perspective 2.0.0

A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
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////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2018, the Perspective Authors.
//
// This file is part of the Perspective library, distributed under the terms
// of the Apache License 2.0.  The full license can be found in the LICENSE
// file.

use std::cell::RefCell;
use std::future::Future;
use std::rc::Rc;

use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;

use super::mimetype::*;
use crate::js::clipboard_item::*;
use crate::utils::*;
use crate::*;

/// Copy a `JsPerspectiveView` to the clipboard as a CSV.
pub fn copy_to_clipboard(
    view: impl Future<Output = Result<web_sys::Blob, ApiError>>,
    mimetype: MimeType,
) -> impl Future<Output = ApiResult<()>> {
    let js_ref: Rc<RefCell<Option<web_sys::Blob>>> = Rc::new(RefCell::new(None));
    poll(0, mimetype, js_ref.clone()).unwrap();
    async move {
        let js_val = view.await?;
        *js_ref.borrow_mut() = Some(js_val);
        Ok(())
    }
}

/// This method must be called from an event handler, subject to the browser's
/// restrictions on clipboard access.  See
/// [ws](https://www.w3.org/TR/clipboard-apis/#allow-read-clipboard).
fn poll(
    count: u32,
    mimetype: MimeType,
    js_ref: Rc<RefCell<Option<web_sys::Blob>>>,
) -> ApiResult<()> {
    if let Some(js_val) = js_ref.borrow().as_ref() {
        let options = js_sys::Object::new();
        js_sys::Reflect::set(&options, &mimetype.into(), js_val)?;
        let item = ClipboardItem::new(&options);
        let items = std::iter::once(item).collect::<js_sys::Array>();
        let _promise = web_sys::window()
            .unwrap()
            .navigator()
            .clipboard()
            .into_apierror()?
            .write(&items.into());
    } else {
        clone!(js_ref);
        if count == 200 {
            tracing::warn!("Clipboard handler surpassed 10s");
        }

        let f: js_sys::Function =
            Closure::once(Box::new(move || poll(count + 1, mimetype, js_ref)))
                .into_js_value()
                .unchecked_into();

        web_sys::window()
            .unwrap()
            .set_timeout_with_callback_and_timeout_and_arguments_0(&f, 50)?;
    }

    Ok(())
}