bevy_extended_ui 1.0.0

Create simply ui's with css and html for bevy.
Documentation 
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pub mod builder;
pub mod converter;
pub mod reload;
mod bindings;

pub use inventory;

use std::collections::HashMap;
use std::sync::atomic::{AtomicUsize, Ordering};
use bevy::ecs::system::SystemId;
use bevy::prelude::*;
use crate::html::bindings::HtmlEventBindingsPlugin;
use crate::html::builder::HtmlBuilderSystem;
use crate::html::converter::HtmlConverterSystem;
use crate::html::reload::HtmlReloadPlugin;

use crate::io::{CssAsset, HtmlAsset};
use crate::styles::Style;
use crate::styles::parser::apply_property_to_style;
use crate::widgets::{Body, Button, CheckBox, ChoiceBox, Div, Divider, FieldSet, Headline, Img, InputField, Paragraph, ProgressBar, RadioButton, Scrollbar, Slider, SwitchButton, ToggleButton, Widget};

pub static HTML_ID_COUNTER: AtomicUsize = AtomicUsize::new(1);

#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
pub enum HtmlSystemSet {
    Convert,
    Build,
    ShowWidgets,
    Bindings,
}

#[derive(Component, Reflect, Debug, Clone)]
#[reflect(Component)]
pub struct HtmlSource {
    pub handle: Handle<HtmlAsset>,
    pub source_id: String,
    pub controller: Option<String>,
}

impl HtmlSource {
    pub fn from_handle(handle: Handle<HtmlAsset>) -> Self {
        Self {
            handle,
            source_id: String::new(),
            controller: None,
        }
    }

    /// Returns the asset path (relative to assets/) of this HtmlAsset.
    /// Example: "examples/test.html"
    pub fn get_source_path(&self) -> String {
        self.handle
            .path()
            .expect("Failed to get source path!")
            .path()
            .to_string_lossy()
            .replace('\\', "/")
    }
}

#[derive(Event, Message)]
pub struct HtmlAllWidgetsSpawned;

#[derive(Event, Message)]
pub struct HtmlAllWidgetsVisible;

#[derive(Component, Default)]
pub struct HtmlInitEmitted;

#[derive(Resource, Default)]
pub struct HtmlInitDelay(pub Option<u8>);

#[derive(Component)]
pub struct NeedHidden;

#[derive(Resource, Default)]
pub struct ShowWidgetsTimer {
    pub timer: Timer,
    pub active: bool,
}

#[derive(Event, Message)]
pub struct HtmlChangeEvent;

/// A simple explicit "UI needs rebuild" flag.
/// We use this because mutating the internal HashMap of HtmlStructureMap
/// does NOT reliably trigger `resource_changed::<HtmlStructureMap>()`.
#[derive(Resource, Default)]
pub struct HtmlDirty(pub bool);

/// Component storing parsed inline CSS (`style="..."`) as your custom Style struct.
#[derive(Component, Reflect, Debug, Clone)]
#[reflect(Component)]
pub struct HtmlStyle(pub Style);

impl HtmlStyle {
    /// Parses inline CSS style declarations ("key: value; ...") into Style.
    pub fn from_str(style_code: &str) -> HtmlStyle {
        let mut style = Style::default();

        for part in style_code.split(';') {
            let trimmed = part.trim();
            if trimmed.is_empty() {
                continue;
            }

            let (name, value) = if let Some((k, v)) = trimmed.split_once(':') {
                (k.trim(), v.trim())
            } else if let Some((k, v)) = trimmed.split_once(' ') {
                (k.trim(), v.trim())
            } else {
                continue;
            };

            apply_property_to_style(&mut style, name, value);
        }

        HtmlStyle(style)
    }
}

#[derive(Debug, Clone, Default)]
pub struct HtmlMeta {
    /// All referenced CSS assets for this node.
    pub css: Vec<Handle<CssAsset>>,
    pub id: Option<String>,
    pub class: Option<Vec<String>>,
    pub style: Option<HtmlStyle>,
}

#[derive(Debug, Clone, Default)]
pub struct HtmlStates {
    pub hidden: bool,
    pub disabled: bool,
    pub readonly: bool,
}

/// Your current DOM model.
#[derive(Debug, Clone)]
pub enum HtmlWidgetNode {
    /// The root `<body>` element of the HTML structure.
    Body(
        Body,
        HtmlMeta,
        HtmlStates,
        Vec<HtmlWidgetNode>,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A `<div>` container element with nested child nodes.
    Div(
        Div,
        HtmlMeta,
        HtmlStates,
        Vec<HtmlWidgetNode>,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A `<divider>` element.
    Divider(
        Divider,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A `<button>` element.
    Button(
        Button,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A checkbox `<checkbox>`.
    CheckBox(
        CheckBox,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A dropdown or select box.
    ChoiceBox(
        ChoiceBox,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A `<fieldset>` container element with nested child nodes from type `<radio> and <toggle>`.
    FieldSet(
        FieldSet,
        HtmlMeta,
        HtmlStates,
        Vec<HtmlWidgetNode>,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A heading element (`<h1>`-`<h6>`).
    Headline(
        Headline,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A img element (`<img>`).
    Img(Img, HtmlMeta, HtmlStates, HtmlEventBindings, Widget, HtmlID),
    /// An `<input type="text">` field.
    Input(
        InputField,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A paragraph `<p>`.
    Paragraph(
        Paragraph,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A progressbar `<progressbar>`.
    ProgressBar(
        ProgressBar,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A radio-button `<radio>`.
    RadioButton(
        RadioButton,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A slider input `<slider>`).
    Scrollbar(
        Scrollbar,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A slider input `<slider>`).
    Slider(
        Slider,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A switch-button `<switch>`).
    SwitchButton(
        SwitchButton,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
    /// A toggle-button `<toggle>`.
    ToggleButton(
        ToggleButton,
        HtmlMeta,
        HtmlStates,
        HtmlEventBindings,
        Widget,
        HtmlID,
    ),
}

