mirror of
https://github.com/bevyengine/bevy
synced 2024-11-26 06:30:19 +00:00
c2c19e5ae4
**Ready for review. Examples migration progress: 100%.** # Objective - Implement https://github.com/bevyengine/bevy/discussions/15014 ## Solution This implements [cart's proposal](https://github.com/bevyengine/bevy/discussions/15014#discussioncomment-10574459) faithfully except for one change. I separated `TextSpan` from `TextSpan2d` because `TextSpan` needs to require the `GhostNode` component, which is a `bevy_ui` component only usable by UI. Extra changes: - Added `EntityCommands::commands_mut` that returns a mutable reference. This is a blocker for extension methods that return something other than `self`. Note that `sickle_ui`'s `UiBuilder::commands` returns a mutable reference for this reason. ## Testing - [x] Text examples all work. --- ## Showcase TODO: showcase-worthy ## Migration Guide TODO: very breaking ### Accessing text spans by index Text sections are now text sections on different entities in a hierarchy, Use the new `TextReader` and `TextWriter` system parameters to access spans by index. Before: ```rust fn refresh_text(mut query: Query<&mut Text, With<TimeText>>, time: Res<Time>) { let text = query.single_mut(); text.sections[1].value = format_time(time.elapsed()); } ``` After: ```rust fn refresh_text( query: Query<Entity, With<TimeText>>, mut writer: UiTextWriter, time: Res<Time> ) { let entity = query.single(); *writer.text(entity, 1) = format_time(time.elapsed()); } ``` ### Iterating text spans Text spans are now entities in a hierarchy, so the new `UiTextReader` and `UiTextWriter` system parameters provide ways to iterate that hierarchy. The `UiTextReader::iter` method will give you a normal iterator over spans, and `UiTextWriter::for_each` lets you visit each of the spans. --------- Co-authored-by: ickshonpe <david.curthoys@googlemail.com> Co-authored-by: Carter Anderson <mcanders1@gmail.com>
92 lines
3 KiB
Rust
92 lines
3 KiB
Rust
//! Showcases the [`RelativeCursorPosition`] component, used to check the position of the cursor relative to a UI node.
|
|
|
|
use bevy::{
|
|
prelude::*, render::camera::Viewport, ui::RelativeCursorPosition, winit::WinitSettings,
|
|
};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
|
|
.insert_resource(WinitSettings::desktop_app())
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, relative_cursor_position_system)
|
|
.run();
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
commands.spawn((
|
|
Camera2d,
|
|
Camera {
|
|
// Cursor position will take the viewport offset into account
|
|
viewport: Some(Viewport {
|
|
physical_position: [200, 100].into(),
|
|
physical_size: [600, 600].into(),
|
|
..default()
|
|
}),
|
|
..default()
|
|
},
|
|
));
|
|
|
|
commands
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Percent(100.),
|
|
height: Val::Percent(100.0),
|
|
align_items: AlignItems::Center,
|
|
justify_content: JustifyContent::Center,
|
|
flex_direction: FlexDirection::Column,
|
|
..default()
|
|
},
|
|
..default()
|
|
})
|
|
.with_children(|parent| {
|
|
parent
|
|
.spawn(NodeBundle {
|
|
style: Style {
|
|
width: Val::Px(250.),
|
|
height: Val::Px(250.),
|
|
margin: UiRect::bottom(Val::Px(15.)),
|
|
..default()
|
|
},
|
|
background_color: Color::srgb(235., 35., 12.).into(),
|
|
..default()
|
|
})
|
|
.insert(RelativeCursorPosition::default());
|
|
|
|
parent.spawn((
|
|
Text::new("(0.0, 0.0)"),
|
|
TextStyle {
|
|
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
|
|
font_size: 33.0,
|
|
color: Color::srgb(0.9, 0.9, 0.9),
|
|
..default()
|
|
},
|
|
));
|
|
});
|
|
}
|
|
|
|
/// This systems polls the relative cursor position and displays its value in a text component.
|
|
fn relative_cursor_position_system(
|
|
relative_cursor_position_query: Query<&RelativeCursorPosition>,
|
|
mut output_query: Query<(&mut Text, &mut TextStyle)>,
|
|
) {
|
|
let relative_cursor_position = relative_cursor_position_query.single();
|
|
|
|
let (mut output, mut style) = output_query.single_mut();
|
|
|
|
**output = if let Some(relative_cursor_position) = relative_cursor_position.normalized {
|
|
format!(
|
|
"({:.1}, {:.1})",
|
|
relative_cursor_position.x, relative_cursor_position.y
|
|
)
|
|
} else {
|
|
"unknown".to_string()
|
|
};
|
|
|
|
style.color = if relative_cursor_position.mouse_over() {
|
|
Color::srgb(0.1, 0.9, 0.1)
|
|
} else {
|
|
Color::srgb(0.9, 0.1, 0.1)
|
|
};
|
|
}
|