mirror of
https://github.com/bevyengine/bevy
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336fddb101
# Objective In Bevy 0.13, `BackgroundColor` simply tinted the image of any `UiImage`. This was confusing: in every other case (e.g. Text), this added a solid square behind the element. #11165 changed this, but removed `BackgroundColor` from `ImageBundle` to avoid confusion, since the semantic meaning had changed. However, this resulted in a serious UX downgrade / inconsistency, as this behavior was no longer part of the bundle (unlike for `TextBundle` or `NodeBundle`), leaving users with a relatively frustrating upgrade path. Additionally, adding both `BackgroundColor` and `UiImage` resulted in a bizarre effect, where the background color was seemingly ignored as it was covered by a solid white placeholder image. Fixes #13969. ## Solution Per @viridia's design: > - if you don't specify a background color, it's transparent. > - if you don't specify an image color, it's white (because it's a multiplier). > - if you don't specify an image, no image is drawn. > - if you specify both a background color and an image color, they are independent. > - the background color is drawn behind the image (in whatever pixels are transparent) As laid out by @benfrankel, this involves: 1. Changing the default `UiImage` to use a transparent texture but a pure white tint. 2. Adding `UiImage::solid_color` to quickly set placeholder images. 3. Changing the default `BorderColor` and `BackgroundColor` to transparent. 4. Removing the default overrides for these values in the other assorted UI bundles. 5. Adding `BackgroundColor` back to `ImageBundle` and `ButtonBundle`. 6. Adding a 1x1 `Image::transparent`, which can be accessed from `Assets<Image>` via the `TRANSPARENT_IMAGE_HANDLE` constant. Huge thanks to everyone who helped out with the design in the linked issue and [the Discord thread](https://discord.com/channels/691052431525675048/1255209923890118697/1255209999278280844): this was very much a joint design. @cart helped me figure out how to set the UiImage's default texture to a transparent 1x1 image, which is a much nicer fix. ## Testing I've checked the examples modified by this PR, and the `ui` example as well just to be sure. ## Migration Guide - `BackgroundColor` no longer tints the color of images in `ImageBundle` or `ButtonBundle`. Set `UiImage::color` to tint images instead. - The default texture for `UiImage` is now a transparent white square. Use `UiImage::solid_color` to quickly draw debug images. - The default value for `BackgroundColor` and `BorderColor` is now transparent. Set the color to white manually to return to previous behavior.
397 lines
14 KiB
Rust
397 lines
14 KiB
Rust
//! Demonstrates how the to use the size constraints to control the size of a UI node.
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use bevy::{color::palettes::css::*, prelude::*};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_event::<ButtonActivatedEvent>()
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.add_systems(Startup, setup)
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.add_systems(Update, (update_buttons, update_radio_buttons_colors))
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.run();
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}
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const ACTIVE_BORDER_COLOR: Color = Color::Srgba(ANTIQUE_WHITE);
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const INACTIVE_BORDER_COLOR: Color = Color::BLACK;
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const ACTIVE_INNER_COLOR: Color = Color::WHITE;
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const INACTIVE_INNER_COLOR: Color = Color::Srgba(NAVY);
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const ACTIVE_TEXT_COLOR: Color = Color::BLACK;
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const HOVERED_TEXT_COLOR: Color = Color::WHITE;
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const UNHOVERED_TEXT_COLOR: Color = Color::srgb(0.5, 0.5, 0.5);
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#[derive(Component)]
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struct Bar;
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#[derive(Copy, Clone, Debug, Component, PartialEq)]
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enum Constraint {
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FlexBasis,
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Width,
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MinWidth,
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MaxWidth,
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}
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#[derive(Copy, Clone, Component)]
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struct ButtonValue(Val);
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#[derive(Event)]
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struct ButtonActivatedEvent(Entity);
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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// ui camera
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commands.spawn(Camera2dBundle::default());
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let text_style = 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::srgb(0.9, 0.9, 0.9),
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};
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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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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..Default::default()
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},
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background_color: Color::BLACK.into(),
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..Default::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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flex_direction: FlexDirection::Column,
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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..Default::default()
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},
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn(
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TextBundle::from_section("Size Constraints Example", text_style.clone())
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.with_style(Style {
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margin: UiRect::bottom(Val::Px(25.)),
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..Default::default()
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}),
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);
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spawn_bar(parent);
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Column,
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align_items: AlignItems::Stretch,
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padding: UiRect::all(Val::Px(10.)),
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margin: UiRect::top(Val::Px(50.)),
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..Default::default()
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},
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background_color: YELLOW.into(),
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..Default::default()
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})
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.with_children(|parent| {
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for constraint in [
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Constraint::MinWidth,
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Constraint::FlexBasis,
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Constraint::Width,
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Constraint::MaxWidth,
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] {
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spawn_button_row(parent, constraint, text_style.clone());
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}
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});
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});
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});
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}
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fn spawn_bar(parent: &mut ChildBuilder) {
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_basis: Val::Percent(100.0),
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align_self: AlignSelf::Stretch,
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padding: UiRect::all(Val::Px(10.)),
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..Default::default()
