egui_wings

此crate便于在主机和多个访客WASM模块之间共享egui::Context。这允许WASM插件绘制UI并通过主机轻松显示。

用法

以下代码片段展示了如何从WASM插件（完整示例可在egui_wings_example文件夹中找到）中使用egui_wings。它定义了一个WingsSystem，该系统将存储WASM插件的状态。在每一帧，都会调用draw_ui方法。它通过系统依赖访问主机egui::Context，然后通过正常的egui调用绘制UI。

use egui_wings::*;
use example_host::*;
use wings::*;

instantiate_systems!(ExampleHost, [PluginSystem]);

/// An object that will be instantiated inside a WASM plugin.
#[export_system]
pub struct PluginSystem {
    /// A handle for accessing system dependencies.
    ctx: WingsContextHandle<Self>,
}

impl PluginSystem {
    /// Submits the `egui` commands to draw the debug windows.
    fn draw_ui(&mut self, _: &example_host::on::Render) {
        let egui = self.ctx.get::<dyn Egui>();
        Window::new("webassembly says hello!")
            .resizable(true)
            .vscroll(true)
            .default_open(false)
        .show(&egui.context(), |ui| {
            ui.label("Hello there!");
        });
    }
}

impl WingsSystem for PluginSystem {
    const DEPENDENCIES: Dependencies = dependencies().with::<dyn Egui>();

    const EVENT_HANDLERS: EventHandlers<Self> = event_handlers().with(Self::draw_ui);

    fn new(ctx: WingsContextHandle<Self>) -> Self {
        Self { ctx }
    }
}