mirror of
https://github.com/bevyengine/bevy
synced 2024-11-10 15:14:50 +00:00
89cbc78d3d
# Objective Be consistent with `Resource`s and `Components` and have `Event` types be more self-documenting. Although not susceptible to accidentally using a function instead of a value due to `Event`s only being initialized by their type, much of the same reasoning for removing the blanket impl on `Resource` also applies here. * Not immediately obvious if a type is intended to be an event * Prevent invisible conflicts if the same third-party or primitive types are used as events * Allows for further extensions (e.g. opt-in warning for missed events) ## Solution Remove the blanket impl for the `Event` trait. Add a derive macro for it. --- ## Changelog - `Event` is no longer implemented for all applicable types. Add the `#[derive(Event)]` macro for events. ## Migration Guide * Add the `#[derive(Event)]` macro for events. Third-party types used as events should be wrapped in a newtype.
401 lines
15 KiB
Rust
401 lines
15 KiB
Rust
//! Demonstrates how the to use the size constraints to control the size of a UI node.
|
|
|
|
use bevy::prelude::*;
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_event::<ButtonActivatedEvent>()
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, (update_buttons, update_radio_buttons_colors))
|
|
.run();
|
|
}
|
|
|
|
const ACTIVE_BORDER_COLOR: Color = Color::ANTIQUE_WHITE;
|
|
const INACTIVE_BORDER_COLOR: Color = Color::BLACK;
|
|
|
|
const ACTIVE_INNER_COLOR: Color = Color::WHITE;
|
|
const INACTIVE_INNER_COLOR: Color = Color::NAVY;
|
|
|
|
const ACTIVE_TEXT_COLOR: Color = Color::BLACK;
|
|
const HOVERED_TEXT_COLOR: Color = Color::WHITE;
|
|
const UNHOVERED_TEXT_COLOR: Color = Color::GRAY;
|
|
|
|
#[derive(Component)]
|
|
struct Bar;
|
|
|
|
#[derive(Copy, Clone, Debug, Component, PartialEq)]
|
|
enum Constraint {
|
|
FlexBasis,
|
|
Width,
|
|
MinWidth,
|
|
MaxWidth,
|
|
}
|
|
|
|
#[derive(Copy, Clone, Component)]
|
|
struct ButtonValue(Val);
|
|
|
|
#[derive(Event)]
|
|
struct ButtonActivatedEvent(Entity);
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
// ui camera
|
|
commands.spawn(Camera2dBundle::default());
|
|
|
|
let text_style = TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 40.0,
|
|
color: Color::rgb(0.9, 0.9, 0.9),
|
|
};
|
|
|
|
commands
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_basis: Val::Percent(100.0),
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::Center,
|
|
..Default::default()
|
|
},
|
|
background_color: Color::BLACK.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Column,
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
..Default::default()
|
|
},
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn(
|
|
TextBundle::from_section("Size Constraints Example", text_style.clone())
|
|
.with_style(Style {
|
|
margin: UiRect::bottom(Val::Px(25.)),
|
|
..Default::default()
|
|
}),
|
|
);
|
|
|
|
spawn_bar(parent);
|
|
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Column,
|
|
align_items: AlignItems::Stretch,
|
|
padding: UiRect::all(Val::Px(10.)),
|
|
margin: UiRect::top(Val::Px(50.)),
|
|
..Default::default()
|
|
},
|
|
background_color: Color::YELLOW.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
for constaint in [
|
|
Constraint::MinWidth,
|
|
Constraint::FlexBasis,
|
|
Constraint::Width,
|
|
Constraint::MaxWidth,
|
|
] {
|
|
spawn_button_row(parent, constaint, text_style.clone());
|
|
}
