019a6fde25
# Objective - have a testbed for UI ## Solution - move previous `ui` example to `full_ui` - add a testbed ui with several scenes - `ui_layout_rounding` is one of those scenes, so remove it as a standalone example the previous `ui` / new `full_ui` is I think still useful as it has some things like scroll, debug ui that are not shown anywhere else
437 lines
19 KiB
Rust
437 lines
19 KiB
Rust
//! This example illustrates the various features of Bevy UI.
|
|
|
|
use std::f32::consts::PI;
|
|
|
|
use accesskit::{Node as Accessible, Role};
|
|
use bevy::{
|
|
a11y::AccessibilityNode,
|
|
color::palettes::{basic::LIME, css::DARK_GRAY},
|
|
input::mouse::{MouseScrollUnit, MouseWheel},
|
|
picking::hover::HoverMap,
|
|
prelude::*,
|
|
ui::widget::NodeImageMode,
|
|
};
|
|
|
|
fn main() {
|
|
let mut app = App::new();
|
|
app.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, update_scroll_position);
|
|
|
|
#[cfg(feature = "bevy_ui_debug")]
|
|
app.add_systems(Update, toggle_debug_overlay);
|
|
|
|
app.run();
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
// Camera
|
|
commands.spawn((Camera2d, IsDefaultUiCamera, BoxShadowSamples(6)));
|
|
|
|
// root node
|
|
commands
|
|
.spawn(Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
justify_content: JustifyContent::SpaceBetween,
|
|
..default()
|
|
})
|
|
.insert(Pickable::IGNORE)
|
|
.with_children(|parent| {
|
|
// left vertical fill (border)
|
|
parent
|
|
.spawn((
|
|
Node {
|
|
width: Val::Px(200.),
|
|
border: UiRect::all(Val::Px(2.)),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(0.65, 0.65, 0.65)),
|
|
))
|
|
.with_children(|parent| {
|
|
// left vertical fill (content)
|
|
parent
|
|
.spawn((
|
|
Node {
|
|
width: Val::Percent(100.),
|
|
flex_direction: FlexDirection::Column,
|
|
padding: UiRect::all(Val::Px(5.)),
|
|
row_gap: Val::Px(5.),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(0.15, 0.15, 0.15)),
|
|
Visibility::Visible,
|
|
))
|
|
.with_children(|parent| {
|
|
// text
|
|
parent.spawn((
|
|
Text::new("Text Example"),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 25.0,
|
|
..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_ui_debug")]
|
|
{
|
|
// Debug overlay text
|
|
parent.spawn((
|
|
Text::new("Press Space to toggle debug outlines."),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
..default()
|
|
},
|
|
Label,
|
|
));
|
|
|
|
parent.spawn((
|
|
Text::new("V: toggle UI root's visibility"),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 12.,
|
|
..default()
|
|
},
|
|
Label,
|
|
));
|
|
|
|
parent.spawn((
|
|
Text::new("S: toggle outlines for hidden nodes"),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 12.,
|
|
..default()
|
|
},
|
|
Label,
|
|
));
|
|
parent.spawn((
|
|
Text::new("C: toggle outlines for clipped nodes"),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 12.,
|
|
..default()
|
|
},
|
|
Label,
|
|
));
|
|
}
|
|
#[cfg(not(feature = "bevy_ui_debug"))]
|
|
parent.spawn((
|
|
Text::new("Try enabling feature \"bevy_ui_debug\"."),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
..default()
|
|
},
|
|
Label,
|
|
));
|
|
});
|
|
});
|
|
// right vertical fill
|
|
parent
|
|
.spawn(Node {
|
|
flex_direction: FlexDirection::Column,
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::Center,
|
|
width: Val::Px(200.),
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// Title
|
|
parent.spawn((
|
|
