65bddbd3e4
# Objective This PR introduces Bevy Feathers, an opinionated widget toolkit and theming system intended for use by the Bevy Editor, World Inspector, and other tools. The `bevy_feathers` crate is incomplete and hidden behind an experimental feature flag. The API is going to change significantly before release. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
63 lines
1.9 KiB
Rust
63 lines
1.9 KiB
Rust
//! A framework for inheritable font styles.
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use bevy_app::Propagate;
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use bevy_asset::{AssetServer, Handle};
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use bevy_ecs::{
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component::Component,
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lifecycle::Insert,
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observer::On,
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system::{Commands, Query, Res},
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};
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use bevy_text::{Font, TextFont};
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use crate::handle_or_path::HandleOrPath;
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/// A component which, when inserted on an entity, will load the given font and propagate it
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/// downward to any child text entity that has the [`ThemedText`](crate::theme::ThemedText) marker.
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#[derive(Component, Default, Clone, Debug)]
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pub struct InheritableFont {
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/// The font handle or path.
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pub font: HandleOrPath<Font>,
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/// The desired font size.
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pub font_size: f32,
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}
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impl InheritableFont {
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/// Create a new `InheritableFont` from a handle.
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pub fn from_handle(handle: Handle<Font>) -> Self {
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Self {
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font: HandleOrPath::Handle(handle),
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font_size: 16.0,
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}
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}
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/// Create a new `InheritableFont` from a path.
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pub fn from_path(path: &str) -> Self {
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Self {
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font: HandleOrPath::Path(path.to_string()),
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font_size: 16.0,
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}
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}
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}
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/// An observer which looks for changes to the `InheritableFont` component on an entity, and
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/// propagates downward the font to all participating text entities.
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pub(crate) fn on_changed_font(
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ev: On<Insert, InheritableFont>,
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font_style: Query<&InheritableFont>,
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assets: Res<AssetServer>,
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mut commands: Commands,
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) {
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if let Ok(style) = font_style.get(ev.target()) {
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if let Some(font) = match style.font {
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HandleOrPath::Handle(ref h) => Some(h.clone()),
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HandleOrPath::Path(ref p) => Some(assets.load::<Font>(p)),
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} {
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commands.entity(ev.target()).insert(Propagate(TextFont {
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font,
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font_size: style.font_size,
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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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