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//! ECS rendering bundle

use amethyst_assets::Processor;
use amethyst_core::bundle::{Result, SystemBundle};
use amethyst_core::specs::prelude::DispatcherBuilder;
use std::hash::Hash;
use std::marker::PhantomData;

use super::*;

/// UI bundle
///
/// Will register all necessary components and systems needed for UI, along with any resources.
/// The generic types A and B represent the A and B generic parameter of the InputHandler<A,B>.
///
/// Will fail with error 'No resource with the given id' if the InputBundle is not added.
pub struct UiBundle<A, B> {
    _marker1: PhantomData<A>,
    _marker2: PhantomData<B>,
}

impl<A, B> UiBundle<A, B> {
    /// Create a new UI bundle
    pub fn new() -> Self {
        UiBundle {
            _marker1: PhantomData,
            _marker2: PhantomData,
        }
    }
}

impl<'a, 'b, A, B> SystemBundle<'a, 'b> for UiBundle<A, B>
where
    A: Send + Sync + Eq + Hash + Clone + 'static,
    B: Send + Sync + Eq + Hash + Clone + 'static,
{
    fn build(self, builder: &mut DispatcherBuilder<'a, 'b>) -> Result<()> {
        builder.add(Processor::<FontAsset>::new(), "font_processor", &[]);
        builder.add(UiSystem::new(), "ui_system", &["font_processor"]);
        builder.add(ResizeSystem::new(), "ui_resize_system", &[]);
        builder.add(UiMouseSystem::<A, B>::new(), "ui_mouse_system", &[]);
        builder.add(UiLayoutSystem::new(), "ui_layout", &["ui_system"]);
        builder.add(
            UiParentSystem::default(),
            "ui_parent",
            &["transform_system", "ui_layout"],
        );
        Ok(())
    }
}