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>
84 lines
2.9 KiB
Rust
84 lines
2.9 KiB
Rust
//! Demonstrates how to use transparency with UI.
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//! Shows two colored buttons with transparent text.
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use bevy::prelude::*;
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fn main() {
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App::new()
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.insert_resource(ClearColor(Color::BLACK))
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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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(Camera2d);
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let font_handle = asset_server.load("fonts/FiraSans-Bold.ttf");
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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::SpaceAround,
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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(ButtonBundle {
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style: Style {
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width: Val::Px(150.0),
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height: Val::Px(65.0),
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..default()
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},
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background_color: Color::srgb(0.1, 0.5, 0.1).into(),
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..default()
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})
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.with_children(|parent| {
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parent.spawn((
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Text::new("Button 1"),
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TextStyle {
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font: font_handle.clone(),
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font_size: 33.0,
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// Alpha channel of the color controls transparency.
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color: Color::srgba(1.0, 1.0, 1.0, 0.2),
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..default()
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},
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));
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});
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// Button with a different color,
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// to demonstrate the text looks different due to its transparency.
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parent
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.spawn(ButtonBundle {
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style: Style {
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width: Val::Px(150.0),
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height: Val::Px(65.0),
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..default()
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},
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background_color: Color::srgb(0.5, 0.1, 0.5).into(),
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..default()
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})
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.with_children(|parent| {
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parent.spawn((
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Text::new("Button 2"),
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TextStyle {
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font: font_handle.clone(),
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font_size: 33.0,
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// Alpha channel of the color controls transparency.
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color: Color::srgba(1.0, 1.0, 1.0, 0.2),
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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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