Modified the "scroll.rs" example to use the new spawning API. (#19592)
# Objective - Update the scroll example to use the latest API. ## Solution - It now uses the 'children![]' API. ## Testing - I manually verified that the scrolling was working ## Limitations - Unfortunately, I couldn't find a way to spawn observers targeting the entity inside the "fn() -> impl Bundle" function.
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LP
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@ -3,6 +3,7 @@
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use accesskit::{Node as Accessible, Role};
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use bevy::{
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a11y::AccessibilityNode,
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ecs::spawn::SpawnIter,
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input::mouse::{MouseScrollUnit, MouseWheel},
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picking::hover::HoverMap,
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prelude::*,
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@ -26,6 +27,9 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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// Camera
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commands.spawn((Camera2d, IsDefaultUiCamera));
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// Font
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let font_handle = asset_server.load("fonts/FiraSans-Bold.ttf");
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// root node
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commands
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.spawn(Node {
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@ -49,7 +53,7 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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parent.spawn((
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Text::new("Horizontally Scrolling list (Ctrl + MouseWheel)"),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font: font_handle.clone(),
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font_size: FONT_SIZE,
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..default()
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},
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@ -72,8 +76,7 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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for i in 0..100 {
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parent.spawn((Text(format!("Item {i}")),
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TextFont {
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font: asset_server
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.load("fonts/FiraSans-Bold.ttf"),
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font: font_handle.clone(),
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..default()
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},
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Label,
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@ -101,38 +104,45 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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});
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// container for all other examples
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parent
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.spawn(Node {
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parent.spawn((
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Node {
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width: Val::Percent(100.),
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height: Val::Percent(100.),
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flex_direction: FlexDirection::Row,
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justify_content: JustifyContent::SpaceBetween,
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..default()
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})
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.with_children(|parent| {
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// vertical scroll example
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parent
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.spawn(Node {
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},
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children![
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vertically_scrolling_list(asset_server.load("fonts/FiraSans-Bold.ttf")),
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bidirectional_scrolling_list(asset_server.load("fonts/FiraSans-Bold.ttf")),
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nested_scrolling_list(asset_server.load("fonts/FiraSans-Bold.ttf")),
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],
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));
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});
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}
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fn vertically_scrolling_list(font_handle: Handle<Font>) -> impl Bundle {
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(
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Node {
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flex_direction: FlexDirection::Column,
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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width: Val::Px(200.),
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..default()
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})
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.with_children(|parent| {
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},
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children![
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(
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// Title
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parent.spawn((
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Text::new("Vertically Scrolling List"),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font: font_handle.clone(),
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font_size: FONT_SIZE,
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..default()
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},
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Label,
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));
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),
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(
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// Scrolling list
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parent
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.spawn((
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Node {
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flex_direction: FlexDirection::Column,
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align_self: AlignSelf::Stretch,
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@ -141,66 +151,57 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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..default()
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},
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BackgroundColor(Color::srgb(0.10, 0.10, 0.10)),
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))
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.with_children(|parent| {
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// List items
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for i in 0..25 {
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parent
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.spawn(Node {
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Children::spawn(SpawnIter((0..25).map(move |i| {
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(
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Node {
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min_height: Val::Px(LINE_HEIGHT),
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max_height: Val::Px(LINE_HEIGHT),
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..default()
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})
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.insert(Pickable {
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},
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Pickable {
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should_block_lower: false,
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..default()
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})
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.with_children(|parent| {
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parent
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.spawn((
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},
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children![(
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Text(format!("Item {i}")),
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TextFont {
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font: asset_server
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.load("fonts/FiraSans-Bold.ttf"),
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font: font_handle.clone(),
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..default()
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},
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Label,
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AccessibilityNode(Accessible::new(
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Role::ListItem,
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)),
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))
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.insert(Pickable {
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AccessibilityNode(Accessible::new(Role::ListItem)),
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Pickable {
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should_block_lower: false,
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..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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})))
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),
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],
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)
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}
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// Bidirectional scroll example
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parent
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.spawn(Node {
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fn bidirectional_scrolling_list(font_handle: Handle<Font>) -> impl Bundle {
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(
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Node {
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flex_direction: FlexDirection::Column,
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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width: Val::Px(200.),
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..default()
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})
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.with_children(|parent| {
