//! Module containing the definition of [`ActiveFileModel`],//! which tracks the currently focused file across an entire PaneGroup. use warpui::{Entity, ModelContext}; use super::buffer_location::LocalOrRemotePath; /// Events emitted by the ActiveFileModel.#[derive(Debug, Clone)]pub enum ActiveFileEvent {    /// A new file became focused.    ActiveFileChanged { location: LocalOrRemotePath },} /// Model that tracks the currently focused file.#[derive(Default)]pub struct ActiveFileModel {    /// The currently focused file, if any.    active_file: Option<LocalOrRemotePath>,} impl Entity for ActiveFileModel {    type Event = ActiveFileEvent;} impl ActiveFileModel {    pub fn new() -> Self {        Self::default()    }     /// Get the currently active file, if any.    pub fn active_file(&self) -> Option<&LocalOrRemotePath> {        self.active_file.as_ref()    }     /// Set the currently active file.    pub fn active_file_changed(        &mut self,        location: LocalOrRemotePath,        ctx: &mut ModelContext<Self>,    ) {        // Only emit event if the active file changed.        if self.active_file.as_ref() != Some(&location) {            self.active_file = Some(location.clone());            ctx.emit(ActiveFileEvent::ActiveFileChanged { location });            ctx.notify();        }    }}