373f1eeb1e
# Objective Fix a few issues with some of the examples: * Root UI nodes have an implicit parent with `FlexDirection::Row` and `AlignItems::Stretch` set. Only a width constraint is needed to fill the viewport. Specifying ```height: Val::Percent(100.)``` is unnecessary and can cause confusing overflow behaviour. * The default for position and size constraint properties is `Val::Auto`. Setting `left: Val::Auto`, `max_height: Val::Auto`, etc does nothing. ## Solution Delete those lines. There should be no observable differences in the behaviours of any of the examples. Also changed a padding setting in the `flex_layout` example to use the `axes` helper function.
495 lines
21 KiB
Rust
495 lines
21 KiB
Rust
//! Demonstrates how Display and Visibility work in the UI.
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use bevy::prelude::*;
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use bevy::winit::WinitSettings;
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const PALETTE: [&str; 4] = ["27496D", "466B7A", "669DB3", "ADCBE3"];
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const HIDDEN_COLOR: Color = Color::rgb(1.0, 0.7, 0.7);
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
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.insert_resource(WinitSettings::desktop_app())
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.add_systems(Startup, setup)
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.add_systems(
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Update,
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(
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buttons_handler::<Display>,
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buttons_handler::<Visibility>,
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text_hover,
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),
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)
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.run();
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}
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#[derive(Component)]
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struct Target<T> {
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id: Entity,
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phantom: std::marker::PhantomData<T>,
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}
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impl<T> Target<T> {
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fn new(id: Entity) -> Self {
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Self {
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id,
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phantom: std::marker::PhantomData,
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}
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}
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}
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trait TargetUpdate {
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type TargetComponent: Component;
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const NAME: &'static str;
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fn update_target(&self, target: &mut Self::TargetComponent) -> String;
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}
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impl TargetUpdate for Target<Display> {
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type TargetComponent = Style;
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const NAME: &'static str = "Display";
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fn update_target(&self, style: &mut Self::TargetComponent) -> String {
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style.display = match style.display {
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Display::Flex => Display::None,
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Display::None => Display::Flex,
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Display::Grid => unreachable!(),
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};
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format!("{}::{:?} ", Self::NAME, style.display)
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}
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}
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impl TargetUpdate for Target<Visibility> {
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type TargetComponent = Visibility;
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const NAME: &'static str = "Visibility";
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fn update_target(&self, visibility: &mut Self::TargetComponent) -> String {
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*visibility = match *visibility {
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Visibility::Inherited => Visibility::Visible,
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Visibility::Visible => Visibility::Hidden,
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Visibility::Hidden => Visibility::Inherited,
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};
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format!("{}::{visibility:?}", Self::NAME)
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}
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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let palette = PALETTE.map(|hex| Color::hex(hex).unwrap());
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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: 24.0,
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color: Color::WHITE,
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};
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commands.spawn(Camera2dBundle::default());
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commands.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Column,
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flex_basis: Val::Percent(100.),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::SpaceEvenly,
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..Default::default()
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},
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background_color: BackgroundColor(Color::BLACK),
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..Default::default()
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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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"Use the panel on the right to change the Display and Visibility properties for the respective nodes of the panel on the left",
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text_style.clone(),
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).with_alignment(TextAlignment::Center),
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style: Style {
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margin: UiRect::bottom(Val::Px(10.)),
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..Default::default()
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},
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..Default::default()
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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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width: Val::Percent(100.),
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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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let mut target_ids = vec![];
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parent.spawn(NodeBundle {
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style: Style {
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width: Val::Percent(50.),
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height: Val::Px(520.),
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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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}).with_children(|parent| {
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target_ids = spawn_left_panel(parent, &palette);
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});
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parent.spawn(NodeBundle {
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style: Style {
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width: Val::Percent(50.),
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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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}).with_children(|parent| {
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spawn_right_panel(parent, text_style, &palette, target_ids);
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});
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});
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parent.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Row,
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align_items: AlignItems::Start,
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justify_content: JustifyContent::Start,
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column_gap: Val::Px(10.),
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..Default::default()
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},
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..default() })
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.with_children(|builder| {
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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: 20.0,
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color: Color::WHITE,
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};
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builder.spawn(TextBundle {
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text: Text::from_section(
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"Display::None\nVisibility::Hidden\nVisbility::Inherited",
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TextStyle { color: HIDDEN_COLOR, ..text_style.clone() }
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).with_alignment(TextAlignment::Center),
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..Default::default()
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});
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builder.spawn(TextBundle {
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text: Text::from_section(
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"-\n-\n-",
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TextStyle { color: Color::DARK_GRAY, ..text_style.clone() }
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).with_alignment(TextAlignment::Center),
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..Default::default()
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});
