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>
71 lines
2.6 KiB
Rust
71 lines
2.6 KiB
Rust
//! Provides a way to automatically set the mouse cursor based on hovered entity.
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use bevy_app::{App, Plugin, PreUpdate};
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use bevy_ecs::{
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entity::Entity,
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hierarchy::ChildOf,
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resource::Resource,
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schedule::IntoScheduleConfigs,
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system::{Commands, Query, Res},
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};
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use bevy_picking::{hover::HoverMap, pointer::PointerId, PickingSystems};
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use bevy_window::Window;
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use bevy_winit::cursor::CursorIcon;
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/// A component that specifies the cursor icon to be used when the mouse is not hovering over
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/// any other entity. This is used to set the default cursor icon for the window.
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#[derive(Resource, Debug, Clone, Default)]
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pub struct DefaultCursorIcon(pub CursorIcon);
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/// System which updates the window cursor icon whenever the mouse hovers over an entity with
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/// a [`CursorIcon`] component. If no entity is hovered, the cursor icon is set to
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/// the cursor in the [`DefaultCursorIcon`] resource.
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pub(crate) fn update_cursor(
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mut commands: Commands,
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hover_map: Option<Res<HoverMap>>,
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parent_query: Query<&ChildOf>,
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cursor_query: Query<&CursorIcon>,
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mut q_windows: Query<(Entity, &mut Window, Option<&CursorIcon>)>,
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r_default_cursor: Res<DefaultCursorIcon>,
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) {
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let cursor = hover_map.and_then(|hover_map| match hover_map.get(&PointerId::Mouse) {
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Some(hover_set) => hover_set.keys().find_map(|entity| {
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cursor_query.get(*entity).ok().or_else(|| {
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parent_query
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.iter_ancestors(*entity)
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.find_map(|e| cursor_query.get(e).ok())
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})
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}),
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None => None,
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});
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let mut windows_to_change: Vec<Entity> = Vec::new();
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for (entity, _window, prev_cursor) in q_windows.iter_mut() {
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match (cursor, prev_cursor) {
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(Some(cursor), Some(prev_cursor)) if cursor == prev_cursor => continue,
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(None, None) => continue,
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_ => {
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windows_to_change.push(entity);
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}
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}
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}
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windows_to_change.iter().for_each(|entity| {
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if let Some(cursor) = cursor {
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commands.entity(*entity).insert(cursor.clone());
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} else {
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commands.entity(*entity).insert(r_default_cursor.0.clone());
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}
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});
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}
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/// Plugin that supports automatically changing the cursor based on the hovered entity.
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pub struct CursorIconPlugin;
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impl Plugin for CursorIconPlugin {
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fn build(&self, app: &mut App) {
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if app.world().get_resource::<DefaultCursorIcon>().is_none() {
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app.init_resource::<DefaultCursorIcon>();
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}
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app.add_systems(PreUpdate, update_cursor.in_set(PickingSystems::Last));
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}
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}
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