49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
//! `Executable` is a property to execute a closure
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use anyhow::Result;
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use std::sync::{Arc, RwLock};
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use crate::prelude::*;
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/// `Executable` holds a closure which can be executed
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pub struct Executable<I: Send + Sync> {
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callback: RwLock<Option<Arc<dyn Fn(&mut GuiHandler, I) -> Result<()> + Send + Sync>>>,
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}
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impl<I: Send + Sync + 'static> Executable<I> {
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/// Factory method for `Executable`, returns `Arc<Executable>`
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pub fn new() -> Arc<Self> {
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Arc::new(Executable {
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callback: RwLock::new(None),
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})
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}
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/// Set callback closure
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///
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/// # Arguments
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///
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/// * `callback` is a `Option<Callback>` closure
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pub fn set_callback<F>(&self, callback: impl Into<Option<F>>)
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where
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F: Fn(&mut GuiHandler, I) -> Result<()> + Send + Sync + 'static,
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{
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let mut function = self.callback.write().unwrap();
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match callback.into() {
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Some(f) => *function = Some(Arc::new(f)),
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None => *function = None,
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}
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}
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/// Execute the callback closure if possible
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pub fn execute(&self, gui_handler: &mut GuiHandler, input: I) -> Result<()> {
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if let Some(callback) = self.callback.read().unwrap().as_ref() {
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let callback = callback.clone();
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gui_handler.add_callback(move |gui_handler| (callback)(gui_handler, input));
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}
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Ok(())
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}
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}
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