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>
118 lines
4.2 KiB
Rust
118 lines
4.2 KiB
Rust
//! This example illustrates how to create buttons with their texture atlases sliced
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//! and kept in proportion instead of being stretched by the button dimensions
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use bevy::{
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color::palettes::css::{GOLD, ORANGE},
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prelude::*,
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winit::WinitSettings,
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};
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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, button_system)
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.run();
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}
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fn button_system(
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mut interaction_query: Query<
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(&Interaction, &mut TextureAtlas, &Children, &mut UiImage),
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(Changed<Interaction>, With<Button>),
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>,
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mut text_query: Query<&mut Text>,
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) {
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for (interaction, mut atlas, children, mut image) in &mut interaction_query {
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let mut text = text_query.get_mut(children[0]).unwrap();
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match *interaction {
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Interaction::Pressed => {
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**text = "Press".to_string();
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atlas.index = (atlas.index + 1) % 30;
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image.color = GOLD.into();
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}
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Interaction::Hovered => {
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**text = "Hover".to_string();
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image.color = ORANGE.into();
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}
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Interaction::None => {
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**text = "Button".to_string();
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image.color = Color::WHITE;
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}
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}
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}
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}
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fn setup(
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mut commands: Commands,
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asset_server: Res<AssetServer>,
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mut texture_atlases: ResMut<Assets<TextureAtlasLayout>>,
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) {
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let texture_handle = asset_server.load("textures/fantasy_ui_borders/border_sheet.png");
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let atlas_layout =
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TextureAtlasLayout::from_grid(UVec2::new(50, 50), 6, 6, Some(UVec2::splat(2)), None);
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let atlas_layout_handle = texture_atlases.add(atlas_layout);
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let slicer = TextureSlicer {
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border: BorderRect::square(24.0),
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center_scale_mode: SliceScaleMode::Stretch,
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sides_scale_mode: SliceScaleMode::Stretch,
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max_corner_scale: 1.0,
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};
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// ui camera
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commands.spawn(Camera2d);
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commands
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.spawn(NodeBundle {
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style: Style {
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width: Val::Percent(100.0),
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height: Val::Percent(100.0),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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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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for (idx, [w, h]) in [
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(0, [150.0, 150.0]),
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(7, [300.0, 150.0]),
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(13, [150.0, 300.0]),
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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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width: Val::Px(w),
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height: Val::Px(h),
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// horizontally center child text
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justify_content: JustifyContent::Center,
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// vertically center child text
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align_items: AlignItems::Center,
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margin: UiRect::all(Val::Px(20.0)),
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..default()
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},
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image: texture_handle.clone().into(),
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..default()
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},
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ImageScaleMode::Sliced(slicer.clone()),
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TextureAtlas {
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index: idx,
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layout: atlas_layout_handle.clone(),
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},
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))
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.with_children(|parent| {
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parent.spawn((
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Text::new("Button"),
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TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 33.0,
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color: Color::srgb(0.9, 0.9, 0.9),
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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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