oxivgl 0.1.1

Safe no_std Rust bindings for LVGL — embedded GUI on ESP32 and host SDL2
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#![cfg_attr(target_arch = "xtensa", no_std, no_main)]
#![cfg_attr(
    target_arch = "xtensa",
    feature(impl_trait_in_assoc_type, type_alias_impl_trait)
)]
// SPDX-License-Identifier: MIT OR Apache-2.0
//! Event Bubble — Demonstrate event bubbling
//!
//! 30 buttons in a flex container with event bubbling enabled. Clicking any
//! button turns it red — the container's single event handler catches all
//! bubbled CLICKED events.

use oxivgl::view::NavAction;
use oxivgl::{
    style::{palette_main, Palette, Selector},
    view::{register_event_on, View},
    enums::EventCode,
    event::Event,
    layout::FlexFlow,
    widgets::{Button, Label, Obj, WidgetError},
};

#[derive(Default)]
struct EventBubble {
    cont: Option<Obj<'static>>,
    _buttons: Option<heapless::Vec<Button<'static>, 30>>,
    _labels: Option<heapless::Vec<Label<'static>, 30>>,
}

impl View for EventBubble {
    fn create(&mut self, container: &Obj<'static>) -> Result<(), WidgetError> {

        let cont = Obj::new(container)?;
        cont.size(290, 200).center();
        cont.set_flex_flow(FlexFlow::RowWrap);

        let mut buttons = heapless::Vec::<Button<'static>, 30>::new();
        let mut labels = heapless::Vec::<Label<'static>, 30>::new();

        for i in 0..30u32 {
            let btn = Button::new(&cont)?;
            btn.size(70, 50);
            btn.bubble_events();

            let label = Label::new(&btn)?;
            let mut buf = heapless::String::<4>::new();
            let _ = core::fmt::Write::write_fmt(&mut buf, format_args!("{}", i));
            label.text(&buf).center();

            let _ = buttons.push(btn);
            let _ = labels.push(label);
        }

                self.cont = Some(cont);
        self._buttons = Some(buttons);
        self._labels = Some(labels);
        Ok(())
    }

    fn register_events(&mut self) {
        if let Some(ref cont) = self.cont {
            register_event_on(self, cont.handle());
        }
    }

    fn on_event(&mut self, event: &Event) -> NavAction {
        if event.code() != EventCode::CLICKED {
            return NavAction::None;
        }
        let target = event.target_handle();
        if let Some(ref cont) = self.cont {
            if target == cont.handle() {
                return NavAction::None;
            }
        }
        event.target_style_bg_color(palette_main(Palette::Red), Selector::DEFAULT);
        NavAction::None
    }

    fn update(&mut self) -> Result<NavAction, WidgetError> {
        Ok(NavAction::None)
    }
}

oxivgl_examples_common::example_main!(EventBubble::default());