|
| 1 | +use bevy_a11y::{ |
| 2 | + accesskit::{NodeBuilder, Rect, Role}, |
| 3 | + AccessibilityNode, |
| 4 | +}; |
| 5 | +use bevy_app::{App, Plugin}; |
| 6 | + |
| 7 | +use bevy_ecs::{ |
| 8 | + prelude::Entity, |
| 9 | + query::{Changed, Or, Without}, |
| 10 | + system::{Commands, Query}, |
| 11 | +}; |
| 12 | +use bevy_hierarchy::Children; |
| 13 | + |
| 14 | +use bevy_render::prelude::Camera; |
| 15 | +use bevy_text::Text; |
| 16 | +use bevy_transform::prelude::GlobalTransform; |
| 17 | + |
| 18 | +use crate::{ |
| 19 | + prelude::{Button, Label}, |
| 20 | + Node, UiImage, |
| 21 | +}; |
| 22 | + |
| 23 | +fn calc_name(texts: &Query<&Text>, children: &Children) -> Option<Box<str>> { |
| 24 | + let mut name = None; |
| 25 | + for child in children.iter() { |
| 26 | + if let Ok(text) = texts.get(*child) { |
| 27 | + let values = text |
| 28 | + .sections |
| 29 | + .iter() |
| 30 | + .map(|v| v.value.to_string()) |
| 31 | + .collect::<Vec<String>>(); |
| 32 | + name = Some(values.join(" ")); |
| 33 | + } |
| 34 | + } |
| 35 | + name.map(|v| v.into_boxed_str()) |
| 36 | +} |
| 37 | + |
| 38 | +fn calc_bounds( |
| 39 | + camera: Query<(&Camera, &GlobalTransform)>, |
| 40 | + mut nodes: Query< |
| 41 | + (&mut AccessibilityNode, &Node, &GlobalTransform), |
| 42 | + Or<(Changed<Node>, Changed<GlobalTransform>)>, |
| 43 | + >, |
| 44 | +) { |
| 45 | + if let Ok((camera, camera_transform)) = camera.get_single() { |
| 46 | + for (mut accessible, node, transform) in &mut nodes { |
| 47 | + if let Some(translation) = |
| 48 | + camera.world_to_viewport(camera_transform, transform.translation()) |
| 49 | + { |
| 50 | + let bounds = Rect::new( |
| 51 | + translation.x.into(), |
| 52 | + translation.y.into(), |
| 53 | + (translation.x + node.calculated_size.x).into(), |
| 54 | + (translation.y + node.calculated_size.y).into(), |
| 55 | + ); |
| 56 | + accessible.set_bounds(bounds); |
| 57 | + } |
| 58 | + } |
| 59 | + } |
| 60 | +} |
| 61 | + |
| 62 | +fn button_changed( |
| 63 | + mut commands: Commands, |
| 64 | + mut query: Query<(Entity, &Children, Option<&mut AccessibilityNode>), Changed<Button>>, |
| 65 | + texts: Query<&Text>, |
| 66 | +) { |
| 67 | + for (entity, children, accessible) in &mut query { |
| 68 | + let name = calc_name(&texts, children); |
| 69 | + if let Some(mut accessible) = accessible { |
| 70 | + accessible.set_role(Role::Button); |
| 71 | + if let Some(name) = name { |
| 72 | + accessible.set_name(name); |
| 73 | + } else { |
| 74 | + accessible.clear_name(); |
| 75 | + } |
| 76 | + } else { |
| 77 | + let mut node = NodeBuilder::new(Role::Button); |
| 78 | + if let Some(name) = name { |
| 79 | + node.set_name(name); |
| 80 | + } |
| 81 | + commands |
| 82 | + .entity(entity) |
| 83 | + .insert(AccessibilityNode::from(node)); |
| 84 | + } |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | +fn image_changed( |
| 89 | + mut commands: Commands, |
| 90 | + mut query: Query< |
| 91 | + (Entity, &Children, Option<&mut AccessibilityNode>), |
| 92 | + (Changed<UiImage>, Without<Button>), |
| 93 | + >, |
| 94 | + texts: Query<&Text>, |
| 95 | +) { |
| 96 | + for (entity, children, accessible) in &mut query { |
| 97 | + let name = calc_name(&texts, children); |
| 98 | + if let Some(mut accessible) = accessible { |
| 99 | + accessible.set_role(Role::Image); |
| 100 | + if let Some(name) = name { |
| 101 | + accessible.set_name(name); |
| 102 | + } else { |
| 103 | + accessible.clear_name(); |
| 104 | + } |
| 105 | + } else { |
| 106 | + let mut node = NodeBuilder::new(Role::Image); |
| 107 | + if let Some(name) = name { |
| 108 | + node.set_name(name); |
| 109 | + } |
| 110 | + commands |
| 111 | + .entity(entity) |
| 112 | + .insert(AccessibilityNode::from(node)); |
| 113 | + } |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | +fn label_changed( |
| 118 | + mut commands: Commands, |
| 119 | + mut query: Query<(Entity, &Text, Option<&mut AccessibilityNode>), Changed<Label>>, |
| 120 | +) { |
| 121 | + for (entity, text, accessible) in &mut query { |
| 122 | + let values = text |
| 123 | + .sections |
| 124 | + .iter() |
| 125 | + .map(|v| v.value.to_string()) |
| 126 | + .collect::<Vec<String>>(); |
| 127 | + let name = Some(values.join(" ").into_boxed_str()); |
| 128 | + if let Some(mut accessible) = accessible { |
| 129 | + accessible.set_role(Role::LabelText); |
| 130 | + if let Some(name) = name { |
| 131 | + accessible.set_name(name); |
| 132 | + } else { |
| 133 | + accessible.clear_name(); |
| 134 | + } |
| 135 | + } else { |
| 136 | + let mut node = NodeBuilder::new(Role::LabelText); |
| 137 | + if let Some(name) = name { |
| 138 | + node.set_name(name); |
| 139 | + } |
| 140 | + commands |
| 141 | + .entity(entity) |
| 142 | + .insert(AccessibilityNode::from(node)); |
| 143 | + } |
| 144 | + } |
| 145 | +} |
| 146 | + |
| 147 | +/// `AccessKit` integration for `bevy_ui`. |
| 148 | +pub(crate) struct AccessibilityPlugin; |
| 149 | + |
| 150 | +impl Plugin for AccessibilityPlugin { |
| 151 | + fn build(&self, app: &mut App) { |
| 152 | + app.add_system(calc_bounds) |
| 153 | + .add_system(button_changed) |
| 154 | + .add_system(image_changed) |
| 155 | + .add_system(label_changed); |
| 156 | + } |
| 157 | +} |
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