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widgets.rs
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widgets.rs
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//! Helper traits for creating common widgets.
use bevy::{ecs::system::EntityCommands, prelude::*, ui::Val::*};
use crate::theme::{interaction::InteractionPalette, palette::*};
/// An extension trait for spawning UI widgets.
pub trait Widgets {
/// Spawn a simple button with text.
fn button(&mut self, text: impl Into<String>) -> EntityCommands;
/// Spawn a simple header label. Bigger than [`Widgets::label`].
fn header(&mut self, text: impl Into<String>) -> EntityCommands;
/// Spawn a simple text label.
fn label(&mut self, text: impl Into<String>) -> EntityCommands;
}
impl<T: Spawn> Widgets for T {
fn button(&mut self, text: impl Into<String>) -> EntityCommands {
let mut entity = self.spawn((
Name::new("Button"),
ButtonBundle {
style: Style {
width: Px(200.0),
height: Px(65.0),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
..default()
},
background_color: BackgroundColor(NODE_BACKGROUND),
..default()
},
InteractionPalette {
none: NODE_BACKGROUND,
hovered: BUTTON_HOVERED_BACKGROUND,
pressed: BUTTON_PRESSED_BACKGROUND,
},
));
entity.with_children(|children| {
children.spawn((
Name::new("Button Text"),
TextBundle::from_section(
text,
TextStyle {
font_size: 40.0,
color: BUTTON_TEXT,
..default()
},
),
));
});
entity
}
fn header(&mut self, text: impl Into<String>) -> EntityCommands {
let mut entity = self.spawn((
Name::new("Header"),
NodeBundle {
style: Style {
width: Px(500.0),
height: Px(65.0),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
..default()
},
background_color: BackgroundColor(NODE_BACKGROUND),
..default()
},
));
entity.with_children(|children| {
children.spawn((
Name::new("Header Text"),
TextBundle::from_section(
text,
TextStyle {
font_size: 40.0,
color: HEADER_TEXT,
..default()
},
),
));
});
entity
}
fn label(&mut self, text: impl Into<String>) -> EntityCommands {
let entity = self.spawn((
Name::new("Label"),
TextBundle::from_section(
text,
TextStyle {
font_size: 24.0,
color: LABEL_TEXT,
..default()
},
)
.with_style(Style {
width: Px(500.0),
..default()
}),
));
entity
}
}
/// An extension trait for spawning UI containers.
pub trait Containers {
/// Spawns a root node that covers the full screen
/// and centers its content horizontally and vertically.
fn ui_root(&mut self) -> EntityCommands;
}
impl Containers for Commands<'_, '_> {
fn ui_root(&mut self) -> EntityCommands {
self.spawn((
Name::new("UI Root"),
NodeBundle {
style: Style {
width: Percent(100.0),
height: Percent(100.0),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
flex_direction: FlexDirection::Column,
row_gap: Px(10.0),
position_type: PositionType::Absolute,
..default()
},
..default()
},
))
}
}
/// An internal trait for types that can spawn entities.
/// This is here so that [`Widgets`] can be implemented on all types that
/// are able to spawn entities.
/// Ideally, this trait should be [part of Bevy itself](https://github.com/bevyengine/bevy/issues/14231).
trait Spawn {
fn spawn<B: Bundle>(&mut self, bundle: B) -> EntityCommands;
}
impl Spawn for Commands<'_, '_> {
fn spawn<B: Bundle>(&mut self, bundle: B) -> EntityCommands {
self.spawn(bundle)
}
}
impl Spawn for ChildBuilder<'_> {
fn spawn<B: Bundle>(&mut self, bundle: B) -> EntityCommands {
self.spawn(bundle)
}
}