nightshade 0.13.3

A cross-platform data-oriented game engine.
Documentation 
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use crate::ecs::ui::components::UiNodeContent;
use crate::ecs::world::World;

pub fn ui_theme_apply_system(world: &mut World) {
    if !world.resources.retained_ui.enabled {
        return;
    }

    let generation = world.resources.retained_ui.theme_state.generation;
    if generation
        == world
            .resources
            .retained_ui
            .theme_state
            .last_applied_generation
    {
        return;
    }
    world
        .resources
        .retained_ui
        .theme_state
        .last_applied_generation = generation;

    let theme = world
        .resources
        .retained_ui
        .theme_state
        .active_theme()
        .clone();

    let entities: Vec<freecs::Entity> = world
        .ui
        .query_entities(crate::ecs::world::UI_THEME_BINDING)
        .collect();

    for entity in entities {
        let binding = match world.ui.get_ui_theme_binding(entity) {
            Some(binding) => binding.clone(),
            None => continue,
        };

        if let Some(node_color) = world.ui.get_ui_node_color_mut(entity) {
            for (state_index, role) in binding.color_roles.iter().enumerate() {
                if let Some(role) = role {
                    node_color.colors[state_index] = Some(role.resolve(&theme));
                }
            }
        }

        if let Some(border_role) = binding.border_color_role
            && let Some(content) = world.ui.get_ui_node_content_mut(entity)
            && let UiNodeContent::Rect { border_color, .. } = content
        {
            *border_color = border_role.resolve(&theme);
        }
    }
}