mirror of
https://github.com/bevyengine/bevy
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b995827013
# Objective Make `bevy_ui` "root" nodes more intuitive to use/style by: - Removing the implicit flexbox styling (such as stretch alignment) that is applied to them, and replacing it with more intuitive CSS Grid styling (notably with stretch alignment disabled in both axes). - Making root nodes layout independently of each other. Instead of there being a single implicit "viewport" node that all root nodes are children of, there is now an implicit "viewport" node *per root node*. And layout of each tree is computed separately. ## Solution - Remove the global implicit viewport node, and instead create an implicit viewport node for each user-specified root node. - Keep track of both the user-specified root nodes and the implicit viewport nodes in a separate `Vec`. - Use the window's size as the `available_space` parameter to `Taffy.compute_layout` rather than setting it on the implicit viewport node (and set the viewport to `height: 100%; width: 100%` to make this "just work"). --- ## Changelog - Bevy UI now lays out root nodes independently of each other in separate layout contexts. - The implicit viewport node (which contains each user-specified root node) is now `Display::Grid` with `align_items` and `justify_items` both set to `Start`. ## Migration Guide - Bevy UI now lays out root nodes independently of each other in separate layout contexts. If you were relying on your root nodes being able to affect each other's layouts, then you may need to wrap them in a single root node. - The implicit viewport node (which contains each user-specified root node) is now `Display::Grid` with `align_items` and `justify_items` both set to `Start`. You may need to add `height: Val::Percent(100.)` to your root nodes if you were previously relying on being implicitly set.
402 lines
15 KiB
Rust
402 lines
15 KiB
Rust
//! Demonstrates how the to use the size constraints to control the size of a UI node.
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use bevy::prelude::*;
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_event::<ButtonActivatedEvent>()
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.add_systems(Startup, setup)
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.add_systems(Update, (update_buttons, update_radio_buttons_colors))
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.run();
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}
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const ACTIVE_BORDER_COLOR: Color = Color::ANTIQUE_WHITE;
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const INACTIVE_BORDER_COLOR: Color = Color::BLACK;
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const ACTIVE_INNER_COLOR: Color = Color::WHITE;
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const INACTIVE_INNER_COLOR: Color = Color::NAVY;
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const ACTIVE_TEXT_COLOR: Color = Color::BLACK;
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const HOVERED_TEXT_COLOR: Color = Color::WHITE;
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const UNHOVERED_TEXT_COLOR: Color = Color::GRAY;
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#[derive(Component)]
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struct Bar;
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#[derive(Copy, Clone, Debug, Component, PartialEq)]
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enum Constraint {
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FlexBasis,
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Width,
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MinWidth,
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MaxWidth,
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}
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#[derive(Copy, Clone, Component)]
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struct ButtonValue(Val);
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#[derive(Event)]
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struct ButtonActivatedEvent(Entity);
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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// ui camera
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commands.spawn(Camera2dBundle::default());
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let text_style = TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 40.0,
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color: Color::rgb(0.9, 0.9, 0.9),
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};
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commands
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.spawn(NodeBundle {
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style: Style {
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width: Val::Percent(100.0),
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height: Val::Percent(100.0),
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..Default::default()
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},
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background_color: Color::BLACK.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Column,
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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..Default::default()
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},
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn(
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TextBundle::from_section("Size Constraints Example", text_style.clone())
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.with_style(Style {
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margin: UiRect::bottom(Val::Px(25.)),
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..Default::default()
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}),
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);
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spawn_bar(parent);
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Column,
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align_items: AlignItems::Stretch,
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padding: UiRect::all(Val::Px(10.)),
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margin: UiRect::top(Val::Px(50.)),
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..Default::default()
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},
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background_color: Color::YELLOW.into(),
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..Default::default()
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})
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.with_children(|parent| {
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for constraint in [
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Constraint::MinWidth,
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Constraint::FlexBasis,
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Constraint::Width,
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Constraint::MaxWidth,
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] {
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spawn_button_row(parent, constraint, text_style.clone());
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}
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});
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});
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});
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}
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fn spawn_bar(parent: &mut ChildBuilder) {
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_basis: Val::Percent(100.0),
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align_self: AlignSelf::Stretch,
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padding: UiRect::all(Val::Px(10.)),
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..Default::default()
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},
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background_color: Color::YELLOW.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent
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.spawn(NodeBundle {
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style: Style {
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align_items: AlignItems::Stretch,
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width: Val::Percent(100.),
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height: Val::Px(100.),
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padding: UiRect::all(Val::Px(4.)),
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..Default::default()
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},
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background_color: Color::BLACK.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn((
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NodeBundle {
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style: Style {
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..Default::default()
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},
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background_color: Color::WHITE.into(),
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..Default::default()
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},
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Bar,
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));
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});
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});
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}
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fn spawn_button_row(parent: &mut ChildBuilder, constraint: Constraint, text_style: TextStyle) {
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let label = match constraint {
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Constraint::FlexBasis => "flex_basis",
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Constraint::Width => "size",
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Constraint::MinWidth => "min_size",
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Constraint::MaxWidth => "max_size",
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};
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Column,
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padding: UiRect::all(Val::Px(2.)),
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align_items: AlignItems::Stretch,
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..Default::default()
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},
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background_color: Color::BLACK.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Row,
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justify_content: JustifyContent::End,
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padding: UiRect::all(Val::Px(2.)),
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..Default::default()
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},
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//background_color: Color::RED.into(),
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..Default::default()
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})
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.with_children(|parent| {
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// spawn row label
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parent
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.spawn(NodeBundle {
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style: Style {
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min_width: Val::Px(200.),
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max_width: Val::Px(200.),
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..Default::default()
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},
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle {
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text: Text::from_section(label.to_string(), text_style.clone()),
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..Default::default()
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});
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});
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// spawn row buttons
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parent
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.spawn(NodeBundle {
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// background_color: Color::DARK_GREEN.into(),
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..Default::default()
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})
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.with_children(|parent| {
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spawn_button(
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parent,
