perspective-viewer 4.5.0

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// ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
// ┃ This file is part of the Perspective library, distributed under the terms ┃
// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

//! Theme reset / set task. Replaces the inlined StatusBar callback that
//! reached into `Session::get_view()` for the post-update restyle.

use perspective_js::utils::*;

use crate::presentation::Presentation;
use crate::renderer::Renderer;
use crate::session::Session;

/// Apply a theme change and restyle the active view.
///
/// `theme = None` resets to the first available theme; `theme = Some(name)`
/// sets the named theme. In both cases the post-update path is the same:
/// fetch the current view from the session and ask the renderer to
/// re-style it. Components dispatch this task instead of reading
/// `Session::get_view()` themselves.
pub fn update_theme(
    session: &Session,
    renderer: &Renderer,
    presentation: &Presentation,
    theme: Option<String>,
) {
    let session = session.clone();
    let renderer = renderer.clone();
    let presentation = presentation.clone();
    ApiFuture::spawn(async move {
        match theme {
            Some(name) => {
                presentation.set_theme_name(Some(&name)).await?;
            },
            None => {
                presentation.reset_theme().await?;
            },
        }

        let view = session.get_view().into_apierror()?;
        renderer.restyle_all(&view).await
    });
}