mirror of
https://github.com/bevyengine/bevy
synced 2024-11-22 20:53:53 +00:00
4edd782f0b
# Objective #11237 added some new text to the UI example. Unlike the other text sharing the same container just above, this new text has no padding and straddles the edge of the screen. ## Solution Move the padding to the container, and add `row_gap` so nodes placed in the container get some vertical separation as well. Before / After <img width="320" alt="12567-before (1)" src="https://github.com/bevyengine/bevy/assets/200550/de0aa142-c715-4c57-b607-d1bdc5d20a01"> <img width="320" alt="12567-after" src="https://github.com/bevyengine/bevy/assets/200550/70b5c9db-9cb2-4f92-88b0-83590ea838b0">
382 lines
17 KiB
Rust
382 lines
17 KiB
Rust
//! This example illustrates the various features of Bevy UI.
|
|
|
|
use bevy::{
|
|
a11y::{
|
|
accesskit::{NodeBuilder, Role},
|
|
AccessibilityNode,
|
|
},
|
|
color::palettes::basic::LIME,
|
|
input::mouse::{MouseScrollUnit, MouseWheel},
|
|
prelude::*,
|
|
winit::WinitSettings,
|
|
};
|
|
|
|
fn main() {
|
|
let mut app = App::new();
|
|
app.add_plugins(DefaultPlugins)
|
|
// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
|
|
.insert_resource(WinitSettings::desktop_app())
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, mouse_scroll);
|
|
|
|
#[cfg(feature = "bevy_dev_tools")]
|
|
{
|
|
app.add_plugins(bevy::dev_tools::ui_debug_overlay::DebugUiPlugin)
|
|
.add_systems(Update, toggle_overlay);
|
|
}
|
|
|
|
app.run();
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
// Camera
|
|
commands.spawn((Camera2dBundle::default(), IsDefaultUiCamera));
|
|
|
|
// root node
|
|
commands
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
justify_content: JustifyContent::SpaceBetween,
|
|
..default()
|
|
},
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// left vertical fill (border)
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Px(200.),
|
|
border: UiRect::all(Val::Px(2.)),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(0.65, 0.65, 0.65).into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// left vertical fill (content)
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.),
|
|
flex_direction: FlexDirection::Column,
|
|
padding: UiRect::all(Val::Px(5.)),
|
|
row_gap: Val::Px(5.),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(0.15, 0.15, 0.15).into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// text
|
|
parent.spawn((
|
|
TextBundle::from_section(
|
|
"Text Example",
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 30.0,
|
|
..default()
|
|
},
|
|
),
|
|
// Because this is a distinct label widget and
|
|
// not button/list item text, this is necessary
|
|
// for accessibility to treat the text accordingly.
|
|
Label,
|
|
));
|
|
|
|
#[cfg(feature = "bevy_dev_tools")]
|
|
// Debug overlay text
|
|
parent.spawn((
|
|
TextBundle::from_section(
|
|
"Press Space to enable debug outlines.",
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 20.,
|
|
..Default::default()
|
|
},
|
|
),
|
|
Label,
|
|
));
|
|
|
|
#[cfg(not(feature = "bevy_dev_tools"))]
|
|
parent.spawn((
|
|
TextBundle::from_section(
|
|
"Try enabling feature \"bevy_dev_tools\".",
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 20.,
|
|
..Default::default()
|
|
},
|
|
),
|
|
Label,
|
|
));
|
|
});
|
|
});
|
|
// right vertical fill
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Column,
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::Center,
|
|
width: Val::Px(200.),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(0.15, 0.15, 0.15).into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// Title
|
|
parent.spawn((
|
|
TextBundle::from_section(
|
|
"Scrolling list",
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 25.,
|
|
..default()
|
|
},
|
|
),
|
|
Label,
|
|
));
|
|
// List with hidden overflow
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Column,
|
|
align_self: AlignSelf::Stretch,
|
|
height: Val::Percent(50.),
|
|
overflow: Overflow::clip_y(),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(0.10, 0.10, 0.10).into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// Moving panel
|
|
parent
|
|
.spawn((
|
|
NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Column,
|
|
align_items: AlignItems::Center,
|
|
..default()
|
|
},
|
|
..default()
|
|
},
|
|
ScrollingList::default(),
|
|
AccessibilityNode(NodeBuilder::new(Role::List)),
|
|
))
|
|
.with_children(|parent| {
|
|
// List items
|
|
for i in 0..30 {
|
|
parent.spawn((
|
|
TextBundle::from_section(
|
|
format!("Item {i}"),
|
|
TextStyle {
|
|
font: asset_server
|
|
.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 20.,
|
|
..default()
|
|
},
|
|
),
|
|
Label,
|
|
AccessibilityNode(NodeBuilder::new(Role::ListItem)),
|
|
));
|
|
}
|
|
});
|
|
});
|
|
});
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Px(200.0),
|
|
height: Val::Px(200.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(210.),
|
|
bottom: Val::Px(10.),
|
|
border: UiRect::all(Val::Px(20.)),
|
|
..default()
|
|
},
|
|
border_color: LIME.into(),
|
|
background_color: Color::srgb(0.4, 0.4, 1.).into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(0.8, 0.8, 1.).into(),
|
|
..default()
|
|
});
|
|
});
|
|
// render order test: reddest in the back, whitest in the front (flex center)
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
..default()
|
|
},
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Px(100.0),
|
|
height: Val::Px(100.0),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(1.0, 0.0, 0.).into(),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn(NodeBundle {
|
|
style: Style {
|
|
// Take the size of the parent node.