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constraint,
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ButtonValue(Val::Auto),
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"Auto".to_string(),
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text_style.clone(),
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true,
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);
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for percent in [0., 25., 50., 75., 100., 125.] {
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spawn_button(
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parent,
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constraint,
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ButtonValue(Val::Percent(percent)),
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format!("{percent}%"),
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text_style.clone(),
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false,
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);
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}
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});
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});
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});
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}
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fn spawn_button(
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parent: &mut ChildBuilder,
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constraint: Constraint,
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action: ButtonValue,
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label: String,
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text_style: TextStyle,
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active: bool,
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) {
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parent
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.spawn((
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ButtonBundle {
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style: Style {
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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border: UiRect::all(Val::Px(2.)),
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margin: UiRect::horizontal(Val::Px(2.)),
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..Default::default()
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},
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background_color: if active {
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ACTIVE_BORDER_COLOR
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} else {
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INACTIVE_BORDER_COLOR
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}
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.into(),
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..Default::default()
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},
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constraint,
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action,
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))
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.with_children(|parent| {
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parent
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.spawn(NodeBundle {
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style: Style {
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width: Val::Px(100.),
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justify_content: JustifyContent::Center,
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..Default::default()
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},
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background_color: if active {
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ACTIVE_INNER_COLOR
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} else {
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INACTIVE_INNER_COLOR
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}
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.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle {
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text: Text::from_section(
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label,
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TextStyle {
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color: if active {
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ACTIVE_TEXT_COLOR
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} else {
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UNHOVERED_TEXT_COLOR
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},
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..text_style
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},
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)
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.with_alignment(TextAlignment::Center),
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..Default::default()
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});
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});
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});
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}
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fn update_buttons(
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mut button_query: Query<
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(Entity, &Interaction, &Constraint, &ButtonValue),
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Changed<Interaction>,
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>,
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mut bar_query: Query<&mut Style, With<Bar>>,
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mut text_query: Query<&mut Text>,
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children_query: Query<&Children>,
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mut button_activated_event: EventWriter<ButtonActivatedEvent>,
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) {
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let mut style = bar_query.single_mut();
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for (button_id, interaction, constraint, value) in button_query.iter_mut() {
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match interaction {
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Interaction::Pressed => {
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button_activated_event.send(ButtonActivatedEvent(button_id));
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match constraint {
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Constraint::FlexBasis => {
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style.flex_basis = value.0;
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}
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Constraint::Width => {
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style.width = value.0;
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}
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Constraint::MinWidth => {
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style.min_width = value.0;
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}
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Constraint::MaxWidth => {
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style.max_width = value.0;
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}
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}
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}
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Interaction::Hovered => {
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if let Ok(children) = children_query.get(button_id) {
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for &child in children {
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if let Ok(grand_children) = children_query.get(child) {
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for &grandchild in grand_children {
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if let Ok(mut text) = text_query.get_mut(grandchild) {
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if text.sections[0].style.color != ACTIVE_TEXT_COLOR {
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text.sections[0].style.color = HOVERED_TEXT_COLOR;
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}
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}
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}
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}
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}
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}
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}
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Interaction::None => {
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if let Ok(children) = children_query.get(button_id) {
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for &child in children {
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if let Ok(grand_children) = children_query.get(child) {
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for &grandchild in grand_children {
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if let Ok(mut text) = text_query.get_mut(grandchild) {
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if text.sections[0].style.color != ACTIVE_TEXT_COLOR {
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text.sections[0].style.color = UNHOVERED_TEXT_COLOR;
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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fn update_radio_buttons_colors(
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mut event_reader: EventReader<ButtonActivatedEvent>,
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button_query: Query<(Entity, &Constraint, &Interaction)>,
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mut color_query: Query<&mut BackgroundColor>,
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mut text_query: Query<&mut Text>,
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children_query: Query<&Children>,
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) {
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for &ButtonActivatedEvent(button_id) in event_reader.read() {
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let target_constraint = button_query.get_component::<Constraint>(button_id).unwrap();
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for (id, constraint, interaction) in button_query.iter() {
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if target_constraint == constraint {
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let (border_color, inner_color, text_color) = if id == button_id {
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(ACTIVE_BORDER_COLOR, ACTIVE_INNER_COLOR, ACTIVE_TEXT_COLOR)
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} else {
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(
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INACTIVE_BORDER_COLOR,
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INACTIVE_INNER_COLOR,
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if matches!(interaction, Interaction::Hovered) {
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HOVERED_TEXT_COLOR
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} else {
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UNHOVERED_TEXT_COLOR
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},
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)
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};
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color_query.get_mut(id).unwrap().0 = border_color;
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if let Ok(children) = children_query.get(id) {
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for &child in children {
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color_query.get_mut(child).unwrap().0 = inner_color;
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if let Ok(grand_children) = children_query.get(child) {
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for &grandchild in grand_children {
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if let Ok(mut text) = text_query.get_mut(grandchild) {
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text.sections[0].style.color = text_color;
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}
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}
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}
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}
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}
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}
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}
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}
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}
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