gled 2.3.4

gled is an application for creating animations and effects on artnet or wled light installations
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use super::{App, svg::Svg};
use crate::pipeline::preview::Preview;
use egui::{Color32, Image, Sense, Vec2, load::SizedTexture};
use egui_tiles::UiResponse;

impl App {
    pub fn preview(&mut self, ui: &mut egui::Ui) -> UiResponse {
        if let Some(uv) = Svg::preview_uv() {
            let size = if uv.max.x > uv.max.y {
                Vec2::new(
                    ui.available_width()
                        .min(ui.available_height() * uv.max.x / uv.max.y),
                    ui.available_height()
                        .min(ui.available_width() * uv.max.y / uv.max.x),
                )
            } else {
                Vec2::new(
                    ui.available_width()
                        .min(ui.available_height() * uv.max.y / uv.max.x),
                    ui.available_height()
                        .min(ui.available_width() * uv.max.x / uv.max.y),
                )
            };

            let res = self.svg_mut().and_then(|svg| svg.image()).map(|image| {
                ui.add(
                    Image::new(SizedTexture::new(image.texture_id(ui.ctx()), size))
                        .uv(uv)
                        .bg_fill(Color32::BLACK),
                )
            });
            let preview = Image::new(SizedTexture::new(Preview::texture_id(), size))
                .uv(uv)
                .sense(Sense::drag());
            match res {
                Some(res) => {
                    if ui.put(res.rect, preview).drag_started() {
                        return UiResponse::DragStarted;
                    }
                }
                None => {
                    ui.add(preview);
                }
            }
        }

        UiResponse::None
    }
}