Files · Explorer: a folder as a list, tiles or columns, with one path and one order

FileExplorer shows the folder at the end of a path three ways: the
directory listing, a grid of tiles, or a column per folder along the
path with the next folder lit. Its name, its count and a switch of views
sit above one path bar that climbs. A folder opens in place; a file goes
to the host, which lists each folder it goes to. A pick in an earlier
column closes the columns past it, and a new deepest column scrolls into
view. The directory listing takes its pick from its owner and reports
it, so the pick carries across views; its path bar and its first order
are shared. The gallery walks a small file system and shows the tree,
the context menu, renaming in place and a drop zone in use.

src/files/mod.rs

@@ -1,10 +1,21 @@
+use std::rc::Rc;
+
+use gpui::{App, Window};
+
+use crate::lists::DirEntry;
+
+mod columns;
+mod explorer;
 mod grid;
 mod icon;
 mod item;
 
+type OnEntry = Rc<dyn Fn(&DirEntry, &mut Window, &mut App)>;
+
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
 
+pub use explorer::{FileExplorer, FileView};
 pub use grid::FileGrid;
 pub use icon::FileIcon;
 pub use item::FileItem;