popper-rs 0.5.0

A crate for using Popper in Rust
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//! Modifiers

mod offset;
mod prevent_overflow;
mod same_width;

pub use offset::*;
pub use prevent_overflow::*;
pub use same_width::*;

use crate::sys::ModifierArguments;
use gloo_utils::format::JsValueSerdeExt;
use serde_json::json;
use std::borrow::Cow;
use std::rc::Rc;
use wasm_bindgen::JsValue;
use wasm_bindgen::closure::Closure;

/// Definition of a modifier function.
///
/// A modifier function will be called from popper.js and thus needs to be valid for the lifetime
/// of the popper instance. Dropping the closure will invalidate the function and it will no longer
/// be executed. This means that you need to keep a reference to the function for as long as it
/// should be in used.
#[derive(Clone, Debug)]
pub struct ModifierFn(#[allow(clippy::type_complexity)] pub Rc<Closure<dyn Fn(ModifierArguments)>>);

impl PartialEq for ModifierFn {
    fn eq(&self, other: &Self) -> bool {
        Rc::ptr_eq(&self.0, &other.0)
    }
}

/// Definition of a modifier effect function.
///
/// A modifier function will be called from popper.js and thus needs to be valid for the lifetime
/// of the popper instance. Dropping the closure will invalidate the function and it will no longer
/// be executed. This means that you need to keep a reference to the function for as long as it
/// should be in used.
#[derive(Clone, Debug)]
pub struct EffectFn(#[allow(clippy::type_complexity)] pub Rc<Closure<dyn Fn(ModifierArguments)>>);

impl PartialEq for EffectFn {
    fn eq(&self, other: &Self) -> bool {
        Rc::ptr_eq(&self.0, &other.0)
    }
}

/// Standard modifiers
#[derive(Clone, Debug, PartialEq)]
pub enum Modifier {
    Offset(Offset),
    PreventOverflow(PreventOverflow),
    SameWidth(SameWidth),
    Custom {
        name: Cow<'static, str>,
        phase: Option<Cow<'static, str>>,
        enabled: Option<bool>,
        r#fn: Option<ModifierFn>,
    },
}

impl Modifier {
    pub fn to_value(&self) -> Result<JsValue, JsValue> {
        match self {
            Self::Custom {
                name,
                phase,
                enabled,
                r#fn,
            } => {
                let m1 = js_sys::Object::new();
                js_sys::Reflect::set(&m1, &"name".into(), &JsValue::from_str(name))?;
                if let Some(phase) = phase {
                    js_sys::Reflect::set(&m1, &"phase".into(), &JsValue::from_str(phase))?;
                }
                if let Some(enabled) = enabled {
                    js_sys::Reflect::set(&m1, &"enabled".into(), &JsValue::from_bool(*enabled))?;
                }
                if let Some(r#fn) = r#fn {
                    js_sys::Reflect::set(&m1, &"fn".into(), (*r#fn.0).as_ref())?;
                }

                Ok(m1.into())
            }
            Self::Offset(options) => JsValue::from_serde(&json!({
                "name": "offset",
                "options": options.to_json(),
            }))
            .map_err(|err| JsValue::from_str(&err.to_string())),
            Self::PreventOverflow(options) => JsValue::from_serde(&json!({
                "name": "preventOverflow",
                "options": options.to_json(),
            }))
            .map_err(|err| JsValue::from_str(&err.to_string())),

            Self::SameWidth(options) => Ok(options.to_js_value()),
        }
    }
}