Initial public release of Warp.

Repo-Sync-Origin: warpdotdev/warp-internal@12af1d983b

app/src/code/active_file.rs

@@ -0,0 +1,45 @@
+//! Module containing the definition of [`ActiveFileModel`],
+//! which tracks the currently focused file across an entire PaneGroup.
+
+use std::path::PathBuf;
+
+use warpui::{Entity, ModelContext};
+
+/// Events emitted by the ActiveFileModel.
+#[derive(Debug, Clone)]
+pub enum ActiveFileEvent {
+    /// A new file became focused.
+    ActiveFileChanged { file_info: PathBuf },
+}
+
+/// Model that tracks the currently focused file.
+#[derive(Default)]
+pub struct ActiveFileModel {
+    /// The currently focused file, if any.
+    active_file: Option<PathBuf>,
+}
+
+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<&PathBuf> {
+        self.active_file.as_ref()
+    }
+
+    /// Set the currently active file.
+    pub fn active_file_changed(&mut self, path: PathBuf, ctx: &mut ModelContext<Self>) {
+        // Only emit event if the active file changed.
+        if self.active_file.as_ref() != Some(&path) {
+            self.active_file = Some(path.clone());
+            ctx.emit(ActiveFileEvent::ActiveFileChanged { file_info: path });
+            ctx.notify();
+        }
+    }
+}