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.
82 lines
2.7 KiB
Rust
82 lines
2.7 KiB
Rust
//! Showcases the [`RelativeCursorPosition`] component, used to check the position of the cursor relative to a UI node.
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use bevy::{prelude::*, ui::RelativeCursorPosition, winit::WinitSettings};
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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(Update, relative_cursor_position_system)
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.run();
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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commands.spawn(Camera2dBundle::default());
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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.),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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flex_direction: FlexDirection::Column,
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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(NodeBundle {
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style: Style {
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width: Val::Px(250.),
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height: Val::Px(250.),
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margin: UiRect::bottom(Val::Px(15.)),
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..default()
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},
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background_color: Color::rgb(235., 35., 12.).into(),
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..default()
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})
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.insert(RelativeCursorPosition::default());
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parent.spawn(TextBundle {
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text: Text::from_section(
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"(0.0, 0.0)",
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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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),
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..default()
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});
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});
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}
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/// This systems polls the relative cursor position and displays its value in a text component.
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fn relative_cursor_position_system(
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relative_cursor_position_query: Query<&RelativeCursorPosition>,
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mut output_query: Query<&mut Text>,
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) {
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let relative_cursor_position = relative_cursor_position_query.single();
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let mut output = output_query.single_mut();
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output.sections[0].value =
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if let Some(relative_cursor_position) = relative_cursor_position.normalized {
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format!(
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"({:.1}, {:.1})",
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relative_cursor_position.x, relative_cursor_position.y
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)
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} else {
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"unknown".to_string()
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};
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output.sections[0].style.color = if relative_cursor_position.mouse_over() {
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Color::rgb(0.1, 0.9, 0.1)
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} else {
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Color::rgb(0.9, 0.1, 0.1)
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};
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}
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