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// Title
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parent.spawn((
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},
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children![
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(
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Text::new("Bidirectionally Scrolling List"),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font: font_handle.clone(),
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font_size: FONT_SIZE,
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..default()
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},
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Label,
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));
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// Scrolling list
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parent
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.spawn((
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),
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(
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Node {
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flex_direction: FlexDirection::Column,
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align_self: AlignSelf::Stretch,
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@ -209,66 +210,60 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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..default()
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},
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BackgroundColor(Color::srgb(0.10, 0.10, 0.10)),
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))
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.with_children(|parent| {
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// Rows in each column
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for oi in 0..10 {
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parent
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.spawn(Node {
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Children::spawn(SpawnIter((0..25).map(move |oi| {
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(
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Node {
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flex_direction: FlexDirection::Row,
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..default()
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})
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.insert(Pickable::IGNORE)
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.with_children(|parent| {
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// Elements in each row
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for i in 0..25 {
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parent
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.spawn((
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Text(format!("Item {}", (oi * 25) + i)),
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},
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Pickable::IGNORE,
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Children::spawn(SpawnIter((0..10).map({
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let value = font_handle.clone();
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move |i| {
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(
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Text(format!("Item {}", (oi * 10) + i)),
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TextFont {
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font: asset_server.load(
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"fonts/FiraSans-Bold.ttf",
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),
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font: value.clone(),
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..default()
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},
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Label,
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AccessibilityNode(Accessible::new(
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Role::ListItem,
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)),
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))
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.insert(Pickable {
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AccessibilityNode(Accessible::new(Role::ListItem)),
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Pickable {
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should_block_lower: false,
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..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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})))
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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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// Nested scrolls example
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parent
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.spawn(Node {
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fn nested_scrolling_list(font_handle: Handle<Font>) -> impl Bundle {
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(
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Node {
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flex_direction: FlexDirection::Column,
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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width: Val::Px(200.),
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..default()
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})
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.with_children(|parent| {
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},
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children![
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(
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// Title
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parent.spawn((
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Text::new("Nested Scrolling Lists"),
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TextFont {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font: font_handle.clone(),
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font_size: FONT_SIZE,
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..default()
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},
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Label,
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));
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),
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(
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// Outer, horizontal scrolling container
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parent
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.spawn((
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Node {
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column_gap: Val::Px(20.),
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flex_direction: FlexDirection::Row,
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@ -278,12 +273,9 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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..default()
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},
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BackgroundColor(Color::srgb(0.10, 0.10, 0.10)),
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))
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.with_children(|parent| {
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// Inner, scrolling columns
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for oi in 0..30 {
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parent
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.spawn((
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Children::spawn(SpawnIter((0..30).map(move |oi| {
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(
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Node {
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flex_direction: FlexDirection::Column,
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align_self: AlignSelf::Stretch,
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@ -291,38 +283,33 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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..default()
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},
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BackgroundColor(Color::srgb(0.05, 0.05, 0.05)),
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))
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.insert(Pickable {
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Pickable {
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should_block_lower: false,
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..default()
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})
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.with_children(|parent| {
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for i in 0..25 {
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parent
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.spawn((
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},
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Children::spawn(SpawnIter((0..30).map({
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let value = font_handle.clone();
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move |i| {
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(
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Text(format!("Item {}", (oi * 25) + i)),
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TextFont {
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font: asset_server.load(
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"fonts/FiraSans-Bold.ttf",
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),
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font: value.clone(),
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..default()
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},
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Label,
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AccessibilityNode(Accessible::new(
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Role::ListItem,
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)),
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))
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.insert(Pickable {
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AccessibilityNode(Accessible::new(Role::ListItem)),
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Pickable {
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should_block_lower: false,
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..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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});
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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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/// Updates the scroll position of scrollable nodes in response to mouse input
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