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},
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background_color: YELLOW.into(),
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..Default::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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align_items: AlignItems::Stretch,
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width: Val::Percent(100.),
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height: Val::Px(100.),
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padding: UiRect::all(Val::Px(4.)),
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..Default::default()
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},
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background_color: Color::BLACK.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn((
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NodeBundle {
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style: Style {
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..Default::default()
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},
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background_color: Color::WHITE.into(),
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..Default::default()
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},
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Bar,
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));
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});
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});
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}
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fn spawn_button_row(parent: &mut ChildBuilder, constraint: Constraint, text_style: TextStyle) {
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let label = match constraint {
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Constraint::FlexBasis => "flex_basis",
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Constraint::Width => "size",
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Constraint::MinWidth => "min_size",
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Constraint::MaxWidth => "max_size",
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};
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parent
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.spawn(NodeBundle {
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style: Style {
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flex_direction: FlexDirection::Column,
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padding: UiRect::all(Val::Px(2.)),
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align_items: AlignItems::Stretch,
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..Default::default()
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},
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background_color: Color::BLACK.into(),
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..Default::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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flex_direction: FlexDirection::Row,
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justify_content: JustifyContent::End,
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padding: UiRect::all(Val::Px(2.)),
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..Default::default()
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},
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..Default::default()
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})
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.with_children(|parent| {
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// spawn row label
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parent
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.spawn(NodeBundle {
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style: Style {
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min_width: Val::Px(200.),
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max_width: Val::Px(200.),
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justify_content: JustifyContent::Center,
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align_items: AlignItems::Center,
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..Default::default()
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},
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle {
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text: Text::from_section(label.to_string(), text_style.clone()),
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..Default::default()
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});
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});
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// spawn row buttons
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parent
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.spawn(NodeBundle {
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..Default::default()
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})
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.with_children(|parent| {
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spawn_button(
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parent,
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constraint,
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ButtonValue(Val::Auto),
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"Auto".to_string(),
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text_style.clone(),
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true,
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);
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for percent in [0., 25., 50., 75., 100., 125.] {
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spawn_button(
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parent,
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constraint,
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ButtonValue(Val::Percent(percent)),
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format!("{percent}%"),
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text_style.clone(),
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false,
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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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fn spawn_button(
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parent: &mut ChildBuilder,
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constraint: Constraint,
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action: ButtonValue,
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label: String,
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text_style: TextStyle,
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active: bool,
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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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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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border: UiRect::all(Val::Px(2.)),
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margin: UiRect::horizontal(Val::Px(2.)),
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..Default::default()
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},
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background_color: if active {
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ACTIVE_BORDER_COLOR
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} else {
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INACTIVE_BORDER_COLOR
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}
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.into(),
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..Default::default()
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},
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constraint,
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action,
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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(100.),
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justify_content: JustifyContent::Center,
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..Default::default()
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},
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background_color: if active {
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ACTIVE_INNER_COLOR
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} else {
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INACTIVE_INNER_COLOR
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}
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.into(),