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builder.spawn(TextBundle::from_section(
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"The UI Node and its descendants will not be visible and will not be allotted any space in the UI layout.\nThe UI Node will not be visible but will still occupy space in the UI layout.\nThe UI node will inherit the visibility property of its parent. If it has no parent it will be visible.",
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text_style
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));
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});
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});
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}
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fn spawn_left_panel(builder: &mut ChildBuilder, palette: &[Color; 4]) -> Vec<Entity> {
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let mut target_ids = vec![];
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builder
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.spawn(NodeBundle {
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style: Style {
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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: BackgroundColor(Color::WHITE),
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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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..Default::default()
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},
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background_color: BackgroundColor(Color::BLACK),
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..Default::default()
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})
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.with_children(|parent| {
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let id = parent
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.spawn((NodeBundle {
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style: Style {
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align_items: AlignItems::FlexEnd,
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justify_content: JustifyContent::FlexEnd,
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..Default::default()
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},
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background_color: BackgroundColor(palette[0]),
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..Default::default()
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},))
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.with_children(|parent| {
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parent.spawn(NodeBundle {
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style: Style {
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width: Val::Px(100.),
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height: Val::Px(500.),
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..Default::default()
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},
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..Default::default()
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});
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let id = parent
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.spawn((NodeBundle {
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style: Style {
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height: Val::Px(400.),
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align_items: AlignItems::FlexEnd,
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justify_content: JustifyContent::FlexEnd,
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..Default::default()
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},
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background_color: BackgroundColor(palette[1]),
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..Default::default()
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},))
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.with_children(|parent| {
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parent.spawn(NodeBundle {
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style: Style {
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width: Val::Px(100.),
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height: Val::Px(400.),
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..Default::default()
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},
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..Default::default()
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});
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let id = parent
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.spawn((NodeBundle {
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style: Style {
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height: Val::Px(300.),
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align_items: AlignItems::FlexEnd,
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justify_content: JustifyContent::FlexEnd,
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..Default::default()
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},
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background_color: BackgroundColor(palette[2]),
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..Default::default()
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},))
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.with_children(|parent| {
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parent.spawn(NodeBundle {
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style: Style {
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width: Val::Px(100.),
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height: Val::Px(300.),
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..Default::default()
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},
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..Default::default()
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});
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let id = parent
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.spawn((NodeBundle {
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style: Style {
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width: Val::Px(200.),
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height: Val::Px(200.),
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..Default::default()
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},
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background_color: BackgroundColor(palette[3]),
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..Default::default()
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},))
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.id();
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target_ids.push(id);
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})
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.id();
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target_ids.push(id);
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})
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.id();
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target_ids.push(id);
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})
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.id();
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target_ids.push(id);
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});
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});
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target_ids
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}
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fn spawn_right_panel(
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parent: &mut ChildBuilder,
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text_style: TextStyle,
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palette: &[Color; 4],
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mut target_ids: Vec<Entity>,
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) {
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let spawn_buttons = |parent: &mut ChildBuilder, target_id| {
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spawn_button::<Display>(parent, text_style.clone(), target_id);
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spawn_button::<Visibility>(parent, text_style.clone(), target_id);
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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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padding: UiRect::all(Val::Px(10.)),
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..Default::default()
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},
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background_color: BackgroundColor(Color::WHITE),
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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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width: Val::Px(500.),
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height: Val::Px(500.),
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flex_direction: FlexDirection::Column,
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align_items: AlignItems::FlexEnd,
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justify_content: JustifyContent::SpaceBetween,
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padding: UiRect {
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left: Val::Px(5.),
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top: Val::Px(5.),
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..Default::default()
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},
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..Default::default()
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},
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background_color: BackgroundColor(palette[0]),
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..Default::default()
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})
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.with_children(|parent| {
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spawn_buttons(parent, target_ids.pop().unwrap());
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parent
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.spawn((NodeBundle {
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style: Style {
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width: Val::Px(400.),
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height: Val::Px(400.),
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flex_direction: FlexDirection::Column,
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align_items: AlignItems::FlexEnd,