Text::new("Scrolling list"),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 21.,
|
|
..default()
|
|
},
|
|
Label,
|
|
));
|
|
// Scrolling list
|
|
parent
|
|
.spawn((
|
|
Node {
|
|
flex_direction: FlexDirection::Column,
|
|
align_self: AlignSelf::Stretch,
|
|
height: Val::Percent(50.),
|
|
overflow: Overflow::scroll_y(),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(0.10, 0.10, 0.10)),
|
|
))
|
|
.with_children(|parent| {
|
|
// List items
|
|
for i in 0..25 {
|
|
parent
|
|
.spawn((
|
|
Text(format!("Item {i}")),
|
|
TextFont {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
..default()
|
|
},
|
|
Label,
|
|
AccessibilityNode(Accessible::new(Role::ListItem)),
|
|
))
|
|
.insert(Pickable {
|
|
should_block_lower: false,
|
|
..default()
|
|
});
|
|
}
|
|
});
|
|
});
|
|
|
|
parent
|
|
.spawn(Node {
|
|
left: Val::Px(210.),
|
|
bottom: Val::Px(10.),
|
|
position_type: PositionType::Absolute,
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn((
|
|
Node {
|
|
width: Val::Px(200.0),
|
|
height: Val::Px(200.0),
|
|
border: UiRect::all(Val::Px(20.)),
|
|
flex_direction: FlexDirection::Column,
|
|
justify_content: JustifyContent::Center,
|
|
..default()
|
|
},
|
|
BorderColor(LIME.into()),
|
|
BackgroundColor(Color::srgb(0.8, 0.8, 1.)),
|
|
))
|
|
.with_children(|parent| {
|
|
parent.spawn((
|
|
ImageNode::new(asset_server.load("branding/bevy_logo_light.png")),
|
|
// Uses the transform to rotate the logo image by 45 degrees
|
|
Transform::from_rotation(Quat::from_rotation_z(0.25 * PI)),
|
|
BorderRadius::all(Val::Px(10.)),
|
|
Outline {
|
|
width: Val::Px(2.),
|
|
offset: Val::Px(4.),
|
|
color: DARK_GRAY.into(),
|
|
},
|
|
));
|
|
});
|
|
});
|
|
|
|
let shadow_style = ShadowStyle {
|
|
color: Color::BLACK.with_alpha(0.5),
|
|
blur_radius: Val::Px(2.),
|
|
x_offset: Val::Px(10.),
|
|
y_offset: Val::Px(10.),
|
|
..default()
|
|
};
|
|
|
|
// render order test: reddest in the back, whitest in the front (flex center)
|
|
parent
|
|
.spawn(Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
..default()
|
|
})
|
|
.insert(Pickable::IGNORE)
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn((
|
|
Node {
|
|
width: Val::Px(100.0),
|
|
height: Val::Px(100.0),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(1.0, 0.0, 0.)),
|
|
BoxShadow::from(shadow_style),
|
|
))
|
|
.with_children(|parent| {
|
|
parent.spawn((
|
|
Node {
|
|
// 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()
|
|
},
|
|
BackgroundColor(Color::srgb(1.0, 0.3, 0.3)),
|
|
BoxShadow::from(shadow_style),
|
|
));
|
|
parent.spawn((
|
|
Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(40.),
|
|
bottom: Val::Px(40.),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(1.0, 0.5, 0.5)),
|
|
BoxShadow::from(shadow_style),
|
|
));
|
|
parent.spawn((
|
|
Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(60.),
|
|
bottom: Val::Px(60.),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgb(0.0, 0.7, 0.7)),
|
|
BoxShadow::from(shadow_style),
|
|
));
|
|
// alpha test
|
|
parent.spawn((
|
|
Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
left: Val::Px(80.),
|
|
bottom: Val::Px(80.),
|
|
..default()
|
|
},
|
|
BackgroundColor(Color::srgba(1.0, 0.9, 0.9, 0.4)),
|
|
BoxShadow::from(ShadowStyle {
|
|
color: Color::BLACK.with_alpha(0.3),
|
|
..shadow_style
|
|
}),
|
|
));
|
|
});
|
|
});
|
|
// bevy logo (flex center)
|
|
parent
|
|
.spawn(Node {
|
|
width: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::FlexStart,
