5f86668bbb
Fixes #17856. ## Migration Guide - `EventWriter::send` has been renamed to `EventWriter::write`. - `EventWriter::send_batch` has been renamed to `EventWriter::write_batch`. - `EventWriter::send_default` has been renamed to `EventWriter::write_default`. --------- Co-authored-by: François Mockers <mockersf@gmail.com>
50 lines
1.7 KiB
Rust
50 lines
1.7 KiB
Rust
//! This module contains a basic backend that implements picking for window
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//! entities.
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//!
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//! Pointers can exist on windows, images, and gpu texture views. With
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//! [`update_window_hits`] enabled, when a pointer hovers over a window that
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//! window will be inserted as a pointer hit, listed behind all other pointer
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//! hits. This means that when the pointer isn't hovering any other entities,
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//! the picking events will be routed to the window.
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//!
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//! ## Implementation Notes
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//!
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//! - This backend does not provide `position` or `normal` in `HitData`.
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use core::f32;
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use bevy_ecs::prelude::*;
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use bevy_render::camera::NormalizedRenderTarget;
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use crate::{
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backend::{HitData, PointerHits},
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pointer::{Location, PointerId, PointerLocation},
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};
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/// Generates pointer hit events for window entities.
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///
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/// A pointer is treated as hitting a window when it is located on that window. The order
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/// of the hit event is negative infinity, meaning it should appear behind all other entities.
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///
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/// The depth of the hit will be listed as zero.
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pub fn update_window_hits(
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pointers: Query<(&PointerId, &PointerLocation)>,
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mut output_events: EventWriter<PointerHits>,
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) {
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for (pointer_id, pointer_location) in pointers.iter() {
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if let Some(Location {
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target: NormalizedRenderTarget::Window(window_ref),
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..
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}) = pointer_location.location
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{
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let entity = window_ref.entity();
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let hit_data = HitData::new(entity, 0.0, None, None);
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output_events.write(PointerHits::new(
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*pointer_id,
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vec![(entity, hit_data)],
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f32::NEG_INFINITY,
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));
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}
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}
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}
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