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UI text wrapping and LineBreakOn example #7761

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Apr 24, 2023
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9 changes: 9 additions & 0 deletions Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -1603,6 +1603,15 @@ description = "Demonstrates how the AlignItems and JustifyContent properties can
category = "UI (User Interface)"
wasm = false

[[example]]
name = "text_wrap"
path = "examples/ui/text_wrap.rs"

[package.metadata.example.text_wraap]
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name = "Text Wrap"
description = "Demonstrates text wrapping"
category = "UI (User Interface)"
wasm = true

[[example]]
name = "transparency_ui"
Expand Down
107 changes: 107 additions & 0 deletions examples/ui/text_wrap.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,107 @@
//! This example demonstrates text wrapping and use of the `LineBreakOn` property.

use bevy::prelude::*;
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use bevy::text::BreakLineOn;
use bevy::winit::WinitSettings;

fn main() {
App::new()
.add_plugins(DefaultPlugins)
.insert_resource(WinitSettings::desktop_app())
.add_startup_system(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,
color: Color::WHITE,
..Default::default()
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};

let root = commands
.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Column,
size: Size::new(Val::Percent(100.), Val::Percent(100.)),
..Default::default()
},
background_color: Color::BLACK.into(),
..Default::default()
})
.id();

for linebreak_behaviour in [BreakLineOn::AnyCharacter, BreakLineOn::WordBoundary] {
let row_id = commands
.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Row,
justify_content: JustifyContent::SpaceAround,
align_items: AlignItems::Center,
size: Size::new(Val::Percent(100.), 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,
size: Size::new(Val::Percent(16.), Val::Percent(95.)),
overflow: Overflow::Hidden,
..Default::default()
},
background_color: Color::rgb(0.5, c, 1.0 - c).into(),
..Default::default()
})
.id();

let messages = [
format!("JustifyContent::{justification:?}"),
format!("LineBreakOn::{linebreak_behaviour:?}"),
"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(),
}],
alignment: TextAlignment::Left,
linebreak_behaviour,
};
let text_id = commands
.spawn((
TextBundle {
text,
..Default::default()
},
BackgroundColor(Color::rgb(0.8 - j as f32 * 0.2, 0., 0.)),
))
.id();
commands.entity(column_id).add_child(text_id);
}
commands.entity(row_id).add_child(column_id);
}
commands.entity(root).add_child(row_id);
}
}