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100 lines
3.3 KiB
Rust
100 lines
3.3 KiB
Rust
use bevy::{input::mouse::MouseWheel, prelude::*};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins.set(WindowPlugin {
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primary_window: Some(Window {
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title: "UI WTF".into(),
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resolution: (640., 480.).into(),
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..default()
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}),
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..default()
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}))
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// Only run when window is active to reduce cpu cycles
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// .insert_resource(WinitSettings::desktop_app())
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.add_startup_system(init)
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.add_system(scroll)
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.run();
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}
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#[derive(Component)]
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struct ScrollingList;
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fn init(mut commands: Commands) {
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info!("Spawning camera");
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commands.spawn(Camera2dBundle { ..default() });
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info!("Initializing UI");
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commands
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.spawn(NodeBundle {
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background_color: BackgroundColor(Color::WHITE),
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style: Style {
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justify_content: JustifyContent::Center,
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size: Size::all(Val::Percent(90.0)),
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overflow: Overflow::Hidden,
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..default()
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},
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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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NodeBundle {
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background_color: BackgroundColor(Color::OLIVE),
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style: Style {
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flex_wrap: FlexWrap::Wrap,
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flex_direction: FlexDirection::Row,
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justify_content: JustifyContent::SpaceAround,
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size: Size::AUTO,
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max_size: Size::UNDEFINED,
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..default()
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},
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..default()
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},
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ScrollingList,
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))
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.with_children(|parent| {
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info!("Initializing Child Element");
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let colors = [
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Color::ORANGE,
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Color::BLUE,
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Color::GREEN,
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Color::SALMON,
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Color::SEA_GREEN,
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Color::MAROON,
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Color::ORANGE,
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Color::BLUE,
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Color::GREEN,
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Color::SALMON,
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Color::SEA_GREEN,
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Color::MAROON,
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];
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for i in 0..12 {
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parent.spawn(NodeBundle {
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background_color: BackgroundColor(colors[i]),
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style: Style {
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size: Size::all(Val::Px(256.0)),
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padding: UiRect::all(Val::Px(5.0)),
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..default()
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},
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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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fn scroll(
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mut scroll_evr: EventReader<MouseWheel>,
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mut query: Query<&mut Style, With<ScrollingList>>,
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) {
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for ev in scroll_evr.iter() {
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for mut s in query.iter_mut() {
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s.position.top = match s.position.top {
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Val::Px(current) => Val::Px(current + (ev.y * 5.0)),
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_ => Val::Px(0.0),
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};
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}
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}
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}
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