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ui.rs
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use bevy::prelude::*;
/// This example illustrates the various features of Bevy UI.
fn main() {
App::build()
.add_default_plugins()
.add_startup_system(setup.system())
.run();
}
fn setup(
mut commands: Commands,
asset_server: Res<AssetServer>,
mut materials: ResMut<Assets<ColorMaterial>>,
) {
commands
// ui camera
.spawn(UiCameraComponents::default())
// root node
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
justify_content: JustifyContent::SpaceBetween,
..Default::default()
},
material: materials.add(Color::NONE.into()),
..Default::default()
})
.with_children(|parent| {
parent
// left vertical fill (border)
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(200.0), Val::Percent(100.0)),
border: Rect::all(Val::Px(2.0)),
..Default::default()
},
material: materials.add(Color::rgb(0.65, 0.65, 0.65).into()),
..Default::default()
})
.with_children(|parent| {
parent
// left vertical fill (content)
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
align_items: AlignItems::FlexEnd,
..Default::default()
},
material: materials.add(Color::rgb(0.15, 0.15, 0.15).into()),
..Default::default()
})
.with_children(|parent| {
// text
parent.spawn(TextComponents {
style: Style {
margin: Rect::all(Val::Px(5.0)),
..Default::default()
},
text: Text {
value: "Text Example".to_string(),
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
style: TextStyle {
font_size: 30.0,
color: Color::WHITE,
},
},
..Default::default()
});
});
})
// right vertical fill
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(200.0), Val::Percent(100.0)),
..Default::default()
},
material: materials.add(Color::rgb(0.15, 0.15, 0.15).into()),
..Default::default()
})
// absolute positioning
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(200.0), Val::Px(200.0)),
position_type: PositionType::Absolute,
position: Rect {
left: Val::Px(210.0),
bottom: Val::Px(10.0),
..Default::default()
},
border: Rect::all(Val::Px(20.0)),
..Default::default()
},
material: materials.add(Color::rgb(0.4, 0.4, 1.0).into()),
..Default::default()
})
.with_children(|parent| {
parent.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
..Default::default()
},
material: materials.add(Color::rgb(0.8, 0.8, 1.0).into()),
..Default::default()
});
})
// render order test: reddest in the back, whitest in the front (flex center)
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
position_type: PositionType::Absolute,
align_items: AlignItems::Center,
justify_content: JustifyContent::Center,
..Default::default()
},
material: materials.add(Color::NONE.into()),
draw: Draw {
is_transparent: true,
..Default::default()
},
..Default::default()
})
.with_children(|parent| {
parent
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(100.0), Val::Px(100.0)),
..Default::default()
},
material: materials.add(Color::rgb(1.0, 0.0, 0.0).into()),
..Default::default()
})
.with_children(|parent| {
parent
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(100.0), Val::Px(100.0)),
position_type: PositionType::Absolute,
position: Rect {
left: Val::Px(20.0),
bottom: Val::Px(20.0),
..Default::default()
},
..Default::default()
},
material: materials.add(Color::rgb(1.0, 0.3, 0.3).into()),
..Default::default()
})
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(100.0), Val::Px(100.0)),
position_type: PositionType::Absolute,
position: Rect {
left: Val::Px(40.0),
bottom: Val::Px(40.0),
..Default::default()
},
..Default::default()
},
material: materials.add(Color::rgb(1.0, 0.5, 0.5).into()),
..Default::default()
})
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(100.0), Val::Px(100.0)),
position_type: PositionType::Absolute,
position: Rect {
left: Val::Px(60.0),
bottom: Val::Px(60.0),
..Default::default()
},
..Default::default()
},
material: materials.add(Color::rgb(1.0, 0.7, 0.7).into()),
..Default::default()
})
// alpha test
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Px(100.0), Val::Px(100.0)),
position_type: PositionType::Absolute,
position: Rect {
left: Val::Px(80.0),
bottom: Val::Px(80.0),
..Default::default()
},
..Default::default()
},
material: materials.add(Color::rgba(1.0, 0.9, 0.9, 0.4).into()),
draw: Draw {
is_transparent: true,
..Default::default()
},
..Default::default()
});
});
})
// bevy logo (flex center)
.spawn(NodeComponents {
style: Style {
size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
position_type: PositionType::Absolute,
justify_content: JustifyContent::Center,
align_items: AlignItems::FlexEnd,
..Default::default()
},
material: materials.add(Color::NONE.into()),
draw: Draw {
is_transparent: true,
..Default::default()
},
..Default::default()
})
.with_children(|parent| {
// bevy logo (image)
parent.spawn(ImageComponents {
style: Style {
size: Size::new(Val::Px(500.0), Val::Auto),
..Default::default()
},
material: materials
.add(asset_server.load("branding/bevy_logo_dark_big.png").into()),
draw: Draw {
is_transparent: true,
..Default::default()
},
..Default::default()
});
});
});
}