::FromArgs;
use bevy::prelude::*;
use bevy::text::BreakLineOn;
use bevy::window::WindowResolution;
use bevy::winit::WinitSettings;
#[derive(FromArgs, Resource)]
/// `text_wrap_debug` demonstrates text wrapping and use of the `LineBreakOn` property
struct Args {
#[argh(option)]
/// window scale factor
scale_factor: Option<f32>,
#[argh(option, default = "1.")]
/// ui scale factor
ui_scale: f32,
}
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 window = if let Some(scale_factor) = args.scale_factor {
Window {
resolution: WindowResolution::default().with_scale_factor_override(scale_factor),
..Default::default()
}
} else {
Window::default()
};
App::new()
.add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(window),
..Default::default()
}))
.insert_resource(WinitSettings::desktop_app())
.insert_resource(UiScale(args.ui_scale))
.add_systems(Startup, spawn)
.run();
}
fn spawn(mut commands: Commands, asset_server: Res<AssetServer>) {
commands.spawn(Camera2dBundle::default());
let text_style = TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 14.0,
..default()
};
let root = commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.),
height: Val::Percent(100.),
flex_direction: FlexDirection::Column,
..Default::default()
},
background_color: Color::BLACK.into(),
..Default::default()
})
.id();
for linebreak_behavior in [
BreakLineOn::AnyCharacter,
BreakLineOn::WordBoundary,
BreakLineOn::NoWrap,
] {
let row_id = commands
.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Row,
justify_content: JustifyContent::SpaceAround,
align_items: AlignItems::Center,
width: Val::Percent(100.),
height: Val::Percent(50.),
..Default::default()
},
..Default::default()
})
.id();
let justifications = vec![
JustifyContent::Center,
JustifyContent::FlexStart,
JustifyContent::FlexEnd,
JustifyContent::SpaceAround,
JustifyContent::SpaceBetween,
JustifyContent::SpaceEvenly,
];
for (i, justification) in justifications.into_iter().enumerate() {
let c = 0.3 + i as f32 * 0.1;
let column_id = commands
.spawn(NodeBundle {
style: Style {
justify_content: justification,
flex_direction: FlexDirection::Column,
width: Val::Percent(16.),
height: Val::Percent(95.),
overflow: Overflow::clip_x(),
..Default::default()
},
background_color: Color::rgb(0.5, c, 1.0 - c).into(),
..Default::default()
})
.id();
let messages = [
format!("JustifyContent::{justification:?}"),
format!("LineBreakOn::{linebreak_behavior:?}"),
"Line 1\nLine 2\nLine 3".to_string(),
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas auctor, nunc ac faucibus fringilla.".to_string(),
];
for (j, message) in messages.into_iter().enumerate() {
let text = Text {
sections: vec![TextSection {
value: message.clone(),
style: text_style.clone(),
}],
justify: JustifyText::Left,
linebreak_behavior,
};
let text_id = commands
.spawn(TextBundle {
text,
background_color: Color::rgb(0.8 - j as f32 * 0.2, 0., 0.).into(),
..Default::default()
})
.id();
commands.entity(column_id).add_child(text_id);
}
commands.entity(row_id).add_child(column_id);
}
commands.entity(root).add_child(row_id);
}
}