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
fn spawn_bar(parent: &mut ChildBuilder) {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_basis: Val::Percent(100.0),
|
|
align_self: AlignSelf::Stretch,
|
|
padding: UiRect::all(Val::Px(10.)),
|
|
..Default::default()
|
|
},
|
|
background_color: Color::YELLOW.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
align_items: AlignItems::Stretch,
|
|
width: Val::Percent(100.),
|
|
height: Val::Px(100.),
|
|
padding: UiRect::all(Val::Px(4.)),
|
|
..Default::default()
|
|
},
|
|
background_color: Color::BLACK.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn((
|
|
NodeBundle {
|
|
style: Style {
|
|
..Default::default()
|
|
},
|
|
background_color: Color::WHITE.into(),
|
|
..Default::default()
|
|
},
|
|
Bar,
|
|
));
|
|
});
|
|
});
|
|
}
|
|
|
|
fn spawn_button_row(parent: &mut ChildBuilder, constraint: Constraint, text_style: TextStyle) {
|
|
let label = match constraint {
|
|
Constraint::FlexBasis => "flex_basis",
|
|
Constraint::Width => "size",
|
|
Constraint::MinWidth => "min_size",
|
|
Constraint::MaxWidth => "max_size",
|
|
};
|
|
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Column,
|
|
padding: UiRect::all(Val::Px(2.)),
|
|
align_items: AlignItems::Stretch,
|
|
..Default::default()
|
|
},
|
|
background_color: Color::BLACK.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
flex_direction: FlexDirection::Row,
|
|
justify_content: JustifyContent::End,
|
|
padding: UiRect::all(Val::Px(2.)),
|
|
..Default::default()
|
|
},
|
|
//background_color: Color::RED.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
// spawn row label
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
min_width: Val::Px(200.),
|
|
max_width: Val::Px(200.),
|
|
justify_content: JustifyContent::Center,
|
|
align_items: AlignItems::Center,
|
|
..Default::default()
|
|
},
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn(TextBundle {
|
|
text: Text::from_section(label.to_string(), text_style.clone()),
|
|
..Default::default()
|
|
});
|
|
});
|
|
|
|
// spawn row buttons
|
|
parent
|
|
.spawn(NodeBundle {
|
|
// background_color: Color::DARK_GREEN.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
spawn_button(
|
|
parent,
|
|
constraint,
|
|
ButtonValue(Val::Auto),
|
|
"Auto".to_string(),
|
|
text_style.clone(),
|
|
true,
|
|
);
|
|
for percent in [0., 25., 50., 75., 100., 125.] {
|
|
spawn_button(
|
|
parent,
|
|
constraint,
|
|
ButtonValue(Val::Percent(percent)),
|
|
format!("{percent}%"),
|
|
text_style.clone(),
|
|
false,
|
|
);
|
|
}
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
fn spawn_button(
|
|
parent: &mut ChildBuilder,
|
|
constraint: Constraint,
|
|
action: ButtonValue,
|
|
label: String,
|
|
text_style: TextStyle,
|
|
active: bool,
|
|
) {
|
|
parent
|
|
.spawn((
|
|
ButtonBundle {
|
|
style: Style {
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
border: UiRect::all(Val::Px(2.)),
|
|
margin: UiRect::horizontal(Val::Px(2.)),
|
|
..Default::default()
|
|
},
|
|
background_color: if active {
|
|
ACTIVE_BORDER_COLOR
|
|
} else {
|
|
INACTIVE_BORDER_COLOR
|
|
}
|
|
.into(),
|
|
..Default::default()
|
|
},
|
|
constraint,
|
|
action,
|
|
))
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Px(100.),
|
|
justify_content: JustifyContent::Center,
|
|
..Default::default()
|
|
},
|
|
background_color: if active {
|
|
ACTIVE_INNER_COLOR
|
|
} else {
|
|
INACTIVE_INNER_COLOR
|
|
}
|
|
.into(),
|
|
