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Size Constraints Example (#7956)

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# Objective

Add a simple example demonstrating how to use size constraints.

Related to #7946

# Solution

<img width="827" alt="Capture"
src="https://user-images.githubusercontent.com/27962798/223741566-4b8eca99-c450-42b5-a40e-a414858c8310.PNG">

# Changelog
* Added the example `size_constraints`
This commit is contained in:
ickshonpe 2023-04-24 15:28:00 +01:00 committed by GitHub
parent 9a3225d3a8
commit f3360938eb
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10
Cargo.toml
View file

@ -1802,6 +1802,16 @@ description = "Showcases the RelativeCursorPosition component"
category = "UI (User Interface)"
wasm = true
[[example]]
name = "size_constraints"
path = "examples/ui/size_constraints.rs"
[package.metadata.example.size_constraints]
name = "Size Constraints"
description = "Demonstrates how the to use the size constraints to control the size of a UI node."
category = "UI (User Interface)"
wasm = true
[[example]]
name = "text"
path = "examples/ui/text.rs"

1
examples/README.md
View file

@ -338,6 +338,7 @@ Example | Description
[Overflow](../examples/ui/overflow.rs) | Simple example demonstrating overflow behavior
[Overflow and Clipping Debug](../examples/ui/overflow_debug.rs) | An example to debug overflow and clipping behavior
[Relative Cursor Position](../examples/ui/relative_cursor_position.rs) | Showcases the RelativeCursorPosition component
[Size Constraints](../examples/ui/size_constraints.rs) | Demonstrates how the to use the size constraints to control the size of a UI node.
[Text](../examples/ui/text.rs) | Illustrates creating and updating text
[Text Debug](../examples/ui/text_debug.rs) | An example for debugging text layout
[Text Wrap Debug](../examples/ui/text_wrap_debug.rs) | Demonstrates text wrapping

399
examples/ui/size_constraints.rs Normal file
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@ -0,0 +1,399 @@
//! 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);
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,
size: Size::new(Val::Percent(100.), 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_size: Size::width(Val::Px(200.)),
max_size: Size::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 {
size: Size::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.size.width = value.0;
}
Constraint::MinWidth => {
style.min_size.width = value.0;
}
Constraint::MaxWidth => {
style.max_size.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;
}
}
}
}
}
}
}
}
}