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(20.),
|
|
bottom: Val::Px(20.),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(1.0, 0.3, 0.3).into(),
|
|
..default()
|
|
});
|
|
parent.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(40.),
|
|
bottom: Val::Px(40.),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(1.0, 0.5, 0.5).into(),
|
|
..default()
|
|
});
|
|
parent.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(60.),
|
|
bottom: Val::Px(60.),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(1.0, 0.7, 0.7).into(),
|
|
..default()
|
|
});
|
|
// alpha test
|
|
parent.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(80.),
|
|
bottom: Val::Px(80.),
|
|
..default()
|
|
},
|
|
background_color: Color::srgba(1.0, 0.9, 0.9, 0.4).into(),
|
|
..default()
|
|
});
|
|
});
|
|
});
|
|
// bevy logo (flex center)
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::FlexStart,
|
|
..default()
|
|
},
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// bevy logo (image)
|
|
// A `NodeBundle` is used to display the logo the image as an `ImageBundle` can't automatically
|
|
// size itself with a child node present.
|
|
parent
|
|
.spawn((
|
|
NodeBundle {
|
|
style: Style {
|
|
width: Val::Px(500.0),
|
|
height: Val::Px(125.0),
|
|
margin: UiRect::top(Val::VMin(5.)),
|
|
..default()
|
|
},
|
|
..default()
|
|
},
|
|
UiImage::new(asset_server.load("branding/bevy_logo_dark_big.png")),
|
|
))
|
|
.with_children(|parent| {
|
|
// alt text
|
|
// This UI node takes up no space in the layout and the `Text` component is used by the accessibility module
|
|
// and is not rendered.
|
|
parent.spawn((
|
|
NodeBundle {
|
|
style: Style {
|
|
display: Display::None,
|
|
..Default::default()
|
|
},
|
|
..Default::default()
|
|
},
|
|
Text::from_section("Bevy logo", TextStyle::default()),
|
|
));
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
#[derive(Component, Default)]
|
|
struct ScrollingList {
|
|
position: f32,
|
|
}
|
|
|
|
fn mouse_scroll(
|
|
mut mouse_wheel_events: EventReader<MouseWheel>,
|
|
mut query_list: Query<(&mut ScrollingList, &mut Style, &Parent, &Node)>,
|
|
query_node: Query<&Node>,
|
|
) {
|
|
for mouse_wheel_event in mouse_wheel_events.read() {
|
|
for (mut scrolling_list, mut style, parent, list_node) in &mut query_list {
|
|
let items_height = list_node.size().y;
|
|
let container_height = query_node.get(parent.get()).unwrap().size().y;
|
|
|
|
let max_scroll = (items_height - container_height).max(0.);
|
|
|
|
let dy = match mouse_wheel_event.unit {
|
|
MouseScrollUnit::Line => mouse_wheel_event.y * 20.,
|
|
MouseScrollUnit::Pixel => mouse_wheel_event.y,
|
|
};
|
|
|
|
scrolling_list.position += dy;
|
|
scrolling_list.position = scrolling_list.position.clamp(-max_scroll, 0.);
|
|
style.top = Val::Px(scrolling_list.position);
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "bevy_dev_tools")]
|
|
// The system that will enable/disable the debug outlines around the nodes
|
|
fn toggle_overlay(
|
|
input: Res<ButtonInput<KeyCode>>,
|
|
mut options: ResMut<bevy::dev_tools::ui_debug_overlay::UiDebugOptions>,
|
|
) {
|
|
info_once!("The debug outlines are enabled, press Space to turn them on/off");
|
|
if input.just_pressed(KeyCode::Space) {
|
|
// The toggle method will enable the debug_overlay if disabled and disable if enabled
|
|
options.toggle();
|
|
}
|
|
}
|