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
// bevy logo (image)
|
|
parent
|
|
.spawn((
|
|
ImageNode::new(asset_server.load("branding/bevy_logo_dark_big.png"))
|
|
.with_mode(NodeImageMode::Stretch),
|
|
Node {
|
|
width: Val::Px(500.0),
|
|
height: Val::Px(125.0),
|
|
margin: UiRect::top(Val::VMin(5.)),
|
|
..default()
|
|
},
|
|
))
|
|
.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((
|
|
Node {
|
|
display: Display::None,
|
|
..default()
|
|
},
|
|
Text::new("Bevy logo"),
|
|
));
|
|
});
|
|
});
|
|
|
|
// four bevy icons demonstrating image flipping
|
|
parent
|
|
.spawn(Node {
|
|
width: Val::Percent(100.0),
|
|
height: Val::Percent(100.0),
|
|
position_type: PositionType::Absolute,
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::FlexEnd,
|
|
column_gap: Val::Px(10.),
|
|
padding: UiRect::all(Val::Px(10.)),
|
|
..default()
|
|
})
|
|
.insert(Pickable::IGNORE)
|
|
.with_children(|parent| {
|
|
for (flip_x, flip_y) in
|
|
[(false, false), (false, true), (true, true), (true, false)]
|
|
{
|
|
parent.spawn((
|
|
ImageNode {
|
|
image: asset_server.load("branding/icon.png"),
|
|
flip_x,
|
|
flip_y,
|
|
..default()
|
|
},
|
|
Node {
|
|
// The height will be chosen automatically to preserve the image's aspect ratio
|
|
width: Val::Px(75.),
|
|
..default()
|
|
},
|
|
));
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
#[cfg(feature = "bevy_ui_debug")]
|
|
// The system that will enable/disable the debug outlines around the nodes
|
|
fn toggle_debug_overlay(
|
|
input: Res<ButtonInput<KeyCode>>,
|
|
mut debug_options: ResMut<UiDebugOptions>,
|
|
mut root_node_query: Query<&mut Visibility, (With<Node>, Without<ChildOf>)>,
|
|
) {
|
|
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
|
|
debug_options.toggle();
|
|
}
|
|
|
|
if input.just_pressed(KeyCode::KeyS) {
|
|
// Toggle debug outlines for nodes with `ViewVisibility` set to false.
|
|
debug_options.show_hidden = !debug_options.show_hidden;
|
|
}
|
|
|
|
if input.just_pressed(KeyCode::KeyC) {
|
|
// Toggle outlines for clipped UI nodes.
|
|
debug_options.show_clipped = !debug_options.show_clipped;
|
|
}
|
|
|
|
if input.just_pressed(KeyCode::KeyV) {
|
|
for mut visibility in root_node_query.iter_mut() {
|
|
// Toggle the UI root node's visibility
|
|
visibility.toggle_inherited_hidden();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Updates the scroll position of scrollable nodes in response to mouse input
|
|
pub fn update_scroll_position(
|
|
mut mouse_wheel_events: EventReader<MouseWheel>,
|
|
hover_map: Res<HoverMap>,
|
|
mut scrolled_node_query: Query<&mut ScrollPosition>,
|
|
keyboard_input: Res<ButtonInput<KeyCode>>,
|
|
) {
|
|
for mouse_wheel_event in mouse_wheel_events.read() {
|
|
let (mut dx, mut dy) = match mouse_wheel_event.unit {
|
|
MouseScrollUnit::Line => (mouse_wheel_event.x * 20., mouse_wheel_event.y * 20.),
|
|
MouseScrollUnit::Pixel => (mouse_wheel_event.x, mouse_wheel_event.y),
|
|
};
|
|
|
|
if keyboard_input.pressed(KeyCode::ShiftLeft) || keyboard_input.pressed(KeyCode::ShiftRight)
|
|
{
|
|
std::mem::swap(&mut dx, &mut dy);
|
|
}
|
|
|
|
for (_pointer, pointer_map) in hover_map.iter() {
|
|
for (entity, _hit) in pointer_map.iter() {
|
|
if let Ok(mut scroll_position) = scrolled_node_query.get_mut(*entity) {
|
|
scroll_position.offset_x -= dx;
|
|
scroll_position.offset_y -= dy;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|