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https://github.com/bevyengine/bevy
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# Objective Fixes https://github.com/bevyengine/bevy/issues/11157. ## Solution Stop using `BackgroundColor` as a color tint for `UiImage`. Add a `UiImage::color` field for color tint instead. Allow a UI node to simultaneously include a solid-color background and an image, with the image rendered on top of the background (this is already how it works for e.g. text).  --- ## Changelog - The `BackgroundColor` component now renders a solid-color background behind `UiImage` instead of tinting its color. - Removed `BackgroundColor` from `ImageBundle`, `AtlasImageBundle`, and `ButtonBundle`. - Added `UiImage::color`. - Expanded `RenderUiSystem` variants. - Renamed `bevy_ui::extract_text_uinodes` to `extract_uinodes_text` for consistency. ## Migration Guide - `BackgroundColor` no longer tints the color of UI images. Use `UiImage::color` for that instead. - For solid color buttons, replace `ButtonBundle { background_color: my_color.into(), ... }` with `ButtonBundle { image: UiImage::default().with_color(my_color), ... }`, and update button interaction systems to use `UiImage::color` instead of `BackgroundColor` as well. - `bevy_ui::RenderUiSystem::ExtractNode` has been split into `ExtractBackgrounds`, `ExtractImages`, `ExtractBorders`, and `ExtractText`. - `bevy_ui::extract_uinodes` has been split into `bevy_ui::extract_uinode_background_colors` and `bevy_ui::extract_uinode_images`. - `bevy_ui::extract_text_uinodes` has been renamed to `extract_uinode_text`.
81 lines
2.9 KiB
Rust
81 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(Camera2dBundle::default());
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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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image: UiImage::default().with_color(Color::srgb(0.1, 0.5, 0.1)),
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..default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle::from_section(
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"Button 1",
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TextStyle {
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font: font_handle.clone(),
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font_size: 40.0,
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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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},
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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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image: UiImage::default().with_color(Color::srgb(0.5, 0.1, 0.5)),
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..default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle::from_section(
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"Button 2",
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TextStyle {
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font: font_handle.clone(),
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font_size: 40.0,
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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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},
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));
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});
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});
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}
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