..Default::default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent.spawn(TextBundle {
|
|
text: Text::from_section(
|
|
label,
|
|
TextStyle {
|
|
color: if active {
|
|
ACTIVE_TEXT_COLOR
|
|
} else {
|
|
UNHOVERED_TEXT_COLOR
|
|
},
|
|
..text_style
|
|
},
|
|
)
|
|
.with_alignment(TextAlignment::Center),
|
|
..Default::default()
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
fn update_buttons(
|
|
mut button_query: Query<
|
|
(Entity, &Interaction, &Constraint, &ButtonValue),
|
|
Changed<Interaction>,
|
|
>,
|
|
mut bar_query: Query<&mut Style, With<Bar>>,
|
|
mut text_query: Query<&mut Text>,
|
|
children_query: Query<&Children>,
|
|
mut button_activated_event: EventWriter<ButtonActivatedEvent>,
|
|
) {
|
|
let mut style = bar_query.single_mut();
|
|
for (button_id, interaction, constraint, value) in button_query.iter_mut() {
|
|
match interaction {
|
|
Interaction::Clicked => {
|
|
button_activated_event.send(ButtonActivatedEvent(button_id));
|
|
match constraint {
|
|
Constraint::FlexBasis => {
|
|
style.flex_basis = value.0;
|
|
}
|
|
Constraint::Width => {
|
|
style.width = value.0;
|
|
}
|
|
Constraint::MinWidth => {
|
|
style.min_width = value.0;
|
|
}
|
|
Constraint::MaxWidth => {
|
|
style.max_width = value.0;
|
|
}
|
|
}
|
|
}
|
|
Interaction::Hovered => {
|
|
if let Ok(children) = children_query.get(button_id) {
|
|
for &child in children {
|
|
if let Ok(grand_children) = children_query.get(child) {
|
|
for &grandchild in grand_children {
|
|
if let Ok(mut text) = text_query.get_mut(grandchild) {
|
|
if text.sections[0].style.color != ACTIVE_TEXT_COLOR {
|
|
text.sections[0].style.color = HOVERED_TEXT_COLOR;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Interaction::None => {
|
|
if let Ok(children) = children_query.get(button_id) {
|
|
for &child in children {
|
|
if let Ok(grand_children) = children_query.get(child) {
|
|
for &grandchild in grand_children {
|
|
if let Ok(mut text) = text_query.get_mut(grandchild) {
|
|
if text.sections[0].style.color != ACTIVE_TEXT_COLOR {
|
|
text.sections[0].style.color = UNHOVERED_TEXT_COLOR;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn update_radio_buttons_colors(
|
|
mut event_reader: EventReader<ButtonActivatedEvent>,
|
|
button_query: Query<(Entity, &Constraint, &Interaction)>,
|
|
mut color_query: Query<&mut BackgroundColor>,
|
|
mut text_query: Query<&mut Text>,
|
|
children_query: Query<&Children>,
|
|
) {
|
|
for &ButtonActivatedEvent(button_id) in event_reader.iter() {
|
|
let target_constraint = button_query.get_component::<Constraint>(button_id).unwrap();
|
|
for (id, constraint, interaction) in button_query.iter() {
|
|
if target_constraint == constraint {
|
|
let (border_color, inner_color, text_color) = if id == button_id {
|
|
(ACTIVE_BORDER_COLOR, ACTIVE_INNER_COLOR, ACTIVE_TEXT_COLOR)
|
|
} else {
|
|
(
|
|
INACTIVE_BORDER_COLOR,
|
|
INACTIVE_INNER_COLOR,
|
|
if matches!(interaction, Interaction::Hovered) {
|
|
HOVERED_TEXT_COLOR
|
|
} else {
|
|
UNHOVERED_TEXT_COLOR
|
|
},
|
|
)
|
|
};
|
|
|
|
color_query.get_mut(id).unwrap().0 = border_color;
|
|
if let Ok(children) = children_query.get(id) {
|
|
for &child in children {
|
|
color_query.get_mut(child).unwrap().0 = inner_color;
|
|
if let Ok(grand_children) = children_query.get(child) {
|
|
for &grandchild in grand_children {
|
|
if let Ok(mut text) = text_query.get_mut(grandchild) {
|
|
text.sections[0].style.color = text_color;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|