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justify_content: JustifyContent::SpaceBetween,
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padding: UiRect {
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left: Val::Px(5.),
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top: Val::Px(5.),
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..Default::default()
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},
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..Default::default()
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},
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background_color: BackgroundColor(palette[1]),
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..Default::default()
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},))
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.with_children(|parent| {
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spawn_buttons(parent, target_ids.pop().unwrap());
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parent
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.spawn((NodeBundle {
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style: Style {
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width: Val::Px(300.),
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height: Val::Px(300.),
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flex_direction: FlexDirection::Column,
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align_items: AlignItems::FlexEnd,
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justify_content: JustifyContent::SpaceBetween,
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padding: UiRect {
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left: Val::Px(5.),
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top: Val::Px(5.),
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..Default::default()
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},
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..Default::default()
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},
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background_color: BackgroundColor(palette[2]),
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..Default::default()
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},))
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.with_children(|parent| {
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spawn_buttons(parent, target_ids.pop().unwrap());
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parent
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.spawn((NodeBundle {
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style: Style {
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width: Val::Px(200.),
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height: Val::Px(200.),
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align_items: AlignItems::FlexStart,
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justify_content: JustifyContent::SpaceBetween,
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flex_direction: FlexDirection::Column,
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padding: UiRect {
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left: Val::Px(5.),
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top: Val::Px(5.),
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..Default::default()
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},
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..Default::default()
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},
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background_color: BackgroundColor(palette[3]),
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..Default::default()
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},))
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.with_children(|parent| {
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spawn_buttons(parent, target_ids.pop().unwrap());
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parent.spawn(NodeBundle {
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style: Style {
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width: Val::Px(100.),
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height: Val::Px(100.),
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..Default::default()
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},
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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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});
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});
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}
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fn spawn_button<T>(parent: &mut ChildBuilder, text_style: TextStyle, target: Entity)
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where
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T: Default + std::fmt::Debug + Send + Sync + 'static,
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Target<T>: TargetUpdate,
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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_self: AlignSelf::FlexStart,
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padding: UiRect::axes(Val::Px(5.), Val::Px(1.)),
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..Default::default()
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},
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background_color: BackgroundColor(Color::BLACK.with_a(0.5)),
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..Default::default()
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},
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Target::<T>::new(target),
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))
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.with_children(|builder| {
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builder.spawn(
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TextBundle::from_section(
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format!("{}::{:?}", Target::<T>::NAME, T::default()),
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text_style,
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)
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.with_text_alignment(TextAlignment::Center),
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);
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});
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}
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fn buttons_handler<T>(
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mut left_panel_query: Query<&mut <Target<T> as TargetUpdate>::TargetComponent>,
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mut visibility_button_query: Query<(&Target<T>, &Interaction, &Children), Changed<Interaction>>,
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mut text_query: Query<&mut Text>,
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) where
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T: Send + Sync,
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Target<T>: TargetUpdate + Component,
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{
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for (target, interaction, children) in visibility_button_query.iter_mut() {
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if matches!(interaction, Interaction::Pressed) {
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let mut target_value = left_panel_query.get_mut(target.id).unwrap();
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for &child in children {
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if let Ok(mut text) = text_query.get_mut(child) {
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text.sections[0].value = target.update_target(target_value.as_mut());
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text.sections[0].style.color = if text.sections[0].value.contains("None")
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|| text.sections[0].value.contains("Hidden")
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{
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Color::rgb(1.0, 0.7, 0.7)
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} else {
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Color::WHITE
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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 text_hover(
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mut button_query: Query<(&Interaction, &mut BackgroundColor, &Children), Changed<Interaction>>,
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mut text_query: Query<&mut Text>,
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) {
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for (interaction, mut background_color, children) in button_query.iter_mut() {
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match interaction {
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Interaction::Hovered => {
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*background_color = BackgroundColor(Color::BLACK.with_a(0.6));
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for &child in children {
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if let Ok(mut text) = text_query.get_mut(child) {
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// Bypass change detection to avoid recomputation of the text when only changing the color
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text.bypass_change_detection().sections[0].style.color = Color::YELLOW;
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}
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}
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}
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_ => {
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*background_color = BackgroundColor(Color::BLACK.with_a(0.5));
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for &child in children {
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if let Ok(mut text) = text_query.get_mut(child) {
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text.bypass_change_detection().sections[0].style.color =
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if text.sections[0].value.contains("None")
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|| text.sections[0].value.contains("Hidden")
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{
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HIDDEN_COLOR
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} else {
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Color::WHITE
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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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