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..Default::default()
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})
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.with_children(|parent| {
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parent.spawn(TextBundle {
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text: Text::from_section(
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label,
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TextStyle {
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color: if active {
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ACTIVE_TEXT_COLOR
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} else {
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UNHOVERED_TEXT_COLOR
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},
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..text_style
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},
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)
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.with_justify(JustifyText::Center),
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..Default::default()
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});
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});
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});
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}
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fn update_buttons(
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mut button_query: Query<
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(Entity, &Interaction, &Constraint, &ButtonValue),
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Changed<Interaction>,
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>,
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mut bar_query: Query<&mut Style, With<Bar>>,
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mut text_query: Query<&mut Text>,
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children_query: Query<&Children>,
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mut button_activated_event: EventWriter<ButtonActivatedEvent>,
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) {
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let mut style = bar_query.single_mut();
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for (button_id, interaction, constraint, value) in button_query.iter_mut() {
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match interaction {
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Interaction::Pressed => {
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button_activated_event.send(ButtonActivatedEvent(button_id));
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match constraint {
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Constraint::FlexBasis => {
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style.flex_basis = value.0;
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}
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Constraint::Width => {
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style.width = value.0;
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}
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Constraint::MinWidth => {
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style.min_width = value.0;
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}
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Constraint::MaxWidth => {
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style.max_width = value.0;
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}
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}
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}
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Interaction::Hovered => {
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if let Ok(children) = children_query.get(button_id) {
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for &child in children {
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if let Ok(grand_children) = children_query.get(child) {
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for &grandchild in grand_children {
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if let Ok(mut text) = text_query.get_mut(grandchild) {
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if text.sections[0].style.color != ACTIVE_TEXT_COLOR {
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text.sections[0].style.color = HOVERED_TEXT_COLOR;
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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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}
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Interaction::None => {
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if let Ok(children) = children_query.get(button_id) {
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for &child in children {
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if let Ok(grand_children) = children_query.get(child) {
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for &grandchild in grand_children {
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if let Ok(mut text) = text_query.get_mut(grandchild) {
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if text.sections[0].style.color != ACTIVE_TEXT_COLOR {
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text.sections[0].style.color = UNHOVERED_TEXT_COLOR;
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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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}
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}
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}
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}
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fn update_radio_buttons_colors(
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mut event_reader: EventReader<ButtonActivatedEvent>,
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button_query: Query<(Entity, &Constraint, &Interaction)>,
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mut image_query: Query<&mut UiImage>,
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mut color_query: Query<&mut BackgroundColor>,
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mut text_query: Query<&mut Text>,
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children_query: Query<&Children>,
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) {
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for &ButtonActivatedEvent(button_id) in event_reader.read() {
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let (_, target_constraint, _) = button_query.get(button_id).unwrap();
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for (id, constraint, interaction) in button_query.iter() {
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if target_constraint == constraint {
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let (border_color, inner_color, text_color) = if id == button_id {
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(ACTIVE_BORDER_COLOR, ACTIVE_INNER_COLOR, ACTIVE_TEXT_COLOR)
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} else {
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(
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INACTIVE_BORDER_COLOR,
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INACTIVE_INNER_COLOR,
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if matches!(interaction, Interaction::Hovered) {
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HOVERED_TEXT_COLOR
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} else {
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UNHOVERED_TEXT_COLOR
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},
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)
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};
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image_query.get_mut(id).unwrap().color = border_color;
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for &child in children_query.get(id).into_iter().flatten() {
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color_query.get_mut(child).unwrap().0 = inner_color;
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for &grandchild in children_query.get(child).into_iter().flatten() {
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if let Ok(mut text) = text_query.get_mut(grandchild) {
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text.sections[0].style.color = text_color;
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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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}
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