/// Stores all parsed HTML structures keyed by `<meta name="...">`.
#[derive(Resource)]
pub struct HtmlStructureMap {
    pub html_map: HashMap<String, Vec<HtmlWidgetNode>>,
    pub active: Option<String>,
}

impl Default for HtmlStructureMap {
    fn default() -> Self {
        Self {
            html_map: HashMap::new(),
            active: None,
        }
    }
}

#[derive(Clone, Debug, PartialEq, Component)]
pub struct HtmlID(pub usize);

impl Default for HtmlID {
    fn default() -> Self {
        Self(HTML_ID_COUNTER.fetch_add(1, Ordering::Relaxed))
    }
}

pub struct HtmlFnRegistration {
    pub name: &'static str,
    pub build: fn(&mut World) -> SystemId<In<HtmlEvent>, ()>,
}

inventory::collect!(HtmlFnRegistration);

#[derive(Clone, Copy)]
pub struct HtmlEvent {
    pub entity: Entity,
    pub object: HtmlEventObject,
}

impl HtmlEvent {
    pub fn target(&self) -> Entity { self.entity }

}

#[derive(Clone, Copy)]
pub enum HtmlEventObject {
    Click(HtmlClick),
    Change(HtmlChange),
    Init(HtmlInit),
    MouseOut(HtmlMouseOut),
    MouseOver(HtmlMouseOver),
}

#[derive(Default, Resource)]
pub struct HtmlFunctionRegistry {
    pub click: HashMap<String, SystemId<In<HtmlEvent>>>,
    pub over: HashMap<String, SystemId<In<HtmlEvent>>>,
    pub out: HashMap<String, SystemId<In<HtmlEvent>>>,
    pub change: HashMap<String, SystemId<In<HtmlEvent>>>,
    pub init: HashMap<String, SystemId<In<HtmlEvent>>>,
}

#[derive(Component, Reflect, Default, Clone, Debug)]
#[reflect(Component)]
pub struct HtmlEventBindings {
    pub onclick: Option<String>,
    pub onmouseover: Option<String>,
    pub onmouseout: Option<String>,
    pub onchange: Option<String>,
    pub oninit: Option<String>,
}

#[derive(EntityEvent, Clone, Copy)]
pub struct HtmlClick {
    #[event_target]
    pub entity: Entity,
}

#[derive(EntityEvent, Clone, Copy)]
pub struct HtmlMouseOver {
    #[event_target]
    pub entity: Entity,
}

#[derive(EntityEvent, Clone, Copy)]
pub struct HtmlMouseOut {
    #[event_target]
    pub entity: Entity,
}

#[derive(EntityEvent, Clone, Copy)]
pub struct HtmlChange {
    #[event_target]
    pub entity: Entity,
}

#[derive(EntityEvent, Clone, Copy)]
pub struct HtmlInit {
    #[event_target]
    pub entity: Entity,
}

/// Main plugin for HTML UI: converter + builder + reload integration.
pub struct ExtendedUiHtmlPlugin;

impl Plugin for ExtendedUiHtmlPlugin {
    fn build(&self, app: &mut App) {
        app.add_message::<HtmlChangeEvent>();

        app.init_resource::<HtmlStructureMap>();
        app.init_resource::<HtmlFunctionRegistry>();
        app.init_resource::<HtmlDirty>();
        app.init_resource::<HtmlInitDelay>();

        app.register_type::<HtmlEventBindings>();
        app.register_type::<HtmlSource>();
        app.register_type::<HtmlStyle>();

        app.configure_sets(
            Update,
            (
                HtmlSystemSet::Convert,
                HtmlSystemSet::Build,
                HtmlSystemSet::ShowWidgets,
                HtmlSystemSet::Bindings,
            )
                .chain(),
        );
        app.add_plugins((
            HtmlConverterSystem,
            HtmlBuilderSystem,
            HtmlReloadPlugin,
            HtmlEventBindingsPlugin,
        ));

        app.add_systems(Startup, register_html_fns);
    }
}

pub fn register_html_fns(world: &mut World) {
    let mut to_insert: Vec<(String, SystemId<In<HtmlEvent>>)> = Vec::new();

    for item in inventory::iter::<HtmlFnRegistration> {
        let id = (item.build)(world);
        to_insert.push((item.name.to_string(), id));
    }

    let mut reg = world.resource_mut::<HtmlFunctionRegistry>();
    for (name, id) in to_insert {
        reg.change.insert(name.clone(), id);
        reg.click.insert(name.clone(), id);
        reg.init.insert(name.clone(), id);
        reg.out.insert(name.clone(), id);
        reg.over.insert(name.clone(), id);
        debug!("Registered html fn '{name}' with id {id:?}");
    }
}